Welding Material

 

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GROUP A COPPER-BASE ALLOYS

  • RWMA Class 1 Alloy

    CADMIUM-COPPER, suited to weld aluminum and magnesium alloys, coated materials, brass and bronze.

    Class 1 alloy is superior to pure copper as an electrode material and is recommended as a general purpose material for resistance welding use.  it may be used for spot welding electrodes, seam welding wheels and welding fixture components.  It is not heat treatable

     

  • RWMA Class 2 Alloy

CHROMIUM-COPPER, suited to weld cold-and hot-rolled steals, stainless steel, and low conductivity brasses and bronzes.

Class 2 alloy is a superior resistance welding electrode material, recommended for high-production operations.  It is used for welding electrodes, projection welding dies, seam welding shafts and bearings, flash and butt welding dies, and current-carry structural components. 

It is heat treatable.

  • ZIRCONIUM Z

ZIRCONIUM-CHROMIUM-COPPER is suited to welding galvanized steel and other metallic-coated steel.

This is a special heat-treated alloy which meets the minim electrical conductivity and hardness specifications of Class 2 alloy.

  • RWMA Class 4 alloy

BERYLLIUM-COPPER has extremely high hardness and is recommended for projects, flash and butt welding dies.  It has lower conductivity than Class 3 alloy but is harder and more wear resistant. It should be considered where there is concern with high pressure density and severe wear, but where heating, due to low conductivity, is not excessive.  It is used frequently in the form of inserts, die facings and seam welder bushings.  It is available in the annealed condition which is more readily machined and then subsequently heat treated.

GROUP B REFRACTORY METAL COMPOSITIONS

  • RWMA Class 10

TUNGSTEN 55%-COPPER 45%, suited for facings and inserts for projection welding electrodes and flash and butt welding dies.  It is recommended where relatively high electrical conductivity and some degree of malleability is desired.

  • RWMA Class 11

TUNGSTEN 75%-COPPER 25%, suited to similar applications as Class 10, for facing on electrodes forming dies.  It is harder then Class 10 and is generally used in projection welding electrodes.

  • RWMA Class 12

TUNGSTEN 80%-COPPER 20%, suited for electrode-forming and electro-forging die facings and for electrode facings used to upset studs and rivets.  A material for heavy-duty projection welding electrodes and dies.

  • RWMA Class 13

TUNGSTEN

  • RWMA Class 14

MOLYBDENUM

Class 13 & 14 materials are used primarily for welding or electro-brazing non-ferrous metals having relatively high electrical conductivity.  They are suited to cross-wire welding of copper and brass, and for welding copper wire braid to brass or bronze terminals.  Special set-ups and procedures are required.