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 the welding more complicated, but conventional welding equipment usually has the The alloy has a good quality full weld. With proper resistance welding techniques, 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.
Copper alloys are easy to braze.
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, presented here as a guide only, a series of welding tests can be used to determine the optimum welding conditions for each application.
Because most workpiece surface contaminants have high electrical resistance, surfaces should be cleaned routinely.
The surface will increase the operating temperature of the electrode, reduce the life of the electrode tip, make the surface unusable, and make the metal
Deviating from the welding area, causing false welds or residues at the welded joints. A very thin oil film or corrosion inhibitor is attached to the surface, and generally there is no problem with resistance welding. The beryllium copper electroplated on the surface has the most problems in welding.
few.
Beryllium copper with excess non-greasy or flushing or stamping lubricants can be solvent cleaned. If the surface is rusted
Severely corroded or lightly heat treated surface oxidizes, and 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.