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Select the welding material of duplex stainless steel

2022-01-24 16:33:08

The welding material for duplex stainless steel is characterized in that the welding seam is duplex structure dominated by Austenite, and the content of main corrosion resistant elements (CR, MO, etc. . In order to ensure the content of Austenite in the weld, the content of nickel and nitrogen is usually increased, that is, about 2% ~ 4% of nickel equivalent. In duplex stainless steel base metal, there is usually a certain amount of nitrogen content, in welding materials also want to have a certain amount of nitrogen content, but generally should not be too high, otherwise there will be blowhole. This higher nickel content makes a major difference between the welding material and the base material. According to the different requirements of corrosion resistance and joint toughness, the electrode matching the base metal chemical composition, such as welding Cr22 dual-phase stainless steel, can choose Cr22Ni9Mo3 electrode, such as E2209 electrode. When acid electrode is used, the slag removal is good, the weld is beautiful, but the impact toughness is low. When the weld metal is required to have high impact toughness and all position welding, the basic electrode should be used. When the root of the back welding, usually the use of alkaline electrode. When the Corrosion Resistance of weld metal has special requirements, should also be used super dual-phase steel composition of the basic electrode. For solid Gas metal arc welding wire, while ensuring good corrosion resistance and Mechanical Properties of Weld Metal, attention should also be paid to its welding technological properties. For Flux cored Wire, when the weld appearance is required, rutile type or titanium-calcium type flux-cored wire can be used. When high impact toughness is required or when welding under high restraint condition, high alkalinity flux-cored wire should be used. For submerged ARC welding, smaller diameter wire should be used to realize multi-layer and multi-pass welding under small and medium welding specification to prevent embrittlement of heat affected zone and weld metal.

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