AG Mechanics CDE Practice Exam 2025 – The Comprehensive All-in-One Guide for Success

Question: 1 / 400

During welding, which direction does heat move most rapidly in metal?

Downward

During welding, heat moves most rapidly downwards in metal because of gravity. Heat is laterally conducted along the top surface of the metal and is then conducted downwards through the thickness of the metal, creating a temperature gradient. This means that the base of the metal becomes hotter faster than the top surface, leading to heat moving downwards at a more rapid pace. This explains why option D, vertically downward, is incorrect. Heat is also not moving horizontally (option B) or upwards (option C), as those directions do not follow the natural flow of heat in metal. Therefore, the most accurate option is A, downward.

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Horizontally

Upward

Vertically downward

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