Although tungsten electrodes are non-melting electrodes in argon arc welding, their performance will still deteriorate due to various reasons during actual use, and they need to be replaced in time to ensure welding quality and safety. The following situations are typical signs of replacing a tungsten electrode:
The electrode tip is severely ablated or deformed
During welding, high temperature will gradually burn out the electrode head, resulting in significant shortening, dullness or irregular shape, resulting in arc instability and difficulty in arcing.
The electrode head adheres to solder slag or metal splash
The electrode head is stained with welding slag, splashes or polluted by the workpiece material, which can easily cause arc offset or even tungsten inclusions, affecting the quality of the weld.
Cracks or peeling appear on the surface of the electrodes
Mechanical impact or overheating can cause cracks, peeling, or chipping on the electrode surface, reducing mechanical strength and durability.
The electrode size is significantly shortened
When the electrode length is reduced due to ablation to the point where it cannot be installed normally or meets the welding depth, it should be replaced in time.
The arcing performance is significantly reduced
If the electrode is used for too long, the arc voltage will increase, the arc will be unstable, and the welding effect will deteriorate.
Radiosafety considerations (for thorium tungsten electrodes)
When the thorium tungsten electrode is severely worn or damaged, in order to avoid radioactive contamination, the waste electrode should be replaced in time and properly disposed of.
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