Welding Electrode Alloys And Their Applications

GROUP A – COPPER BASE ALLOYS

CLASS 1 – Copper zirconium alloy that is superior to pure copper because of its higher annealing temperature, 350˚C (662˚F), while still maintaining comparable electrical and thermal conductivity. It is recommended for spot welding aluminum and magnesium alloys, coated material (terne plate, tin plate, galvanized iron, cadmium plate), brass and bronze.

CLASS 2 – A chromium copper alloy most generally used for spot welding electrodes. This material is a precipitation hardened material having a high annealing temperature, 500˚C (932˚F). It is recommended for welding clean, low alloy steels, stainless steel, low conductivity brasses, and nickel alloys.

CLASS 3 – A beryllium copper alloy possessing a combination of toughness, hardness and high resistance to annealing, 550˚C (1022˚F). It is recommended for welding stainless steel, monel metal and special welding components requiring high strength, wear resistance and good conductivity. Also available in Beryllium free (alloy 18000).

GROUP B – COPPER TUNGSTEN ALLOYS,
TUNGSTEN and MOLYBDENUM

Generally this group of materials is recommended for electrode
facings and welding dies. The hardness of these materials is
unaffected by welding temperature; this quality gives them definite
advantages where adequate cooling cannot be maintained.

CLASS 11 – A tungsten copper alloy recommended as facings
and inserts for flash and butt welding dies and general
purpose projection welding electrodes. It is recommended for
high melting steels such as stainless steel.

CLASS 13 – Pure Tungsten
This material does not alloy readily with non-ferrous metals and
therefore is used in welding copper and brass. It is also used for
electro-brazing electrodes. This material is not readily machinable.

CLASS 14 – Pure Molybdenum
This material is used for electro-brazing and welding nonferrous
metals as is class 13.
It is not as hard as tungsten, however it is readily machinable
which may be advantageous.

CLASS 20 – Dispersion strengthened copper (Glidcop®)
This material has very high resistance to annealing (1000˚C).
Most commonly available in male /female caps yielding a long life premium cap.

PROPERTIES OF TYPICAL RWMA WELDING METALS