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Austin's Sheet Metal 4th Year > Shop & Welding > Flashcards

Shop & Welding Flashcards

1
Q

What does GMAW stand for?

A

Gas Metal Arc Welding

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2
Q

True or False: GMAW can be used for both stainless steel and aluminum.

A

True

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3
Q

What is the main shielding gas used in GMAW for stainless steel?

A

Argon or a mixture of Argon and Carbon Dioxide

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4
Q

Fill in the blank: The __________ electrode is continuously fed through the welding gun in GMAW.

A

filler

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5
Q

What are the three main types of GMAW processes?

A

Short circuit transfer
Spray transfer
Globular transfer

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6
Q

What is the purpose of the shielding gas in GMAW?

A

To protect the weld pool from contamination

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7
Q

Which type of GMAW transfer is generally used for thin materials?

A

Short circuiting transfer

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8
Q

True or False: Aluminum requires a different filler material than stainless steel in GMAW.

A

True

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9
Q

Name one advantage of using GMAW for aluminum welding.

A

Higher welding speed

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10
Q

What type of wire is commonly used as filler for stainless steel GMAW?

A

ER308L or ER316L

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11
Q

Fill in the blank: The __________ effect occurs during the GMAW process, influencing the weld bead shape.

A

arc

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12
Q

What is the role of the contact tip in GMAW?

A

To conduct the welding current to the wire electrode

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13
Q

True or False: GMAW can be performed in all positions.

A

True

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14
Q

What available range do electrode wires come in for GMAW

A

0.5mm to 3.2mm (0.020” to ⅛”)

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15
Q

Name one disadvantage of GMAW.

A

Sensitivity to wind and drafts

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16
Q

Which gas mixture is often used for aluminum GMAW?

A

Argon with 5-15% Helium

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17
Q

What is the primary benefit of using a push-pull gun for aluminum welding?

A

To feed the soft aluminum wire without kinking

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18
Q

Fill in the blank: In GMAW, the __________ is the molten pool created by the welding arc.

A

weld pool

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19
Q

True or False: GMAW is less efficient than TIG welding for stainless steel.

A

False

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20
Q

What is the main difference between GMAW and MIG welding?

A

There is no difference; MIG is a type of GMAW.

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21
Q

What is the recommended travel speed for GMAW of stainless steel?

A

4 to 12 inches per minute

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22
Q

Fill in the blank: The __________ process is ideal for welding thicker materials in GMAW.

A

spray transfer

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23
Q

What is the function of the wire feeder in GMAW?

A

To supply the filler wire to the welding arc

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24
Q

True or False: GMAW requires a clean surface for effective welding.

A

True

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25
Q

What is the effect of adding helium to the argon shielding gas for aluminum?

A

Increases heat and improves penetration

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26
Q

What type of joint preparation is typically used for stainless steel in GMAW?

A

Clean, beveled edges

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27
Q

Fill in the blank: The __________ is the area of the weld that connects the base metals.

A

weld joint

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28
Q

What is one common application of GMAW for stainless steel?

A

Fabrication of food processing equipment

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29
Q

What is the primary advantage of using GMAW over SMAW?

A

Continuous welding without stopping to change electrodes

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30
Q

True or False: GMAW can be automated for high production rates.

A

True

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31
Q

What is the impact of moisture on GMAW for stainless steel?

A

It can cause porosity in the weld

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32
Q

Fill in the blank: The __________ is adjusted to control the heat input in GMAW.

A

welding current

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33
Q

What is the purpose of using a backing bar in GMAW?

A

To support the weld pool and prevent burn-through

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34
Q

Name one safety measure to take while performing GMAW.

A

Wear appropriate personal protective equipment (PPE)

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35
Q

What is the significance of the ‘travel angle’ in GMAW?

A

It affects the penetration and bead shape

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36
Q

Fill in the blank: The __________ setting influences the arc length in GMAW.

A

voltage

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37
Q

What is the recommended cleaning method for aluminum before GMAW?

A

Mechanical cleaning or chemical cleaning with solvents

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38
Q

True or False: The electrode feed speed can affect the weld bead width.

A

True

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39
Q

What is the typical gas flow rate for shielding in GMAW?

A

15 to 30 cubic feet per hour (CFH)

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40
Q

What is the main concern when welding aluminum with GMAW?

A

Avoiding oxidation and contamination

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41
Q

Fill in the blank: The __________ is the area where the molten metal solidifies.

A

heat-affected zone

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42
Q

What is the typical range for amperage in GMAW for stainless steel?

A

100 to 350 amps

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43
Q

What happens if the welding speed is too fast in GMAW?

A

It can lead to insufficient penetration

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44
Q

True or False: GMAW is not suitable for outdoor welding applications.

A

False

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45
Q

What does GMAW stand for?

A

Gas Metal Arc Welding

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46
Q

True or False: Stainless steel is more susceptible to warping than aluminum during GMAW.

A

True

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47
Q

What type of shielding gas is commonly used for welding stainless steel?

A

Argon or a mixture of Argon and Carbon Dioxide

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48
Q

Fill in the blank: The primary hazard associated with GMAW is ________ exposure.

A

welding fume

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49
Q

Which personal protective equipment (PPE) is essential for GMAW?

A

Welding helmet, gloves, and protective clothing

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50
Q

What is the purpose of a welding helmet?

A

To protect the eyes and face from harmful UV and infrared radiation.

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51
Q

What is a common respiratory hazard when welding aluminum?

A

Aluminum oxide fumes

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52
Q

True or False: It is safe to weld in a confined space without ventilation.

A

False

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53
Q

What is the recommended minimum distance for safe operation from flammable materials?

A

35 feet

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54
Q

What type of fire extinguisher should be readily available when welding?

A

Class D fire extinguisher for metal fires

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55
Q

Fill in the blank: Proper ________ is crucial to prevent electric shock during GMAW.

A

grounding

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56
Q

What is the recommended action if you experience dizziness or nausea while welding?

A

Stop welding and get fresh air immediately.

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57
Q

What is the main reason for using a fume extractor during GMAW?

A

To reduce exposure to harmful welding fumes.

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58
Q

True or False: Welding gloves should be made of leather to provide heat resistance.

A

True

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59
Q

What is a sheet metal press brake used for?

A

A sheet metal press brake is used to bend sheet metal into desired shapes.

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60
Q

True or False: A power shear can cut through thicker sheet metal than a manual shear.

A

True

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61
Q

Fill in the blank: The main function of a _____ is to cut sheet metal.

A

power shear

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62
Q

What is the typical thickness range for sheet metal that can be processed by most power shears?

A

Up to 1/4 inch

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63
Q

What type of motion does a press brake use to bend metal?

A

Linear motion

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64
Q

Which component of a press brake holds the die in place?

A

Die holder

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65
Q

What is a common application for sheet metal brakes?

A

Creating angles, channels, and other shapes in sheet metal.

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66
Q

True or False: Sheet metal brakes can only perform bending operations.

A

False

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67
Q

What is the primary advantage of using a CNC press brake?

A

Increased precision and automated bending processes.

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68
Q

What safety equipment is essential when operating sheet metal shop equipment?

A

Safety goggles and gloves.

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69
Q

What is the purpose of a back gauge on a press brake?

A

To accurately position the sheet metal for bending.

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70
Q

Fill in the blank: A _____ is a tool used to create straight cuts in sheet metal.

A

power shear

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71
Q

What is the maximum bending length typically offered by standard press brakes?

A

10 feet

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72
Q

What type of materials can be processed with sheet metal brakes?

A

Aluminum, steel, and stainless steel.

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73
Q

True or False: The thickness of the material affects the bending radius.

A

True

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74
Q

What does the term ‘bend allowance’ refer to?

A

The amount of material needed to allow for bending.

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75
Q

What is a common feature of modern power shears?

A

Hydraulic operation for increased cutting power.

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76
Q

What does a sheet metal shop typically use to make precise cuts?

A

Laser cutter or CNC shear.

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77
Q

What is the role of a punch in a press brake?

A

To create a bend in the sheet metal.

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78
Q

Fill in the blank: The _____ of a press brake determines the maximum thickness of material that can be bent.

A

tonnage

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79
Q

What type of drive is commonly used in hydraulic press brakes?

A

Hydraulic drive

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80
Q

Which type of shear is typically faster in operation?

A

Power shear

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81
Q

What is the purpose of a shear blade?

A

To cut through sheet metal with precision.

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82
Q

True or False: Manual shears are generally more efficient than power shears for large jobs.

A

False

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83
Q

What is the typical angle range that a press brake can achieve?

A

0 to 180 degrees

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84
Q

Fill in the blank: A _____ is often used for bending smaller pieces of sheet metal.

A

hand brake

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85
Q

What is the main disadvantage of using a manual shear?

A

Limited cutting capacity and speed.

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86
Q

What type of press brake uses a combination of mechanical and hydraulic systems?

A

Hybrid press brake

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87
Q

What does the term ‘setback’ refer to in bending operations?

A

The distance from the edge of the material to the bend line.

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88
Q

True or False: Press brakes can only bend flat sheets and not other shapes.

A

False

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89
Q

What is the typical power source for a hydraulic shear?

A

Electric motor

90
Q

What is the function of a clamp in a press brake?

A

To hold the sheet metal securely in place during bending.

91
Q

Fill in the blank: The _____ of a shear influences both the cutting speed and quality.

A

blade design

92
Q

What is a common method for controlling the angle of a bend in a press brake?

A

Using an adjustable stop.

93
Q

What material property is critical for bending operations?

A

Ductility

94
Q

True or False: All power shears operate using the same cutting mechanism.

A

False

95
Q

What is the purpose of a die in a press brake?

A

To shape the metal as it is being bent.

96
Q

What type of press brake is commonly used for high-volume production?

A

CNC press brake

97
Q

Fill in the blank: A _____ shear is preferred for cutting intricate shapes in sheet metal.

A

laser

98
Q

What is the typical cutting capacity of a standard power shear?

A

Up to 10 gauge steel.

99
Q

What is the main benefit of using a CNC machine for sheet metal processing?

A

Increased accuracy and repeatability.

100
Q

True or False: The speed of a power shear can be adjusted based on the thickness of the material.

A

True

101
Q

What is a common feature of a modern press brake?

A

Touchscreen controls for programming.

102
Q

What type of maintenance is essential for sheet metal shop equipment?

A

Regular lubrication and inspection.

103
Q

What is the purpose of a hydraulic cylinder in a press brake?

A

To provide the force needed for bending.

104
Q

What are the two types of power press brakes?

A

Mechanical or hydraulic

105
Q

How are all power press brakes rated?

A

In tons

106
Q

If you are using a 120 ton brake that measures 10 feet in length, how many tons of braking power do you have per foot?

A

12 tons per foot

107
Q

What is the amount of travel of the moving beam that is adjustable on press brakes?

A

Stroke length

108
Q

What is the distance between the lower surface of the top beam and the upper surface of the bottom beam when the moveable beam is at its maximum stroke length with no dies in place?

A

Opening height

109
Q

What is the measurement from the left side to the right side of the brake tooling?

A

Overall length

110
Q

What is used in certain types of hydraulic press brakes to ensure the stopping of the ram at the same position?

A

Mechanical stops

111
Q

Name three types of bending on a power press brake

A
  • Coining
  • Bottom bending
  • Air bending

These bending types are used in various applications depending on the required precision and material properties.

112
Q

When the material is expected to take its shape from the amount of depth penetration of the punch, this is known as?

A

Air bending

Air bending is a method that uses the punch’s depth to achieve the desired angle or shape.

113
Q

Which form of bending requires the least amount of pressure?

A

Air bending

Air bending is favored for its efficiency and lower force requirements compared to other bending methods.

114
Q

What must you do to the thickness of the metal when using inside dimensions?

A

Add 20%

Adjusting the thickness is necessary to account for the bend allowance when calculating dimensions.

115
Q

To calculate outside dimensions, what do you need to do to the thickness of the metal you are working with?

A

Subtract 80%

This adjustment helps ensure accurate measurements for the final product.

116
Q

What is the name of the upper bending tool on a power brake?

A

Punch

The punch is responsible for applying force to the material during the bending process.

117
Q

What is the name of the lower bending tool on a power brake?

A

Die

The die supports the material and shapes it during the bending operation.

118
Q

What die can be used to straighten out material that has been formed incorrectly?

A

Flattening die

A flattening die is specifically designed to correct the shape of improperly formed materials.

119
Q

What are 2 disadvantages of working with rubber dies?

A
  • They deteriorate much faster
  • They have a high replacement cost

Rubber dies may not be as durable and are more expensive to replace compared to other types of dies.

120
Q

What type of die can be used if a quality finish is desired?

A

Roll form or rotator dies

Roll form or rotator dies are preferred for achieving a high-quality finish on materials.

121
Q

Which is the most accurate method of bending?

A

Coining

Coining is recognized for its precision in bending operations.

122
Q

Which method of bending produces sharp corners with consistent accuracy?

A

Bottom bending

Bottom bending is known for creating sharp corners while maintaining accuracy.

123
Q

How many times the material thickness should the die opening be when air bending material up to and including 1/2” thick?

A

8 times the material thickness

This guideline helps ensure proper bending without material failure.

124
Q

How many times the material thickness should the die opening be if you are air bending material over 1/2” thick?

A

10 times the material thickness

A larger die opening is necessary for thicker materials during air bending.

125
Q

What can be done to ensure the most accurate method to determine bend allowance?

A

Use precise calculations based on material properties and bend geometry.

Accurate bend allowance calculation is crucial for achieving desired part dimensions.

126
Q

What is the biggest disadvantage of air bending?

A

Inconsistency of the bends due to the variation of metal thickness and structure.

This can lead to variations in the final product dimensions.

127
Q

Is it acceptable to remove the guards on a power shear?

A

No.

Removing guards poses a significant safety hazard.

128
Q

What are two design types of power squaring shears?

A

Guillotine (slider) and swing beam.

These designs differ in their cutting mechanisms and applications.

129
Q

Power shears are electrically run with the motor being of what two types of systems?

A

Hydraulic or mechanical.

Each system has its advantages in terms of operation and maintenance.

130
Q

Power shears can cut from what gauge to material in excess of what?

A

From 30 gauge to in excess of 1/4 plate steel.

This range makes power shears versatile for various applications.

131
Q

Is it ok to bend material using numbers above the bolded numbers on a tonnage chart?

A

No.

Exceeding these numbers can lead to equipment damage or failure.

132
Q

What happens if the pressure is too high when using a power shear?

A

It is dangerous and will cause unsafe pressures.

Proper pressure settings are critical for safe operation.

133
Q

What is a test piece in the context of bending?

A

A sample piece used to verify the accuracy of bending operations.

Test pieces help in adjusting machinery settings for better precision.

134
Q

Guillotine type shears require a _______ to keep the blade beams in the proper position.

A

[guiding system]

135
Q

What can be adjusted on a guillotine type machine to suit the length of the part that is being cut?

A

[the rake angle]

136
Q

Good cuts cannot be expected on a strip that is smaller than how many times the material thickness?

A

[8 times]

137
Q

How are the blades kept in proper position on a swing beam style shear?

A

[A drive system pivots the moving blade down on roller bearings]

138
Q

What type of shear only uses power when it is activated?

A

[Direct drive mechanical shear]

139
Q

Mechanical shears are faster and have a better design for cutting certain types of material. To what gauge and length can they cut?

A

[To 10 gauge and 12]

140
Q

What is the flat horizontal portion in front of the shear called?

A

[the bed]

141
Q

What is used on the side of the shear that keeps the material at 90 degrees to the shear knives?

A

Side gauge

142
Q

What part on the shear is adjustable allowing you to make multiple cuts simultaneously and accurately?

A

Back gauge

143
Q

If the shear knives are not kept sharp, what can be left on the material being cut?

A

Burrs

144
Q

The piece that is mounted directly in front of the hold down fingers used to keep you from slipping your hands into the knife area is called what?

A

Knife guards

145
Q

A pedal attached by a cable or running the entire length of the shear is the?

A

Foot treadle

146
Q

What component sets up the length and materials gauge as well as adjusts the back gauge?

A

Control panel

147
Q

What is the angle made between the upper and lower shear knives?

A

Rake angle

148
Q

Is it better to have a lower rake angle?

A

True

A lower rake angle can improve cutting performance.

149
Q

What is the distance between the upper and lower shear knives called?

A

Blade clearance

Proper blade clearance is crucial for effective cutting.

150
Q

When can the guards on a power shear be removed?

A

Never, they are there for your safety!

Guards protect operators from potential injuries.

151
Q

How much residual pressure should remain in a cylinder to avoid atmospheric contamination?

A

25 psi

Maintaining residual pressure helps prevent contamination.

152
Q

Name the three basic types of metal transfer methods in GMAW welding.

A
  • Short circuit transfer
  • Globular transfer
  • Spray arc transfer

These methods affect the welding process and quality.

153
Q

What sets the arc length in welding?

A

Voltage

Voltage controls the arc length, impacting the weld quality.

154
Q

What sets the speed in welding?

A

Wire speed

Wire speed influences the heat and penetration of the weld.

155
Q

If voltage is too low and wire speed is too high, what is this referred to as?

A

Stubbing

Stubbing can lead to poor weld quality and defects.

156
Q

True or false: The cut will be of better quality with lower voltage.

A

True

Lower voltage can improve cut quality by providing a more stable arc.

157
Q

What type of welding does not require a shielding gas?

A

Flux Cored Arc Welding (FCAW)

FCAW uses a tubular wire filled with flux which provides protection from atmospheric contamination.

158
Q

What is the purpose of the shielding gas?

A

To prevent the weld metal from absorbing elements from atmospheric air

Shielding gas protects the molten weld pool from oxidation and contamination.

159
Q

What is the thermal conductivity of a gas?

A

It is the gases ability to conduct heat

Thermal conductivity is a measure of a material’s ability to transfer heat energy.

160
Q

Which gas has the higher thermal conductivity, argon or helium?

A

Helium

Helium has a higher thermal conductivity compared to argon.

161
Q

What type of gas is used to weld aluminum?

A

Argon

Argon is commonly used as a shielding gas for aluminum welding due to its inert properties.

162
Q

What is the typical flow rate for argon-oxygen shielding gas when welding steel?

A

25 CFH (cubic feet per hour)

This flow rate helps maintain a stable arc and adequate protection from contamination.

163
Q

What causes porosity in the weld metal?

A

Moisture

Moisture in the atmosphere or on the base material can lead to gas entrapment in the weld pool, causing porosity.

164
Q

What is the cheapest shielding gas available?

A

Carbon Dioxide.

165
Q

Forehanding should be used for ___
Backhanding should be used for ___

A

Forehand = butt welds
Backhand = fillet welds

166
Q

What type of shielding gas helps when welding lighter guage stainless steel?

A

Tri-Mix
( 90% helium, 7.5% argon, 2.5% CO2)

167
Q

What is the melting point of aluminum?

A

1220°F (660°C) for pure aluminum .
890°F - 1215°F (477°C to 657°C) for aluminum alloys.

168
Q

Aluminum requires a heat input ___ more rapid than mild steel to raise its temperature to melting point.

A

4 Times.

169
Q

Can you weld in all positions with GMAW on Aluminum?

A

Yes.

170
Q

Thermal Conductivity of Aluminum is ___ of copper.

A

Half that of copper.

171
Q

The aluminum oxide layer, on aluminum, must be removed before welding. This is accomplished by _______

A

Using a Flux, or by the Arc action of the GMAW or GTAW process.

172
Q

The heat of welding tends to ___ in the heat affected zone.

A

Soften the base metal

173
Q

The American Welding Society (AWS) recognizes ___ welding processes that can be used to join aluminum.

A

40 welding processes. With GMAW being among the easiest.

174
Q

For MIG welding aluminum, what angle of travel do you need to use?

A

10° - 15° with the nozzle pointed in the direction of travel.

175
Q

GMAW enables welding to be done at ____ speeds and ___ positions

A

High speeds and all positions.

176
Q

What power source is most often used for GMAW on Aluminum?

A

Constant Voltage (CV)

177
Q

Where should compressed gas cylinders be stored?

A

Outdoors or in a well ventilated area.

178
Q

Oxygen can increase what? If added in small amounts to inert shielding gasses.

A

Puddle fluidity.

(Added oxygen should be less than 10%)

179
Q

What defect is not obvious, but is very common to the GMAW process?

A

Cold lap.

(a weld defect that occurs when molten metal doesn’t completely fuse with the base metal or plate.)

180
Q

What type of clothing is preferred to be best protected from the ultraviolet radiation of GMAW?

A

Dark colored tightly woven denim clothing is preferred

The ultraviolet rays can penetrative light colored fabric, light colors are more reflective and may cause damage to your eyes even with a welding helmet on

181
Q

Electrode wires for GMAW are available in what diameters?

A

0.5mm to 3.2mm (0.020” to 1/8”)

182
Q

How are filler wires identified

A

They are identified by classification, wire and Spool size, batch number, manufacturer and any other information set out by the standard to which it is made

183
Q

How must filler wires be manufactured

A

They must be manufactured to match the base metal chemistry and mechanical properties such as tensile strength, ductility and impact strength

184
Q

What are some benefits of Flux Core Arc Welding (FCAW)?

A
  • All position capability
  • Leaves a good quality weld
  • Higher deposition rates than shielded metal arc welding (SMAW)
  • Low operator skill required
  • Metallurgical benefits that can be benefited from a Flux
185
Q

What must the welding machine be set to for Flux cored arc welding (FCAW)

A

DCEP

186
Q

Helium is a colorless, odorless, non-flammable inert gas

True or False

A

True

It is derived from the processing of natural gas, the density of helium is about 0.14 times that of air, therefore gas flow rates of two or three times that of argon are required in the flat position of helium

187
Q

Because Argon is heavier then air, it tends to concentrate in low-lying areas

True or False

A

True

If Argon gas displaces your breathing air supply, you could be asphyxiated, Always make sure you got adequate venting, especially in confined spaces

188
Q

What type of gas is Argon

A

Argon is a monatomic gas (one atom per molecule)

Argon cannot be dissolved in molten metal

189
Q

Argon is a colorless, odorless, non-flammable gas that acts as a asphyxiant

True or False

A

True

Argon is approximately 1.4 times heavier then air

190
Q

Oxygen is a colorless, odorless, oxidizing gas

True or False

A

True

Even though oxygen is a non toxic gas, high concentrations of it can affect your pulmonary and nervous system

191
Q

Hydrogen is a colorless, odorless, flammable gas that acts as a asphyxiant

True or False

A

True

It is the lightest known element and is highly combustible in air or oxygen

192
Q

Nitrogen is a colorless, odorless, non-flammable gas that acts an a asphyxiant

True or False

A

True

This gas is considered inert but will react with some elements in high temperature. Nitrogen is sometimes mixed with hydrogen to be used as a purging gas

193
Q

What does adding argon in a mixture of 1% argon to 9% oxygen do to your weld

A

The oxygen improves the puddles wetting action and reduces the tendency to undercut

194
Q

What are flow rates generally for spray transfer applications

A

Range of 11.8 liters per minute (1/min) to 18.9 liters per minute (1/min) or 25 cubic feet per hour to 40 cubic feet per hour for spray transfer

195
Q

What wire diameters are typically used for spray transfer process

A

0.030” and 0.045”

196
Q

What type of welding is used to minimize distortion when welding lighter gauge stainless steels

A

Short circuit transfer

This results in lower arc energy, which results in lower heat input in the weld

197
Q

All GMAW processes need shielding gas

True or False

A

False

198
Q

Cylinders being stored or transported must have their protective caps in place, valves closed and be stored in an upright position

True or False

A

True

199
Q

What GMAW processes is used mostly for welding lighter gauges of sheet metal

A

Short circuit transfer

200
Q

What determines the type of metal transfer method

A

The voltage used

201
Q

What is the RECOMMENDED flow setting for shield gas in cfh?

A

25 cfh

202
Q

Which gas is the lightest

Hydrogen
Argon
Helium
Oxygen

A

Hydrogen

203
Q

Argon and Helium are what type of gases

A

Inert gases

204
Q

A mixture of carbon dioxide and argon is best to eliminate spatter on mild steel

True or False

A

True

205
Q

When 1% to 5% oxygen is added to argon shield gas, it is to ____

A

Improve wetting action

206
Q

Improperly stored stainless steel wire listen often will produce welds with ______

A

Porosity

207
Q

What is the preferred gas for welding stainless steel?

A

Helium

208
Q

When you are welding austenitic stainless steel, why must you maintain the moisture content at low levels

A

Moisture can cause porosity

209
Q

What must you do because austenitic stainless steel has a very high coefficient of thermal expansion

A

You must control distortion by balancing the heat input, and you must minimize joint restraint

210
Q

When using GMAW on mild steel with carbon dioxide shielding, which type of filler wire should be selected

A

Deoxidized wire

211
Q

Which organizations have written specifications for GMAW filler metals

A

AWS (American Welding Society) and CSA (Canadian Standards Association)

212
Q

What effect does changing the wire speed have on the voltage or amperage of the welding process

A

The current varies with the amount of wire feed

The current increases in proportion to the wire speed

213
Q

Filler metals containing additional deoxidizers are intended for use on which metals?

A

Moderately rusty low-carbon steels

214
Q

Where would you use pure argon shielding gas in GMAW

A

In the welding of non ferrous materials such as aluminum, magnesium and their alloys

215
Q

What is carbon dioxide gas primarily used for

A

It is primarily used for welding of mild steel and low alloy steels

216
Q

What is a characteristic of helium used shielding gas when used with short circuiting metal transfer

A

A uniform penetrative pattern and a broader weld bead result

217
Q

What is stainless steel and aluminum gas pressure

A

Stainless steel 15-20Cfh
Aluminum 35Cfh

218
Q

What are the stick out for stainless steel and aluminum

A

Stainless steel - 3/8”
Aluminum - 1/2”-3/4”

219
Q

Wire types for aluminum and stainless steel

A

Stainless steel - 308L
Aluminum - 4043

220
Q

What is Voltage for stainless steel and aluminum

A

Stainless steel - 7-8 Volts
Aluminum - 10 Volts

221
Q

What gas is used in stainless steel and aluminum GMAW

A

Stainless steel - Helium Argon (we use Argon at SAIT)
Aluminum - Argon

Austin's Sheet Metal 4th Year (9 decks)

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