焊接活性剂对低碳钢焊缝成形性能的影响

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Abstract：The penetration depth and width of the weld determine the popularity of the application of low carbon steel.Controlling the welding speed，changing the defocus amount，introducing protective gasand adjusting the welding attitude can improve the welding efect，but usually require high power laser. In this paper，the weld penetration and the grain phase morphology of the weld are improved by introducing active flux at low power. By introducing single welding aditives titanium dioxide and magnesium oxide，the weld penetration depth increased from 2 3 8 3 μ m to 2 8 2 2 μ m and 2 7 4 7 μ m ，adjusting the mass fraction of titanium dioxide and magnesium oxide in the compositeadditives，the weld penetration depth was further improved，andthe maximum penetration depth reached （204号 3 3 9 0 μ m ，which was more than 42 % higher than the weld penetration depth without welding additives.The improved welding penetration is atributed to the synergistic action of the two welding AIDS.This paper provides a general method for improving weld penetration under low power.

Keywords：low carbon steel; laser welding; low power; penetration; welding auxiliary

1序言

作为一种含碳量低的碳素结构钢，低碳钢具有表面易处理、力学性能优异和焊接性能良好等特性，其广泛应用于汽车、仪表壳、管道、化工设备等领域[1-]，其中，焊接效果决定了低碳钢的应用普及。（剩余4691字）