Groove Welds 1G, 2G, 3G

Question 1

What is the recommended joint preparation for a 1G, 2G, or 3G weld without backing?

Answer 1

Both edges are bevelled to 30 degrees, with a 60 degree included angle. The land and gap are to match each other. Can be from 3/32”-1-8” (2.5mm - 3.2mm)

Note about 2G, plates are to have some preset. 3-4 degrees.

Question 2

How long can you tacks be for a 1G, 2G, or 3G weld?

Answer 2

1/4” - 3/8” (6mm - 10mm)

Question 3

For a 1G weld, what should your electrode inclination be?

Answer 3

0-10 degrees backhand for all passes

Question 4

For a 1G weld, what is your electrode angle?

Answer 4

It should be 1/2 of the included joint angle (90 degrees)

Question 5

How many pass(es) can you complete on a 1G?

Answer 5

You can do either 3 or 4

Question 6

How do you know if you’ve achieved full penetration while welding a groove weld?

Answer 6

By maintaining a continuous keyhole and a fluid puddle.

Question 7

What type of bead is produced with an electrode inclination of 90 degrees?

Answer 7

A medium width bead

Question 8

Which position out of 1G, 2G, or 3G is subject to the most distortion?

Answer 8

2G, since there are more passes than other positions

Question 9

For a 2G weld, what should your electrode angle be?

Answer 9

Remember you are competing with gravity. You must account for this while welding. Theoretically it would be 1/2 of the joint angle, but you need to account for this gravity.

ANSWER: An adjustment of 5 - 10 degrees may be required

Question 10

Which current setting and arc length will lead to slag entrapment?

Answer 10

Low heat setting with a long arc leads to trapped slag.

Question 11

What is the electrode inclination and electrode angle for a 3G weld?

Answer 11

Electrode inclination: 0-10 degrees backhand OR forehand

Electrode angle: 1/2 the included joint angle