KT Group Members

Welding Instruction

1. Dry the electrodes at 200-250°C for 30-60 minutes before use.
2. Preheat temperature should be ≥ 200°C and PWHT should be 600°C.
3. Use high tensile strength low hydrogen electrode for the buffer layer in multi-layer build-up and base metal with high hardenability.

Typical Chemical Composition of Weld Metal (wt. %)

C

Si

Mn

Cr

Mo

V

0.470

0.28

0.38

5.93

1.33

0.48

Typical Hardness of Weld Metal

        Hardness

Condition

Vicker’s hardness

（HV）

Rockwell’s hardness

（HRC）

Shore’s hardness

（HS）

Interpass temp. ≤150°C

670

59

79

Continuous build-up

650

57

77

Size and Suggested Operating Range (AC or DC+)

Diameter x Length(mm)

3.2x350

4.0x350

5.0x350

6.0X400

Amp

80~120

120~170

160~210

200~280