KT Group Members

Welding Instruction

1. Clean the surface of the base metal before welding.
2. It is difficult for welding in V & O-H positions, so F welding is recommended.
3. Baking temperature should be between 350~400°C during 30~60 minutes before welding. No PWHT is required for base metal.
4. To avoid weave arc, make a short arc in low current.

Typical Chemical Composition of Weld Metal (wt %)

C

Si

Mn

P

S

Ni

Cr

Nb

Fe

Co

0.060

0.24

3.20

0.006

0.007

71.13

14.52

2.21

9.23

0.11

Typical Mechanical Properties of Weld Metal

Tensile Strength

N/mm²（kgf/mm²）

Yield Strength

N/mm²（kgf/mm²）

Elongation

%

Charpy V-Notch

°C

J（Kgf-m）

630(64.2)

420(42.8)

42

-196

89(9.1)

Size and Suggested Operating Range (DC+)

Diameter (mm) x Length(mm)

2.6x300

3.2x350

4.0x350

4.8x350

Amp

H

60~85

80~120

100~150

140~180

V/O-H

55~85

65~110

85~135

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