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Tungsten electrode TIG weld porosity Cause

Tungsten  electrode welding with argon as a protective gas, an arc melt and a  welding method produces filler material between the tungsten electrode  and the workpiece. The main causes of porosity are:

(1) base metal before welding surface cleaning is not sufficient, some residual oil, water and rust.

(2) insufficient purity argon, resulting in harmful gases mixed in the bath.

(3) the torch outlet of a foreign body obstruction, poor airflow, shielding gas flow decreases.

Improper (4) draft measures, such as welding places have drafts, undermining the protection of the air shroud.

(5) air supply pipe leakage phenomenon.

(6) tungsten electrodes rolling head or rolling head sleeve is burning arc, resulting in the protection of turbulence.

(7) welding arc is too long, resulting in effective protection from the hood is not enough.

(8) tungsten electrode extends too long, resulting in effective protection from the hood is not enough.

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