Preheat controls the _ of the weld, which in turn controls the of the HAZ.

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Study for the AIT Welder 2nd Period Test. With flashcards and multiple choice questions, each question offers hints and explanations. Prepare confidently for your certification!

Multiple Choice

Preheat controls the _ of the weld, which in turn controls the of the HAZ.

Preheating changes how fast the weld and the surrounding metal cool after welding. That cooling rate largely determines the microstructure formed in the heat-affected zone. When cooling is slower due to preheating, the HAZ tends to develop softer, more ductile structures and lower peak hardness; if cooling is rapid, harder, more brittle structures can form. So preheat controls the cooling of the weld, which in turn controls the hardness of the HAZ.

Preheat controls the ___________ of the weld, which in turn controls the __________ of the HAZ.

Study for the AIT Welder 2nd Period Test. With flashcards and multiple choice questions, each question offers hints and explanations. Prepare confidently for your certification!

Preheat controls the ___________ of the weld, which in turn controls the __________ of the HAZ.

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Preheat controls the _ of the weld, which in turn controls the of the HAZ.

Preheat controls the _ of the weld, which in turn controls the of the HAZ.