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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 two main types of GMAW processes?

A

Short circuiting and spray 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

What is the typical voltage range for GMAW?

A

18 to 30 volts

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10
Q

Name one advantage of using GMAW for aluminum welding.

A

Higher welding speed

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11
Q

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

A

ER308L or ER316L

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12
Q

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

A

arc

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13
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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14
Q

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

A

True

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15
Q

What is the typical wire diameter used for stainless steel in GMAW?

A

0.030 to 0.045 inches

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16
Q

Name one disadvantage of GMAW.

A

Sensitivity to wind and drafts

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17
Q

Which gas mixture is often used for aluminum GMAW?

A

Argon with 5-15% Helium

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18
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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19
Q

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

A

weld pool

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20
Q

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

A

False

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21
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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22
Q

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

A

4 to 12 inches per minute

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23
Q

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

A

spray transfer

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24
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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25
Q

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

A

True

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26
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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27
Q

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

A

Clean, beveled edges

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28
Q

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

A

weld joint

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29
Q

What is one common application of GMAW for stainless steel?

A

Fabrication of food processing equipment

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30
Q

What is the primary advantage of using GMAW over SMAW?

A

Continuous welding without stopping to change electrodes

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31
Q

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

A

True

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32
Q

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

A

It can cause porosity in the weld

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33
Q

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

A

welding current

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34
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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35
Q

Name one safety measure to take while performing GMAW.

A

Wear appropriate personal protective equipment (PPE)

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36
Q

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

A

It affects the penetration and bead shape

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37
Q

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

A

voltage

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38
Q

What is the recommended cleaning method for aluminum before GMAW?

A

Mechanical cleaning or chemical cleaning with solvents

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39
Q

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

A

True

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40
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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41
Q

What is the main concern when welding aluminum with GMAW?

A

Avoiding oxidation and contamination

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42
Q

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

A

heat-affected zone

43
Q

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

A

100 to 350 amps

44
Q

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

A

It can lead to insufficient penetration

45
Q

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

A

False

46
Q

What does GMAW stand for?

A

Gas Metal Arc Welding

47
Q

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

A

False

48
Q

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

A

Argon or a mixture of Argon and Carbon Dioxide

49
Q

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

A

welding fume

50
Q

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

A

Welding helmet, gloves, and protective clothing

51
Q

What is the purpose of a welding helmet?

A

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

52
Q

Multiple Choice: What is a common respiratory hazard when welding aluminum?

A

B) Aluminum oxide fumes

53
Q

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

A

False

54
Q

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

A

35 feet

55
Q

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

A

Class D fire extinguisher for metal fires

56
Q

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

A

grounding

57
Q

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

A

Stop welding and get fresh air immediately.

58
Q

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

A

To reduce exposure to harmful welding fumes.

59
Q

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

A

True

60
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.

61
Q

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

A

True

62
Q

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

A

power shear

63
Q

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

A

Up to 1/4 inch

64
Q

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

A

Linear motion

65
Q

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

A

Die holder

66
Q

What is a common application for sheet metal brakes?

A

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

67
Q

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

A

False

68
Q

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

A

Increased precision and automated bending processes.

69
Q

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

A

Safety goggles and gloves.

70
Q

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

A

To accurately position the sheet metal for bending.

71
Q

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

A

power shear

72
Q

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

A

10 feet

73
Q

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

A

Aluminum, steel, and stainless steel.

74
Q

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

A

True

75
Q

What does the term ‘bend allowance’ refer to?

A

The amount of material needed to allow for bending.

76
Q

What is a common feature of modern power shears?

A

Hydraulic operation for increased cutting power.

77
Q

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

A

Laser cutter or CNC shear.

78
Q

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

A

To create a bend in the sheet metal.

79
Q

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

A

tonnage

80
Q

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

A

Hydraulic drive

81
Q

Which type of shear is typically faster in operation?

A

Power shear

82
Q

What is the purpose of a shear blade?

A

To cut through sheet metal with precision.

83
Q

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

A

False

84
Q

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

A

0 to 180 degrees

85
Q

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

A

hand brake

86
Q

What is the main disadvantage of using a manual shear?

A

Limited cutting capacity and speed.

87
Q

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

A

Hybrid press brake

88
Q

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

A

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

89
Q

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

A

False

90
Q

What is the typical power source for a hydraulic shear?

A

Electric motor

91
Q

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

A

To hold the sheet metal securely in place during bending.

92
Q

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

A

blade design

93
Q

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

A

Using an adjustable stop.

94
Q

What material property is critical for bending operations?

A

Ductility

95
Q

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

A

False

96
Q

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

A

To shape the metal as it is being bent.

97
Q

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

A

CNC press brake

98
Q

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

A

laser

99
Q

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

A

Up to 10 gauge steel.

100
Q

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

A

Increased accuracy and repeatability.

101
Q

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

A

True

102
Q

What is a common feature of a modern press brake?

A

Touchscreen controls for programming.

103
Q

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

A

Regular lubrication and inspection.

104
Q

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

A

To provide the force needed for bending.

Sheet Metal 4th Year (7 decks)

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