Welding copper is notoriously difficult because of its high thermal conductivity (391 W/mK). However, C10100 Oxygen-Free Electronic (OFE) copper is significantly easier to join than standard ETP copper (C11000). The reason is its Max 5ppm oxygen content. In standard copper, oxygen reacts with hydrogen during welding to form internal steam, which causes the weld to crack or become porous. C10100 eliminates this risk, making it the preferred choice for vacuum-tight seals and high-current busbars that require structural integrity.
Why does C10100 weld better than standard copper?
The primary cause of weld failure in copper is Hydrogen Embrittlement . Because C10100 Oxygen-Free Electronic copper is 99.99% pure, there are no cuprous oxides to react with the hydrogen in the welding torch.
This purity also ensures the joint maintains 101% IACS conductivity. If you use the wrong filler or a lower-grade copper, the weld bead becomes a "hotspot" with high resistance, which can lead to system failure under high electrical loads.
Welding Method Selection for C10100
| Method | Suitability | Best For |
| TIG (GTAW) | Excellent | Precision joints and C10100 Tubes |
| MIG (GMAW) | Good | High-speed production of C10100 Plates |
| Laser Welding | Excellent | Automated assembly of C10100 Busbars |
| Brazing | Excellent | Dissimilar metal joining (Copper to Steel) |
How do you prevent "cold start" defects in C10100?
Because C10100 pulls heat away from the weld pool so fast, the beginning of the weld often lacks penetration. This is a common C10100 sourcing and fabrication trap.
To fix this, preheating is mandatory for any section thicker than 3mm. Heating the material to 150°C - 250°C reduces the thermal gradient, allowing the weld pool to form properly. Use 100% Argon or an Argon-Helium mix for the shielding gas to increase the arc temperature.
FAQ
1. Can I weld C10100 without using a filler rod?
Yes, this is called autogenous welding. It is common for thin C10100 Foils or small tubes. It ensures the joint remains 99.99% pure without introducing any foreign alloys.
2. What happens if I use a standard brass filler rod?
The zinc in the brass will boil off, creating porosity and contaminating the weld. It will also significantly drop the conductivity below the required 101% IACS level. Always use an OF-copper filler rod (ERCu).
3. Do I need to clean the surface before welding?
Absolutely. Even though C10100 is oxygen-free, surface oils and fingerprints will cause porosity. Wipe the surface with isopropyl alcohol or a mild citric acid etch before starting.
4. Is laser welding C10100 difficult?
Copper is highly reflective. However, modern "Green" or "Blue" lasers work perfectly with C10100 because the lack of internal oxides allows for a much more stable and predictable weld keyhole.
5. Why did my C10100 joint crack after cooling?
Cracking is usually due to "hot shortness" or high stress. Ensure the parts are properly jigged but allowed some room for thermal expansion. Also, check the C10100 hardness-harder tempers are more prone to stress cracking than annealed copper.
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GNEE METAL Product Range
| Product Type | Shapes Available | Common Grades | Diameter/Thickness Range | Length/Width Range | Applications |
|---|---|---|---|---|---|
| Copper Tubes | Round, Square, Rectangular, Coiled | C10100, C10200, C11000, C12200, C12000 | OD: 0.5mm - 300mm Wall: 0.1mm - 20mm | Up to 6000mm or custom | HVAC, Plumbing, Heat Exchangers, Refrigeration, Hydraulic Lines |
| Copper Plates & Sheets | Flat Sheets, Perforated, Embossed, Tread Plate | C10100, C11000, C12200, C23000, C26000 | Thickness: 0.1mm - 200mm | Width: Up to 2500mm Length: Up to 6000mm | Electrical Busbars, Roofing, Cladding, Gaskets, Transformers |
| Copper Bars & Rods | Round Bar, Square Bar, Hexagonal Bar, Flat Bar | C10100, C11000, C14500, C17200, C18200 | Diameter: 1mm - 300mm | Length: 1000mm - 4000mm | Machined Components, Electrical Contacts, Busbars, Fasteners |
| Copper Wires | Round Wire, Flat Wire, Square Wire, Stranded, Braided | C11000, C11600, C17200, C17510 | Diameter: 0.05mm - 12mm | Coil weights: 1kg - 500kg | Electrical Wiring, Cables, Springs, Mesh, Welding Wire |
| Copper Strips & Coils | Thin Strip, Foil, Slit Coil, Profile Strip | C11000, C12200, C19400, C26000, C26800 | Thickness: 0.03mm - 5mm | Width: 2mm - 1000mm Coil ID: 300mm - 600mm | Transformers, Radiators, Shielding, Terminals, Connectors |
About Our Factory
We operate a full range of production lines including extrusion presses, cold drawing benches, high-speed rolling mills, slitting lines, and precision CNC machining centers, enabling us to produce copper tubes, plates, bars, wires, and strips entirely in-house. For quality assurance, we maintain a dedicated inspection laboratory equipped with spectral analyzers, universal testing machines, hardness testers, surface roughness testers, and optical measuring instruments. Every batch is tested for chemical composition, mechanical properties, and dimensional accuracy before shipment. Our production capacity reaches 500+ tons per month, and we hold ISO 9001:2015 certification with full traceability from raw material to finished product. Whether you need standard mill stock or custom-processed components, we deliver precision copper products with short lead times and complete material certification.
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