KT Group Members

Welding Instruction

1. Dry the electrodes at 300-350°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

W

V

0.650

0.88

0.90

5.25

1.20

1.44

0.55

Typical Hardness of Weld Metal

        Hardness

Condition

Vicker’s hardness

（HV）

Rockwell’s hardness

（HRC）

Shore’s hardness

（HS）

Interpass temp. ≤150°C

650

58

77

600℃ PWHT

580

54

73

Hardness at 400°C

485

48

65

Hardness at 600°C

375

38

52

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