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Re: Welding Muffler
Skypirate is correct.
Your have to back purge with argon to get rid of the oxegen. Porosity nad cracking with happen otherwise especially on used SS material.
Best advice is take to a knowledgable Tig Welder and if he does not think back purging is important then he either does not know or wants to to come back for more money when it cracks again.
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