Applicable standards:
- AWS A5.20/ ASME SFA5.20:
- E71T -1C/1M
Features and applications:
- W71T - VD is a flux-cored welding wire that can be welded in any position with CO2 shielding gas . W71T - VD is commonly used in automatic and semi - automatic welding of high - strength low - carbon steel with a tensile strength of 490-670 MPa .
- This welding material is widely used in steel structures , pressure vessels , bridge structures , ships , maintenance and repair , etc.
- The weld has good penetration , high ductility , and good pressure resistance .
- Compared to solid welding wire , flux - cored welding wire produces less spatter , a more stable arc , a cleaner weld bead and surface finish , and less smoke . The flux in the core contributes to improved metallurgical properties and mechanical properties of the weld . The slag cools quickly and is easily removed .
- Manufactured in Vietnam or China.
Chemical composition of the deposited metal layer (%):
| |
C |
Mn |
Si |
S |
P |
| Request |
≤0.12 |
≤1.75 |
≤ 0.9 |
≤ 0.03 |
≤0.03 |
| Achieve |
0.05 |
1.25 |
0.45 |
0.01 |
0.01 |
Mechanical properties of weld metal:
| |
Yield strength
(Mpa) |
Tensile strength
(Mpa) |
Elongation
(%) |
Impact toughness
(J) at -20°C |
| Request |
400≤ |
490≤ |
22≤ |
47≤ |
| Achieve |
430 |
520 |
28 |
110 |
Instructions for use:
- Clean off grease and rust before welding .
- The weld edges are processed according to specifications .
- Choose the appropriate welding current and voltage to avoid defects .
- Maintain a distance of 15-25mm between the workpiece and the soldering iron .
- The protective gas should be 100 % CO2 ( 18-20 liters / minute) .
- Ventilate the welding booth to prevent suffocation from CO2 gas .
- Depending on the purpose , choose the appropriate welding process to ensure a beautiful , smooth weld with good penetration .
- Preheating ( 50 ~ 150° C ) ( 122 ~ 302 ° F ) and allowing it to cool after each pass before welding again is recommended to release hydrogen , which can cause weld cracking when welding thick plates .
- Weld defects such as hot cracking can occur due to improper welding parameter adjustments , such as excessively high welding speeds .
Wire size, specifications, and current usage:
Use a DC positive power supply.
| Diameter (mm) |
Ø 1.0 |
Ø 1.2 |
Ø1.6 |
| Current (A) |
Korean |
50~250 |
110~300 |
180~450 |
| Han standing |
60~200 |
180~280 |
230~320 |
| Han Tran |
50~150 |
110~260 |
180~280 |
Certified by: VR, NK
ENG
