KT Group Members

Welding Instruction

(1) Dry the electrodes at 70-100°C for 30-60 minutes before use.

(2) Clean up the contaminations on the steel to prevent porosity.

(3) Preheat temperature should be above 150°C for multi-layer welding of low alloy steel or high carbon steel.

(4) Welding parameter and operating technique must be carefully chosen to prevent slag inclusion in narrow gaps welding.

Typical Chemical Composition of Weld Metal (wt. %)

C

Si

Mn

Cr

0.150

0.50

0.58

1.25

Typical Hardness of Weld Metal

        Hardness

Condition

Vicker’s hardness

（HV）

Rockwell’s hardness

（HRC）

Shore’s hardness

（HS）

Interpass temp. Temp. ≤150°C

260

24

37

Continuous build-up

220

16

33

Size and Suggested Operating Range (AC or DC+)

Diameter x Length(mm)

2.0x250

2.6x300

3.2x350

4.0x350

5.0x350

Amp

35~55

50~85

80~120

100~150

140~200