Tungsten Copper Resistance Welding

tungsten copper resistance welding photoThe high physical and mechanical properties, as well as the thermal and electrical conductivity, of refractory metal composites make tungsten copper alloy very suitable for die inserts and electrode facings, flash and butt welding dies, and hot upsetting. They can also solve heat balance problems.

Tungsten Electrodes for TIG welding

Tungsten copper resistance welding are used when arc welding with the Tungsten Inert gas (TIG) process or when plasma welding. In both processes the electrode, arc and weld pool are protected from atmospheric contamination by an inert gas. A tungsten electrode is used because it can withstand very high temperatures with minimal melting or erosion. Electrodes are made by powder metallurgy and are formed to size after sintering.

Tungsten copper resistance welding are available in thoriated, lanthanated, ceriated, and a few other varieties.

Type Brand Color Chemical Composition(%) Sizes (mm) Surface Features
Rare Earth Impurities W
WP Green ≤0.05 the rest 0.8~15 D,E
Non-radioactive;suitable for AC welding of aluminum, magnesium, and their alloy
Thoriated Tungsten WTh10 Yellow 0.9~1.1ThO2 ≤0.05 the rest 0.8~15 D,E
Excellent electron emission and overall performances; high current-carrying capacity; radioactivity; suitable for DC welding of carbon steel, stainless steel,nickel alloy and titanium alloy.
WTh20 Red 1.8~2.2ThO2 ≤0.05 the rest 0.8~15
Lanthanum Tungsten WLa10 Black 0.8~1.2La2O3 ≤0.05 the rest 0.8~15 D,E G,S Non-radioactive;excellent electric conductivity and welding capacity; high current-carrying capacity; minimum ratio of burnt area; substitute for thoriated tungsten electrode; mainly used in DC welding.
WLa15 Golden Yellow 1.3~1.7 La2O3 ≤0.05 the rest 0.8~15
WLa20 Blue 1.8~2.2 La2O3 ≤0.05 the rest 0.8~15
Cerium Tungsten WCe10 Pink 0.8~1.2CeO2 ≤0.05 the rest 0.8~15 D,E G,S Non-radioactive;easier arc initiation under low current circumstances, and low arc-maintaining current;suitable for the welding of pipelines,small components and discontinuous welding.
WCe15 Orange 1.3~1.7CeO2 ≤0.05 the rest 0.8~15
WCe20 Grey 1.8~2.2CeO2 ≤0.05 the rest 0.8~15
WY20 Sky Blue 1.8~2.2Y2O3 ≤0.05 the rest 0.8~15 D,E
Non-radioactive;long and slim arc beam with high compression; deeper burning groove under medium and high current circumstances.
Compound Rare Earth Tungsten WMX Cyan 1.0~5.0MOx ≤0.05 the rest 0.8~15 D,E G,S Compound rare-earth tungsten electrode; different additives contributing to better performance of tungsten electrode

Note:D—As Drawn     E—Electrolytic Polished    G—Ground      S—Swaged

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