Resistance welding is a reliable, low-cost, and effective method of permanently joining two or more pieces of metal together. Although resistance welding is a real welding process, no filler metal, no welding gas. There is no excess metal to remove after welding. This method is suitable for mass production. The welds are solid and barely noticeable.
Historically, resistance welding has been effectively used to join high resistance metals such as iron and nickel alloys. The higher electrical and thermal conductivity of copper alloys makes welding more complex, but conventional welding equipment often has the The alloy has a good quality full weld. Beryllium copper can be welded to itself, to other copper alloys, and to steel. Copper alloys less than 1.00mm thick are generally easier to solder.
Resistance welding processes commonly used for welding beryllium copper components, spot welding and projection welding. The thickness of the workpiece, the alloy material, the equipment used and the surface condition required determine the appropriateness for the respective process. Other commonly used resistance welding techniques, such as flame welding, butt welding, seam welding, etc., are not commonly used for copper alloys and will not be discussed.
The keys in resistance welding are current, pressure and time. The design of electrodes and the selection of electrode materials are very important to ensure the welding quality. Since there is a lot of literature on resistance welding of steel, the several requirements for welding beryllium copper presented here refer to the same thickness. Resistance welding is hardly an accurate science, and welding equipment and procedures have a great impact on welding quality. Therefore, the information presented here is only indicative
South, a series of welding tests can determine the optimum welding conditions for each application.
Because most workpiece surface contaminants have high electrical resistance, the surface should be cleaned routinely. Contaminated surfaces can increase the operating temperature of the electrode, reduce the life of the electrode tip, render the surface unusable, and cause the metal to deviate from the weld area. cause soldering or slag. A very thin oil film or preservative is attached to the surface, which generally has no problem with resistance welding, and beryllium copper electroplated on the surface has the least problems in welding. Beryllium copper with excess degreased or flushing or stamping lubricants can be solvent cleaned. If the surface is severely rusted or the surface is oxidized by light heat treatment, it needs to be washed to remove the oxide. Unlike the highly visible reddish-brown copper oxide
At the same time, the transparent beryllium oxide on the strip surface (produced by heat treatment in an inert or reducing gas) is difficult to detect, but it must also be removed before welding.