If Charpy impact properties are a requirement of a welding procedure, then the:

• A. WPS does not need to be qualified in accordance with ASME and AWS standards
• B. WPS requires ultrasonic inspection as part of the qualification
• C. procedure must be qualified by testing
• D. procedure can be prequalified if all other conditions apply

Answer: (C)

Charpy impact toughness requirements mean you must demonstrate, through actual testing, that the welding procedure can produce a weld with the specified notch-toughness. To meet those toughness requirements, the procedure must be qualified by testing—you weld a test coupon using the same materials and parameters, then prepare Charpy impact specimens from the weld metal (and, if required, the heat-affected zone) and verify the impact energy meets the specified value at the required temperature. If the test results pass, the WPS is qualified; if not, you must adjust the procedure and retest.

Ultrasonic inspection isn’t how toughness is proven; it checks for internal defects, not Charpy energy. Prequalification isn’t a substitute for showing the required impact properties when the WPS specifies Charpy toughness.