AL Conveying Practice Questions - Alabama Conveying Contractor Examination Exam

Preheating thick structural steel before welding a heavy conveyor support is done primarily to:

Slow the cooling rate so the weld and heat-affected zone are less prone to hydrogen cracking and hardening Burn off the need for shielding gas or flux Allow the use of a smaller electrode than the procedure specifies Eliminate the need for joint fit-up

Correct Answer:

Slow the cooling rate so the weld and heat-affected zone are less prone to hydrogen cracking and hardening

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