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Copper Alloys for RWMA Applications


National Bronze & Metals, Inc. has huge inventories of RWMA (Resistance Welding Manufacturing Alliance)
alloys available in diameter bars, squares, coil, hex, and plate. We also have abundant inventories of
C11000 - EPT Copper, and C14500 - Tellurium Copper. Both are available in rounds, hex, and rectangles.

C15000 - Zirconium Copper

[RWMA CLASS 1]
CLASS 1: Caps, Tips, Welding Wheels
conductivity (min.)......80% IACS
hardness (min.)............Rb 65

 

 

Class 1 Alloy (Copper Cadmium)

Class 1 Alloy is superior to pure copper as an electrode material and is recommended as a general purpose material for resistance welding
applications. It may be used as spot welding electrodes, seam welding wheels, and welder fixtures.

Specifically recommended, because of its high electrical and thermal conductivity, for spot welding aluminum alloys, magnesium alloys,
coated materials (Terne Plate, Tin Plate, Galvanized Iron, Cadmium Plate), Brass and Bronze. Class 1 Alloy is not practical in cast form.
It is not heat treatable.

  

C18200 - Chromium Copper
C18150 - Chromium Zirconium Copper

[RWMA CLASS 2]
CLASS 2: Electrodes, Caps, Tips, Wheels
conductivity (min.)......75% IACS
hardness (min.)............Rb 75







Class 2 Alloy (Copper Chromium)

Class 2 Alloy is a superior resistance welding electrode material specifically recommended for high level production spot and seam welding
of clean mild steel, low alloy steels, low conductivity brasses and bronze.

Suitable for projection welding dies, seam welder shafts and bearings, flash and butt welding dies and current carrying structural members.

Available as high strength and high electrical conductivity castings for such use as gun welder arms, welder platens and secondary structural
members.

The Class 2 Alloy is heat treatable.		  

C17500 - Beryllium Copper (CO)
C17510 - Beryllium Copper (NI)
C18000 - Beryllium Free

[RWMA CLASS 3]
CLASS 3: Welding Arms, Extensions, Welding Dies
conductivity (min.)......45% IACS
hardness (min.)............Rb 90

Download PDF Spec Sheet for C17500.

Download PDF Spec Sheet for C18000.

 

 
Class 3 Alloy (Copper Beryllium with Additions of Cobalt, Nickel or Silver)

Class 3 alloy is specifically recommended for projection welding dies, flash and butt welding dies, current carrying shafts and bushings.
As castings, class 3 alloys (having higher strength than class 2), is recommended for highly stressed welder structural current carrying
members and heavy-duty offset electrode holders.

Class 3 Alloy is generally recommended for spot welding and seam welding steels having high electrical resistance, such as stainless
steels.

The Class 3 Alloy is heat treatable.
  

C17200 - Beryllium Copper

[RWMA CLASS 4]
CLASS 4: Welding Dies, Welding Inserts
conductivity (min.)......20% IACS
hardness (min.)............Rc 38

Download PDF Spec Sheet for C17200.

    
Class 4 Alloy (Copper Beryllium)

Class 4 Alloy has extremely high hardness and ultimate strength although the electrical conductivity is lower than the Class 3 Alloy.

It is generally recommended as electrode material for special flash, flash butt and projection welding applications where pressures
are extremely high and wear is severe but where heating is not excessive. It is available as wrought material for highest quality dies
and electrodes and may, also, be obtained as high strength castings. It is used frequently in the form of inserts and die facings, and
may also be used for seam welder bushing.

Class 4 Alloy is available in the annealed condition in which state it can be more readily machined and may be subsequently heat treated
to maximum hardness.		  

 
Download our flyer containing this information
on copper alloys for RWMA applications.