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New Southern Resistance Welding, Inc.

Group A - Copper Base Alloys


RWMA Condition Principal Elements RWMA
Alloy
Number
Hardness
Rockwell
Electrical
Conductivity
%I.A.C.S.
Ultimate
Tensile
Strength, psi
Elongation
%in 2
Permanent
Softening Begins
at
°C    °F
Class 1 Wrought* Copper, Cadmium 1.16200 70 B 90 65,000 15 350 660
Class 1 Wrought** Copper, Zirconium 1.15000 70 B 90 66,000 10 500 930
Class 2 Cast
Wrought***
Copper, Chromium 2.182000 70 B
83 B
80
85
50,000
75,000
20
15
500
500
930
930
Class 2 Wrought*** Copper Chromium
Zirconium
2.18150 83 B 85 75,000 15 500 930
Class 3 Cast Copper Nickel
Silicon,
Chromium
3.18000 90 B 48 85,000 10 455 850
Class 3 Cast
Wrought
Copper, Nickel
Beryllium
3.17510 95 B
100 B
48
48
95,000
110,000
10 455
455
850
850
Class 4 Cast
Wrought
Copper, Beryllium 4.17200 38 C
38 C
20
23
110,000
170,000
4 375
375
710
710
Class 5 Cast Copper, Aluminum 5.95300 92 B 13 85,000 15 620 1150
  Cast
Wrought
Pure Copper . 30 B
40 B
95
100
25,000
40,000
50
35
200
200
390
390

Class 1 Alloy (Copper Zirconium)

Chromium Zirconium Copper has higher annealing temperature than standard Chrome Copper.


Class 2 Alloy (Copper Chromium)

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

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 casting for such use as gun welder arms, welder platens and secondary structural members.

The Class 2 Alloy is heat treatable.


Class 3 Alloy (Copper Beryllium)

Class 3 Alloy is specifically recommended for projection welding dies, flash and butt welding dies, current carrying shafts and bushings. As castings, Class 3 Alloy (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.
See Material Safety Data Sheets,

Beryllium Free

Beryllium Free meets the mechanical requirements of Class 3 Copper.

Class 4 Alloy (Copper Beryllium)

Class 4 Alloy has extremely high hardness and ultimate tensile 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.
See Material Data Safety Sheets.

Class 5 Alloy (Copper Aluminum)

Class 5 Alloy is a copper bas alloy available principally in the form of castings having high mechanical strength and moderate electrical conductivity.

Class 5 Alloy is recommended principally as a high strength and low cost backing material for other resistance welding electrode materials, flash welding dies, and as high strength current carrying structural members of resistance welding equipment, such as secondary circuit welder arms, knees, platens, etc.

It may be used advantageously as natural or current carrying members in resistance welding fixtures where high strength, wear resistance and non-magnetic properties are required.

 

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New Southern Resistance Welding
701 Thames Court
P.O. Box 1147
Pelham, Alabama 35124
Phone  (205) 663-1500 * Fax (205) 663-3221
(800) 933 NSRW (6779)

CMW electrodes, Tuffaloy ELectrodes, CMW, Tuffaloy