The method of welding
Hebei nozzle small make up tell you welding method
Welding technology is mainly used on the metal base, commonly used electric arc welding, argon arc welding, CO2 protection welding, oxygen - acetylene welding, laser welding, electroslag pressure welding, such as plastic and other non-metallic materials for welding. Metal welding method has more than 40 kinds, mainly divided into fusion welding, pressure welding and brazing three categories.
Welding is heated to melt in welding process, the workpiece interface state, do not add pressure to complete welding method. Fusion welding, the heat will stay two welding workpiece interface heat melting rapidly, forming molten pool. Molten pool with heat source moving forward, continuous weld is formed after cooling and connect the two artifacts as a whole.
In the process of welding, if direct contact with the molten pool of high temperature, atmospheric oxygen in the atmosphere will be metal oxide and various alloy elements. Into the molten pool, such as nitrogen, water vapor in the atmosphere will be in the subsequent cooling process in the formation of porosity in the weld defects such as cracks, slag inclusion, and deterioration of weld quality and performance.
Bonding is under the condition of pressure, make the two artifacts in solid state bonding between atoms, also called solid-state welding. Commonly used is the butt welding, pressure welding process when a current flows through the connection end of the two artifacts, it due to the resistance being very high temperatures, when heated to a plastic state under axial pressure is connected as a whole.
The common characteristics of all kinds of pressure welding method is in the process of welding pressure and without filler material. Most bonding methods such as diffusion welding, high frequency welding, cold welding, such as no melting process, there is no useful alloying elements burning, such as welding and harmful elements into the problem of weld, simplifying the welding process, also improved the welding safety and health conditions. At the same time due to the heating temperature is lower than fusion welding, short heating time, thus small heat affected zone. Many difficult to melt welding welding materials, often can use pressure welding welded and the parent metal the same strength of high quality connectors.
