The weldability of C10100 Oxygen-Free Electronic (OFE) copper is its primary technical advantage over commodity ETP copper. Because C10100 has Max 5ppm oxygen, it is immune to hydrogen embrittlement during high-temperature joining. In commodity copper (C11000), oxygen reacts with hydrogen to form internal steam, causing the joint to fail. For vacuum-tight seals in UHV chambers or high-current busbars, C10100 is the only safe specification for welding or vacuum brazing.
Why is Oxygen Content Critical for Weld Integrity?
In standard welding environments, hydrogen is always present. In lower-grade copper, hydrogen penetrates the metal and reacts with cuprous oxide (Cu2O) to form H2O steam at the grain boundaries. This internal pressure creates micro-fissures.
By using C10100 Oxygen-Free Electronic copper, you eliminate the oxides. This allows for a clean, gas-tight weld bead. This purity is also the driver behind the material's 101% IACS conductivity, ensuring the joint doesn't become a "hotspot" during high-current operation.
Welding Process Compatibility for C10100
| Process | Rating | Technical Note |
| TIG (GTAW) | Excellent | Best for vacuum-tight C10100 Tube |
| MIG (GMAW) | Good | Best for thick C10100 Plate |
| Laser Welding | Excellent | Requires high power due to 391 W/mK conductivity |
| Vacuum Brazing | Excellent | No flux required; maintains 99.99% purity |
What are the parameters for TIG welding C10100?
Because C10100 has a thermal conductivity of 391 W/mK, heat dissipates rapidly away from the weld zone. This requires high heat input or preheating of the material to maintain a stable weld pool.
Shielding Gas: Use 100% Argon or an Argon-Helium mix. Helium increases the heat intensity, which is necessary for thick C10100 Round & Flat Bar.
Filler Metal: Always use a matching OF-copper filler rod (ERCu) to maintain the 99.99% purity of the assembly.
Preheating: For sections thicker than 3mm, preheat the material to 150°C - 300°C to prevent "cold start" defects and ensure deep penetration.
How does Vacuum Brazing C10100 work?
Vacuum brazing is the preferred method for medical LINACs and particle accelerator components. Since C10100 is oxygen-free, no flux is needed in a vacuum furnace. This prevents the "outgassing" contamination that would occur with standard flux-based brazing.
As discussed in our C10100 Hardness Guide, remember that any brazing cycle will anneal the copper. A Half Hard (H02) bar will transition to a Soft (OS025) state during the cycle. Always account for this drop in yield strength in your structural calculations.
C10100 Joining Checklist
| Step | Action | Result |
| 1. Cleaning | Solvent Degrease | Removes oils that cause porosity |
| 2. Deoxidizing | 10% Citric Acid | Removes surface CuO for better wetting |
| 3. Gas Control | 99.999% Pure Ar | Prevents atmospheric contamination |
| 4. Cooling | Slow furnace cool | Minimizes internal stress and warping |
FAQ
1. Can I weld C11000 to C10100?
Yes, but the joint will only be as reliable as the C11000. The C11000 side will still be prone to hydrogen embrittlement, which is why UHV systems use C10100 for both sides of the joint.
2. Why did my C10100 weld crack?
Cracking is usually caused by using the wrong filler metal or insufficient preheating. If the weld pool cools too quickly due to high thermal conductivity, it can create "hot cracks."
3. Does welding affect the 101% IACS conductivity?
The bulk material remains 101% IACS. However, the weld bead may have slightly higher resistance due to the cast grain structure. For critical electrical paths, laser welding or electron beam welding (EBW) provides the smallest heat-affected zone.
4. What filler rod should I use for C10100?
Use ERCu (Deoxidized Copper) or specialized OF-copper filler. Avoid brass or bronze fillers as they will contaminate the 99.99% purity and cause outgassing in vacuum systems.
5. Is preheating mandatory for all C10100 welding?
Only for thick sections. Thin C10100 Foil can be welded without preheating, but large busbars require it to overcome the massive heat sink effect of the copper.
6. Can I TIG weld C10100 without filler?
Yes (Autogenous welding). This is common for thin-walled tubes or precision parts where maintaining the exact 99.99% chemical composition is the top priority.
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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