Raytron Technical Review RESEARCH ARTICLE WP-01-10

Advanced Testing: Bimetallic Conductor Characterization

Q: How to ensure accuracy of test results?

Methods to ensure accuracy: use calibrated equipment, follow standard test methods, perform repeat testing, establish test uncertainty assessment, regularly conduct inter-laboratory comparison. Testing personnel need professional training.

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-01-10

Abstract

Advanced characterization and testing methods are essential for ensuring bimetallic conductor quality and performance. This whitepaper reviews state-of-the-art testing techniques including microscopy, spectroscopy, mechanical testing, and non-destructive evaluation methods for bimetallic conductors.

Key Findings

Microscopy Reveals Microstructure SEM can observe interface morphology and defects with resolution of 10nm; TEM can observe atomic structure and interface reaction layer with resolution of 0.1nm. Microscopy is a key tool for understanding bimetallic conductor properties.
Non-destructive Testing Ensures Reliability Ultrasonic testing can detect interface delamination and porosity with detection capability >0.5mm; eddy current testing can measure conductivity and cladding thickness; X-ray testing can detect internal defects. Non-destructive testing achieves 100% inspection.
Mechanical Testing Verifies Performance Tensile testing measures tensile strength, yield strength, and elongation; peel testing measures interface bond strength; fatigue testing evaluates performance under cyclic loading. Mechanical testing ensures products meet application requirements.
Electrical Testing Ensures Function Four-point probe method measures resistivity and conductivity; contact resistance testing evaluates connection performance; temperature coefficient testing evaluates temperature stability. Electrical testing is the most basic functional verification for bimetallic conductors.

Keywords

bimetallic testing;microscopy;spectroscopy;non-destructive testing;quality assurance;characterization

1. Introduction

2. Microscopy Analysis

**Fig. 1** SEM Interface Morphology Photo

3. Inspection

Ultrasonic Inspection Principles — **Fig. 2** Ultrasonic Inspection Principle Diagram

4. Mechanical Testing

5. Testing

6. Conclusion

Frequently Asked Questions

How to choose appropriate characterization method?

Choose based on information needed: SEM for interface morphology, TEM for atomic structure, EDS for composition distribution, peel testing for bond strength, four-point probe for conductivity. Combining multiple methods provides comprehensive characterization.

What are the limitations of non-destructive testing?

Ultrasonic testing has difficulty detecting small defects (<0.5mm); eddy current testing is affected by material magnetism and surface condition; X-ray testing has low sensitivity for thin sections. Non-destructive testing needs to be combined with destructive testing.

How to ensure accuracy of test results?

Methods to ensure accuracy: use calibrated equipment, follow standard test methods, perform repeat testing, establish test uncertainty assessment, regularly conduct inter-laboratory comparison. Testing personnel need professional training.

Figures

SEMInterface MorphologyPhoto

Fig. 1 SEMInterface MorphologyPhoto

Ultrasonic Testing Principle Diagram

Fig. 2 Ultrasonic Testing Principle Diagram

Create Tensile Test Curve

Fig. 3 Tensile Test Curve

Tables

Table 1 Microscopy Techniques Comparison

Technique	Resolution	Info Type
OM	0.5 μm	Morphology
SEM	10 nm	Morphology + Composition
TEM	0.1 nm	Atomic Structure

Table 2 Non-Destructive Testing Methods

Method	Detection Capability	Applicability
Ultrasonic	Delamination, Voids	All
Eddy Current	Conductivity, Thickness	Conductive Materials
X-Ray	Internal Defects	Thick Cross-Section

References

ASM International Materials Characterization Handbook ASM (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