一区二区高清无码电影_麻豆激情在线视频_国产一级黄片免费_2021最新国产在线人成

The production of small-sized copper-clad aluminum flat wire is a highly sophisticated process, involving multiple links such as copper-aluminum composite, precision rolling, surface treatment, annealing, tinning, etc. Each step has strict requirements on size, bonding strength and electrical properties. The following is a systematic process introduction:

Production process of small size copper clad aluminum strip flat wire

1. Raw material preparation

• Aluminum core wire selection: High-purity aluminum (such as 1350 or 3003) requires a smooth surface, no oxide scale, and no impurities.
• Copper layer raw material: High-purity oxygen-free copper or phosphorus deoxidized copper, requiring good ductility, rollability and no cracks.

2. Copper-aluminum composite (cladding)

Small-size products generally use "cladding composite" or "metallurgical bonding" technology to ensure that the copper layer fits tightly against the aluminum core.

• Coating method:
  • The copper strip is wrapped into a tube, which fits tightly to the aluminum core;
  • The initial forming is completed through continuous compounding equipment;
• Heat treatment fusion:
  • Some manufacturers use hot rolling or diffusion welding technology to achieve metallurgical bonding and improve peel strength;
• Detection of copper layer bonding strength:
  • The peel strength test is ≥12N/cm, ensuring that there will be no peeling or bulging during subsequent processing.

3. Multi-pass precision cold rolling

The core of the process is to gradually roll the coated copper-clad aluminum round wire into flat wire of target specifications.

• Multi-roll precision rolling mill:
  • Rolled into small-sized strips with thickness of 0.05mm to 0.30mm and width of 1mm to 10mm;
  • Control the width-to-thickness ratio and the integrity of edges and corners to ensure smoothness and brightness;
• More rolling passes, usually needs 5 to 10 rolling passes;
• Key control parameters:
  • Thickness tolerance: ≤±0.005mm;
  • Width tolerance: ≤±0.03mm;
  • Curvature and edge straightness: must be achievedPhotovoltaic welding ribbonIndustry standard.

4. Intermediate annealing

To improve ductility, eliminate internal stress, and prevent cracking or peeling.

• Control annealing temperature and time to avoid copper and aluminum delamination;
• Ensure that the material has good weldability and softness;
• Improve the stability of the next tinning process.

5. Surface treatment and cleaning

• Purpose: Remove rolling oil and oxides and improve surface activity;
• Use alkaline or neutral detergent, ultrasonic + hot water rinse;
• The surface must meet the standards of being free of particles, scratches, oil and oxide scale.

6. Tin plating (if necessary)

Photovoltaic welding ribbons are mostly tin-plated to enhance welding performance.

• Plating type: pure tin or tin containing silver;
• The tin plating thickness is generally 3~10μm and can be customized;
• Tin plating uniformity control ≤±1μm;
• Subsequent drying treatment ensures a bright surface without tin nodules or tin slag.

7. Inspection and cutting

• Conductivity test: Ensure that the resistivity meets the welding strip standards;
• Bond strength test: The copper layer cannot be peeled off or delaminated;
• Dimensional inspection: width, thickness, edges and corners, surface quality;
• Slit into rolls of specifications required by customers (e.g. 500m, 1000m rolls).

8. Finished product packaging and shipment

• Use moisture-proof film + vacuum seal packaging;
• Add cushioning material to prevent the tape from deforming during transportation;
• Affixed with technical labels such as size, batch, conductivity, etc.
• High temperature, low temperature and salt spray test reports are included with delivery.

Advantages of Ruichuang's small-size copper-clad aluminum flat wire

1. ?? High dimensional control accuracy:RaytronAdopting precision rolling mill imported from Germany, it can produce 210mm, thickness 0.050.3mm high-precision flat wire;
2. ? Strong bonding without delamination：Metallurgical bonding + multiple intermediate annealing to solve the problem of traditional copper-clad aluminum peeling;
3. ?? Excellent electrical conductivity: The copper layer thickness is uniform, the welding efficiency is high, and it meets the photovoltaic welding ribbon replacement standards;
4. ?? Large-volume and stable supply capability: Automated continuous production line to ensure stable delivery time.