CWI Code Book Application 4

Question 1

Under AWS D1.1, which weld type requires the inspector to verify that the weld size (throat) matches the drawing requirement after welding?

Accepted Answer

Partial joint penetration (PJP) groove weld

Answer

PJP groove welds have a specified effective throat that must be verified, while CJP welds require full penetration, making throat size the inspector's key check for PJP.

Question 2

In AWS D1.1, what is the minimum overlap required for lap joints using fillet welds?

Accepted Answer

5t (five times the thinner member thickness)

Answer

AWS D1.1 requires a minimum overlap of 5 times the thickness of the thinner member for lap joints to prevent rotation and peeling.

Question 3

According to ASME B31.3, what determines whether a weld joint requires 100% radiographic examination?

Accepted Answer

The severity category and fluid service classification

Answer

ASME B31.3 requires 100% RT based on the combination of fluid service category (Normal, Category D, Category M, High Pressure) and the applicable examination severity level.

Question 4

When AWS D1.1 Table 4.5 lists qualification test positions for plate groove welds, qualification in position 3G and 4G qualifies the welder in which positions?

Accepted Answer

1G, 2G, 3G, and 4G (all positions)

Answer

Passing qualification tests in both 3G and 4G positions qualifies a welder for all flat, horizontal, vertical, and overhead positions for plate groove welds per AWS D1.1.

Question 5

Per AWS D1.1, after a weld repair is made to correct a discontinuity found by RT, what must happen before the area is accepted?

Accepted Answer

The repaired area must be re-examined by the same or equivalent NDT method

Answer

AWS D1.1 requires that repaired weld areas be re-examined using the same NDT method (or equivalent) used to detect the original discontinuity.

CWI Practice Test

CWI Practice Test

CWI Code Book Application 4