Beryllium Copper Strip

Proper use of Beryllium Copper

(3) Joining

Beryllium copper can be joined by soft soldering, silver brazing, resistance welding, TIG and MIG welding like many other metals.

Soft soldering and silver brazing

Soft soldering can be performed at a relatively low temperature between approximately 200 and 350°C for a short period of time without adversely affecting the mechanical properties of materials. Since silver brazing is performed at a relatively high temperature of 600 to 800°C, Beryllium Copper is softened. However, hardness is considerably recovered by additional heat treatment at 315°C for 2 to 3 hours because the metal structure is little changed. Therefore, it is recommendable to perform heat treatment after silver brazing. In either soft soldering or silver brazing, the parts should be free from traces of oil and discoloration. Flux must be removed thoroughly by washing because certain types of flux cause corrosion.

Resistance welding

Spot welding of sheet materials is commonly used as the resistance welding of Beryllium Copper Alloys. Beryllium Copper Alloys 25 and 165 can be spot welded without any problem. However, since Beryllium Alloy 11 has high electric conductivity, optimum conditions must be found for the shape of projections, the material of electrodes, and the control of electrodes. In the spot welding of Beryllium Copper Alloys, the best result is achieved when a large amount of heat is generated by momentarily discharging direct current a capacitor, or by supplying a pulse of alternating current. Since Beryllium Alloy 11 has high electric conductivity, an electrode having at least a conductivity of IACS75% is required. Usually, chromium copper or zirconium copper is used, but aluminum dispersed copper is also preferred because of its high strength at high temperatures.

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