Welding knowledge

In recent years, the development of aerospace, transportation, Marine engineering and other industries has greatly promoted the development of welding technology. With the variety of products, structures, materials and conditions of use, the requirements for welding quality are getting higher and higher, and the welding workload is gradually rising. According to statistics, China's welding workload has reached the level of the world's welding power. Therefore, an efficient welding method to improve welding production efficiency and welding quality and reduce welding defects has become an urgent requirement for actual production. At present, a large number of efficient welding methods and combinations of different welding processes have been applied in a variety of different production processes.

  Improving welding production efficiency, on the one hand, in order to reduce welding costs, improve welding production efficiency, from a certain point of view, is mainly measured by the melting amount of filling metal melting speed per unit time. However, increasing the deposition speed means an increase in the heat input, and for the use of single arc welding, in order to prevent welding deformation caused by the increase in heat input, it is generally used to increase the welding speed. However, due to the increase of welding speed, it is easy to produce defects such as discontinuity and edge biting, which can be avoided by using double arc welding. At present, from the domestic and foreign research status of double arc welding technology, according to the type and position of the arc, its research mainly focuses on three aspects: single-side double arc welding, compound double arc welding, double-side double arc welding.