Duplex stainless steel has good welding properties. Compared with ferritic stainless steel and austenitic stainless steel, it is neither like the welding heat-affected zone of ferritic stainless steel, which greatly reduces the ductility and toughness due to severe grain coarsening, nor is it like austenitic stainless steel That is sensitive to welding heat cracks.
Welding characteristics of duplex stainless steel
Due to its special advantages, duplex stainless steel is widely used in petrochemical equipment, seawater and wastewater treatment equipment, oil and gas pipelines, paper machinery and other industrial fields. In recent years, duplex stainless steel has also been researched and applied in the field of bridge load-bearing structures, and has a good development prospect.
Welding characteristics of duplex stainless steel
From a metallographic point of view, there is no problem with welding 2101 (1.4162) at all. In fact, welding is easier than standard grade duplex steel, because this material can actually be welded by the acetylene welding process, which must be avoided for standard duplex steel materials. The actual problem facing welding 2101 is that the viscosity of the molten pool is different, so the wettability is slightly lower. This forces the operator to use arc welding more frequently during the welding process, which is the problem. Although it can be composed by selecting high-temperature alloy welding materials, we often want to choose matching welding materials.
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