Instruction and Application: Austenitic-tiesu body welding of duplex stainless steel, used with electro-slag type flux SJ27B. Metal cladding with austenite-ferrite dual phase structure, excellent performance and corrosion resistance, excellent resistance to pitting and crevice corrosion. Flux process performance, stable welding process, slag off easy, not slag, smooth weld bead surface, fuse good, low dilution rates, high deposition efficiency. Applied with chloride ion corrosion environment of paper, chemicals and other equipment within the tube sheet and double wall surfacing.

Typical Chemical Composition(％)：

Typical Chemical Composition of the all-weld metal(％)

Physical and chemical analysis of the flux(％)

Surfacing layer bending performance: After lateral bending test,the sample surface of the surfacing layer shall not be any greater than 1.5mm gap,above the fusion line shall not be any greater than 3mm gap.

Surfacing layer of non-destructive testing: Ultrasonic testing and penetration testing, According to the provisions of NB/T 470130 test results should not be any cracks and lack of fusion.

Reference range:(DC+)

Notice:

1.Redry the flux at 300℃-350℃ for 1hours.

2.The welding consumables surface rust, oil and other impurities must be cleaned up.

3.The base metal should be preheated to 150 ° C before welding. The interpass temperature should be below 250℃.

4.To ensure the quality of welding, the thickness of the transition layer should be guaranteed between 3.0 and 3.5mm, the corrosion layer thickness must be maintained between 3.5-4.0mm.

5.Appropriate the surfacing position to the level to about 2 º uphill welding.