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Harness welding knowledge
The traditional beam welding process are: welding, brazing, welding.
1) in the process of welding is heated to melt the workpiece interface state of welding, without pressure to complete the welding method. When welding, heat welding the two workpieces to be at the interface of rapid heating and melting, forming a molten pool. The weld pool moves along with the heat source, which is formed after cooling and forming a continuous weld, and the two parts are connected to one. Due to welding, wire harness junction is formed by the combination of welding, welding in spathelike resistance, greatly reduces the service life of the wire harness. And in the welding process, if direct contact with the atmosphere and high temperature of the molten pool, atmospheric oxygen will be oxidized metal and alloy elements. The nitrogen and water vapor in the atmosphere can enter into the molten pool, but also in the subsequent cooling process in the formation of pores, slag, cracks and other defects, the deterioration of the quality and performance of the weld.
2) the brazing is the use of lower melting point than the piece of metal for brazing, the workpiece and a solder heating is higher than the melting point of the solder, below the melting point of the workpiece temperature, the use of solder wetting liquid workpiece, filling gap interface and with the workpiece to achieve interdiffusion of atoms, so as to realize the welding method.
The joints formed during welding are known as welds in the joints of the two bodies. Both sides of the weld are affected by welding heat, and the microstructure and properties are changed, which is called the heat affected zone. Welding for the workpiece material welding material, welding current, welding in the weld and heat affected zone may produce overheat, embrittlement, quench hardening or softening phenomenon, but also the weldment performance degradation and deterioration of welding. The need to adjust the welding conditions, welding preheating before welding pieces of the interface, welding heat and post weld heat treatment can improve the welding quality of welding.
3) pressure welding is in the condition of the pressure, so that the two parts of the workpiece in the solid state to realize the combination of atoms, but also known as solid state welding. Pressure welding process is commonly used in resistance welding, when an electric current passes through two workpiece end connection, the registry for a high resistance and temperature rise, when heated to a plastic state, under the action of axial pressure connected into a whole.
The common characteristic of all kinds of pressure welding method is to put pressure on the welding process and not to fill the material. Most welding processes such as diffusion welding, high frequency welding, cold pressure welding are not melting process, so there is no useful like welding that burning loss of alloy elements, and the harmful elements penetrated weld, in order to simplify the welding process, but also improve the welding safety and health conditions. At the same time as the heating temperature is lower than welding, heating time is short, so the small heat affected zone. Many materials that are difficult to be used in fusion welding can often be made of high quality joints with the same strength as the base metal.
To sum up, the pressure welding must replace welding, brazing process of welding wire harness into the mainstream.