Welder Red Seal · Question
A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The welding procedure specification (WPS) calls for a specific shielding gas and preheat. Why is it particularly crucial to adhere strictly to the WPS for HSLA steels?
HSLA steels are prone to hydrogen-induced cold cracking and require careful control of heat input, preheat, and interpass temperatures to manage the cooling rat
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Question: A welder is preparing to weld 20 mm (0.8 in) thick high-strength low-alloy (HSLA) steel using FCAW-G. The welding procedure specification (WPS) calls for a specific shielding gas and preheat. Why is it particularly crucial to adhere strictly to the WPS for HSLA steels?
Answer options:
- To maximize aesthetic appeal of the weld bead.
- To ensure proper current type (AC vs. DC). ✅ To prevent cold cracking and maintain mechanical properties.
- To optimize arc stability in all positions.
Correct answer: To prevent cold cracking and maintain mechanical properties.
Explanation: HSLA steels are prone to hydrogen-induced cold cracking and require careful control of heat input, preheat, and interpass temperatures to manage the cooling rate and prevent hydrogen entrapment, thereby maintaining their desirable mechanical properties. Aesthetic appeal is secondary, and current type or arc stability are less critical than preventing cracking in HSLA steels.
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- A welder is fabricating a pressure vessel component using FCAW-G with an E70T-1 wire. The procedure specifies
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- When performing FCAW-G (gas-shielded flux-cored arc welding), a welder notices the arc is unstable and the wir
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