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Why can austenitic stainless steel welds be magnetic?

April 26, 2017austenitic MAGNETIC stainless steel welds

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Why can austenitic stainless steel welds be magnetic?

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To make a sound weld, without hot cracking, it is generally desirable to have a small amount of ferrite in the weld metal, approximately 3-5%. This ferrite presence may be sufficiently high enough to cause the weld joint to be slightly magnetic.