Description
Characteristics:
LFC-715 is a flux-cored wire design to be use with CO₂ or Ar/CO₂ gas mixture. It can be used on all-position welding on 490N/mm² high tensile steel. It can obtain better impact toughness than E71T-5 in low temperature.
Applications:
It is widely used for shipbuilding, structural fabrication and machinery.
Notes on Usage:
1. Use DC(+) polarity.
2. Use C02 as shielding gas.
3. In order to get enough penetration in the down hand weld position, maintain a little bit higher welding speed by stringer manipulation for the first pass.
4. Keep inter-pass temperature under 150℃ whiling in multiple-pass welding.
Classification:
AWS A5.20 E71T-5C/5M
EN EN758 T 46 3 P C/M 1
Welding Position:
Typical chemical composition of weld metal (wt%)
| C | Mn | Si | P | S |
| 0.05 | 1.45 | 0.50 | 0.015 | 0.007 |
Typical mechanical properties of weld metal
| YP N/mm² | TS N/mm² | EL % | IV -30°C J |
| 510 | 570 | 29 | 65 |
Sizes and recommended current range ( DC+)
| Diameter (mm) | 1.2 | 1.6 | ||
| Welding Position | F | V-UP | F | V-UP |
| Voltage (Volt) | 30-34 | 25-26 | 30-40 | 26-28 |
| Current (Amp) | 250-300 | 150-220 | 300-400 | 160-220 |
| Stick out (mm) | 10-15 | 10-15 | 15-30 | 15-30 |
| Flow rate (l/min) | 15-25 | 15-25 | 15-25 | 15-25 |
| Weight per spool (kg) | 15 | 15 | ||
