E7024 welding rod
Tensile strength ≥70ksi, meeting mechanical property standards.
Stable arc, low spatter, good slag detachability, nice weld bead.
Suitable for flat/horizontal welding, with high-efficiency filling.
Used in carbon steel welding (construction, shipbuilding, etc.).
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Products Description
The E7024 electrode is an iron-powder-titanium coated electrode that complies with AWS A5.1 standards. It is designed for flat and horizontal fillet welding and can be used in both AC and DC applications. Its core advantage is that each kilogram of electrode produces 1.5 kilograms of weld metal, increasing welding productivity by 50% compared to traditional electrodes. It is particularly suitable for welding large-area and thick steel structures. The deposited metal has a tensile strength of ≥490 MPa, and the fracture site in tensile tests is always located within the base metal. The impact energy is ≥34 J at -20°C, achieving a balance of strength and toughness, meeting the stringent requirements of heavy-duty structures such as bridges and industrial buildings.
Core Advantages
1. Industry-leading deposition efficiency, 30% shorter construction time.
The E7024 coating incorporates a high percentage of iron powder, depositing an additional 1.2 kg of weld material per hour (using a 4.0 mm diameter electrode as an example). In a heavy-duty bridge steel structure project, the welding schedule for 27,500 tons of main structural components was shortened by 28 days compared to the original plan, directly reducing labor costs by over 1.2 million yuan.
2. Stable process performance, enabling even novice welders to produce high-quality welds.
Arc characteristics: Current fluctuations of ±10A remain stable, and the weld pool condition can be assessed on-site by listening to the arc's "rustling" sound (ideally, a continuous crackling sound similar to "frying bacon"). Spatter is reduced by 40% compared to the E7018, and post-weld cleanup time is shortened by 50%.
Slag removal: The slag is glassy, with an automatic shedding rate of ≥95%. The first-pass weld pass rate for a large industrial plant pipe truss project has increased from 92% to 98.3%. Beautiful shape: The weld wave is delicate and the residual height is controlled at 1-2mm, and the appearance acceptance standard can be met without secondary grinding.
3.Differentiation Comparison With E7018.
| item | E7024 | E7018 |
|---|---|---|
| Applicable Locations | Flat welding, horizontal fillet welding | All-position welding |
| Actual Deposition Rate | 1.5kg weld/kg welding rod | 0.93kg weld/kg welding rod |
| Current Range | 120-250A (diameter 3.2-5.0mm) | 90-180A (diameter 3.2-4.0mm) |
| Optimal Scenario | Large area steel structure welding | Welding of important pressure parts |
Technical Parameters
Mechanical properties (AWS A5.1 standard)
| item | min | Measured value | Acceptance criteria |
|---|---|---|---|
| tensile strength | 490MPa | 510MPa | The fracture position is located in the parent material |
| Yield strength | 400MPa | 450MPa | Yield point elongation ≥ 0.2% |
| Impact energy | 34J | 42J | -20℃ Charpy V-notch test |
Welding parameters
| Electrode diameter | Current range (AC/DC) | Welding speed | Applicable scenarios |
|---|---|---|---|
| 3.2mm | 120-150A | 15-20cm/min | Thin plate splicing, fillet welds |
| 4.0mm | 160-200A | 12-18cm/min | Medium and thick plate welding, main beam connections |
| 5.0mm | 220-250A | 10-15cm/min | Heavy-duty structures, long-span trusses |
FAQ
Q1: How can I avoid burn-through when welding thin plates?
A: Use a 3.2mm electrode, control the current to 120-140A, employ the "broken arc welding" technique (dwell for 0.5 seconds between weld points), and maintain a welding speed of 15-20cm/min.
Q2: Can E7024 and E7018 be mixed?
A: Not recommended. The difference in deposited metal composition between the two electrodes will result in uneven weld mechanical properties and a potential 15-20% decrease in impact energy.
Q3: How should damp welding rods be handled?
A: Dry at 150-200°C for one hour, then place in an insulated container at 80-100°C. If not used within 4 hours, re-dry (up to twice).
Q4: How can I reduce spatter during high-altitude welding?
A: Reduce the current by 5-10A, weld at a "downhill" angle (10-15°), and place a magnetic slag tray underneath in advance.
Safety Operating Procedures
Smoke and Dust Protection: Local exhaust ventilation (air volume ≥ 2000 m³/h) must be enabled when wind speed at the work site is < 2 m/s.
Electric Shock Prevention: The secondary side of the welding machine must maintain no-load voltage ≤ 80 V. Use insulating gloves (voltage resistance ≥ 500 V).
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