Welding Carbon Steel To Duplex. Duplex and superduplex stainless steels may be welded to carbon steels using one of a range of consumable types. Low carbon and low alloy steels may be welded to duplex steels using either a 309L 23Cr13Ni or a 309MoL filler metal.
In single sided welding the entire tack must be ground away before welding. However critical steps must be taken to maximize both corrosion resistance and mechanical properties. Shielding gas plays an important role in welding of duplex stainless steels.
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The biggest characteristic of duplex stainless steel welding is the influence of welding thermal cycle on the microstructure of joint. Shielding gas plays an important role in welding of duplex stainless steels. Where maximum results are necessary such as in corrosive service applications selecting the proper base material and weld filler metal alone will not guarantee success. Solidification hot cracking risk is reduced by the adequate presence of ferrite.