KT Group Members

Applications and Features

(1)     KFX-71M is suitable for welding 490N/mm² grade steel.

(2)     Good mechanical properties, crack resistance, less fume, stable arc, good slag removal, good bead appearance and excellent X-ray quality welds.

(3)     Ideal for welding ship-building, tank, construction machine, steel structure and bridge.

Welding position

Welding Instruction

Please refer to Appendix D.

Typical Chemical Composition of Weld Metal (wt%)

Shielding Gas

C

Si

Mn

P

S

C1

0.04

0.714

1.33

0.0155

0.0107

M21

0.03

0.722

1.57

0.0136

0.0085

Typical Mechanical Properties of Weld Metal

Shielding Gas

Tensile Strength
N/mm²

Yield Strength

N/mm²

Elongation

%

Charpy V-Notch

℃

J

C1

612

585

28

-20

89

M21

650

594

26

-20

75

Size and Suggested Operating Range (DC+)

Diameter (mm)

1.2

1.4

1.6

F/HF

140~300A/23~36V

150~350A/22~34V

200~450A/28~42V

H

140~280A/22~33V

150~280A/22~32V

220~280A/23~29V

V-up/OH

140~220A/22~28V

150~230A/22~28V

160~280A/22~28V