Amada HF-2500A - Page 146

APPENDIX F: THE BASICS OF RESISTANCE WELDING
HF-2500A HIGH FREQUENCY WELD CONTROL
F-2 990-371
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
Selection Table for selecting the proper electrode materials.
MATERIAL
ELECT
RWMA
TYPE
MATERIAL
ELECT
RWMA
TYPE
MATERIAL
ELECT
RWMA
TYPE
MATERIAL
ELECT
RWMA
TYPE
Alumel -2 Alumel -2
Beryllium
Copper
-2
Cold Rolled
Steel
-2
Alumel -2 Chromel -2
Beryllium
Copper
-2 Stainless Steel -2
Alumel -2 Dumet -2 Brass -2, -14 Brass -2, -14
Aluminum -1 Aluminum -1 Brass -2, -14 Tinned Brass -14
Aluminum -1
Aluminum
Alloys
-1
Brass -2, -14 Consil -2
Aluminum -1 Cadmium Plating -1 Brass -2, -14 Constantan -2
Aluminum -1 Tinned Brass -14 Brass -2, -14 Copper -14
Aluminum -1 Tinned Copper -14 Brass -2, -14 Tinned Copper -14
Aluminum -1
Gold Plated
Dumet
-2
Brass -2, -14 Dumet -2
Aluminum -1
Gold Plated
Kovar
-2 Brass -2, -14 Nichrome -2
Aluminum -1 Kovar -2 Brass -2, -14 Nickel -2
Aluminum -1 Magnesium -1 Brass -2, -14 NiSpan C -2
Aluminum -1
Cold Rolled
Steel
-2 Brass -2, -14 Paliney 7 -2
Aluminum -1 Stainless Steel -2 Brass -2, -14 Silver -11, -14
Beryllium
Copper
-2
Beryllium
Copper
-2
Brass -2, -14
Cold Rolled
Steel
-2
Beryllium
Copper
-2 Brass -2, -14
Brass -2, -14 Stainless Steel -2
Beryllium
Copper
-2 Copper -14
Bronze -2, -11 Bronze -2, -11
Beryllium
Copper
-2 Tinned Copper -14
Bronze -2, -11 Tinned Copper -14
Beryllium
Copper
-2 Nickel -2
Bronze -2, -11 Iron -2