TOKO AWS A5.17 EM12K Submerged Arc Welding Wire
Precision-engineered carbon steel wire for automatic and semi-automatic SAW applications. Formulated to provide smooth arc action, easy slag release, and excellent mechanical properties with standard fluxes like F7A2, F7A4, F6A2.
Key Advantages
- AWS A5.17 EM12K compliant — full traceability with certified chemical and mechanicals.
- Optimized manganese (1.25–1.75%) & silicon (0.30–0.60%) — ensures sound welds with minimal porosity.
- High deposition rates — up to 12 kg/hr for maximum productivity in heavy plate welding.
- Excellent flux compatibility — performs with agglomerated fluxes (F7A2, F7A0, F6A2).
- Superior bead appearance & slag detachability — reduces post-weld cleaning.
- Available diameters: 2.0mm (5/64"), 2.4mm (3/32"), 3.2mm (1/8"), 4.0mm (5/32"), 5.0mm, 6.4mm (1/4").
Performance Benefits for Heavy Fabrication
- Arc Stability: Smooth and consistent arc with minimal spatter under the flux.
- Weld Profile: Convex to flat bead, excellent for multi-pass.
- Slag Release: Self-peeling or easily removed by light brushing.
- Mechanicals: High yield (≥330 MPa) and good low-temperature impact (≥27J @ -30°C).
- Current Capacity: Handles up to 1000A with DC+ or AC.
Flux Compatibility & Classifications
TOKO EM12K is designed to work with a wide range of neutral and active fluxes. Below are common matched classifications:
🔹 F7A2-EM12K
- Flux type: Agglomerated, neutral
- Tensile: 415–550 MPa
- Impact: ≥27J @ -20°C
- Best for: Shipbuilding, structural, general fab
🔸 F7A4-EM12K
- Flux type: Active / alloying
- Tensile: 480–660 MPa
- Impact: ≥27J @ -40°C
- Best for: Higher strength, offshore, low-temp
Also available with F6A2-EM12K for general applications where lower strength is acceptable. Contact TOKO for specific flux-wire combination test reports.
Primary Industrial Applications
EM12K is the workhorse wire for fabricators worldwide — from heavy plate rolling mills to offshore jacket fabrication.
Offshore Platforms
Jacket structures, topsides modules — used with F7A4 flux for improved toughness.
Shipbuilding
Flat and horizontal butt welds on hull plates, stiffeners, and decks.
Pressure Vessels
Longitudinal and circumferential seams in carbon steel vessels and storage tanks.
Heavy Structural
Bridge girders, box columns, wind turbine towers — high deposition on thick sections.
Additional Applications & Industries
- Pipe mills (LSAW, spiral pipe)
- Railcar manufacturing
- Heavy equipment (excavator arms, crane booms)
- Hydraulic turbine fabrication
- Rebuilding of heavy machinery
- Nuclear containment (non-core) structures
- Lock gates and flood defence systems
Technical Specifications (Typical)
Chemical Composition (%, single values are max)
| C | Mn | Si | P | S |
|---|---|---|---|---|
| 0.10–0.15 | 1.25–1.75 | 0.30–0.60 | ≤0.020 | ≤0.020 |
Copper coating available upon request (typical 0.10–0.35% Cu).
Mechanical Properties (as-welded with neutral flux e.g. F7A2)
| Property | Value |
|---|---|
| Tensile Strength (MPa) | 480–600 |
| Yield Strength (MPa) | ≥360 |
| Elongation (%) | 24–30 |
| Charpy V-notch @ -30°C (J) | ≥40 (typical) |
Recommended Welding Parameters (4.0mm diameter, DC+)
| Current (A) | Voltage (V) | Travel Speed (cm/min) | Stick-out (mm) |
|---|---|---|---|
| 450–650 | 28–32 | 40–70 | 25–35 |
| 650–850 | 30–34 | 35–60 | 30–40 |
Comparison: EM12K vs EM13K
| Feature | EM12K | EM13K |
|---|---|---|
| Manganese Range | 1.25–1.75% | 1.50–2.00% |
| Typical Impact @ -30°C | ≥40 J | ≥60 J (with basic flux) |
| Preferred Application | General fab, shipbuilding | Cryogenic, low-temp offshore |
| Flux Compatibility | Neutral/Active | Basic/Active |
EM13K available upon request for projects requiring enhanced low-temperature toughness.
Storage & Handling
- Wire: Store in original packaging in dry conditions (humidity <60%). Avoid condensation.
- Flux (if supplied separately): Keep sealed; if exposed, re-dry at 300–350°C for 1–2 hours.
- Use clean wire straighteners and contact tips to ensure consistent feed.
Certifications & Technical Docs
Download batch-specific material certificates, SDS, and welding procedure guidelines for TOKO EM12K.
All certifications comply with AWS A5.17 / ASME SFA-5.17 and are third-party verified.