CWI Joint Design and Weld Joint Types 2

Question 1

The theoretical throat of a fillet weld is defined as the distance from the joint root to the:

Accepted Answer

Hypotenuse of the largest right triangle inscribed in the weld cross section

Answer

Face of the weld

Answer

Nearest toe of the weld

Answer

Midpoint of the weld leg

Question 2

For an equal-leg fillet weld with legs at 45°, the theoretical throat is approximately what fraction of the leg size?

Accepted Answer

0.707 × leg size

Answer

0.500 × leg size

Answer

0.600 × leg size

Answer

0.866 × leg size

Question 3

Per AWS D1.1, what is the minimum fillet weld size required when the thicker base metal being joined exceeds 3/4 inch (19 mm)?

Accepted Answer

5/16 inch (8 mm)

Answer

1/4 inch (6 mm)

Answer

3/8 inch (10 mm)

Answer

1/2 inch (12 mm)

Question 4

A plug weld is made by:

Accepted Answer

Depositing weld metal in a hole in the overlapping member to fuse it to the underlying member

Answer

Preparing a groove along the edge of a base metal member

Answer

Welding along a slot cut through the length of one member

Answer

Joining two members end to end in the same plane

Question 5

The root face (land) in a groove weld joint is included primarily to:

Accepted Answer

Prevent burn-through and provide a surface for the root pass to fuse against

Answer

Increase the effective groove angle

Answer

Reduce the need for filler metal at the root

Answer

Increase weld penetration depth

Question 6

Which weld joint type is generally preferred for members subject to fatigue loading because it minimizes stress concentrations?

Accepted Answer

Butt joint with complete joint penetration

Answer

Lap joint with fillet welds

Answer

Tee joint with fillet welds on both sides

Answer

Corner joint with partial penetration groove welds

Question 7

A slot weld differs from a plug weld in that:

Accepted Answer

A slot weld is made in an elongated hole rather than a circular hole

Answer

A slot weld is made from the back side of the joint

Answer

A slot weld requires a groove preparation unlike a plug weld

Answer

A slot weld is always a groove weld, not a fillet weld