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Specifically designed for welding low carbon steel structures. It excels in thin plate steel welding, short discontinuous welds, and applications requiring a smooth, aesthetic welding pass.
J421 is a premium rutile type electrode. Compatible with both AC and DC power sources, it supports all-position welding. Key features include a stable arc, minimal spatter, effortless slag removal, and excellent reignition-ability.
| Items | C | Mn | Si | S | P | Ni | Cr | Mo | V |
|---|---|---|---|---|---|---|---|---|---|
| Requirements | ≤0.10 | 0.32-0.55 | ≤0.30 | ≤0.030 | ≤0.035 | ≤0.30 | ≤0.20 | ≤0.30 | ≤0.08 |
| Typical Results | 0.08 | 0.37 | 0.18 | 0.020 | 0.025 | 0.030 | 0.035 | 0.005 | 0.004 |
| Items | Tensile Strength (Rm/MPa) | Yield Strength (Rel/Rp0.2 MPa) | Elongation (A/%) | Charpy V-Notch (KV2/J) 0℃ |
|---|---|---|---|---|
| Requirements | 440-560 | ≥355 | ≥22 | ≥47 |
| Typical Results | 500 | 430 | 27 | 80 |
In general, there is no need to re-dry the electrode before welding. However, if the electrodes are affected by dampness, they should be re-dried at 150℃-170℃ for 0.5 to 1 hour to ensure optimal performance.