welding: it is a kind of manufacturing process and technology of bonding metal or other thermoplastic materials by heating, high temperature or high pressure.
welding through the following three ways to achieve bonding:
1, welding - heating the workpiece to the part fusion to a molten pool, then joined after the molten pool cooling and solidification, if necessary, can be added to the melt auxiliary, it is suitable for a variety of metal and alloy welding without pressure.
2, press welding - welding process must be applied to the welding pressure, belonging to processing of variety and part of metal materials.
3, brazing - the brazing material use the metal materials which the melting point less than the base metal, then wetting base metal by liquid solder, filling the joint gap, and with the base material mutual diffusion to achieve link welding. it is suitable for welding various materials,also suitable for welding different metal or heterogeneous materials.
there are many sources of energy for modern welding, including gas flame, arc, laser, electron beam, friction and ultrasonic. in addition to being used in the factory, welding can also be carried out in a variety of environments, such as wild, underwater and space. wherever possible, welding may be dangerous to the operator, so in the welding must take appropriate protective measures. welding to the human body may cause harm, including burns, electric shock, visual impairment, inhalation of toxic gases, excessive ultraviolet radiation and so on.
