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

Question: 1 / 400

Which welding defect can lead to a compromised joint strength?

Good penetration

Incomplete fusion

Incomplete fusion is a significant welding defect that impacts the integrity and strength of the joint. Incomplete fusion occurs when the molten weld metal fails to bond properly with the base material or itself during the welding process. This condition creates weak spots or voids in the joint, which can reduce the joint’s load-bearing capacity and the overall durability of the weld.

When a weld does not fully fuse, it may create areas that are susceptible to cracks or fatigue, especially under stress or loading situations. It is crucial for welds to have complete fusion to ensure that they can withstand operational forces without failing. In contrast, features like good penetration, uniform deposition, and a no heat-affected zone generally contribute positively to the strength and quality of a weld, making them less likely to be associated with compromised joint strength.

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Uniform deposition

No heat-affected zone

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