FAA AMT Airframe Test 2025 – 400 Free Practice Questions to Pass the Exam

Question: 1 / 1030

Why are aluminum plates 1/4 inch or more thick usually preheated before welding?

Improves the weld appearance

Reduces internal stresses and assures more complete penetration

Preheating aluminum plates before welding can help reduce internal stresses, which can lead to better penetration and a more reliable weld. Thicker plates tend to dissipate heat at a slower rate, which can make it difficult for the weld to penetrate fully. By preheating the material, the heat is evenly distributed and the weld can better penetrate through the entire thickness of the plate. This can also help prevent cracking or distortion in the welded joint. While preheating may improve the weld appearance in some cases, its primary purpose is to ensure a strong and durable weld by reducing internal stresses. Decreasing welding time or increasing hardness are not significant factors in the decision to preheat aluminum plates.

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Decreases welding time

Increases the hardness of the weld

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