Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

Thied Year TQ REVIEW > Shop > Flashcards

Shop Flashcards

1
Q

What metals can be cut using a plasma arc ?

A

Almost all metals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What is the plasma cutting process?

A

Process that uses a high velocity jet of ionized gas delivers from a constricting orfice

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What is a computerized duct lay out program ?

A

Program linked with the plasma cutter that often has hundreds of preprogrammed basic and complex fitting shapes. Is capable of mitring reducing and dimensions as well as select seam placement. Selecting the template allows you to enter all dimensions you may require. Once you have finished u click auto nest and the computer will automatically nest the material for the least amount of wasted

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is a standard component library ?

A

Includes items such as

Lifting lugs
Belt guards
Flanges
Gussets
Can housing
Augers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Can you design your own labels ?

A

Yes you can to use later to extract critical info for estimating shipping and assembly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What are some safety practices when operating the plasma ?

A

Long sleeve
Gloves
Eye protection (dark goggles or welding mask)
Shade of 7 or 9 is acceptable

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is the nozzle in place safety feature?

A

An arc will not start unless the nozzle is in place

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is another consideration when purchasing a plasma ?

A

Look for machine that provides pre flow sequences

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

What are the 5 components of the plasma ?

A

Shield
Retains cap
Nozzle
Electrode
Swirl ring

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What are the consumables on a plasma machine ?

A

Electrode
Nozzle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

What guidelines should you follow when selecting a machine

A

Determine metal thickness
Select best cutting speed
Look for portability factor
Determine durability

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

If you cut thick metal what amperage machine should you get ?

A

A high amperage machine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What is the cutting speed measured in ?

A

Inches per minute

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is kerf ?

A

The void created by plasma cutting process or the amount of metal removed by the plasma

Changes due to every factor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is kerf angle ?

A

Kerf width and bevel angle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

How are nozzles sized for plasma ?

A

According to amperage rateing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What if kerf angle is too wide ?

A

Meaning that the part is to small it can be caused by

Worn nozzle
High torch standoff
Excessive amperage
Inadequate gas flow or low speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What if kerf angle is too narrow ?

A

Low torch standoff
Excessive gas flow or high speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is a bevel angle ?

A

The angle of the cut edge.

A cut with zero degree bevel is a straight cut

Typically bevel angles range from 1-3 on the good side of the cut and 3-8 on the bad side

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

What would cause a positive and negative and irregular bevel ?

A

Positive = high torch standoff Excessive off worn nozzle excessive speed

Negative= caused by low torch standoff excessive amperage or low speed

Irregular = means the nozzle has failed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

What is dross ?

A

Molten metal that had hardened before it was ejected from the cut

Slag/ bur

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

What happens when the chromium content exceeds 11% on stainless steel?

A

An invisable film is formed and protects the material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Can stainless steel rust and if so how ?

A

Yes when the film is contaminated by iron

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

What elements can be in stainless steel ?

A

Chromium
Nickle
Manganese
Molybdenum
Carbon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

What are 4 groups of stainless steel ?

A

Austenitic
Feeritic
Duplex
Martensitic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

What is duplex steel ?

A

Combination of austenitic and ferritic alloy, either 300 or 400 series contain a high chromium content also known as as ferritic and austenitic alloy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

How many groups and series are the for stainless steel ?

A

4 groups and 2 series

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

What is ferritic steel ?

A

Magnetic steel or 400 series stainless steel which chromium content of 11-18%. It contains no nickle and is used for automobile trim exhaust hot water tanks

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

What is austenitic steel ?

A

Non magnetic or 300 series that has a chromium content of 16-25% and a nickle content of 6-22% most common type of stainless used in sheet metal trade

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

What is martensitic steel ?

A

Magnetic steel or 400 series that has chromium content of 12-18% and high carbon content. Used in surgical instruments spindles pins

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

What are some advantages of stainless steel ?

A

Hugh resistance to corrosion
Can take a high polish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

What are some disadvantages of stainless steel?

A

Cost
Workability
Labour required

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

What are the most common stainless steel types ?

A

304 and 316

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

How is stainless steel listed ?

A

Chromium is listed first and nickle is listed second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

What is mill rolled 2b?

A

Produced the same as 2d however it is passed through a polished roll to provide a more reflective finish

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

What is mill polished 4 ? And what grit do we use ?

A

Widely used for resturant equitment kitchen equitment and has a grit that is hard to reproduce

Grit used 100-150

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

What is mill polished number 8? What grit do u use ?

A

Grit line free surface achieved by extensively buffing. Most produced finish like a mirror

320 grit

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

What must be done when working with stainless steel?

A

Sweats the equitment by 2 working gauges or 4 gauges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

Should you use a debuting tool on stainless steel ?

A

Yes when stainless steel is cut it leaves a burr which makes fit up and welding harder

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

How many teeth should be in contact with the material for cutting stainless with saw ?

A

Atleast 2 teeth should always be in contact

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

What should the included angle of a drill bit be when working with stainless steel ?

A

130 to 140 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

Whst should be done when punching stainless steel ?

A

Twice the amount of force is required compared to mild steel therefore speed of travel should be reduced by 50%

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

Is band sawing a good choice for stainless steel?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

What is the purpose of the squaring shear ?

A

Must be derated 4 gauges and most shops that do excessive steel install hardened blades. The blade clearance should be reduced to the manufacturer specified a recommended gap for lighter stainless is 0.001 to 0.0015 and for heavier it should be 0.0015 to 0.002

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

What is spring back ?

A

The elasticity of the material when bending you must over bend to accommodate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

What are two ways to bend stainless steel ?

A

Air bending and coining

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

What is the correct bend radius setting for a brake with stainless steel?

A

1 metal thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

What is a power brake ?

A

Will require more pressure to complete a bend and Thier capacity will decrease. Air bending and bottom bending are both acceptable methods

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

Does bottom bending scratch the surface ?

A

Although bottom bending is more consistent it leaves scratches and scars

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

What 2 advantages does air bending have ?

A

Less pressure required to complete bend
Fewer scars and scratches

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

Can you use bench machines with stainless steel ?

A

Most are limited to light gauge materials use extreme caution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

What methods can be used to fasten stainless ?

A

Rivets bolts nails soldering Lloyd’s flux soft soldering hard soldering brazing welding and spot welding. SMAW also know as stick welding. GTAW also know as tig welding and MIG

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

What must be done if spot welding stainless ?

A

Increases pressure and lower appearance and current flow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

How much should u be able to bend a spot weld ?

A

60 to 90

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

What type of current should be used when welding stainless steel ?

A

DCEN also know as straight polarity. When deep penetration is needed you can use reverse polarity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

What can be used for distortion control when welding stainless ?

A

Copper chill plate sand aluminum backing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

What is the heat expansion properties of stainless steel?

A

50%greater than mild steel while having a third as great heat conductivity of mild steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

What type of welding should be used when welding stainless ?

A

skip welding
Stich welding which consists of makeing a short weld then skipping

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

What is stepback welding ?

A

Each bead is welded into the cooled end of the previous weld

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

What is the finishing procedure of stainless steel?

A

Grinding
Sanding
Polishing
Buffing

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

When punching stainless steel what should the minimum hole diameter be ?

A

Should be at least twice the material thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

What are some potential pitfalls of welding stainless steel?

A

Mixing carbon steel and stainless steel welding consumables
Grinding welds with disc that was previously used on carbon or galvanized steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

What happens with a power brake ?

A

Requires more force also know as tonnage therefore capacities decrease

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

When using bottoming or 90 v dies to bend angles what happens ?

A

Less pressure is required to complete bend fewer scars and scratches and acute angles can be bent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

What should be placed on the bottom die’s to prevent contamination?

A

Protective cover
Neoprene, PE, rubber dies can be used to help form various angles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

What should the opening of your bottom die’s be ?

A

Atleast 8 times the material thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

Is weldability high for martensitic and ferritic metals ?

A

Usally low for both

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

What joint is not recommends for use on stainless steel and why ?

A

Lap joint
Retains food

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

What should the tungsten protrude for each type of weld ?

A

1/4” maximum for fillet welds
3/16” maximum for butt welds
1/8” maximum for outside corner welds

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

What type of tungsten should be used on stainless steel ?

A

1/16” 1% yellow thoriated or 2% red theoriated, pure

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

What should the flow meter be set to ?

A

A general rule is 20cfh for sheet metal projects

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

Should the filler rod match your base metal ?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

Does stainless steel have a low thermal conductivity?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

Can grain grow that occurs during welding ferritic stainless be corrected ?

A

No

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

What is the reasonable tip size for spot welds ?

A

1/8” plus 2 metal thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

What angle should you hold the angle grinder at ?

A

10 degrees to the metal surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

When close tolerances are required what should be done ?

A

Use a cross grinding technique

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

What else can be used besides grinders to grind and clean welds ?

A

Die grinders
Belt sanders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

What is pickiling ?

A

Uses an acid or mixture of acids to remove scale product in hot Tempature settings

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

What is passivation ?

A

A process used to remove any free iron from stainless steel. Uses nitric acid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

What is degreasing ?

A

Removing grease from the surface of the stainless steel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

Why is it not recommended to soft solder stainless steels together ?

A

Joints may be weak

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

How should full sized stainless steel sheets be stored prior to fab ?

A

Upright

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

What should be done before you bend any peices of stainless steel after shearing ?

A

Deburr all edges

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

In which series do austenitic steels belong to ?

A

300 series

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

When tig welding aluminum what is the first key step for proper welding technique ?

A

Puddle control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

What 2 ways can you cut aluminum?

A

By hand or by using Beverly shear

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

What does harmonica sound from a bandsaw mean ?

A

Blade tension is too low or the distance between other blade guides is too wide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

What does Hugh pitched squealing mean ?

A

Warns of problems with chip formation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

When breaking and forming heavy gauge alluminum what works best?

A

A press brake

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

How far does the supper jaw need to move back ?

A

Atleast 3 metal thickness to prevent the brake from pinching the material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

When forming soft material what should be done ?

A

You are better off to make a series of soft brakes rather then a single heavy brake space light kinks 1/8”

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
93
Q

What is the recommended female bottum die opening for 1/2” and over 1/2”?

A

Anything up to 1/2” should be 8 times the material thickness while anything over should be 10 time material thickness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
94
Q

When welding aluminum what type of current do we use ?

A

Ac

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
95
Q

When welding aluminum what are the best tungsten choices ?

A

3/32” diameter with 2% cerium or 2% thorium, ewp-green also known as pure, ewz- brown ewc-orange

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
96
Q

What Tempature does the oxide layer for aluminum melt at ?

A

3200 while aluminum melts at 1200

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
97
Q

Should you use a balled end electrode for aluminum ?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
98
Q

What are 3 functions of high frequency current ?

A

Arc stabilization-recognition of positive half of ac

Arc initiation- initation is the non touch start

Gas ionization - aids in starting and promoting the cleaning action of the surface oxide

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
99
Q

How does a flow meter read ?

A

Cubic feet per hour or liters per minute

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
100
Q

How should you grind your tungsten’s ?

A

Longitudinal

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
101
Q

What should I’m the inside diameter of the gas cup be ?

A

Atleast 3 times the tungsten diameter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
102
Q

What amperage can an air cooled torch go to ?

A

200 amps

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
103
Q

Can water cooled torches go higher than air cooled ?

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
104
Q

What is the proper torch angle ?

A

15 to 20 degrees

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
105
Q

When tig welding what method should be used ?

A

Push

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
106
Q

What does aluminum act as ?

A

A heat sink

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
107
Q

What is the most common type of inadequate gas flow ?

A

Tungsten is immediately consumed and is deposited into weld puddle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
108
Q

What does work like and the half plan for round openings represent ?

A

Partial plan view shows the exact send distance that the element line moves when viewed from the top

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
109
Q

Why is it better to make proper round template before starting to brake form an aluminum square to round ?

A

Shakeong is easier to control which makes taking it up easier

110
Q

When welding 1/8” aluminum what type of tungsten should be used ?

A

EWZ-white

111
Q

When developing a centered one way square to round what is the minimum plan view required ?

A

Half pattern while an on center would only need quarter plan

112
Q

How far should your half plan view be drawn from the edge of the material ?

A

At least 1inch

113
Q

How should you label the plan view ?

A

Label rectangular openings begins with top seam as a and continue to label each point clockwise ending with d

Label round opening 1-7 clockwise

114
Q

Do you need a diagram of true lengths ?

A

Yes

115
Q

How do you tell if a square to round is an outside or inside pattern ?

A

If the pattern goes abcd its inside of its dcba it is outside

116
Q

For an elbow seam to pass over a groove seam how far do you need to notch ?

A

1 and 1/2” times the groove seam

117
Q

What is formula for collar stretch out ?

A

Pie(d)+seam allowance

118
Q

What is the allowance for an elbow seam ?

A

1/8”

119
Q

What are diffrent ways for forming a square to round?

A

A blow horn
Brake
Power brake

120
Q

When a grooved seam is complete how many metal thickness are there ?

A

4

121
Q

Before completing the grove seam you should what ?

A

Use your hand grooved and riveting hammer to lock both ends of the seam partially

122
Q

To form an elbow seam what machine should be used ?

A

The rotary elbow machine

123
Q

When should you use more than 12 element points to layout triangulated pattern ?

A

For diameters over 12”

124
Q

When folding allowances for a grooved seam you should what ?

A

Fold slightly less than the nominal size

125
Q

What is allowance for small end ?

A

7mt

126
Q

What name is the most commonly given to gas tungsten welding ?

A

TIG

127
Q

Describe the welding process for gas tungsten arc welding ?

A

Fusion welding is accomplished by the heat of an electric arc drawn between a non consumable tungsten electrode and the work

128
Q

Is gtaw more hazardous than any other welding procedure?

A

No

129
Q

Is gtaw more hazardous than any other welding procedure?

A

No

130
Q

What four main safety precautions should be taken in respect to prior and during the gtaw?

A

Electrical hazards
Eye protection
Protective clothing
Ventalation

131
Q

What should be checked prior to welding proven electrical shock ?

A

Check all connections to ensure they are properly made to avoid the possibilynof electrical shocks

132
Q

Mild steel has a 50% larger expansion rate compared to stainless steel?

A

False

133
Q

Which procedure is quickest to weld stainless steel ?

A

GMAW

134
Q

How often should we check all current carrying components required for gtaw ?

A

Regularly

135
Q

How often should we check all current carrying components required for gtaw ?

A

Regularly

136
Q

What must be in place prior to welding ?

A

All protective covers must be in place

137
Q

Does the welding machine have to be grounded ?

A

Yes

138
Q

What should be done to all electrical connections and insulation on the electrode holder and handle ?

A

Ensure all electrical connections and insulation on the electrode holder (torch) handles and cables are in good condition

139
Q

How do we know what size torch (electrode holder) needs to be used ?

A

Must be large enough to handle smoking of current used without overheating

140
Q

What should be checked for on a water cooled torch head ?

A

Check all connections for leaks

141
Q

List 3 things required of the work leads prior to using them for the welding process ?

A

Good conditioned
Large enough to handle current
Firmly connected to the work to prevent accidental arcing

142
Q

3 saftey items that must be considered regarding hoses or cables in the work space when welding ?

A

Protected from hot materials or falling objects

Hung up and out of way when not in use

Leave work area clear of obstacles and possible tripping hazzourds

143
Q

Why should you turn the power off to the welder when not in use ?

A

To prevent accidental arcing

144
Q

Why is it important to have dry gloves and footwear when welding ?

A

Perspiration can cause gloves to become conductors.

145
Q

What needs to be done if you are welding in wet weather conditions or are standing on a wet surface ?

A

Take the necessary precautions to protect

146
Q

In what scenario is the most intense ultraviolet radiant energy produced ?

A

When argon shielding is used and when aluminum or stainless steel is being welded

147
Q

What shade of welding lens is required for welding?

A

Use the darkest shade that’s comfortable but not lighter than what is recomeneded

148
Q

What should other people present in the welding area have on for eye protection ?

A

Wear no. 2 shade flash glasses or goggles

149
Q

What can happen to exposed skin that is not covered during the welding process?

A

Shinny surfaces can cause a sunburn effect to exposed skin

150
Q

When working inside a tank or confined space what should you be careful to also protect from bright light ?

A

Back of kneck and ears

151
Q

When should we be using ear protection when welding ?

A

When welding in area with high noise levels

152
Q

Outlines acceptable noise levels in a working environment ?

A

Provincial occupational health and safety standards

153
Q

What type and color of clothing is preferred when welding ?

A

Dark coloured tightly woven clothing is preferred

154
Q

What can be the result of wearing a light color of clothing that can reflect light when welding ?

A

More reflective and may cause burns to eyes even when a helmet is worn

155
Q

Why should synthetic clothing be avoided when welding ?

A

Tend to flash (burn rapidly )

156
Q

What are two considerations that must be met when selecting clothing used for welding ?

A

Relatively flame resistant
Free of any oil or grease

157
Q

Why is it important to keep you collar buttoned and your pockets and cuffs covered when welding ?

A

Prevent the entry of sparks

158
Q

What should never be in pockets when welding ?

A

Matches
Lighters

159
Q

What type of glove is required for GTAW welding?

A

Gauntlet gloves of an approved type to protect your wrist and lower arms

160
Q

Why must we take caution over useing a TIG type welding glove opposed to a general purpose type welding glove ?

A

Don’t offer the same level of protection

161
Q

What must a welder have readily available for fire prevention ?

A

Suitable fire extinguisher

162
Q

What type of material should be removed or protected when welding in a specific area ?

A

Any flammable materials

163
Q

What are four reason it’s mandatory to have local ventilation when TIG welding

A

Metals that have paint plating or other materials on surface near weld zone produce toxic fumes when heated

Argon or helium displaces air resulting in a deficiency of oxygen that could cause asphyxiation

GTAW produces much higher levels of light than SMAW processes. Oxygen and ultraviolet light produce toxic ozone gas

Welding on some metals can produce posinous gases

164
Q

Why must we use extreme caution when welding metals containing zinc, cadmium, lead and beryllium ?

A

Fumes from these metals can be toxic

165
Q

Why is it important to have the exhaust ventilation serval inches away from the welding area ?

A

So the ventilation does not disturb the gas shield

166
Q

What is the maximum feet per minute that should be maintained over the surface of the welding area ?

A

50fpm

167
Q

Why do certain cylinders and regulators have diffrent sizes and types of connections ?

A

Eliminate the possibility of interchanging regulators to cylinders

168
Q

Why is it important on how we store liquid and gas cylinders ?

A

Prevent incorrect use of gasses

169
Q

What 2 important pieces of information must be attached to every cylinder containing liquids or gases used for welding ?

A

Identify the gas it is
Whimis symbol attached

170
Q

Where are two locations that we can store gas and liquid cylinders ?

A

Outdoors or in well vented area

171
Q

How should gas and liquid cylinders be secured when storing transporting or being used for welding ?

A

Vertical upright position

172
Q

What 3 things need to be done to gas and liquid cylinders prior to returning them ?

A

Ensure valves are closed
Protective caps in place
Outlet cap or plugs replaced

173
Q

What 4 things are protected from atmospheric contamination by the gaseous shield in tig welding ?

A

Elected
Arc
Puddle
Adjacent heated area of the work peice

174
Q

Do we always need to use filler rod when tig welding ?

A

No

175
Q

Why was tog welding originally developed ?

A

To weld corrosion resistant and hard to weld materials such as aluminum and magnesium

176
Q

What delivers the heat between the electrode and the work peice ?

A

The arc

177
Q

Where would u add filler rod when tig welding?

A

To the puddle

178
Q

How is filler rod inserted into the welding metals containing puddle when heated ?

A

It’s added separately either manually or automatically

179
Q

What 10 metals can be welded by tig welding

A

Aluminum
Magnesium
Stainless
Carbon steel
Titanium
Copper
Copper alloys
Nickle
Nickle alloys
Low alloy steels

180
Q

When would tig welding be the preferred welding process ?

A

When highest possible welds are required for the more critical weld applications

181
Q

Some advantages of tig welding?

A

Ability to weld most metals
High quality welds
Heat source and filler metal can be controlled separately

No weld splatter
Don’t always need fill metal

182
Q

What are some disadvantages of tig welding?

A

Slow
Time consuming so increased cost
Expensive gas shielding
The gas used has asphyxiation hazzard
Can’t be done outside because of gas shielding

183
Q

List four types of GTAW power sources ?

A

Transformers
Transformer/rectifiers
Generators
Inverter type

184
Q

Which gtaw power source is best suited and most commonly used in our industry ?

A

Transformer / rectifiers designed for gtaw

185
Q

Which type of current is used for welding aluminum and magnesium ?

A

Alternating current

186
Q

Which type of current is generally used for welding ferrous metal and some non ferrous metals ?

A

Direct current straight polarity

187
Q

What can be used on specific gtaw workstations to control gas flow cooling media and current ?

A

Remote control units

188
Q

When using a remote foot control on gtaw workstations what restricts the maximum amount of current that will be delivered to the work peice ?

A

Amperage adjustment control

189
Q

What 3 things are controlled by the remote control unit attached to the torch handle ?

A

Main conductor
Shielding gas flow
Amperage

190
Q

Whst are two methods of cooling the torch on a gtaw unit?

A

Air cooled
Water cooled

191
Q

What is the difference between the power cable thickness on an air cooled torch assembly compared to a water cooled torch assembly ?

A

Power cable on air cooled torch is heavier than that used in the water cooled torch assembly

192
Q

Why is the one torch power cables thicker than the others ?

A

Water cooled torch assembly can maintain cooler temps

193
Q

What is the maximum amount of amperage that is recommended to be ran through the power cables of an air cooled torch head assembly ?

A

200amps

194
Q

In regards to the electrode what is the advantage of using a water cooled torch head assembly opposed to an air cooled torch head assembly ?

A

Lower electrode Tempature and less electrode erosion

195
Q

Can the water cooled torch head carry more or less amperage in comparison to the air cooled torch assembly ?

A

More

196
Q

What are the advantages of having a flexiabke torch head assembly ?

A

Allows u to adjust the head angle for your comfort and better joint access

197
Q

What is the most common torch head angle used in GTAW ?

A

120 degrees

198
Q

List the components of the torch head?

A

Collet, collet body , torch cap , electrode , gas nozzle

199
Q

What are 3 functions of the torch cap ?

A

Prevent accidental arcing of the tungsten electrode at the back of the torch

Used to tighten the collet onto the electrode

Give a positive shielding gas seal between the torch cap and the body

200
Q

What are 5 components that make up an air cooled and or water cooled torch body ?

A

Handle
Means of conveying shielding gas seal between
Collet body connections
Metal body to transfer power from cable to collet body
Cooling lines (water cooled type)

201
Q

What three things are normally included in the torch body ?

A

Cables
Hoses
Machine connectors

202
Q

What are three functions of the collet body ?

A

Holds the electrode collet to position the electrode in the torch

Establishes electrical contact between torch body and electrode collet

Directs shielding gas to the gas nozzle

203
Q

In regards to the electrode what are two functions of the collet ?

A

Positioning electrode
Makeing positive electrode contact

204
Q

What transfers the electrical current from the collet body to the electrode ?

A

The collet

205
Q

How is the tapered end of collet pushed into the collet body resulting in tightening around the electrode ?

A

By tighting the back cap

206
Q

What are most collets made from ?

A

Copper alloy

207
Q

What is the result of using mismatched collet bodies and collets ?

A

Damage to the collet occurs and the electrode cannot be held in position

208
Q

What is the function of the gas nozzle ?

A

Direct shielding gas into the weld zone

209
Q

What type of nozzle is the most common and why ?

A

Ceramic type because it’s the least costly

210
Q

What is a major disadvantage of using a ceramic type nozzle ?

A

They become brittle after repeated use and cause chipping and uneven gas flow

211
Q

What are 2 considerations which must be taken into account when selecting a gas nozzle ?

A

Size of electrode
Size of puddle

212
Q

What are four advantages of using a smaller nozzle ?

A

Maintain a more stable arc
Give the welder better vision
Give a compression effect to the arc permit welding in restricted areas

213
Q

What is the main advantage of using a larger nozzle ?

A

Give a better shielding action at lower gas flow rates

214
Q

What metals are normally welded using a larger nozzle ?

A

Metals that oxidize readily at elevated temperatures

215
Q

List 3 other types of nozzles available but are not commonly used in the sheet metal industry ?

A

Alumina gas nozzle
Fused quartz nozzles
Sleeve type metal nozzles of the slip on style

216
Q

What can result in not keeping the nozzle clean ?

A

Build up resulting in turbulence in the gas flow and contamination of the weld puddle if build up falls in weld pool

217
Q

What is the result of using a gas lens inside a nozzle ?

A

Produce a longer undisturbed plume of gas

218
Q

What is meant by gas flowing in a laminar fashion?

A

Arranged in thin layers

219
Q

By using a gas lens will the distance between the work and nozzle increase or decrease ?

A

Increase nozzle to work distances

220
Q

What can cause a gas lens to disrupt gas flow?

A

Fine spatter or other contaminants

221
Q

What is crucial for f the use of a work lead ?

A

Clean contact surfaces and make good electrical contact with the work peice

222
Q

What defines an electrode ?

A

Picks up or emits electrons in a electrical circuit

223
Q

Which type of electrode is used in the GTAW process?

A

A non-consumable tungsten electrode

224
Q

What is the purpose of an electrode(tungsten) when used in the gtaw process?

A

Transfer electrical current across the arc between the tungsten and the work

225
Q

Why is the tungsten used as an electrode in gtaw process ?

A

High refractory metal with melting point of 3410 degrees Celsius and 6170 degrees Fahrenheit which is the highest melting point of all metals

226
Q

How are the size of tungsten’s expressed?

A

Diameter and length

227
Q

How has the American welding society developed a system to quickly identify the diffrent alloyed tungsten used for gtaw ?

A

Numbering and a color code system to identify each electrode

228
Q

What would u use to help heat distortion when welding ?

A

Cooper chill plates

229
Q

What type of file is a CAD file for the plasma table ?

A

DXF

230
Q

What two types of finishes are electrodes manufactured in?

A

Ground
Chemically cleaned

231
Q

What are two factors that can affect current ranges ?

A

Material type
Thickness

232
Q

What’s the main purpose of a shielding gas ?

A

Exclude the atmosphere from the weld puddle

233
Q

What is the result of atmospheric air entering the molten metal ?

A

Porosity, gardening and embrittlement in the weld

234
Q

List 3 gasses that are normally used in gtaw process ?

A

Argon
Helium
Argon-helium

235
Q

Is argon heavier or lighter than air ?

A

Argon is 1.4 times as heavy as air

236
Q

What could be the result in argon replacing oxygen in the work area?

A

You could be asphyxiated

237
Q

List 3 applications where helium would be used for gtaw welding ?

A

Heavier sections
Higher thermal conductive metals
Automatic high production welding

238
Q

What is the percentage of argon and helium in a mixed gas used for gtaw ?

A

80%argon
20%hellium

239
Q

Where would an argon helium mixture be a good choice for shielding gas ?

A

Stainless steel and non ferrous metals Automatic high

240
Q

What is the main disadvantage of using an argon helium mixture ?

A

Cost

241
Q

What are two ways that shielding gasses are stored in ?

A

High pressure cylinder
Bulk liquid systems

242
Q

How open should gas cylinders valves be when in use ?

A

Valves should be opened fully

243
Q

3 main functions of a gas regulator ?

A

Reduce source pressure to working pressure

Maintain a constant delivery pressure regardless of variations at the source end

Deliver gas at any desired pressure within its rated capacity

244
Q

What two ranges are regulators designed to work within ?

A

Pressures
Volumes

245
Q

What do regulators control ?

A

Pressure not flow rates

246
Q

What regulates the flow rate of a shielding gas ?

A

20 flow meters

247
Q

How are flow meters calibrated to indicate ?

A

Liters per minute or cubic feet per hour

248
Q

Elegant is the difference between a regulator and flowmeter in terms of what they indicate ?

A

Flowmeter indicate volume flow

Regulators indicate pressure

249
Q

Why are flow meters designed and calibrated for specific gasses ?

A

Because Thier densities are diffrent

250
Q

On a combination regulator/flowmeter why is the regulator pre set to a specific pressure ?

A

So that it is compatible with the flowmeter

251
Q

Why are gauges on a gauge style combination regulator / flowmeter not as accurate as a flow tube style flow meter ?

A

Because they operate on pressure converted into volume

252
Q

What type of hose should be used for transferring shielding gasses?

A

Hide designed for transferring shielding gases

253
Q

Why are plastic hoses used for helium shielding gas opposed to rubber hoses ?

A

Rubber will allow helium pressurized to above 138kpa (20psi) to penetrate through the hose and cause gas loss

254
Q

What does the solenoid valve control ?

A

Shielding gas and coolant flow

255
Q

Four ways filler materials can be available for gtaw welding ?

A

Straight rod
Flattened rods
Spooled wire
Consumable inserts

256
Q

What is the range of diameters that filler rod used for tig can be ordered ?

A

1.6mm to 6.4mm

(1/16” to 1/4”)

257
Q

How are diffrent filler rods identified ?

A

Attached tag or stamped impression

258
Q

What must the filler rod match in relation to the base metal being welded ?

A

Match or exceed the base metal properties

259
Q

In carbon steel what does the E R 70 S 2 represent in ER70S-2

A

E=electrode
R= rod
70=minimum tensile strength in pounds per square inch
S= solid wire
2= manufactured chemical analysis

260
Q

In stainless steel ER347 what does the E R 347 mean ?

A

E =elctrode
R=rod Flattened rods
347= grade of stainless

261
Q

Under normal circumstances die’s filler rod require any specific prep prooor to welding?

A

No

262
Q

Where should the hot end of filler rod be located during welding ?

A

Protected by the inert shielding gas during the welding to reduce atmospheric contamination

263
Q

Where should filler rod be stored when not being used ?

A

Remain in they’re containers until required for service

264
Q

What is amperage ?

A

Measure of the number of electrons

265
Q

What is voltage ?

A

The pressure needed to push the amperage

266
Q

What are the 2 methods of preparing electrodes ?

A

Grinding
Electrical arc

267
Q

What does a concave area in the weld mean ?

A

Sugaring effect (to hot)

268
Q

What is the cause of incomplete penetration when welding ?

A

Arc length to low
Current setting to low

269
Q

What causes a lack of fusion ?

A

Arc to long
Current setting to low
Incorrect fit up and prep

270
Q

What is the cause of porosity with in the weld bead ?

A

Inadequate gas shielding
Air drafts
Dirty materials
Moisture
Contamination

271
Q

What does excessive gas flow create ?

A

Venturi effect (increase in velocity decrease in pressure )

Thied Year TQ REVIEW (6 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions