CWS Weld Inspection & Testing Flashcards
6 cards from real CWS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CWS Weld Inspection & Testing flashcards as text
Which nondestructive testing (NDT) method uses high-frequency sound waves to detect internal weld discontinuities?
Answer: Ultrasonic testing
Ultrasonic testing (UT) transmits high-frequency sound waves into a weld to detect internal flaws such as porosity, cracks, and incomplete fusion.
According to AWS D1.1, what is the minimum preheat temperature required for ASTM A36 steel greater than 1.5 inches thick?
Answer: 150°F (66°C)
AWS D1.1 requires a minimum preheat of 150°F for A36 steel over 1.5 inches thick to prevent hydrogen-induced cracking.
A CWS notices undercut along the toe of a fillet weld. What is the most common cause of this discontinuity?
Answer: Excessive travel speed
Excessive travel speed causes the weld pool to lag, producing undercut at the weld toe as the arc erodes base metal without sufficient fill.
Which weld discontinuity is characterized by a fold of metal that has been rolled or forged into the surface but is not fused to the base metal?
Answer: Overlap
Overlap is a protrusion of weld metal beyond the weld toe, lying on the base metal without fusing to it.
When performing a macro examination of a weld cross-section, which etchant is most commonly used for carbon steel welds?
Answer: Nital (nitric acid in alcohol)
Nital (2–5% nitric acid in ethanol) is the standard etchant for revealing weld macro structure, HAZ boundaries, and fusion lines in carbon steel.
A radiographic test report shows a 2T indication in a groove weld. What does '2T' refer to?
Answer: Two times the material thickness
In radiographic testing, 'T' refers to material thickness, so 2T indicates a discontinuity length equal to twice the nominal material thickness.