KT Group Members

Welding Position

All Positions

Welding Instruction

(1) Clean up the contaminations on the steel.

(2) Dry the electrodes at 350~400°C for 60 minutes before welding.

(3) Keep arc as short as possible. Take the back step method to prevent porosity at arc start and re-start. (Please refer to Appendix A)

(4) High heat input will lower the impact value. Please carefully select the welding current.

(5) The preheat temperature for thick plate is 50~100°C.

Typical Chemical Composition of Weld Metal (wt %)

C

Si

Mn

P

S

Ni

0.060

0.52

0.88

0.010

0.008

0.93

Typical Mechanical Properties of Weld Metal (As welded)

Tensile Strength

N/mm²(kgf/mm²)

Yield Strength

N/mm²(kgf/mm²)

Elongation

%

Charpy V-Notch

°C

J (kgf -m)

560(57.1)

490(50.0)

32

0

—

-40

118(12.0)

Size and Suggested Operating Range (AC or DC+)

Diameter (mm) x Length(mm)

2.6x300

3.2x350

4.0x400

5.0x400

Amp

H

70~100

100~140

140~180

180~230

V-up/OH

60~90

90~130

120~160

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