Tungsten electrode burn-through refers to the phenomenon that the tungsten electrode is partially or completely melted and perforated due to overheating or improper operation during argon arc welding (TIG welding).
Specifically, It Is Manifested As:
Holes or cracks appear at the electrode end, or even the entire electrode tip is ablated and broken;
The electrode shape is severely damaged and cannot maintain a stable arc;
During the welding process, the arc is unstable, arcing is difficult, and the weld quality is reduced.
It can lead to tungsten inclusions, welding defects, or weld interruptions.
The Main Causes Of Burn-out Include:
The welding current is too large, exceeding the electrode tolerance range;
Insufficient flow rate of protective gas or many gas impurities, resulting in aggravated electrode oxidation;
The electrode polarity is incorrect, causing excessive heating of the electrode terminal;
Improper arcing method, such as frequent contact with arcing causing local high temperature;
The quality or type of tungsten electrode is not suitable for welding conditions.
Methods To Prevent Burnouts:
Reasonable selection of electrode type and diameter to match the welding current;
Maintain adequate and pure shielding gas flow;
Correct selection of electrode polarity and arcing mode;
Regularly check and regrind the electrode in time to keep the end in good shape;
Avoid direct contact of the electrode with the workpiece or the weld pool.
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