Copper and copper alloys because of its excellent electrical conductivity, ductility and thermal conductivity in the industry has a large number of applications, copper connection is mainly riveted and welded, brazing, resistance welding, laser welding, etc., and now the rapid development of resistance welding technology has long since solved the difficulties in welding copper, this article focuses on copper and copper alloy welding applications in the resistance welding, to help you open the Cognition, recognize more welding process.
Resistance spot welding in the application of copper welding
Resistance welding is mainly through the contact resistance between the workpiece to heat melting to form a molten core, and the conductivity of copper is very good, so the spot welding of pure copper in addition to a small wiring harness and copper sheet welding is more appropriate. Conventional copper spot welding weldability general, and with the increase in alloy composition spot welding performance has improved, such as zinc-copper alloy (brass), nickel-copper alloy (white copper) weldability is much better. Through the preferred electrode material and customized electrode shape, coupled with the medium frequency inverter DC welding machine, with the addition of DC current output, you can achieve better spot welding production. For example, in the production of switch components, through the use of beryllium copper electrodes and 45º cone electrode, can achieve a stable mass production of brass 0.8mm + 0.8mm, the molten core can be guaranteed in ¢3mm or more, is the current mainstream welding production process of thin copper sheet.
Application of resistance brazing in copper welding
resistance brazing because of its high heat generation efficiency, small heat-affected zone, without the need for external heat source and other characteristics, in low-voltage electrical, switching components and other scenarios have a wide range of applications, whether it is paste or sheet brazing material in the resistance soldering process can be used in the application of automated production, paste brazing material using a gluing machine quantitative spraying, sheet brazing material using automatic conveyor cutting one-length completion; soldering machine using intermediate-frequency or frequency can be normal production, brazing electrode need to use high resistance and high temperature materials, such as tungsten and molybdenum and its alloys, as well as graphite, the welding process electrode and copper parts need to be fully heated, so that the brazing material can be fully melted to flow to produce infiltration, and hold pressure for a certain period of time to ensure that the copper parts can be fully affixed to the weld; brazing material, if it is a copper-based, the electrode and the workpiece heating temperature to reach 600 degrees, and commonly used silver-based brazing material needs to be increased to 700 degrees, the temperature is about 600 degrees. The commonly used silver-based brazing material needs to rise to about 700 degrees to ensure that the silver-based brazing material is fully melted to achieve the brazing effect.
The application of resistance diffusion welding in copper welding
is mostly used in the forming welding of multi-layer copper foil, using graphite electrode to introduce welding heat, and providing larger welding current and welding pressure through the welding machine, so that the copper foil can realize molecular bonding connection under pressure, and ultimately realize the welding of multi-layer copper foil; no solder is needed in the process, so as to realize the no-trace welding, and it is widely used in the electric power and the soft connection of the electric car, etc. The general heating temperature is not lower than 600 degrees. General heating temperature is not less than 600 degrees, the pressure is mostly hydraulic, servo pressurization, etc., to achieve high temperature and high pressure state of the diffusion welding.
The above is about resistance welding machine in welding copper and copper alloy some process knowledge guide, resistance welding in welding certain parts than the traditional welding process has obvious advantages, especially in welding large quantities of parts or the need to realize the automation of welding, resistance welding is your first choice of process. If you want to know more about resistance welding, please contact us, our engineers will be online for you to answer your questions.
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