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[MW:2703] SS Material purging

By Materials & Welding
Dear Friends,
There are two queries :-

Why it needs pre-heating in welding of SS material. What is to be tsken care in welding SS amterial.

Secondly, It is recommendable in DPT of ss materials, Penetrent should not have or acceptable levels of chlorides and florides. Why? What should be there percentage.

Regards,
puneet


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