Smaw: Groove Welds On Mild Steel

Question 1

An electrode inclination of 0 with a normal arc length produces a

A) narrow high crowned stringer bead
B) medium width bead with smooth metal flow
C) medium width bead with shallow penetration
D) a narrow rough surfaces deposit

Answer 1

B) medium width bead with smooth metal flow

Question 2

State the recommended joint preparation for groove welds on 10 mm (3/8) plate in these positions

1 G without backing

3 G without backing

3 GF with backing

2 G without backing

Answer 2

30 degree bevel on both sides
2.5 mm - 3.2 mm (3/32 - 1/8) land and gap (1, 3, 2)

3 GF 13 mm 1/2 space, single bevel no land

Question 3

What is the purpose of tacking the ends from the backside of your open groove weld coupons

Answer 3

To ensure full root bead fusion at the ends of the plates

Question 4

Unless it is otherwise specified, what grade of steel is the permanent backing material to be

Answer 4

If the backing is to be permanent the grade of material is to be the same as the material being joined

Question 5

What is the purpose of the backing material on welds with a backer

Answer 5

To support and shape molten weld metal at the root of the joint

Question 6

What do you have to be very careful of when welding a joint with a permanent backer

Answer 6

You need to ensure full fusion between the base metal and the backing

Question 7

What is a good rule for pass placement when multi pass welding

Answer 7

Always achieve penetration into the narrowest portion of the joint

Question 8

What action increases penetration on the root of a 2G weld

Answer 8

Shorten the arc length

Question 9

For complete penetration on an open root groove weld using E4310 (E6010) electrodes you must

Answer 9

Carry a continuous keyhole

Question 10

What weld position generally results in the highest amount of distortion

Answer 10

2G

Question 11

When you deliberately shorten the arc length you can expect to increase

Answer 11

Penetration and decrease puddle fluidity

Question 12

Which of the following would most likely produce slag inclusions in multi pass welds

Answer 12

Low current settings with a long arc length

Question 13

What is required to ensure that full fusion is obtained on the root pass of a 1 G position weld on 10 mm (3/8) material

Answer 13

Progression maintaining a continuous keyhole

Question 14

Is it necessary to remove scale and rust from base metal

Answer 14

Yes

Question 15

What joint configuration is suggested for a 1G weld with a vee groove preparation on a 10 mm (3/8) material with a 60 degree included angle

Answer 15

Root face preparation is comparable to the gap

Question 16

How many passes would you likely use for a 1G weld with a vee groove preparation on 10 mm (3/8) material using 3.2 mm (1/8) E4310 (E6010) for the root and a 2.5 mm E4918 (3/32 E7018) for the full and cap passes

Answer 16

3 or 4 passes

Question 17

When doing the root bead of a 1G weld, what action would you take if the keyhole is not melting evenly in the groove

Answer 17

Immediately adjust the electrode angle to force the keyhole into the centre

Question 18

What is the main purpose of the hot pass

Answer 18

To penetrate into the root and melt out the slag or undercut

Question 19

Most codes and standards do not accept a crack or open defect …

Answer 19

3.2 mm (1/8) length measured in any direction

Question 20

What is the root spacing for a CSA 2 G with backing test weld

Answer 20

8 mm (5/16)