TOKO AWS A5.17 EM12K Submerged Arc Welding Wire

1. Key Specifications:

• AWS Classification: Compliant with AWS A5.17 EM12K, indicating a medium-manganese, silicon-killed carbon steel wire designed for submerged arc welding.
• Chemical Composition:
• Carbon (C): ~0.10–0.15%
• Manganese (Mn): ~1.25–1.75%
• Silicon (Si): ~0.30–0.60% (enhanced deoxidation for cleaner welds).
• Low sulfur (S) and phosphorus (P) for reduced cracking risk.
• Flux Compatibility: Pairs with neutral or active fluxes (e.g., TOKO’s agglomerated/fluxes like F7A2-EM12K or F6A2-EM12K) to control weld metal properties.

2. Welding Performance

• Deposition Efficiency: High deposition rates (~8–12 kg/hr), ideal for thick-section welding.
• Arc Stability: Smooth, consistent arc with minimal spatter.
• Penetration Profile: Balanced penetration (medium depth), suitable for multi-pass welds.
• Weld Metal Cleanliness: Silicon content ensures effective deoxidation, minimizing porosity on oxidized or scaled steel.

3. Technical Specifications

• Wire Diameters: 2.0mm to 6.4mm (common sizes: 2.4mm, 3.2mm, 4.0mm).
• Current Types: AC or DC (typically DC+ for better penetration).
• Typical Applications:
• Current Range: 300–1,000A (depends on diameter and flux).
• Voltage: 28–34V.
• Mechanical Properties (with matched flux):
• Tensile Strength: 415–550 MPa.
• Yield Strength: ≥330 MPa.
• Elongation: ≥22%.
• Impact Toughness: ≥27J at -30°C (flux-dependent).

4. Applications

• Industries: Heavy fabrication, shipbuilding, pressure vessels, structural steel (beams, bridges), and pipeline welding.
• Material Compatibility:
• Carbon steels (ASTM A36, A516).
• High-strength low-alloy (HSLA) steels (e.g., ASTM A572).
• Joint Types: Butt, fillet, and groove welds in flat/horizontal positions (SAW’s typical limitations).

5. Advantages

• High Productivity: Automated welding with fast travel speeds and minimal downtime.
• Weld Quality: Excellent X-ray quality with low hydrogen levels (flux-dependent).
• Versatility: Works with multiple flux types to tailor weld metal chemistry (e.g., toughness, strength).
• Certifications: Meets ABS, DNV, and ASME standards for marine and pressure vessel use.

Comparison to Similar Wires

When to Choose EM12K

✅ Thick-section welding (≥10mm steel plates).
✅ High-volume production requiring automation.
✅ Demanding environments (shipyards, structural fabrication).
✅ Cost-effective solution for carbon/HSLA steels.

Storage & Handling

• Store wire in dry conditions to prevent rust.
• Re-dry fluxes at 300–350°C for 1–2 hours if exposed to humidity.