During TIG welding operations, it is indeed possible for tungsten electrodes to stick to the weldment, but this is usually an abnormal phenomenon and is mainly caused by the following reasons:
The Electrode Is In Contact With The Workpiece
If the arcing method is contact arcing, the electrode head is in brief contact with the workpiece, but if the operation is improper or the electrode is not lifted in time, it is easy to cause the electrode to stick to the workpiece.
Excessive Current
Excessive welding current can cause the terminal head temperature to be too high, increasing the risk of sticking to the weld pool.
Insufficient Or Abnormal Flow Direction of The Shielding Gas
The shielding gas does not effectively isolate the electrode and air, causing the electrode surface to oxidize or stick to the melt pool.
The Electrode Tip Is Improperly Shaped
If the end is too blunt or improperly polished, it will make the arc unstable and increase the possibility of contact between the electrode and the melt pool.
Unskilled Welding Operation
The position of the electrode is improperly controlled during the welding process, which is easy to touch the melt pool and cause sticking.
Generally, methods to avoid electrode sticking include reasonably adjusting the welding current and gas flow, keeping the electrode head in an appropriate shape, using non-contact high-frequency arcing, and avoiding the electrode from touching the melt pool during operation. Once adhesion occurs, the power supply should be disconnected immediately, and the electrode should be gently separated after cooling to prevent the electrode from breaking.
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