KT Group Members

Welding Instruction

(1) Dry the electrodes at 300-350°C for 30-60 minutes before use.

(2) Clean up the contaminations on the steel. Keep arc as short as possible.

(3) Take the back-step method to prevent porosity at the arc starting.

(4) Preheat and Interpass temperature should be ≥ 150°C.

(5) Use high tensile strength low hydrogen electrode for the buffer layer in multi-layer build-up.

Typical Chemical Composition of Weld Metal (wt. %)

C

Si

Mn

Cr

0.320

0.35

1.30

2.60

Typical Hardness of Weld Metal

        Hardness

Condition

Vicker’s hardness

（HV）

Rockwell’s hardness

（HRC）

Shore’s hardness

（HS）

Interpass temp. ≤150°C

450

45

60

Continuous build-up

400

40

55

Tempering at 600°C

350

35

48

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