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51312-01250-Influence of Welding and Post-Weld Cleaning on Performance of Duplex Stainless Steels

Picture for Influence of Welding and Post-Weld Cleaning on Performance of Duplex Stainless Steels
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Product Number: 51312-01250-SG
ISBN: 01250 2012 CP
Author: John F. Grubb
Publication Date: 2012
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The corrosion resistance of welded stainless steel depends on a number of factors including selection of proper weld procedures selection of welding filler metal and post weld surface treatment. Guidance on stainless steel fabrication gives great attention to the first two items while giving little practical guidance on post weld clean-up. Pickling of welds is a commonly specified post weld clean-up procedure but cost and environmental considerations lead many to skip or modify the process. Sufficient time must be allowed to dissolve heat tint or other contaminants introduced during welding. Duplex stainless steels which may rely on chromium for more of their resistance to pitting may be more affected by improper post-weld cleaning than other stainless steels. Data show large increases in pitting breakdown potential with longer pickling times. There is also a benefit of mechanical surface treatments with or without a pickling treatment. The welding process and procedures used may have some bearing on the results obtained. In an extreme case as welded unpickled 2205 duplex stainless steel did not show any passive behavior whatsoever. For maximum pitting resistance a mechanical surface treatment followed by pickling is required.
The corrosion resistance of welded stainless steel depends on a number of factors including selection of proper weld procedures selection of welding filler metal and post weld surface treatment. Guidance on stainless steel fabrication gives great attention to the first two items while giving little practical guidance on post weld clean-up. Pickling of welds is a commonly specified post weld clean-up procedure but cost and environmental considerations lead many to skip or modify the process. Sufficient time must be allowed to dissolve heat tint or other contaminants introduced during welding. Duplex stainless steels which may rely on chromium for more of their resistance to pitting may be more affected by improper post-weld cleaning than other stainless steels. Data show large increases in pitting breakdown potential with longer pickling times. There is also a benefit of mechanical surface treatments with or without a pickling treatment. The welding process and procedures used may have some bearing on the results obtained. In an extreme case as welded unpickled 2205 duplex stainless steel did not show any passive behavior whatsoever. For maximum pitting resistance a mechanical surface treatment followed by pickling is required.
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