Dr. Livingstone, I Presume WELDWISE 2400 - Manual (Page 167)

0447-INS-400 Rev. C 11-21
Common Uses of RWMA Material
Electrode Material Properties Material To Be Welded
Class 1
High Conductivity
Soft
High current and heat
conduction
Electrodes for welding aluminum alloys,
magnesium alloys, coated materials, brass and
bronzes. Can be used for both spot and seam
welding.
Class 2
Medium Conductivity
Medium Hard Improved strength and good
electrical and thermal
properties
They are used for the spot and seam welding of
cold and hot rolled steel, stainless steel and low
conductivity brass and bronze. They are also used
as flash welding dies and as electrodes for the
welding of galvanized steel and other coated
materials.
Class 3
Low Conductivity
Very Hard
High heat and pressure
resistance
Electrodes for the spot and seam welding of high
resistance materials such as stainless steel,
nichrome and monel metal. As a casting, they are
used for flash, butt and projection welding
electrodes and fixtures. They can also be used for
seam welder bearings and other current carrying
structural parts.
Class 20
Medium Conductivity
Medium Hard Good electrical and thermal
properties with heat and
temperature resistance Welding of metallic coated metal such as
galvanized steel, terne plate, mild steel, low alloy
steel, etc.
Class 10-14
Low Conductivity
High Hardness
High heat, high pressure and
mechanical wear resistance
They are used for welding highly conductive
materials like copper or silvers, projection
welding, cross-wire welding, electro-forming,
electroforging and upsetting. Also used for low
conductors like stainless where high pressures are
needed.
Figure 11-8 Common Uses of RWMA Material (reprinted with permission)