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Hydrogen in Weld Metals

Invariably, there is some amount of hydrogen present in the solidified and cooled weld zone. This hydrogen is introduced by the arc heat breaking down the moisture present in and around the welding arc. Possible sources of this moisture include the electrode covering, flux, shielding gas, atmospheric humidity and condensation on the work pieces.
When welding steels, absorbed hydrogen can cause cracking . Therefore, in welding carbon and low alloy steels, martensitic stainless steels, etc., an important consideration in selecting the welding process and filler metals is the amount of hydrogen that might be introduced into the weld zone. Non-ferrous materials react differently to hydrogen.

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