High-Performance C18150 Chromium Zirconium Copper Electrode Caps

Short Description:

Product Specifications
Name： Chromium Zirconium Copper Spot Welding Electrode Cap
Standard： RWMA Class 2, ASTM B768, ISO 5821, RoHS Compliant, REACH Compliant
Material： C18150 (Chromium Zirconium Copper)
Surface： Precision Machined, Smooth Contact Face
Diameter： 12mm – 25mm (common sizes)
Height： 20mm – 45mm
Tip Geometry： Pointed, Dome, Flat, or Custom
Product Features:
Excellent electrical and thermal conductivity · Superior hardness and wear resistance · Outstanding resistance to softening at high temperatures · Good anti-sticking properties · Long service life under high current and pressure · Stable performance in continuous production
Application Field:
Automotive body spot welding, Appliance manufacturing, Metal furniture production, Aerospace component welding, Battery tab welding, Steel and aluminum sheet joining, High-volume resistance welding lines

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Chromium Zirconium Copper Spot Welding Electrode Cap – Process & Quality Assurance Statement
Our chromium zirconium copper spot welding electrode caps are precision-manufactured to deliver reliable, long-lasting performance in high-volume resistance welding applications where consistent weld quality and electrode life are critical.

Key process features

Production combines advanced metallurgy with strict process control to ensure every cap meets the demanding requirements of modern automated welding lines:

●Material Selection: Only certified C18150 chromium zirconium copper rod meeting RWMA Class 2 specifications is used, ensuring optimal precipitation hardening response.
●Precision Machining: Caps are CNC machined from solid rod to exact dimensions and tip geometry, with tight control over the working face profile.
●Heat Treatment: Solution annealing followed by controlled precipitation aging develops the ideal balance of hardness, strength, and conductivity.
●Surface Finishing: The contact face is precision finished to achieve the required smoothness and geometry for optimal current distribution and weld quality.
●Cleaning & Inspection: Parts undergo ultrasonic cleaning followed by 100% dimensional and visual inspection.
●Optional Treatments: Special coatings (e.g., anti-sticking or wear-resistant) can be applied upon request.
●Packaging: Electrode caps are carefully packed in protective trays or tubes to prevent damage to the working face during shipping and storage.

Quality control system

● Full traceability from raw material heat number to finished electrode cap
● Material certificates and process records provided with every batch
● Sample retention ≥3 years for third-party verification (SGS, BV, TÜV, etc.)
● 100% inspection of critical parameters:
• Chemical composition (optical emission spectrometry)
• Hardness (Rockwell or Vickers testing)
• Electrical conductivity
• Dimensional accuracy (CMM and go/no-go gauges; tip geometry tolerance per ISO 5821)
• Surface finish of the working face
● Internal standards exceed RWMA Class 2 and ISO 5821 requirements. Typical C18150 properties after proper heat treatment:
Hardness 70–85 HRB, Excellent resistance to softening up to 500°C, Superior wear life compared to pure copper or brass caps.
● ISO 9001:2015 certified manufacturing ensures every chromium zirconium copper spot welding electrode cap delivers consistent weld quality and extended service life in your production environment.