Submerged Arc Welding (SAW) for Duplex Stainless Steels
Submerged Arc Welding allows the deposition of relatively large welds with less total time at temperature for the HAZ than would be possible for a large number of passes with less deposition per pass. Because of the ferritic solidification and duplex transformation of the weld metal, the duplex stainless steels can be SAW with minimal risk of hot cracking. However, it is necessary to make some adjustment of joint design or welding parameters relative to austenitic stainless steels to obtain full penetration welds. For large constructions and for large straight runs of weld, SAW is a cost efficient and technically satisfactory approach to welding duplex stainless steels. SAW is commonly used to manufacture heavy wall duplex stainless steel pipe.
Filler Metals and Shielding
For SAW, the usual matching duplex filler metal is appropriate. However, it is important to select a correct flux to achieve the desired properties. It is reported that highly basic fluxes give the best impact toughness for the duplex stainless steels.
Technique and Parameters
Typical parameters for SAW duplex stainless steel are summarized in Table 17.
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tags: Arc, duplex, duplex stainless steel, duplex stainless steels, impact toughness, SAW, stainless steels, Submerged Arc Welding, weld
