It’s not just welding, it’s these

Hot air welding is also called hot air welding. Compressed air or inert gas (usually nitrogen) is heated to the desired temperature by a heater in a welding torch and sprayed onto the plastic surface and welding strip so that the two are fused and combined under moderate pressure. Oxygen sensitive plastics (such as polyphthalamide) should use inert gas as heating medium, other plastics generally use filtered air. This method is often used for the welding of polyvinyl chloride, polyethylene, polypropylene, polyformaldehyde, polystyrene, carbonated vinegar and other plastics. Hot-press welding is the use of heat and pressure, so that the wire and metal welding zone pressure welding together. Its principle is through heating and pressure, so that the welding zone metal plastic deformation, at the same time destroy the oxide layer on the pressure welding interface, so that the pressure welding wire and metal contact surface to reach the gravity range of atoms, so that the attraction between atoms, to achieve the purpose of bonding. Hot plate welding adopts suction plate structure, and the heat of heating plate machine is transferred to the welding surface of upper and lower plastic heating parts by electric heating method. Make its surface melting, and then the heating plate machine quickly exit, so that the upper and lower two pieces of heating after the melting surface fusion, curing, together as one. The whole machine is in frame form, composed of three large plates: upper template, lower template and hot template, and equipped with hot mold, upper and lower plastic cold mold, the action mode is pneumatic control. Ultrasonic metal welding uses high frequency vibration wave to transfer to two metal surfaces to be welded. Under pressure, the two metal surfaces rub against each other to form fusion between molecular layers. Its advantages are fast, energy saving, high fusion strength, good electrical conductivity, no spark, close to cold processing; The disadvantages are that the welding metal should not be too thick (generally less than or equal to 5mm), the welding spot should not be too large, and pressure is required. Laser welding is an efficient and precise welding method using high energy density laser beam as a heat source. It is one of the important applications of laser material processing technology. A continuous laser beam is used to connect the materials, and the metallurgical physics is very similar to electron beam welding, that is, the energy conversion mechanism is accomplished through a “key-hole” structure. The equilibrium temperature in the cavity reaches about 25000C, and the heat is transferred from the outer wall of the high temperature cavity to melt the metal surrounding the cavity. The hole is filled with high-temperature steam generated by continuous evaporation of wall material under light beam irradiation. The light beam continuously enters the hole, and the material outside the hole flows continuously. As the light beam moves, the hole is always in a stable state of flow. A weld is formed when molten metal fills the space left by the opening and condenses. Brazing is a welding method in which the filler metal (solder) whose melting point is lower than that of the workpiece to be connected is heated to higher than the melting point so that it has sufficient fluidity. It is fully filled between two workpiece by capillary action (called infiltration) and jointed after its solidification. Traditionally, temperatures above 800 ° F (427 ° C) in the United States are called brazing (brazing) and vice versa. Manual welding is a welding method performed by holding a torch, welding torch or welding tongs. Resistance welding is a manufacturing process and technology for heating metal or other thermoplastic materials such as plastics. It is a welding method by applying pressure through electrodes after workpiece combination and using electric current through the resistance heat generated by the contact surface and adjacent area of the joint. Friction welding is a solid phase welding with mechanical energy. The heat generated by the friction of the workpiece face is used to make it reach the plastic state, and then the welding method is completed by top forging. Electroslag welding is the use of electric current, through the resistance heat generated by the slag as a heat source, the filling metal and the base material is melted, after solidification to form a firm connection between metal atoms. At the start of welding, welding wire and welding groove short-circuit arc starting, constantly add a small amount of solid flux, use of arc heat to melt, forming liquid slag, slag reach a certain depth, increase welding wire feeding speed, and lower voltage, make the welding wire is inserted into the slag pool, arc extinguishing, thereby to electroslag welding welding process. Electroslag welding mainly includes nozzle electroslag welding, non-nozzle electroslag welding, wire electroslag welding, plate electroslag welding and so on. Its disadvantages are that the input heat is large, the joint stays for a long time at high temperature, and it is easy to overheat near the weld. The weld metal has a coarse crystallized as-cast structure, and the impact toughness is low. The welding parts generally need to be normalized and tempered after welding. High-frequency welding uses solid resistance heat as energy source. During welding, the resistance heat generated by high-frequency current in the workpiece heats the surface of the workpiece welding zone to a molten or nearly plastic state, and then applies (or does not apply) the forging force to achieve the metal bonding. Riveting refers to the process of joining two plates or objects together by making holes in their parts and then putting the rivets in and killing them with a riveting gun A connection that has been heated to the melting point of a liquid.铜焊丝,Copper Welding Rods,铝焊丝,aluminium welding wire,镍焊条,Nickel electrode,药皮焊条,Flux Coated Brazing Welding Rods