What is the effect of amperage being too high in TIG welding?

• A. Increased bead quality
• B. Overheated tungsten and excessive melt-through
• C. Longer arc stability
• D. Better weld control

Answer: (B)

Amperage sets how much heat is put into the weld area. When it’s too high, you’re dumping more heat into the joint than it can safely absorb. That excess heat overheats the non‑consumable tungsten electrode and pushes the weld heat input into the workpiece, increasing the likelihood of burn-through or excessive melt-through, especially on thin materials. The tungsten can also overheat, degrade, or contaminate the weld pool, making control and quality suffer. In short, too much current doesn’t improve the bead or arc stability; it raises the risk of burning through and makes the weld harder to control.