Raytron Technical Review RESEARCH ARTICLE WP-01-09

Quality Control: Ensuring Bimetallic Conductor Reliability

Q: What are the main quality defects of bimetallic conductors?

Main defects include: interface delamination (poor bonding), cladding eccentricity (uneven thickness), surface cracking (excessive work hardening), dimensional out-of-tolerance (die wear), insufficient conductivity (raw material issues). These defects can be avoided through strict process control and inspection.

Q: How to establish an effective quality control system?

Establishing quality control system requires: 1) Define quality standards and testing methods; 2) Establish raw material inspection procedures; 3) Implement process monitoring and SPC; 4) Establish finished product inspection specifications; 5) Establish traceability and corrective action systems; 6) Continuous training and improvement.

Q: How is SPC applied in bimetallic conductor production?

SPC is applied to monitor key parameters: conductivity, tensile strength, dimensions, etc. Use X-bar R charts to monitor process mean and variation, set control limits and specification limits. When data points exceed control limits, analyze causes and take corrective actions.

Gao-Lei Xu¹ *

¹RAYTRON Group Technology Research Center, China

^*Corresponding author

Received: 2025-12 Accepted: 2026-02 Published: 03/2026

DOI: 10.1234/raytron.2026.WP-01-09

Abstract

Quality control is essential for ensuring bimetallic conductor reliability and performance. This whitepaper examines quality management systems, testing protocols, statistical process control, and certification requirements for CCA, CCS, and NCC manufacturing.

Key Findings

Key Quality Indicators Defined Key quality indicators for bimetallic conductors include: conductivity (CCA≥62% IACS), tensile strength (≥150MPa), elongation (≥15%), interface bond strength (>40MPa). These indicators need regular testing and SPC control.
Statistical Process Control is Effective SPC monitors variation of key parameters through control charts, detecting abnormal trends in time. Key parameters include dimensions, conductivity, tensile strength, etc. Cpk>1.33 indicates adequate process capability, Cpk<1.0 requires improvement.
Non-destructive Testing Ensures Quality Ultrasonic testing can detect interface delamination and porosity, eddy current testing can measure conductivity and cladding thickness. Non-destructive testing achieves 100% inspection, preventing defective products from entering the market.
Quality System Needs Continuous Improvement Establish comprehensive quality management system, including raw material inspection, process control, finished product testing, and customer feedback. Continuous improvement through PDCA cycle reduces defect rate and improves customer satisfaction.

Keywords

quality control;bimetallic conductor;testing protocol;SPC;certification

1. Introduction

2. Quality

3. Inspection

4. Process Control

5. Conclusion

Frequently Asked Questions

What are the main quality defects of bimetallic conductors?

Main defects include: interface delamination (poor bonding), cladding eccentricity (uneven thickness), surface cracking (excessive work hardening), dimensional out-of-tolerance (die wear), insufficient conductivity (raw material issues). These defects can be avoided through strict process control and inspection.

How to establish an effective quality control system?

Establishing quality control system requires: 1) Define quality standards and testing methods; 2) Establish raw material inspection procedures; 3) Implement process monitoring and SPC; 4) Establish finished product inspection specifications; 5) Establish traceability and corrective action systems; 6) Continuous training and improvement.

How is SPC applied in bimetallic conductor production?

SPC is applied to monitor key parameters: conductivity, tensile strength, dimensions, etc. Use X-bar R charts to monitor process mean and variation, set control limits and specification limits. When data points exceed control limits, analyze causes and take corrective actions.

Figures

Create Quality ControlFlowchart

Fig. 1 Quality ControlFlowchart

Create SPC Control DiagramExample

Fig. 2 SPC Control DiagramExample

Defects TypeStatistics Diagram

Fig. 3 Defects TypeStatistics Diagram

Tables

Table 1 Key QualityIndex

Index	Specifications	Testing Frequency
Conductivity	≥62% IACS	Per Roll
Tensile Strength	≥150 MPa	Per Lot
Elongation	≥15%	Per Lot

Table 2 TestingMethod

TestingProject	Method	Standard
Conductivity	Eddy Current Method	ASTM B193
Dimension	ASTM B258
Bonding Strength	Peel Test	ASTM B452

References

ASTM International ASTM Standards for Bimetallic Conductors ASTM (2020)

Authoritative References

ASTM International IEC (International Electrotechnical Commission) ISO (International Organization for Standardization) SAE International IEEE

Gaolei Xu

Senior Materials Scientist

Credentials & Honors

• CTO, Raytron Group
• Zhejiang Provincial High-level Talent Special Support Program - Young Talent
• Shaoxing "Technology Vice President"
• Shaoxing Science and Technology Commissioner
• Member of National Technical Committee 243 on Heavy Metals (SAC/TC 243/SC2)

National Standards (Lead Author) View Official

GB/T 27671-2011 - Copper Profiles for Electrical Conductors
YS/T 1043-2015 - Silver-bearing Oxygen-free Copper Strip for Motor Commutators
YS/T 974-2014 - Copper and Copper Alloy Strip for Composite Contact Materials
YS/T 1082-2015 - Copper Strip for Lamp Lead Stents

Patents (Inventor) Search Patents

CN104959396A - Production Process of Copper Strip for Composite Contact Materials
CN106077125A - Production Process of Copper Profile for Magnetic Pole Coils
CN201410710206 - Conductive Material for High-speed Railway Traction Motors and Production Method
CN201310719717 - Method for Controlling Strip Shape of Copper Strip Blank by Continuous Extrusion
CN201310720126 - Device for Controlling Strip Shape of Copper Strip Blank by Continuous Extrusion
CN201310376884 - Five-in-one Copper Strip Edge Treatment Equipment for Transformers
CN201420184755 - Continuous Extrusion Die Flow Promotion Device
CN201320761640 - Continuous Extrusion Waste Cleaning Device

Areas of Expertise

Copper-Clad Aluminum (CCA) Technology Copper-Clad Steel (CCS) Manufacturing Bimetallic Composite Materials PV Ribbon for Solar Cells Battery Tab Materials for EV Applications Continuous Extrusion Technology

Selected Publications

• Research and Application of Rolling Method for Manufacturing Metal Laminated Composites, Aluminum Processing Journal, 2008
• Annealing Process Research of Copper-Aluminum Composite Strip
• Research on Preparation Process of Copper/Aluminum Composite Strip for Cables
• Interface Microstructure Evolution of Rolled Copper/Aluminum Composite Strip During Annealing

Mr. Xu Gaolei is a distinguished expert in non-ferrous metal processing with over 15 years of experience. He is recognized as a Young Talent under the Zhejiang Provincial High-level Talent Special Support Program. He leads R&D initiatives in bimetallic composite technologies and has contributed significantly to the standardization of copper and bimetallic materials in China.

Click standard/patent codes to view official documents