Brainscape's Knowledge GenomeTM

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


See full index

Film Appreciation > GMAW/FCAW Final > Flashcards

GMAW/FCAW Final Flashcards

1
Q

Gas Metal Arc Welding

GMAW-S
Short Circuiting Transfer

A

encompasses the lowest range of welding currents and electrode diameters associated with the GMAW process. This process produces a fast freezing weld pool that is generally suited for joining thin sections, out-of- position welding, or root passes

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

Gas Metal Arc Welding

GMAW-MSC
Modified Short Circuit

A

has several proprietary derivatives of the short-circuiting transfer mode which use a modified waveform to reduce some of the problems found with short- circuiting—mainly, spatter and a turbulent weld pool. Typically these systems sense the progression of the short circuit as it happens and modulates the current to limit the amount of force behind spatter and turbulence-producing events.

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

Gas Metal Arc Welding

GMAW-MSC (Modified Short Circuit)

Power Supply:

A

power sources are software-driven to maintain optimum arc characteristics by closely monitoring and controlling the electrode current during all phases of the short-circuit.

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

What’s the primary purpose of shielding gas?

A

Prevents the molten weld metal from absorbing elements from atmospheric air such as oxygen and nitrogen

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

What is the lightest gas?

A

Hydrogen

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

Metal transfer

A

The manner in which molten metal transfers from the end of the electrode across the welding arc to the weld pool.

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

pulsed spray transfer (GMAW-P)

A

A variation of spray transfer in which current is pulsed from a low background level to a peak level above the spray transfer transition current.

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

contact tip-to-work distance (CTWD)

A

The distance from the end of the contact tip to the work and includes arc length.

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

short circuiting transfer (GMAW-S)

A

A metal transfer mode in which molten metal from consumable welding wire is deposited during repeated short circuits.

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

Electrode extension

A

The distance from the contact tip to the end of the welding wire.

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

Globular transfer

A

The transfer of molten metal in large droplets from a welding wire across an arc to a workpiece.

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

Spray transfer

A

A metal transfer mode in which molten welding wire is propelled axially across an arc.

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

Burn back

A

A condition that occurs when welding wire is restricted and fuses to the end of a contact tip.

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

gas metal arc welding (GMAW)

A

An arc welding process that produces an arc between a continuous wire electrode and a workpiece, creating a weld pool in the presence of a shielding gas.

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

Intermediate weld pass

A

A single progression of welding subsequent to the root pass and before the cover pass.

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

Washing

A

A process of removing metal from large areas, such as the removal of surfacing metal, backing material, or riser pads on castings.

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

Arc plasma

A

A gas that is superheated to an ionized condition, enabling it to conduct an electric current.

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

Kerf

A

The gap produced by a cutting process.

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

air carbon arc cutting (CAC-A)

A

A group of cutting processes that use heat generated by an oxyfuel gas flame.

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

Gouging

A

A cutting process that removes metal by melting or burning the entire removed portion to form a bevel or groove.

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

plasma arc cutting (PAC)

A

A cutting process that uses a constricted arc to remove molten metal with a high-velocity jet of arc plasma (ionized gas) issued from a constricting orifice.

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

Viscosity

A

The resistance of a substance to flow in a fluid or semifluid state.

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

Ultrasonic welding (USW)

A

A welding process that produces a weld by applying high-frequency vibratory energy to workpieces that are held together under pressure.

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

Background current

A

a relatively low amperage used to maintain the arc during pulsed spray transfer GMAW

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

an alternate term for constant voltage

A

Constant potential

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

an electrode that melts and becomes part of the weld

A

Consumable electrode

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

Drive rolls

A

the rolls in a were drive unit that are directly driven by the units drive motor

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

Flow meter

A

a device that controls the amount of gas that goes to the welding torch

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

flux cored arc welding (FCAW)

A

a welding method in which heat is supplied by an arc between the base metal and a hollow, flux-filled electrode.

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

Gas metal arc welding (GMAW)

A

an arc welding process that uses a continuously fed consumable electrode and a shielding gas. Sometimes called MIG Welding

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

Globular transfer

A

in GMAW, the movement of molten metal in lare droplets from the consumable electrode across the arc

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

Helium

A

an inert, colorless gas used as a shielding gas in welding

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

Type of welding machine used for GMAW

A

Inverter

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

Liner

A

a flexible tube placed inside the combination cable through which a consumable wire electrode passes on its way to the GMAW torch

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

Common term for Gas Metal Arc Welding (GMAW)

A

Metal inert gas

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

Metal transfer

A

movement of metal from one surface to another

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

Pulsed spray transfer

A

a GMAW process in which the current is pulsed to take advantage of the spray mode of metal transfer, but with current values below the spray transition current

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

Purge switch

A

a switch on a welding machine that manually controls the flow of shielding gas

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

Push-pull system

A

a system formed when a GMAW pull gun pulls the electrode wire through the cable and the wire feeder pushes the wire

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

Self-shielded electrode

A

an electrode that produces its own shielding gas and does not require additional shielding gas

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

Short circuit transfer

A

a GMAW process that uses relatively low voltage. The arc is constantly interrupted and restarted as the molten electrode shorts out against the base emtal

42
Q

Transfer-rectifier

A

one type of constant voltage rectifier

43
Q

Wire feeder

A

in GMAW, the device that continuously feeds consumable electrode wire to the welding gun.

44
Q

Wire tension control knob

A

the device used to control the pressure applied to the drive rolls of a wire feeder

45
Q

Regulator

A

a device used to control the volume and pressure of a welding or shielding gas as it flows from the cylinder to the torch

46
Q

most effective current for GMAW because it produces deep penetration

A

DCEP

47
Q

GMAW power source

A

DC - direct current

48
Q

_____ is directly related to arc length

A

Voltage

49
Q

contact tip-to-work distance

A

the distance from the end of the contact tip to the work and includes arc length

50
Q

Gs diffuser

A

distributes gas evenly around the welding wire and contact tip

51
Q

Gas nozzle

A

directs the flow of shielding gas to the molten weld

52
Q

Insulator

A

prevents the gas nozzle from becoming energized; reduces heat transfer from the gas nozzle to the conductor tubes

53
Q

Wire feed speed control

A

Adjusts the speed with which welding wire feeds the arc

54
Q

Voltage control

A

Allows the welder to set optimum arc length

55
Q

Purge button

A

allows welder to set the shielding gas flow rate without using the gun trigger; used to purge gas line in the welding gun cable before welding

56
Q

Axially

A

In a straight line along an axis

57
Q

Composite metal-core wire electrode

A

A filler wire electrode with a hollow core containing powdered materials, primarily metals.

58
Q

Stick out

A

The length of electrode that projects from the contact tube, measured from the arc tip to the contact tube.

59
Q

Name the 5 basic pieces of equipment required for GMAW

A
  • welding power source
  • wire feeder compatible with machine
  • welding gun
  • spooled filler wire
  • shielding gas
60
Q

Gun and cable assemblies are rated by…

A

Their current rated capacity

61
Q

What is the job of a regulator?

A

A regulator reduces the gases from source pressure to a working pressure.

62
Q

What does amperage control?

A

Burn off and penetration

63
Q

What is the main purpose of slope?

A

To limit the short circuiting current so spatter is reduced.

64
Q

Very fine droplets of metal transferred across the arc in a axial fasion, describes what mode of metal transfer?

A

Spray transfer

65
Q

When using GMAW, an increase in the arc voltage produces what?

A

Wider arc stream and shallower penetration

66
Q

What must be considered before using a mini-bulk system?

A

Frequency of use

67
Q

Spray transfer employs higher:

A

Voltage settings

68
Q

Recommended power source for FCAW

A

DC

CV

69
Q

What’s the purpose of the electrode (wire) feed control?

A

To supply the continuous electrode to the welding arc at a constant preset rate

70
Q

Gas shielding equipment includes:

A

Gas source
Pressure regulator
Flowmeter
All necessary hoses and connectors

71
Q

Most common metals to weld on using FCAW

A
  • Mild steels
  • High strength steel
  • Chrome-molybdenum steel
  • stainless steel
  • abrasive resistant steel
  • cast steels
  • nickel alloys
72
Q

Electrode classification for FCAW:

E 7 0 T - X M J HZ

Designate each one…

A

E-electrode

70-tensile strength

T-indicates electrode is FCAW

X-refers to usability of electrode

M-indicates electrode is classified using 75-80% argon/balance CO2

J-requirements for improved toughness

HZ-requirements of diffusible hydrogen test

73
Q

Travel speed

A

The linear rate at which the arc is moved along the weld joint

74
Q

GMAW Advantages

A
  1. Can weld all commercial metals
  2. All position welding
  3. Deposition rates are higher
  4. Faster travel speeds
  5. Continuous welds
  6. Minimal post-weld cleaning
75
Q

GMAW limitations

A

The equipment required for GMAW is more…

- costly
- complex
- less portable

Limited outdoor use

76
Q

The modes of metal transfer for GMAW are:

A

Short-circuiting transfer

Globular transfer

Spray transfer

77
Q

The mode of transfer is determined by:

A
  • Magnitude, type and polarity of welding current
  • electrode diameter
  • electrode composition
  • electrode extension
  • shielding gas composition
78
Q

GMAW-S

A

Short-circuiting transfer

Metal transfer results when molten metal from a consumable electrode is deposited during repeated short-circuits

79
Q

GMAW wire packaging and delivery systems consist of:

A

Spools
Coils w/ support
Coils w/o support
Drums

80
Q

A filler metal packaging configuration in which the wire is wound around a cylinder (called a barrel), which is flanged at both ends. The flanges contain a spindle hole centered side the barrel.

A

Spool

81
Q

GMAW electrodes packaging sizes include:

A

2 lb
13 lb
44 lb

82
Q

A cylindrical filler metal package used to contain a continuous length of wound or coiled filler metal wire.

A

Drum

83
Q

Delivery systems used in heavy industry consisting of a separate location for electrode storage components and extended liners (hose packs) to deliver the electrode to the wire feed rolls.

A

Bulk electrode system

84
Q

Recommended wire sizes for welding thin materials:

A

.023 - .035 inches

85
Q

CV welding power sources for GMAW can be:

A

Transformer-rectifiers or inverters

86
Q

An increase in voltage will produce…

A

A flatter, wider bead

87
Q

Excessive voltage can cause problems with…

A

Burnback

88
Q

CV power sources are designed to…

A

Maintain selected arc voltage

89
Q

Electrode extension

A

Is the distance from the contact tip to the end of the welding wire.

90
Q

Welding gun cable…

A

Conducts the welding wire, shielding gas and current to the gun

91
Q

Gun cable liner

A

Serves as a conduit for the welding wire

92
Q

Welding gun components include:

A

Contact tip
Nozzle
Diffuser
Insulator

93
Q

Diffuser

A

Distributes shielding gas evenly around the welding wire and contact tip

94
Q

Nozzle

A

Directs the flow of shielding gas to molten weld

95
Q

Insulator

A

Prevents nozzle from becoming energized

96
Q

Ire feed speed control

A

Adjusts the speed with which welding wire feeds the arc.

97
Q

Voltage control

A

Allows a the welder to set the optimum arc length

98
Q

Purge button

A

Allows welder to set shielding gas flow rate w/o using the gun

99
Q

Most common wire feeder for steel welding wire is the…

A

Push type wire feeder

100
Q

Shielding gas affects the properties of…

A

The weld deposit

Film Appreciation (6 decks)

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