Influence of Multiple Repairs on the Quality of Duplex Welded Joints

Duplex stainless steels (DSSs) find increasing use as a substitution to austenitic in oil, gas and petrochemical industries, particularly aggressive environments. with appropriate controlled ferrite-austenite balance combine the attractive properties of excellent strength, general corrosion performance adequate weldability. All welding joints subjected regulation must be before commissioning pipeline even hydrostatic tests; all not acceptable defects detected non-destructive testing (NDT) control methods eliminated. In some cases, several successive repairs are often preferred part replacement due lack experience welder performing or expertise controller ensuring application procedure. The purpose this work is study influence on same joint microstructure mechanical heat-affected zone duplex steel 22% chromium joints. For purpose, cylindrical specimen prepared, which various carried out. Then, an NDT main micrographic tests conducted. results obtained after four revealed that multiple made did affect quality