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When nitrogen, oxygen and hydrogen is absorbed in the molten weld pool.
It is released when solidified and becomes trapped in the welded metal.
porosities are caused by unwanted materials or chemicals trapped in molten pool, most of the time nitrogen, hydrogen and oxygen...
If Electrode is not Preheat and moischer is there and wind coming so that causes porosity coming.
Porosity is weld metal contamination in the form of a trapped gas. Shielding gases or gases released as a result of the torch being applied to treated metal are absorbed into the molten metal and released as solidification takes place.
rust or to much spotters;;no good grinding before welding
when welding in an air free enviroment or on painted and oily material, this will cause porosity
by rusty and oily metal surface being weld it can cause porosity
Porosity is caused by the absorption of nitrogen, oxygen and hydrogen in the molten weld pool which is then released on solidification to become trapped in the weld metal.
Air or if the cylinder is out of gas.
porosity is as a result of entrapped gas in a weld. it is caused by damp electrode. to prevent it electrode should be heated before welding.
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