1. EQUIVALENT STANDARD AND CONFORMITY
- Vietnamese standard: TCVN: 3223-2000-431R.
- Vietnamese regulation: QCVN 21:2010/BGTVT-MW2
- American Standard: ASME/AWS E 6013
- Japanese Standard: JIS D4313
2. CHARACTERISTICS AND APPLICATION
- KT-421 cover is made in Titanium system to ensure for good welding process.
- KT-421 is low carbon welding rod suitable for carbon steel weld and low aloy steel with medium load structure such as: industrial workshop structure, machine parts, handrail, iron doors…
- Bright welds, easy to peel, clean peeling slag, lightweight electricity, less smoke, less splash.
- May be welded in any welding position: hammer welding, horizonal welding, ceiling welding…
- Good arc-sensitivities, with maximum stopping time of no less than 60 seconds.
3. PACKAGING SPECIFICATION
| Net weight of box (Kg) |
Net weight of barrel (Kg) |
| Ø2,5 mm |
Ø3,2 – 4,0 mm |
| 2,5 |
5 |
20 |
4. MECHANICAL PROPERTIES OF WELD
| Tensile strength limit (MPa) |
Melting limit (MPa) |
Elongation (%) |
Pendulum impact at 0ºC (J) |
| 430 min |
345 min |
24 min |
50 min |
5. CHEMICAL COMPOSITION OF WELDING METAL LAYER (%)
| C |
Mn |
Si |
P |
S |
| 0.10 max |
0.35~0.55 |
0.35 max |
0.030 max |
0.030 max |
6. DIMENSION OF WELDING RODS AND USED CURRENT (AC & DC)
| Diameter (mm) |
Ø 2.5 |
Ø 3.2 |
Ø 4.0 |
Ø 5.0 |
| Length (mm) |
300 |
350 |
400 |
400 |
| Welding current (Ampe) |
Horisontal welding |
50-90 |
90-140 |
140-190 |
180-240 |
| Vertical welding |
50-80 |
80-130 |
120-180 |
160-210 |
7. INSTRUCTIONS FOR USE
- Fully preparing the elements of labor safety before welding. Welding power source is stable.
- When the welding rod is moist, welding is vulnerable to smoke, splashed and unstable, weld is clarified, need to dry at 100oC – 150oC in 40 – 60 minutes before use.
- Removing all traces of oil, dust and dirt on the surface of the welding material.
- Making sure the weld gap, bevelled edge of welding materials as prescribed to achieve strong weld.
- Selecting the welding line according to the instructions to obtain the deep weld, high working ability.