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Rv > Welding > Flashcards

Welding Flashcards

1
Q

What does GMAW

A

Gas metal arc welding

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2
Q

What is DCEP

A

Direct current, electrode positive

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3
Q

What is the “mode of metal transfer”?

A

The way that the weld metal transfers across the arc from the end of the electrode to the weld zone

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4
Q

What are the 3 different basic modes of metal transfer?

A
  • short-circuiting transfer
  • globular transfer
  • spray transfer
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5
Q

What are the 5 factors that determine the mode of metal transfer?

A
  • weld current
  • filler wire diameter
  • arc length (heat control)
  • type of shielding
  • position of welding
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6
Q

Which type of welding produces the least amount of spatter?

A

Spray arc welding (spray transfer)

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7
Q

What kind of welding occurs when there is a 85% argon or higher?

A

Spray transfer

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8
Q

What is the transition current?

A

?

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9
Q

Which has a higher arc voltage:

Spray transfer or short circuit transfer?

A

Spray transfer?

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10
Q

What is globular transfer?

A

When the metal passes through an open arc in the for of large globules

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11
Q

What is the current setting for globular transfer?

A

Between short-circuiting and spray transfer

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12
Q

What size wire is used in short-circuiting metal transfer?

A

0.023-0.045”

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13
Q

How does short-circuiting metal transfer work?

A

The filler wire makes Direct contact with the base metal, creating a short-circuit in the arc. It then melts off and melts into the base metal

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14
Q

What are the advantages of short-circuiting welding?

A
  • Minimum distortion due to low heat
  • Ideal for joining light gauge metals
  • And for fit-ups with wide gaps
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15
Q

What is most common power source used for most GMAW applications?

A

DCEP- direct current, electrode positive

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16
Q

What is AWS?

A

American welding society

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17
Q

What is the primary function of the shielding gas?

A

To shield the molten weld metal from atmospheric contamination

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18
Q

What gas is used for:
Aluminum:?
Carbon and low-alloy steels?

A

Range from argon or helium.

Steel- mixture of Argon and CO2

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19
Q

What is the purpose of the regulator?

A

It’s responsible for reducing the gas source pressure to a constant working pressure

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20
Q

What does the flow meter do?

A

They are calibrated to indicate a volumetric flow rate in L/min or CFM (cubic feet per minute)

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21
Q

What is the pressure of a full cylinder at room temp?

A

Approx. 2000 psi

22
Q

What should you do before installing the regulator onto the tank?

A

Should crack the cylinder valve for a second to blow any dirt or dust away

23
Q

What is the recommended rate of flow for the gas?

A

15-35 CFH

24
Q

What are considered Inert gas?

A

Argon, helium, and CO2

25
Q

What should you mark on an empty bottle?

A

“MT” with a soapstone

26
Q

What is the electrode angle refer to?

And what should it be?

A

Refers to the position of the wire in relation to the included joint angle
Should be on half of the included joint angle

27
Q

What is it called when you fail to fill the parent metal after melting it away?

A

Undercut

28
Q

AWS-ER-70S-6

What does each letter stand for?

A

AWS- American welding society?
E- designated Electric welding
R-designated it as a filler rod
70-tensile strength in thousands of pounds per inch
S- designates solid wire (T is for flux core or tubular wire)
6- designated wire characteristics (6: all positions)

29
Q

What is the electrode that we use in the shop

A

AWS-ER-70S-6

30
Q

What is electrode inclination?

A

It’s the position of the electrode to the work piece in relation to the direction of travel

31
Q

Which type of weld produces a flatter bead shape with less penetration?

A

A forehand inclination

32
Q

What type of inclination creates a narrower bead with a higher crown?

A

A backhand inclination

33
Q

What is the weld with the maximum penetration?

A

A 15-20 degree backhand inclination?

34
Q

What is electrode extension and what is recommended?

A

Distance from the end of the contact tube to the end of the wire?
3-8”

35
Q

What is the recommended electrode angle for a flat butt weld?

A

90 degrees

36
Q

What is the recommended placement for the nozzle end?

A

Flush with the contact tube

37
Q

What may be the issue if you aren’t getting a good weld and lots of splatter?

A

Contact tip is off centre so it changes the pattern of the shielding gas flow

38
Q

What is a cause of porosity and poor quality welds?

A

Splatter build up on the nozzle creating gas flow turbulence

39
Q

What is used to direct the shielding gas onto the weld zone?

A

The nozzle

40
Q

What can a bad ground cause?

A

Can cause an unstable arc

41
Q

What should be done before welding on any vehicle or trailer?

A

Disconnect all batteries

42
Q

What is it called when the electrode comes in contact with the base metal and fails to start and arc immediately?
What can be the causes for it?

A 
Called “stubbing”
Can be caused by:
excessive wire feed speed,
Low arc voltage or
Heavily scaled base metals
43
Q

When should the conduit liner be cleaned of any wire?

A

Every time you change the spool

44
Q

What can a badly worn or dirty contact tip cause?

A

Arc hunting

45
Q

What is the cause of a porosity, black, saggy weld

A

Lack of shielding gas

46
Q

What refers to the pockets of gas entrapped within the weld metal?

A

Porosity

47
Q

What happens when you carry a large bead with slow travel speed where the wire rides onto of the puddle?

A

Cold starts! It will not penetrate properly

48
Q

What is the “root”

A

It is the bottom of your weld with the most penetration

49
Q

What is produced when welding galvanized metals?

A

Zinc oxide

50
Q

What shade of welding tint in minimum and what is suggested?

A

10 is the minimum but CSA+AWS suggest a #11

51
Q

What kind of clothing should be worn when welding?

A 
100% cotton
Dark colour to reduce reflection
Tight knit
Gauntlet style gloves
Steel toed, leather safety boots
Welding mask
52
Q

What kind of ventilation should you have when welding?

A

A low-velocity suction hood or something that will not disturb the welding gas

Rv (23 decks)

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