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Welding between dissimilar metals

It is correct to make a continuous welding between a stainless steel and galvanized steel sheets?

Luis A Alvarez
- Daytona Beach, Florida
2007

This sounds like a VERY bad idea for a great many reasons.
Not least, galvanised sheet is never welded because of the zinc fumes which are given off, it also destroys the galvanising in the joint area. The mix of metals resulting from the proposed joint sounds like a corrosion nightmare.

Geoff Smith
Hampshire, England
2007

Another reason why it is a VERY bad idea is that zinc rapidly embrittles austenitic stainless at high temperatures (as in welding & fires). The zinc penetrates grain boundaries and forms NiZn, sometimes causing catastrophic failures.

Ken Vlach [deceased]
- Goleta, California

Finishing.com honored Ken for his countless carefully researched responses. He passed away May 14, 2015.
Rest in peace, Ken. Thank you for your hard work which the finishing world, and we at finishing.com, continue to benefit from.
2007

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