KH-SLB钴基焊条ECoCr-B耐磨焊条

Welding Instruction

 (1) The dilution rate deteriorates the hardness and corrosion resistance.

(2) Dragging a 90-degree angle or a short arc can reduce the dilution of weld metal.

(3) Preheat and Int. temperature should be 400~500°C. Use slow cooling after welding to prevent cracks.

(4) Dry the electrodes at 200-250°C for 30-60 minutes before use.

Typical Chemical Composition of Weld metal (wt. %)

C

Si

Mn

Cr

W

Fe

Co

1.350

0.93

1.36

31.78

7.86

0.82

bal.

Typical Hardness of Weld metal

As-welded hardness（HRC）

High temperature hardness（HRC）

Continuous build-up

Interpass temp.

100°C

Preheat 200°C

Continuous build-up

300°C

400°C

500°C

43

44

42.5

47

45

40