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Nitrogen porosity tendency in weld metal

The sudden exceeding of the solubility limit of nitrogen during the transition from the liquid to the solid phase, resulting in the formation of gas bubbles.

Nitrogen can dissolve in the molten weld metal. If the melt cools too quickly, the nitrogen doesn't have time to escape. Then bubbles and pores form in the weld metal. That makes the weld porous and weakens it. Let the weld cool slowly after welding so the nitrogen can escape. A clean weld pool and proper shielding gas flow are key to keeping nitrogen from the air out. If you treat the structure afterwards, make sure you don't overheat it, that doesn't make things better.

MetallurgieSchweißtechnik

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