VW Experts believe the company's materials: Compared with the pure laser Welding Electrode, laser hybrid welding of sheet metal parts can be greatly improved connectivity gap. So that the VW company can more fully utilize high-speed laser welding arc welding process stability. Another application example is the BMW 5 Series BMW aluminum partitions using this laser hybrid welding technology and high-pressure deformation processing of aluminum alloy frame welded together.
With a variety of laser welding technology alone compared to the laser hybrid welding technology has significant advantages. For the laser mixture, the advantage is mainly reflected in: a greater penetration / large gap welding capabilities; weld toughness better, by adding supplementary materials can be organized to exert influence on weld lattice; no burn-through when the weld on the back sagging phenomenon; applies more broadly; the help of laser technology investment less replacement. Inert gas to the laser MIG hybrid welding, the advantage is mainly reflected in: the higher the welding speed; fusion great depth; generate less heat welding; weld strength; weld width is small; weld protruding small. Making the production process of the whole system stability, availability of good equipment; weld seam welded for processing workload and the workload is small; welding and shorter, low cost, high efficiency; has good optical properties of device configuration .
However, laser hybrid welding in the power equipment investment costs are relatively high. With the further expansion of the market, the price of power supply will decline, and the laser hybrid welding technology in more applied areas. At least the laser hybrid welding technology in welding of aluminum alloy is a very suitable welding process, a longer period of time will become a major welding tools.
1, carbon steel and ordinary steel laser welding. Overall, good effect of laser welding of carbon steel, the welding quality depends on the impurity content. The same as other welding process, sulfur and phosphorus are the welding crack sensitive factors. In order to obtain a satisfactory weld quality, the carbon content exceeds 0.25%, need to warm up. When different carbon content of each Welding Electrodes, welding torch can be a little biased side of a low-carbon materials, to ensure joint quality. Low-carbon rimmed steel as sulfur and phosphorus content, not suitable for laser welding. Low-carbon killed steel due to low levels of impurities, welding results are good. Medium and high carbon steel and ordinary steel can be well laser welding, but welding preheat and post-processing required to eliminate stress, to avoid crack formation. 2, stainless steel, laser welding. Under normal circumstances, stainless steel laser welding is more easily accessible than conventional high-quality welding joints. Due to the high speed welding heat affected zone is very small, sensitization does not become an important issue. Compared with carbon steel, stainless steel and low coefficient of thermal conductivity is more easy access to narrow deep penetration weld. 3, laser welding between different metals. Laser welding of high cooling rate and the small heat-affected zone, for many different metals have different melting soldering material structures created favorable conditions for compatibility. The following has been proved that metal could be conducted smoothly laser deep penetration welding: stainless steel ~ low carbon steel, 416 stainless steel, 310 stainless steel, 347 stainless steel ~ HASTALLY nickel alloy, nickel electrodes ~ cold-forged steel, nickel content of different two-metal band. Laser welding technology and performance characteristics