Table of Contents
Advertisement
Electrode Selection
Correct electrode selection strongly influences how weld heat is generated in the weld area. In
general, use conductive electrodes such as a RWMA-2 (Copper alloy) when welding electrically
resistive parts such as nickel or steel so that the weld heat is generated by the electrical resistance
of the parts and the contact resistance between the parts. Use resistive electrodes such as
RWMA-13 (Tungsten) and RWMA-14 (Molybdenum) to weld conductive parts such as copper
and gold because conductive parts do not generate much internal heat so the electrodes must
provide external heat. Use the following Electrode Specification Table for selecting the proper
electrode materials.
MATERIAL
ELECT
RWMA
TYPE
Alumel
-2
Alumel
-2
Alumel
-2
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Alumimun
-1
Beryllium
-2
Copper
IP-215A/IP-217A FINE SPOT WELDING POWER SUPPLIES
993-603 REV A: October, 1996
APPENDIX D: RESISTANCE WELDING BASICS
MATERIAL
ELECT
RWMA
TYPE
Alumel
-2
Chromel
-2
Dumet
-2
Alumimun
-1
Aluminum
-1
Alloys
Cadmium Plating
-1
Tinned Brass
-14
Tinned Copper
-14
Gold Plated
-2
Dumet
Gold Plated
-2
Kovar
Kovar
-2
Magnesium
-1
Cold Rolled Steel
-2
Stainless Steel
-2
Beryllium
-2
Copper
Beryllium
-2
Copper
Beryllium
-2
Copper
Beryllium
-2
Copper
MATERIAL
ELECT
RWMA
TYPE
Beryllium
-2
Copper
Beryllium
-2
Copper
Beryllium
-2
Copper
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Brass
-2, -14
Copper
-14
Tinned Copper
-14
MATERIAL
ELECT
RWMA
TYPE
Nickel
-2
Cold Rolled Steel
-2
Stainless Steel
-2
Brass
-2, -14
Tinned Brass
-14
Bronze
-2
Consil
-2
Constantan
-2
Copper
-14
Tinned Copper
-14
Dumet
-2
D-3
Advertisement
Table of Contents
