Three common welding processes
There are many classification methods for welding, which can be divided into fusion welding, pressure welding and brazing according to their process characteristics
1. Fusion welding
Fusion welding is the abbreviation of fusion welding. It is a method to heat the joint part of two weldments to the melting state, join (or not participate in) filler metal, and make it cool and condense into a whole without pressure, so as to complete the welding. Gas welding, shielded metal arc welding, submerged arc welding, Co: gas maintenance welding, ammonia arc welding (tungsten argon arc welding, melting electrode argon arc welding), electroslag welding, electron beam welding, laser welding, plasma arc welding and other welding methods belong to fusion welding. During fusion welding, two weldments, welding rod, welding wire and other filler metals constitute the welding area, which is heated and melted by various heat sources such as oxyacetylene combustion heat, arc heat, resistance heat, and heat energy converted from electron beam kinetic energy to form a high-temperature molten pool. Under the maintenance of slag, submerged arc welding flux, CO2 gas, ammonia gas and various maintenance gases, atoms are fully dispersed and combined, and the molten pool is gradually cooled and condensed to form a complete and solid weld.
2. Pressure welding
Pressure welding is a welding method that combines two Weldments by applying pressure to the weldment. There are two methods for this kind of welding: one is to heat the touching part of the metal to be welded to the plastic state or melting state, and then apply pressure to complete the combination of metal atoms to form a solid joint, such as resistance welding and friction welding; the other is to make the atoms of the touch parts of the two weldments close to each other without heating, so as to obtain the junction Solid welding joint, such as cold pressure welding, blasting welding, etc.
Brazing is a welding method in which the filler metal with lower melting point is heated to the melting state when the weldment is not melted, and then filled into the gap of the weldment to disperse with the welded metal to achieve the bonding between the metals. According to the different filler metals used, brazing can be divided into tin welding, copper welding, silver welding, etc.; according to different methods of heating solder, brazing can be divided into flame brazing, soldering iron brazing, furnace brazing and high frequency brazing.
In the three kinds of welding methods, the most commonly used is fusion welding. Resistance welding in pressure welding is widely used in automobile manufacturing industry. Brazing is widely used in the production of electronic components.
This article comes from the manual welding equipment of water tank http://www.abbzs.com/