Use Welding Equipment Flashcards
At what working pressure does free acetylene gas become dangerous and unstable?
- 1.5 psi
- 250 psi
- 150 psi
- 15 psi
15 psi
How far should an oxygen cylinder valve be opened in preparation for welding?
- halfway
- fully open
- 1 full turn
- 1 a 1-1/2 turns
Fully open
What is the pressure of a full cylinder of acetylene at 21•C ( 70•F )?
- 25 psi
- 2200 psi
- 15 psi
- 250 psi
250 Psi
What material is used to make the threaded fitting on an oxyacetylene welding outfit?
- steel
- brass
- copper
- plastic
Brass
What safety device is built into an oxygen cylinder valve to prevent excessive pressure?
- Fusible plug
- bursting disc
- needle valve
- Check valve
Bursting disc
What safety device acetylene cylinders from explosion ?
- bursting disc
- check valve
- fusible plugs
- cylinder valves
Fusible plugs
What shade of welding lens is used when using an oxyacetylene outfit?
- shade 4-5
- shade 7-8
- shade 1-2
- shade 10-11
Shades 4-5
What type of clothing should NOT be worn when working around sparks or open flames?
- leather
- cotton
- wool
- polyester
Polyester
What type of threads are used for all acetylene connection?
- left hand thread
- fine thread
- right hand thread
- pipe thread
Left hand thread
Which liquid is used an acetylene cylinder to absorb acetylene gas ?
- isopropyl alcohol
- paint reducer
- acetone
- gasoline
Acetone
How is acetylene gas produced?
- Processing natural gas
- Cooling and compressing air until it liquifies
- Smelting coke and lime in a furnace
- immersing calcium carbide in water
Immersing calcium carbide in water
How would a flame be adjustable from a carbonizing to neutral?
- oxygen needle valve
- increasing the tip size
- acetylene needle valve
- welding cylinder regulators
Oxygen needle valve
What are the two categories that gases are divided into?
- Heavy and light
- Explosive and non-explosive
- Breathable and poisonous
- active and inert
Active and inert
What Color is the outer rubber cover on an acetylene hoses?
- blue
- black
- red
- green
Red
What does the groove cut into acetylene hose connectors indicate?
- right hand thread
- left hand thread
- the material is brass
- Hand tighten only
Left hand thread
Which mandatory piece of safety equipment prevents high pressure oxygen from flowing into the lower pressure acetylene cylinder?
- diaphragm
- flashback arrest or
- double seated valve
- fusible plugs
Flashback arrestor
What mixing ratio oxygen to acetylene produces a neutral flame?
- 2 part acetylene to 3 part oxygen
- 1 part acetylene to 1 part oxygen
- 2 part acetylene to 1 part oxygen
- 1 part acetylene to 2 part oxygen
1 part acetylene to 1 part oxygen
Which part of the oxy / acetylene welding outfit is referred to as the blow pipe?
- hose
- regulator
- torch body
- cylinder valve
Torch body
Which type of flame has an excess of oxygen?
- oxidizing flame
- carbonizing flame
- neutral flame
- balance flame
Oxidizing flame
Which type of flame has feather surrounding the cone ?
- Neutral
- Oxidizing
- Balanced
- Carbonizing
Carbonizing
How are cylinder valves prepared prior to attaching regulators?
- wipe with wax & grease remover
- cracked to removed debris
- grease to prevent seizing
- wrapped with teflon tape
Cracked to remove debris
What are the typical working pressure used when setting up an oxyacetylene cutting torch?
- 30 psi acetylene - 5 psi oxygen
- 5 psi acetylene - 5 psi oxygen
- 30 psi acetylene - 30 psi oxygen
- 5 psi acetylene- 30 psi oxygen
5 psi acetylene - 30 psi oxygen
What is the main cause of a torch flashback?
- dirty welding tips
- overheated welding tips
- too little acetylene
- unequal line pressure
Unequal line pressure
What must be used to ignite an oxyacetylene torch?
- matched
- lighters
- torch
- striker
Striker
When is the oxygen lever on a cutting attachment activated
- when lighting the torch
- when the metal glows red
- after cutting to cool the tip
- when preheating the metal
When metal glows red
Which valve is closed first when shutting down an oxyacetylene torch?
- oxygen cylinder valve
- oxygen needle valve
- acetylene cylinder valve
- acetylene needle valve
Acetylene needle valve
When using a cutting tip, the flame is controlled by?
- the acetylene and oxygen valves on the cutting attachment
- the acetylene valves in the torch body and the oxygen valve on the cutting attachment
- the acetylene and oxygen valve on the torch body.
- the oxygen valve on the torch body and the acetylene valve on the cutting attachment
The acetylene valve on the torch body and the oxygen valve on the cutting attachment
All describe oxyacetylene heating EXCEPT:
- use a multi flame tip for larger parts
- use a neutral flame
- use in a slow circular motion to loosen corroded fasteners
- use temperature indicators to monitor the amount of applied heat.
Use a neutral flame.
Tech A says plasma cutting only be used on electrically conductive metals.
Tech B says plasma cutting is only used for final finish cuts
- A
- B
- Both
- Neither
A
In addition to compressed air all can be used for plasma cutting EXCEPT:
- acetylene
- oxygen
- argon
- nitrogen
Acetylene
Tech A says moisture must be filtered from compressed airs for plasma cutter use.
Tech B says particulates must be filtered from compressed air from plasma cutter use
- A
- B
- Both
- Neither
Both
Tech A says the thickest material the equipment will cut with high quality is called the “cutting thickness”
Tech B says the thickest material the equipment will cut with limited quality is called the “severance thickness”
- A
- B
- Both
- Neither
Both
At what temperature is compressed air superheated to for it to ionize?
- 330•C
- 3300•C
- 33000•C
- 330000•C
33000•C
Tech A says ionized compressed air cannot conduct electricity
Tech B says the metal is pre-heated prior to cutting
- A
- B
- Both
- Neither
Neither
All describe the plasma cutting process EXCEPT:
- Advance the torch slowly, keeping the torch directed straight downwards
- Travel speed depends on the thickness of the material
- keep the shield cup about 3-5mm ( 1/8 - 1/16” ) from the metal being cut.
- Hold the torch 45• to the surface that will be cut
Hold the torch 45• to the surface that will be cut
The purpose of “post flow” is to
- cool the metal after cutting
- cool the torch
- relieve pressure from the line
- clear contamination from the line
Cool the torch
All are considered consumable parts of plasma cutter EXCEPT:
- working clamp
- tip ( nozzle )
- electrode
- shield cup
Working clamp
Tech A says not to perform plasma cutting writhing 10 meters ( 35 feet ) of flammable materials
Tech B says plasma arc can quickly cut through gloves and skin.
- A
- B
- Both
- Neither
Both
What lens shade range is recommended when using a plasma cutter typically found in a collision shop
1 - 3
4 - 6
6 - 9
9 - 12
4 - 6
Tech A says poor connection and bare spots on cables will never cause an electrical shock because plasma arc cutters are designed with safety interlock systems
Tech B says galvanic and cadmium coating found on automotive steels can respiratory hazard
- A
- B
- Both
- Neither
B
All describe induction heating EXCEPT:
- requires an electrical ground contact.
- creates an electromagnetic field to heat up electrical conductive metal
- objects can be heated very rapidly, without the need for any external contact
- heat is generated inside the object itself, instead of by an external heat source via heat conduction.
Requires an electrical ground contact
Technician A says metal reveal moulding can remain in place when using induction heating, causing the urethane adhesive to melt
Tech B says when using induction heating to remove a windshield the glass is heated, causing the urethane adhesives to melt
- A
- B
- Both
- Neither
Neither
When using heat to remove a bonded panel the appearance of shallow dimples indicates where adhesive remains adhered.
True
False
True
Tech A says it is important ti know the vehicle manufacturers recommendation for applying heat during frame straightening procedure
Tech B says some manufacturers do not allow heating of structural panel
- A
- B
- Both
- Neither
Both
A induction heater pad attachment
- cannot harm paint finished
- is used for loosing seized nuts
- creates less intense heat by spreading heat out across the pad
- should be used to dry paint finishes
Create less intense heat by spreading heat out across the pad
Tech A says a seized nut must be heated to a red hot condition in order to free it
Tech B says a hail damage must be heated to a red hot condition to raise it
- A
- B
- Both
- Neither
Neither
How far should those with cardiac pacemakers or electronic or surgical implants stay back from induction heating equipment when in use
- at least 3 feet
- at least 10 feet
- at least 20 feet
- at least 30 feet
At least 20 feet
What welding method do manufacturers recommend for automotive high strength steel?
- Brazing
- GMAW
- SMAW
- Oxacetylene
GMAW
The correct term for welding steel is
- gas Metal arc welding ( GMAW )
- wire feed welding ( WFW )
- Metal active gas welding ( MAG )
- metal inert gas welding ( Mig )
Gas metal arc welding ( GMAW )
All describe GMA welding EXCEPT:
- uses globular transfer method
- uses short circuit arc
- duplication appearance of OEM squeeze type resistance spot welds
- Deposits molten drops 90 - 230 per second
Duplicates appearance of OEM squeeze type resistance spit welds
The primary advantage of GMA welding is that it produces a larger heat affected zone than oxyacetylene welding
True
False
False
GMA weld steel uses a mixture of inert and active shielding gasses
True
False
True
The volume of electrons, or how many electrons are moving past a point in a given period of time
Amperage
The pressure applied to an electrical circuit that forces electron to move through a conductor
Voltage
The limit of the flow of electrons
Resistance
All describe the power supply of a GMA Welder EXCEPT:
- uses short circuit transfer for steel
- converts AC to DC power
- current flow from the electrode to the workpiece
- use reverse polarity for collision repair
Current flow from the electrode to the workpiece
How long can a GMA share power after the machine is unplugged
- 5 min
- 20 min
- 2 min
- 1hr
20 min
A main consideration when selecting a welder should be
- its voltage output
- its colour
- the amp required for the metal thicknesses being welded
- that it runs a 220 volt power
The amps required for the metal thicknesses being being welded
All describe duty cycle EXCEPT
- welder will over heat if exceeded and may produce quality welds
- is listed as a fraction
- is lower if the machine is operated at higher level than the rated amperage
Is listed as a fraction
Flux core wire requires 75% argon, 25% CO2 shielding gas
True
False
False
When welding 29 gauge steel _____ wire should be used
- 0.6mm ( .023” )
- 0.8mm ( .030” )
- 0.9mm ( .035” )
0.6mm ( .023” )
All describe shielding gas EXCEPT:
- A factor in managing weld pool heat
- Uses 25% argon / 75% CO2
- stored in a high pressure cylinder
- protects the weld site from oxygen, nitrogen, and hydrogen
Uses 25% / argon / 75% CO2
Too much makes an unstable arc and increases spatter
Carbon dioxide
Used when welding aluminum
Pure argon
Adds strength
Carbon dioxide
Used when welding stainless steel
Tri - mix gas ( 90% helium / 7.5% argon / 2.5% carbon dioxide
Flow meter adjustment for collision repair welding
- 20-35 psi
- 15-30 psi
- 25-30 Cfh
- 30-35 cfh
25-30 cfh
Guides the electrode wire from the drive rolls to the contact tip
Cable liner
Protect the contact tip and direct the shielding gas to the weld area
Gas Nozzle
Completes the electrical circuit
Work Clamp
Transfers current to the electrode wire
Contact tip
Ensure proper alignment of the cable liner and evenly distribute shield gas
Gas diffuser
Pushes the wire through the cable liner
Drive roller
Which component of a GMA welding machine is NOT considered a consumable
- Gas nozzle
- cable liner
- electrode wire
- contact tip
Cable Line
All are recommended when preparing steel for welding EXCEPT:
- removing the finish
- clean with wax and grease remover
- apply weld through primer at mating surfaces
- Wash with soapy water
Wash with soapy water
All describe welding helmets and lenses EXCEPT:
- p100 filters on half mask designed to fit inside
- protect against ultraviolet and infrared radiation
- protect against concussions
- use shade rating / setting of #10-#12
Remotest against concussions
should not be 6-13mm ( 1/2” - 1/4” )
Stick out
Should not be more than 30• from perpendicular
Tavel angle
Increases penetration
Pull technique
Should be 90• for a butt joint
Work angle
How fast the technician moves the welding gun along the weld joint
Travel speed
May cause undercut if incorrect
Work angle
When using a chart on a welder determine initial welder setting the following information is required EXCEPT:
- wire type
- joint type
- shielding gas
- metal thickness
Joint type
When turning a machine it is important to use practice metal that is the same thickness as the metal to be welded
True
False
True
All describe ways to manage heat buildup EXCEPT
- continuous weld
- alternating plug weld
- skip weld
- stitch weld
Continuous weld
When welding in thicker metals with travel speed that is to slow, the arc and the heat can become concentrated on top of the weld puddle, causing poor penetration
True
False
True
Contamination or corrosion on the base metal
Spatter
Lack of shielding gas
Porosity
Uneven travel speed
Distortion
Incorrect welding gun angle
Undercut
Weld metal deposited on the top and either side of the weld bead
Overlap
Voltage and wire speed ( current ) setting to high
Cracks
All describe plug welds EXCEPT:
Should be made without removing factor zinc ( galvanic ) coating
- smaller than factory spot welds
- maxing aiming the electrode at the base and circling around the hole to fuse the edges
- typically use an 8mm ( 5/16” ) hole
Smaller than factory spot welds
When making a fillet ( Lap ) weld
- it is easiest to use the push technique and moving from the bottom to top
- the welding gun should be held at a 45• travel angle and a 70• work angle
- the welding gun should be held at a 70• travel angle and a 45• work angle
- melt through height must exceed 1.5mm ( 1/16” )
- the welding gun should be held at a 90• travel angle and a 45• work angle
The welding gun should be held at a 70• travel angle and a 45• work angle
When making a butt joint with backing weld
- the welding gun should be held at a 70• travel angle and a 70• work angle
- melt through height must exceed 1.5mm ( 1/16” )
- a root gap qual to one metal thickness is required
- the welding gun should be held at a 70• travel angle and a 90• work angle
The welding gun should be held at a 70• travel angle and a 90• work angle
All describe an open butt joint weld EXCEPT:
- more likely to distort without a root gap
- may have a root gap of 0 - 1 metal thicknesses
- common sectioning joint as it allows for easier corrosion protection
- pull or push the welding gun at a 70• travel angle while keeping the welding gun at a 70• work angle
Pull or push the welding gun at a 70• travel angle while keeping the welding gun at a 79• work angle
The factory zinc ( galvanic ) coating acts as a weld through primer, to protect the weld from corrosion and should not be removed where possible
True
False
True
Tech A says that newer vehicles protect occupants during collisions by optimizing the collision energy aborstion and collision energy transfer characteristic of the structure.
Tech B says that the passenger compartment of newer vehicles is designed to collapse and absorb collision energy
- A
- B
- Both
- Neither
A
Collision energy transfer:
- happens in the front portion of the frame rails
- occurs in the weaker parts of the vehicle
- happens when parts deform
- is achieved by making parts strong
Is achieved by making parts strong
All describe yield strength of steel EXCEPT:
- Increases with work hardening
- the minimum force necessary to form or straighten to metal
- the stress limit where plastic deformation starts
- the maximum tension load reached before the metal fractures
The maximum tension load reached before the metal fracture
All describe tensile strength of steel EXCEPT:
- listed as MPa or metatarsal’s
- increases with working hardening
- the maximum force required to achieve permanent deformation
The maximum force required to achieve permanent deformation
Compared to mild steel, HSS tend to be
- less affected by heat
- more prone to cracking
- soft
- easier to straighten
More prone to cracking
All describe the affects of heat on steel EXCEPT:
- strengths mild steel
- adds carbon back to damaged steel
- destroy UHS steels
- weakens HS steels
Adds carbon back to damaged steel
When welding on HSS and UHSS the heat affect zone
-should be as minimally necessary to make a high quality weld
- should be cooled gradually to restore is strength
- is as recommended by the vehicle maker
Should be as minimally necessary to make a high quality weld.
Heating mild steel during repairs can result in a part transferring crash energy instead of absorbing it may have been intended.
True
False
True
The practical method for identifying steel types on a vehicle during repairs is
- inspect damaged parts for cracking versus bending
- access it from service manuals or collision manuals
- to tap on components to identify higher pitch sounds from stronger steels
- perform a bench test to determine hardness
Access it from service manuals or collision manual
ER70S-6
Electro rod / tensile strength / solid / ingredients
