COPPER CHROMIUM

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Copper Chromium C18200, RWMA Class 2, AWS J1.3

 

Copper Chromium is the primary copper alloy used for resistance spot and seam welding. This alloy achieves good hardness and electrical conductivity through a combination of heat treatment and cold work. It is widely utilized for electrodes, holders, adaptors, as well as numerous electrical applications where resistance to deformation at high temperature is required or when higher mechanical properties than C11000 are required.

 

Chemical Compositions of RWMA Materials   Group A - Copper Base Alloys
RWMA Class UNS Number Description Cu¹ Fe W Cd Co Ni Cr Si Be Pb Zr Al
2 C18200 Chromium Copper Balance - - - - - 0.6-1.2% 0.10% max. - 0.05% max. - -

 

Typical usages of RWMA Class 2 copper alloy: C18200 is recommended spot and seam welding, cold and hot rolled steels, coated materials, current-carrying shafts and arms, back-up bars for both resistance and arc welding, and electrical current carrying structural parts and more see below.

 

 

GENERAL USES OF C18200

 

Back-up Electrodes

Bushings

Caps & Shanks

Casting Wheels

Centrifugal Casting Molds

Circuit Breaker Parts

Collector Connector

Collector Housing

Connector Bar

Connectors

Connection Lead Bar

Cross Wire Welding Electrodes & Components

Damper Ring/Finger

Dies & Fixtures

Electrode Holders and Adaptors

Electrical & Mechanical Power Components

End Rings & Rotor Bar

Flash & Butt Welding Dies

Flexible Connector

Injection Blow Molds & Dies

Lead Conductor Bar

Neutral Bus Bar

Nut & Stud Welding Electrodes

Power Generation Products

Power Semiconductor Bases

Resistance Welding Electrodes

Rotor Coil Bars

Seam Weld Wheels

Series Loop Segment

Shafts

Slip Rings

Slot Wedge

Snap Rings

Special Nipple

Spot Welding Electrodes

Terminal Box Connectors

Threaded Electrodes

Transmission Devices

Water Clip

Welding Arms

Welding Connectors

Welding Platens

 

 

 

Item Name: Copper Chromium Alloy C18200 
RWMA (Resistance Welding Manufacturing Alliance) Class: Class 2
Principal Element: Cu, Cr
Minimum Hardness Rockwell (up to 1" dia.): HRB 75
Minimum Electrical Conductivity (% IACS): 75
Metal Stock Availability: Stocked in mill form or precision cut to your specifications.
Shape: Bar
Hexagon
Octagon
Plate
Rectangle
Round
Special
Square
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 15 1/8 in
Special Sizes
Thickness for Plate: 1/8 to 10 in
Special Sizes
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
Hardness
Tensile
Yield
Nondestructive Testing: Chemical Analysis
Conductivity
Liquid Penetrant
Ultrasonic
X-Ray
Alloy Applications Cross Reference Chart C15000 C18150 C18000 C18200 C17510 C17200 C15760
Axial Conductors X            
Back-up Electrodes X X X X X X X
Bushings X X X X X    
Caps & Shank X X X X X X X
Casting Wheels X X   X      
Casting Wheels and Dam Blocks     X   X X  
Centrifugal Casting Mold X X X X      
Circuit Breaker Parts X X   X     X
Collector Connector X X   X       
Collector Housing X X   X      
Connector Bar X X   X      
Connectors X X X X X   X
Connection Lead Bar X X   X      
Continuous Casting Molds X X X X X X  
Cross Wire Welding Electrodes & Components X X X X X X X
Damper Ring/Finger X X X X      
Dies & Fixtures X X X X X X  
Die Casting Pistons     X   X X  
Die Casting Plunger Tips     X   X X  
Electrode Holders & Adaptors X X X X X X  
Electrical & Mechanical Power Components X X X X X X X
Flash & Butt Welding Dies X X X X X X X
Flexible Connector X X   X      
Heat Flux Components X X X X X   X
Injection Blow Molds & Dies   X X X X X  
Joining Components X   X   X X X
Lead Conductor Bar X X   X      
Motor End Rings X X X X X    
Neutral Bus Bar X X   X      
Non-Sparking Applications   X X X X X  
Nut & Stud Welding Electrodes X X X X X X  
Performance Engine Components     X   X X  
Permanent Molds     X   X X X
Power Generation Products X X X X      
Power Semiconductor Bases X X   X      
Resistance Welding Electrodes X X X X X X  
Rotor Coil Bar X X   X      
Seam Weld Wheels X X X X X X  
Series Loop Segment X X   X      
Shafts X X X X X X  
Slip Rings X X   X      
Slot Wedge X X X X      
Snap Rings X X   X      
Special Nipple X X   X      
Terminal Box Connectors X X   X      
Threaded Electrodes X X X X X X  
Transmission Devices X X   X     X
Water Clip X X   X      
Wear Plates           X  
Welding Arms X X X X X X  
Welding Blocks X   X   X X  
Welding Connectors X X X X X X  
Welding Platens X X X X X X