WELD 121 Practice Test

Lack of penetration is best described as:

Excessive fusion at root Penetration occurs but not at root Occurs only in TIG welding Insufficient fusion at the joint root caused by inadequate heat input, incorrect joint preparation, or improper travel speed

Correct Answer:

Insufficient fusion at the joint root caused by inadequate heat input, incorrect joint preparation, or improper travel speed

Explanation:

Penetration is about how deep the weld fuse extends into the joint. Lack of penetration means the weld does not fuse all the way to the root of the joint—the root isn’t fully fused. This happens when heat input is too low, the joint isn’t prepared properly, or the travel speed is too fast, all of which give the molten metal insufficient time or opportunity to fuse at the root. If the heat is insufficient, or the joint is misfitted or dirty, or you move too quickly, the weld remains shallow and the root stays weak. Other descriptions either imply too much fusion, or that fusion occurs somewhere other than the root, or incorrectly claim it happens only in a specific process.

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