GMAW on mild steel

Question 1

Is it necessary to remove scale and rust from the base metal? explain your answer. yes or no

Answer 1

yes - remove excess crap to prevent contamination of the weld zone and reduce harmful fumes.

Question 2

Describe a stringer bead

Answer 2

a single pass of weld made with no side-to-side motion. the only movement of the electrode is in the direction of travel.

Question 3

how should you lay beads when surface welding for buildup work?

a) space them so they are 3.2mm apart
b) blend them together so that they form a solid layer of weld metal
c) space them so they are 6.4mm apart
d) the toe on one bead should meet the toe of the next bead.

Answer 3

b) blend them together so that they form a solid layer of weld metal

Question 4

in what positions can you do surface welding with GMAW using short-circuit metal transfer.

a) flat position only
b) flat and horizontal positions only
c) all positions except vertical
d) all postions

Answer 4

d) all postions

Question 5

what is the normal electrode angle when doing single-pass 1F welds

a) 90degrees to the joint angle
b) 45 degrees to the joint angle
c) 15 - 20 degrees to the joint angle
d) 180 relative to the welders postion

Answer 5

b) 45 degrees to the joint angle

Question 6

How is work positioned for a 1 F Tee joint?

a) 90 and 0 on the horizontal plane
b) 180 and 360 to the horizontal plane
c) 120 and 60 to the horizontal plane
d) each member at 45 to the horizontal plane

Answer 6

d) each member at 45 to the horizontal plane

Question 7

Given a choice, what position should you use to achieve the most productive fillet welding?

a) 4F
b) 1G
c) 1F
d) 6F

Answer 7

c)1F

Question 8

What is the recommended gun angle for the first pass of a 2F weld on 10mm material with three stinger bead passes specified?

a) 90 to the vertical plane
b) 90 to the horizontal plane
c) 45 to the vertical and horizontal plane
d) 270 to the welder’s initial position prior to an arc ignition.

Answer 8

c) 45 to the vertical and horizontal plane

Question 9

What type of bead is usually used for the cover pass on a 3F weld on 10mm material?

a) weave bead
b) stringer bead
c) modified lazy L bead
d) long dwell crown bead.

Answer 9

a) weave bead

Question 10

What is the likely weld progression for the first pass on a 3F weld on 10mm material?

a) uphill
b) downhill
c) sleight of hand
d) back step

Answer 10

b)downhill

Question 11

What joint configuration is generally used for a 1G weld with a VEE groove preparation on 10mm material?

a) 4mm root face, 2.5 mm gap
b) 4mm gap, 1.6mm root face
c) 4mm root face, 4mm gap
d) 1.6mm gap, 3.2mm root face

Answer 11

b) 4mm gap, 1.6mm root face

Question 12

How many passes are generally used for a 1G weld with a Vee grove preparation on 10mm material using 0.9mm wire?

a) 3 or 4 passes
b) 5 or 6 passes
c) 6 or 7 passes
d) 1 or 2 passes

Answer 12

a) 3 or 4 passes

Question 13

What procedure is recommended to complete a 2G weld with a Vee groove preparation on 10mm material.

a) completely fill the joint with one large pass.
b) use one root bead followed by one weave bead cover pass
c) use stringer beads on all fill and cover passes, working from the bottom upwards.
d) use stringer Beads on all fill and coverer passes, working from top downwards.

Answer 13

c) use stringer beads on all fill and cover passes, working from the bottom upwards.

Question 14

The number and letter nominations of 1F and 2G represent:

a) the type of filler wire and shielding fas to be used for the project
b) the position and type of weld to be completed.
c) the joint design and configuration
d) the welding process and joint design to be used.

Answer 14

b) the position and type of weld to be completed.

Question 15

A WPS allows minor changes in the welding voltage and amperage. True or False.

Answer 15

True

Question 16

The root pass is becoming excessively heavy as you weld a pipe in the 1GR position. What corrective action should you take while welding?

a) work closer to the 12o’clock position of the pipe?
b) work closer to the vertical position, progressing downhill
c) slow the travel speed across the centre of the weld.
d) incline the electrode more into the direction of travel.

Answer 16

b) work closer to the vertical position, progressing downhill

Question 17

Single VEE preparations on pipe generally have an included angle within the range of:

a) 22.5 to 30
b) 30 to 45
c) 45 to 60
d) 60 to 75

Answer 17

d) 60 to 75

Question 18

Do all tack welds become an integral part of the weld?

Answer 18

No. bridging tacks must be removed as welding progresses.

Question 19

Where should the four tack welds be located on a 150mm pipe to be welded in the 5G position?

Answer 19

12, 3,6,9 o’clock positions.

Question 20

What is the maximum length of tack welds used for joining 150mm sch. 80 pipe?

Answer 20

3/4”

Question 21

If a pipe is fit so that the gap is not uniform, at what location should the widest portion of the gap be placed in preparation for welding?

Answer 21

The widest gap should be placed at or near the last quarter of the joint to be welded

Question 22

on an 80mm sch. 40 pipe; what is the minimum number and length of tacks required?

a) 2 tacks 25.4mm long
b) 2 tacks at 12.7mm long
c) 3 tacks at 12.7mm long
d) 4 tacks at 25.4 mm long

Answer 22

c) 3 tacks at 12.7mm long

Question 23

What is the root gap between the test plates for CWB 2Gtest weld.?

a) 6.4mm
b) 8mm
c) 10mm
d) 13mm

Answer 23

b)8mm

Question 24

How far are the stops. starts from the edge of the CWB 4GF test plate?

a) 13mm
b) 19mm
c) 25.4mm
d) 38mm

Answer 24

d)38mm