When amperage is too low, what happens to the 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

When amperage is too low, what happens to the weld?

Explanation:
Amperage sets the heat input in GTAW. If it’s too low, the arc doesn’t supply enough heat to melt the base metal (and any filler) properly, so fusion with the joint is poor. The weld pool cools quickly and doesn’t fuse smoothly, producing a bead that is uneven and ropey in appearance. Porosity comes from shielding gas issues or contamination, crater cracks from excessive or uneven cooling, and tungsten oxidation from overheating—so those effects aren’t the result of too little current. The main consequence of too-low amperage is poor fusion and a rough, ropey bead.

Amperage sets the heat input in GTAW. If it’s too low, the arc doesn’t supply enough heat to melt the base metal (and any filler) properly, so fusion with the joint is poor. The weld pool cools quickly and doesn’t fuse smoothly, producing a bead that is uneven and ropey in appearance. Porosity comes from shielding gas issues or contamination, crater cracks from excessive or uneven cooling, and tungsten oxidation from overheating—so those effects aren’t the result of too little current. The main consequence of too-low amperage is poor fusion and a rough, ropey bead.

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