Narrow-gap submerged arc flux used for nuclear power SA508 Gr.3 Cl.1 steel welding was introduced on slag system selection

formula designation

and product performance. It was welded with the special alloy wire in wide welding parameters

their welding process performance adaptability and stability of mechanical properties in PWHT were researched. The results showed that

flux CHF112 HRF had excellent welding process performance adaptabilities. When welded variably in wide welding currents

welding speed

interpass temperatures

mechanical properties of deposited metal in PWHT met the technical requirements of the third generation nuclear power completely

and the values had sufficient margins and less fluctuations. The microstructure of deposited metal was granular bainite and ferrite.