不同焊接速度对AH36钢激光-电弧复合焊熔滴与熔池动态行为影响研究

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Abstract：The effects of laser-MIG hybrid welding on 4mm -thickAH36 steel at different welding speeds is investigated through numerical simulation and high-speed photography. The research revealed that： At 20mm/s the process was dominated by unstable short-circuit transfer; At 30mm/s ，amixed transfer mode of jet and globular transitions emerged with improved stability; At 40mm/s ， stable jet transfer became predominant. Under low welding speed 20mm/s ，the fluid temperature fluctuated between 1425K and 18OoK with significant temperature gradient variations，accompanied by molten pool fluctuations and vortex flow velocities of 3.75～5.0m/min .Conversely， at high welding speed 40mm/s） ，the fluid temperature stabilized at 175oK with reduced vortex flow velocities of 1.25～2.5m/min ，and the molten pool exhibited enhanced stability under surface tension effects.

Keywords：laser-archybridwelding;weldingspeed;vortexvelocity

1序言

在全球船舶制造格局调整的背景下，AH36钢凭借高强度、良好的低温韧性和优异的焊接性能，成为船舶核心结构件（如舱壁、舷侧外板、甲板）的关键材料[1]。（剩余5513字）