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Second Year Welding > GTAW On Mild Steel > Flashcards

GTAW On Mild Steel Flashcards

1
Q

How should you lay the beads when surface welding for buildup work

A

Blend them together so they form a solid layer of weld metal

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2
Q

Is it necessary (yes or no) to remove the following from the mild steel base metal before welding with GTAW
- millscale
- loose rust
- oil
- varnish
- soapstone markings

A
  • no but is can be done to reduce undercut on the cap pass
  • yes
    -yes
  • yes
  • no
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3
Q

Identify the following for GTAW on mild steel
Most common electrode type
Electrode preparation shape
Current type

A

EWTh 2
Conical
DCSP
DCEN

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4
Q

What shielding gas is most often used for GTAW on mild steel

A

Argon

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5
Q

What size of gas nozzle is recommended for any GTAW application

A

The smallest nozzle whose lip does not melt in the heat of the arc yet allows good visibility and adequate gas shielding

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6
Q

An appropriate electrode stick out for GTAW

A

Maintains a gas shield around the electrode and molten weld metal

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7
Q

Advantage and disadvantage of touch start

A

Adv: DC without high frequency

Disv: may contaminate the electrode

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8
Q

Advantage and disadvantage of high frequency start

A

Adv: start without contamination

Disv: ceramic nozzles must be used

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9
Q

Advantages and disadvantages of lift start

A

Adv: no high frequency required

Disv: machine design must be compatible

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10
Q

Name two techniques used for adding filler rod with GTAW

A

Dip feed
Continuous

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11
Q

Changing the inclination of the electrode holder in relation to the direction of travel

A

Changes the depth of penetration of the weld

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12
Q

In what positions can you do surface welding with GTAW

A

All positions

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13
Q

Describe the purpose of tailing out prior to breaking the arc

A

Prevent cracking in the weld crater

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14
Q

How is the work positioned for a 1F tee joint

A

Each member at 45 to the horizontal plane

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15
Q

Given the choice what position should you use for the most productive fillet welding

A

1F

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16
Q

What is the recommended electrode angle for a 2F weld on 10 gauge material

A

45 degree to the vertical and horizontal planes

17
Q

What is the likely weld progression for a single pass 3F weld on 10 gauge material with GTAW

A

Uphill

18
Q

As a general rule at what thickness of material should joint preparation be considered for full penetration groove welds when using GTAW

A

3/16

19
Q

What is the recommended electrode inclination for 1G weld

A

0-15 forehand

20
Q

Describe the dip technique of adding filler rod

A

Filler rod is added at the leading edge of the puddle until the desired fill is attained and then removed from the puddle to progress forward

21
Q

What is fall through

A

A localized area of excessive penetration

22
Q

What is the max electrode extension used for GTAW and why

A

Do not extend the electrode beyond 1/4 bc this may result in inadequate gas

23
Q

What is likely to happen if a keyhole forms in the 1G position

A

Fall through

24
Q

What is meant by suck back and how may it occur

A

Suck back refers to an area of root bead that has been drawn into the groove leaving the root side concave in contour. Caused by overheating the root pass during the second pass application.
- travel speed to slow
High current settings for overhead positions
Excessive arc length
Failure to add filler rod deep enough into the backside of the groove

25
Q

3 actions may be used to increase root bead penetration

A

Change electrode inclination
Slow the travel speed
Shorten the arc length
Increase amp
Add filler metal closer to back of groove
Change configuration of land and gap

26
Q

In multi pass welds which pass is more susceptible to cracking

A

The root pass

27
Q

A procedure used to help prevent weld bead crater cracking is

A

Tailing out prior to breaking the arc

28
Q

What is the purpose of pre setting the 2G weld on a plate

A

Compensates for shrinkage caused by stringer bead multi pass welding

29
Q

What is the recommended bevel angle range for a single vee groove weld prep on a pipe

A

30-37.5

30
Q

How many tacks are recommended for joining 6” nominal pipe size

A

4

31
Q

If the gap is unequal after the first two tacks have been places on a pipe joint you should

A

Place the third tack at the widest location to even out the gap

32
Q

Which of the following would be most effective in reducing accidents caused by portable grinders kicking back

A

Keep both hands on the grinder and clamp the work

Second Year Welding (13 decks)

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