Duplex steel is made up of two distinct microstructures: ferrite and austenite, which makes it more difficult to weld than other types of stainless steel. This article provides a comprehensive guide to welding duplex stainless steel pipe so that you can make the most use of your work.
How to Weld Duplex Stainless Steel Pipe:
Specialized skills and attention are required when welding duplex stainless steel as dss is harder than regular stainless steel. Welders need to follow the joint designs recommended by the manufacturer and use proper welding techniques. It’s also necessary to choose filler materials that match or exceed the sensitization standards of the actual alloy being used. Appropriately preheating between two welding layers can avoid crackingcaused by thermal shock. Finally, post weld heat treatment should be used as needed in order to remove any potential stresses built up during the welding process and obtain optimum corrosion resistance and strength of the complete structure.
Duplex Stainless Steel Pipe Welding Procedure:
Preheat→Set Up the Welding Machine→Tack Weld→Weld→Post Weld Heat Treatment→Cool Down→Inspect the Weldment
Duplex Stainless Steel Welding Methods:
Welding method is determined by property requirements, positional weldability and productivity. The following are common welding methods of duplex stainless steel:
- MMAW
- GMAW
- GTAW
- SAW
- FCAW
- Laser, Laser Hybrid and Plasma Welding
