Compared to copper alloys and aluminum alloy, the resistivity slightly higher and slightly lower thermal conductivity, so the spot is not too difficult. Thickness less than 1.5mm of copper alloys, especially low-conductivity copper alloy used in the production of the most extensive. High conductivity copper, spot welding more difficult.
Usually increases in the shim between the electrode and the workpiece, or use the power of extreme head embedded in the tungsten composite electrode, in order to reduce the heat to the electrodes. Tungsten diameter is usually 3-4mm.
Welding of high conductivity copper and brass and bronze, they generally do with a class of electrode alloy electrode for welding low conductivity brass, bronze and copper-nickel alloy, the use of Class 2 welding electrodes alloy. Tungsten can also be embedded in welded copper welding electrode. The poor thermal conductivity of tungsten, it can use much smaller welding current, commonly used on medium-power welder spot welding, but the adhesion of tungsten electrode and the workpiece easily affect the appearance of the workpiece. The following two tables for the spot welding conditions brass.
Laser Welding Wire will be used next in what way? There are two answers: one is the evolution, improvement of existing technologies. This means that for the development of laser welding will be a new laser source - fiber laser, which is a flexible fiber with the laser resonator, the input energy ratio is much higher than the output energy, the whole device more compact. Another benefit of high-power fiber laser module is built, many power about 300 ~ 500W fiber resonator, in case of technical loopholes, the replacement of a suitable module is very easy. In this case, the laser work a long time, so do not need to be equipped with a trained technician.
The other is the resistance in some areas based stud welding laser welding is described - "Alternate Dragon welding", when the welding work for more than 50% of the time, the laser welding device is more economical. In the application, resistance stud welding is now being applied to solve this problem is an alternate configuration provides two laser welding. When a configuration of the welding is running, head down to another configuration at a welding position handle moves, after which the laser will be transferred to another welding configuration, this technology has been the introduction of ThyssenKrupp.
However, in addition to the auto makers will be a completely new type of welding the world revolutionized the field of welding technology, such as friction welding. Its advantage is only necessary to weld the two parts can be low energy input, and heat distortion low. As the temperature is very low, so the weld will not be hard than the material. But there are also disadvantages: the high intensity pressure and rapid rotation requirements must be well fixed to live metal parts. Currently, only a few companies using the technology for Carbon Steel Welding Electrode. But no matter from which point of view, laser welding technology welding technology will be the future direction of development of the body!