What action helps prevent crater cracks when stopping a weld?

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Enhance your TIG welding skills with the Nebraska GTAW FFA TIG Welding Exam. This exam features multiple choice questions and realistic scenarios to prepare you for success in TIG welding.

Multiple Choice

What action helps prevent crater cracks when stopping a weld?

Explanation:
Crater cracks form when the end of the weld is exposed to air as the metal cools and contracts. Keeping the shielding gas flowing around the crater during the finish protects the molten and solidifying metal from air, moisture, and hydrogen pickup. By using more shielding gas, you maintain a protective envelope at the end of the weld, which reduces the likelihood of oxidation and hydrogen-related cracking as it cools. The other options either add heat abruptly or fail to protect the crater, which can worsen the problem.

Crater cracks form when the end of the weld is exposed to air as the metal cools and contracts. Keeping the shielding gas flowing around the crater during the finish protects the molten and solidifying metal from air, moisture, and hydrogen pickup. By using more shielding gas, you maintain a protective envelope at the end of the weld, which reduces the likelihood of oxidation and hydrogen-related cracking as it cools. The other options either add heat abruptly or fail to protect the crater, which can worsen the problem.

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