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How To Weld Duplex Stainless Steel. If using a TIG process for welding duplex stainless steel nitrogen should be added in small quantities to back purging and shielding gases to stabilise the austenite. Duplex stainless steel is a combination of austenitic and ferritic stainless steel.
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Typically 409 or 439 filler material is used to weld ferritic stainless steels. 5 to provide good laboratory-to-laboratory reproducibility on duplex stainless steel weld metals. A post weld heat treatment PWHT at high solutioning temperature 1050-1100 C 1920-2010 F should be performed followed by water quenching.
Steels with over 020 C often require a post weld heat treatment to soften and toughen the weld.
Ad No Min Order. 5 it was shown at least for. No preheating is required although a hot air blower should be used to remove any condensation especially when welding in the morning. Duplex stainless steel is a combination of austenitic and ferritic stainless steel.
