CWI Code Book Application 5

Question 1

Under AWS D1.1, what is the maximum length of a single acceptable rounded indication in a groove weld inspected by RT, for a weld in base metal 3/4 inch thick?

Accepted Answer

3/16 inch (4.8 mm)

Answer

AWS D1.1 limits individual rounded indications in RT to a maximum of t/4 for metal up to 1 inch thick, so for 3/4 inch base metal the limit is 3/16 inch.

Question 2

Per AWS D1.1, when must weld tabs (run-off tabs) be removed after welding?

Accepted Answer

Only when specified by the engineer of record

Answer

AWS D1.1 requires removal of weld tabs only when specified by the engineer; if not specified, the contractor may leave them in place.

Question 3

In ASME Section IX, what is the purpose of the P-number system for base metals?

Accepted Answer

To group metals with similar welding characteristics to reduce the number of qualifications required

Answer

ASME P-numbers group base metals with similar welding characteristics so that qualifying a WPS on one metal in the group qualifies it for all metals in that group.

Question 4

According to AWS D1.1, what condition exists when weld discontinuities are evaluated using the 'limitations on accumulation' rule in RT inspection?

Accepted Answer

Indications clustered within a 12-inch weld length exceed 2 inches total

Answer

AWS D1.1 applies an accumulation rule that rejects when the total length of acceptable indications in any 12-inch weld length exceeds 2 inches, preventing clustered marginal defects.

Question 5

Under AWS D1.1, a complete joint penetration groove weld made from one side without backing requires which testing to confirm full fusion at the root?

Accepted Answer

RT or UT to verify root fusion

Answer

CJP welds made from one side without backing require RT or UT to verify complete root fusion since visual inspection cannot reveal subsurface root defects.

CWI Practice Test

CWI Practice Test

CWI Code Book Application 5