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AMZIRC is oxygen free copper plus zirconium. 


It is an excellent resistance welding material with very high softening temperatures. A small addition of zirconium to copper improves resistance to softening and resists deformation at high temperatures where normal copper would soften rapidly. AMZIRC is used as an RWMA Class 1 electrode material to minimize sticking when resistance spot welding galvanized or coated materials.




Chemical Compositions of RWMA Materials   Group A - Copper Base Alloys

RWMA Class

Name & UNS Number






Copper Zirconium

99.80% min.

0.10 – 0.20%

Cu: Copper

Zr: Zirconium


Typical usages of AMZIRC Copper Alloy:

1. Spot welding of coated steels and high conductivity materials, excluding copper and silver

2. Structural heat flux applications

3. Generator and motor components





Axial Conductors

Back-up Electrodes


Caps & Shanks

Casting Wheels

Centrifugal Casting Molds

Circuit Breaker Parts

Collector Connector

Collector Housing

Connector Bar


Connection Lead Bar

Continuous Casting Molds

Cross Wire Welding Electrodes & Components

Damper Ring/Fingers

Dies & Fixtures

Electrode Holders & Adaptors

Electrical & Mechanical Power Components

End Rings & Rotor Bar

Flash & Butt Welding Dies

Flexible Connector

Joining Components

Lead Conductor Bar

Neutral Bus Bar

Nut & Stud Welding Electrodes

Power Generation Products

Power Semiconductor Bases

Resistance Welding Electrodes

Rotor Coil Bar

Seam Weld Wheels

Series Loop Segment

Slip Rings


Slot Wedge

Snap Rings

Special Nipple

Spot Welding Electrodes

Terminal Box Connectors

Transmission Devices

Threaded Electrodes

Water Clip

Welding Arms

Welding Blocks

Welding Connectors

Welding Platens




Item Name: AMZIRC Copper Zirconium 
RWMA (Resistance Welding Manufacturing Alliance) Class: Class 1
Principal Element: Cu, Zr
Minimum Hardness Rockwell (up to 1" dia.): HRB 65
Minimum Electrical Conductivity (% IACS): 80
Metal Stock Availability: Stocked in mill form or precision cut to your specifications.
Shape: Bar
Length for Round, Hexagon, Square, Octagon, Rectangle, Special Shapes: All sizes in standard lengths up to 12 ft
Special Sizes
Diameter for Round, Hexagon, Square, Octagon, Rectangle, Special Shapes: 1/8 to 8 1/8 in
Special Sizes
Thickness for Plate: 1/8 to 8 in
Special Sizes

Quality Assurance


Quality Policy: Cadi Company Inc. is dedicated to world-class excellence. Our commitment is to continually achieve the highest standards required to meet our customer’s needs.  Cadi is committed to a policy of continuous improvement within all areas of the organization through customer communication, by means of quality planning and review, as well as employee training and participation to achieve the Cadi commitment goal of 100% in quality, effectiveness, and customer satisfaction.


Quality Objectives: Cadi Company, Inc. is committed to the development and implementation of the ISO Quality Management System. We pledge that through the efforts of all our employees working together as a team, we will continually strive to be a leader (in our markets) in satisfying our customers’ needs with regard to service, performance, and competitive pricing. Cadi shall maintain global and domestic sources to provide quality products as required by our customers. Cadi will provide our customers with the highest level of satisfaction by achieving the goal of 100% in the areas of product quality and on-time delivery performance.


Cadi Company is committed to providing goods and services that meet or exceed our customer’s requirements and expectations. It is our firm belief that this dedication to the highest standards is the cornerstone of our existence.

  • We have the equipment and processes to guarantee the quality of the products we manufacture.
  • We continually upgrade our equipment and have ongoing training company-wide.
  • Each order undergoes stringent Quality Assurance Processes to assure accuracy and precision to the client’s specifications and is verified throughout the manufacturing cycle with scheduled quality assurance audits.
  • All material is subject to detailed physical tests where microstructures, tensile, yield strength, U.T. testing, eddy current conductivity, elongation, and hardness are measured and reported.
  • Climate-controlled inspection facility.
  •  We have a Metallurgical Engineer on-site for any technical questions.


To ensure Cadi follows rigorous quality and procedural protocols we are ISO 9001:2015 Certified and have been for over 18 years.


ISO Certification: 9001:2015 (Registration # 10002745 QM15 Valid until 2024-08-21)
Reports: Certification of Compliance
Chemical Analysis
Final Inspection
Material Test Reports
Mechanical and Physical Testing: Elongation
Grain Size
Nondestructive Testing: Chemical Analysis
Liquid Penetrant

NOTE: AMZIRC, C15000 Copper Zirconium and C18150 Copper Chromium Zirconium are both good replacements for C16200 Copper Cadmium. AMZIRC, C15000 Copper Zirconium is a good replacement because of its excellent thermal and electrical conductivity while offering moderate strength. AMZIRC strength properties are developed through cold working (similar to C16200) whereas C18150 strength properties are developed primarily from heat treating (precipitation hardening), which is an advantage for large parts.


Other References For AMZIRC: Class 1 Copper, RWMA Class 1 Copper, Copper Zirconium Supplier Manufacturer Distributor, CuZu Copper, UNS C15000, CDA C15000, and Amzirc C15000.