Red Seal Welding Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

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What is the maximum interpass temperature recommended for welding carbon steel?

Usually around 200°F

Usually around 300°F

Usually around 400°F

The recommended maximum interpass temperature for welding carbon steel is typically around 400°F. Maintaining the interpass temperature within this range is crucial for several reasons.

Firstly, when welding carbon steel, higher interpass temperatures can lead to undesirable outcomes such as reduced mechanical properties of the welded joint. Excessive heat can cause the steel to lose some of its toughness and strength, resulting in a weld that may not perform adequately under stress.

Additionally, staying near the 400°F mark helps to minimize the risk of hydrogen-induced cracking. Hydrogen can become trapped in the weld pool, and if the interpass temperature is too high, it may not diffuse out adequately, leading to potential failures in the weld.

In essence, adhering to the recommended interpass temperature ensures the integrity and durability of the weld while maintaining the overall quality of the steel being welded, making it an essential practice in welding procedures for carbon steel.

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Usually around 500°F

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