Codes/standards sometimes specify impact testing of weldments at minimum design metal temperatures to:

• A.Assure that the welded material has sufficient yield strength to avoid brittle fracture.
• B.Assure that the welded material has sufficient ductility to assist brittle fracture.
• C.Assure that the welded material has sufficient toughness to resist brittle fracture.
• D.Assure that the welded material has sufficient tensile strength to avoid failure at design loads.

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General awareness of metallurgy is important to the welding inspector because:

• A.The crystalline structure of base metals affects the resulting structure of the weld.
• B.Physical properties of the final weldment can be significantly affected by preheat and postweld heat treatment (PWHT).
• C.A thorough knowledge of weld metal structures is necessary to understand weldability.
• D.Welding processes can affect both mechanical and corrosion properties of a weldment.

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When welding using the GTAW process, which of the following best describes the appearance of a transverse crack on a radiograph?

• A.A feathery line of longitudinal orientation located at the center of the weld image.
• B.Elongated lines of darker density, irregular in width, and slightly winding in the lengthwise direction.
• C.An irregular darker line near the center of the width of the weld image along the edge of the root pass image.
• D.A feathery, twisted line of darker density running across the width of the weld.

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When welding nickel alloys, it is important that:

• A.A wide face and thinner bevel be used.
• B.The bevel angle be wide enough to allow oscillation of welding torch.
• C.The cooling rate be controlled in order to prevent rapid cooling.
• D.Preheating is always performed to prevent hot cracking.

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What is(are) the most appropriate action(s) to prepare an in-service carbon steel piping system that has been in caustic service for welding?

• A.Grind the surfaces near the bevel to remove contaminants
• B.Verify with pH paper that any surface liquid is "basic"
• C.Neutralize and clean the surface within 6 in. (150 mm) of weld bevels
• D.Steam out the piping system and dry

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