AWS AWS D1.1 Structural Welding Code 4

Question 1

According to AWS D1.1, what is the minimum preheat temperature required for ASTM A36 steel with thickness over 1.5 inches when using SMAW with low-hydrogen electrodes?

Accepted Answer

150°F (65°C)

Answer

AWS D1.1 Table 4.2 requires a minimum preheat of 150°F (65°C) for A36 steel over 1.5 inches thick welded with low-hydrogen processes.

Question 2

Under AWS D1.1, which discontinuity type is ALWAYS rejectable regardless of size in cyclically loaded structures?

Accepted Answer

Cracks

Answer

AWS D1.1 prohibits cracks of any size in welds for both statically and cyclically loaded structures, making them always rejectable.

Question 3

What does AWS D1.1 specify as the maximum interpass temperature for quenched-and-tempered steels such as ASTM A514?

Accepted Answer

400°F (204°C)

Answer

AWS D1.1 limits interpass temperature to 400°F (204°C) for quenched-and-tempered steels to avoid degrading their mechanical properties.

Question 4

In AWS D1.1, a Welding Procedure Specification (WPS) must be qualified by testing when it is classified as a:

Accepted Answer

Non-prequalified WPS or one with essential variable changes

Answer

WPSs that do not meet all prequalified conditions or involve changes to essential variables must be qualified by test per AWS D1.1 Clause 4.

Question 5

According to AWS D1.1, what is the minimum fillet weld size permitted for a base metal thickness of 3/4 inch (19 mm)?

Accepted Answer

1/4 in (6 mm)

Answer

AWS D1.1 Table 8.8 requires a minimum fillet weld size of 1/4 in (6 mm) for base metal thickness from 1/2 in to 3/4 in.

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AWS AWS D1.1 Structural Welding Code 4