Tungsten inclusions during welding refer to particles or debris mixed with tungsten electrodes in the weld or welding metal, resulting in inclusions inside the weld seam, affecting the welding quality and mechanical properties. The main reasons for tungsten inclusions are as follows:
The Electrode Is Overheated Or Ablated
When the welding current is too high or the shielding gas flow is insufficient, the temperature of the tungsten electrode is too high, causing the tungsten material to melt or splash and enter the weld pool to form inclusions.
The Electrode Is In Contact With The Workpiece
Improper operation leads to direct contact between the tungsten electrode and the weld or the weld pool, which can easily cause the tungsten particles on the surface of the electrode to fall off and mix into the melt pool.
The Electrode Is Improperly Sharpened Or The End Is Broken
Improper shape of the tungsten electrode tip (e.g., too dull, burrs) or cracks can affect the arc stability and increase the risk of tungsten particles peeling off.
Insufficient Quality Or Flow Of The Protective Gas
Insufficient shielding gas or too many impurities lead to aggravated oxidation in the welding area, contamination and ablation of the electrode terminal, and increased tungsten inclusions.
Improper Arcing
When using contact arcing, the electrode is easy to adhere to the surface of the workpiece, and the tungsten particles peel off more when the arc is pulled.
Unstable Welding Operation
If the welder is not skilled in operation, the distance between the electrode and the workpiece is unstable, and the arc runout is frequent, which will also cause tungsten inclusions.
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