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