中文
Welding technology trends:
Improve Welding Wire productivity is an important driving force to promote the development of welding technology to improve productivity through: improve weld deposition rate, for example, three-wire submerged arc welding process parameters were 220A/33V 1400A40V, 1100A45V. A small cross-section of the groove, behind the baffle or liner 50 to 60mm steel plate can be a penetration forming, welding speed can reach laminated, at 0.2 MPa, more than the deposition rate with SMAW compared the more than 100-fold The second way is to reduce the cross-section of the groove and metal cladding, over the past decade the most outstanding achievements is a narrow gap welding. Narrow-gap welding with gas shielded arc welding is based, using a single wire, twin wire, three-wire welding, butt form, can be used irrespective of the joint thickness, for example, the plate thickness is 50 to 300 mm, the gap can be designed around 13mm, so The required amount of metal deposited into multiples, reduce the number of times, thus greatly improving productivity. Narrow welding technology key is to look at how to ensure that both sides of the penetration and arc center automatically track and in the groove center line, to this end, the countries in the world to develop a variety of different programs, so we had a variety of narrow-gap welding method. One of the reasons of electron beam welding, plasma welding, laser welding, can be butt joints, and do not open the groove, so is better between the narrow gap welding method, which is extensive attention. The latest successful development of laser-arc hybrid welding method can improve the welding speed, as 5mm steel or aluminum welding speeds of up to 2 ~ 3m/min, good shape and quality, small welding deformation.
2, to improve the ready workshop mechanization, the level of automation is the direction of the current world focus on the development of the advanced industrial countries. In order to improve production efficiency and quality of the welded structure, only proceed from the welding process have some limitations, and therefore the world, especially emphasis on the technological transformation of the workshop. Preparation Workshop main processes include material transportation, material surface degreasing, sandblasting, coating to protect paint; steel scribing, cutting open groove; component assembly and tack. The above processes have adopted mechanization and automation in the modern factory. Its advantage is not only to improve the productivity of the product and, more importantly, improve the quality of the products.
Welding process automation, intelligent improve the welding quality and stability, to solve an important direction of harsh labor conditions.
4, Welding Material technology continue to promote the development of emerging industries forward. Welding technology since the invention has been a hundred years of history, it can meet almost all important products in the current industrial manufacturing needs. However, the development of emerging industries still forced Welding technology continues to advance. The development of the microelectronics industry to promote the development of micro-connection technology and equipment; Another example is the development of ceramic materials and composites for vacuum brazing, vacuum diffusion bonding. The development of aerospace technology will also promote the development of welding technology in space.
5, the heat source of research and development is the fundamental driving force to promote the development of the welding process. The welding process is almost the use of the world all available heat sources, including the flame, arc, resistive, ultrasonic, friction, plasma, electron beam, laser beam, microwave, etc. (I mainly in arc welding, resistance welding, automated welding equipment main), the history of the emergence of a heat source, are associated with the emergence of a new welding process. However, since welding heat source development and the study did not terminate.
6, energy-saving technology is well-known issues of common concern, welding consumables great energy, SMAW, for example, each approximately 10KVA, submerged arc welding machine each 90KVA, resistance welding machines up to thousands of KVA, a lot of new technology appear to achieve this energy-saving goals. Development of electronic technology in resistance spot welding, AC spot welder into a secondary rectifying spot welding machine, welder can improve the power factor to reduce welder capacity 1000KVA spot welder can be reduced to 200KVA, while throw welding can achieve the same effect. Over the past decade, the emergence of inverter welding machine is another successful example, it can reduce the weight of the welder, improve the welder power factor rate control performance, and has been widely used in the production.
