Certified Welder Welding Code Standards & Inspection 3

Question 1

In AWS D1.1, what classification of weld discontinuity is a crack?

Accepted Answer

Category A — always rejectable

Answer

Cracks are Category A discontinuities under AWS D1.1 and are always rejectable regardless of size or location.

Question 2

What AWS standard covers welding procedures for sheet metal (thin-gauge) structural applications?

Accepted Answer

AWS D1.3

Answer

AWS D1.3 is the Structural Welding Code for Sheet Steel and applies to material typically 3/16 inch or less.

Question 3

During visual inspection, a welder inspector finds a weld with overlap (cold lap). This discontinuity is caused by:

Accepted Answer

Insufficient heat causing weld metal to flow over base metal without fusing

Answer

Overlap occurs when molten weld metal rolls over the base metal surface without fusing to it, typically due to low heat input or wrong torch angle.

Question 4

What is the minimum overlap for a lap joint fillet weld in structural steel per AWS D1.1?

Accepted Answer

Five times the thickness of the thinner member

Answer

AWS D1.1 requires the overlap of lap joints to be at least five times the thickness of the thinner part joined.

Question 5

Which NDE method is MOST effective for detecting laminar tears parallel to the plate surface in base metal?

Accepted Answer

Ultrasonic Testing (UT)

Answer

UT, especially straight-beam UT, detects planar discontinuities parallel to the surface such as laminar tears better than RT.

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