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首页> 外文会议>International Congress on Applications of Lasers and Electro-Optics >THE MICRO-WELDING ABILITY OF 100W HIGH BRIGHTNESS FIBRE LASER ON 316L STAINLESS STEEL
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THE MICRO-WELDING ABILITY OF 100W HIGH BRIGHTNESS FIBRE LASER ON 316L STAINLESS STEEL

机译：100W高亮度光纤激光器在316L不锈钢中的微焊能力

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摘要

Fibre lasers are an attractive option for laser micro-welding applications because of their high beam quality which gives a small spot size. In this paper, the results of an investigation into the micro-welding of stainless steel using a 100 W fibre laser are reported. Continuous and pulsed modes of operation were investigated in terms of penetration depth, top bead width and focus position sensitivity. For the continuous mode, penetration depths of 550 μm were obtained at welding speeds of 5 mm/s. When the welding speed was increased to 30 mm/s the penetration depth was still greater than 400 μm. In the pulsed welding mode, the pulse duration and frequency were varied to give duty cycles of 10% and 50%. There was a significant increase in the penetration depth when the pulse duration was less than 0.5 ms (with the 50% duty cycle) due to the pulse enhancement of the laser at the very short pulse durations. At the same time, the top bead width reduced by over 50% for the lowest pulse duration (0.05 ms) giving a weld with an aspect ratio of 11:1. The fast cooling rate in the short pulse weld changes the final microstructure to pure austenite rather than austenite with ferrite which was obtained with the continuous mode laser welds. In all cases, the deep penetration conditions were very sensitive to focus position.
机译：光纤激光器是激光微焊接应用的有吸引力的选择，因为它们具有小光束质量，可提供小点尺寸。本文报道了使用100W光纤激光器对不锈钢微焊接的研究结果。在穿透深度，顶部珠宽度和聚焦位置灵敏度方面研究了连续和脉冲的操作模式。对于连续模式，在5mm / s的焊接速度下获得550μm的渗透深度。当焊接速度升至30mm / s时，渗透深度仍然大于400μm。在脉冲焊接模式中，脉冲持续时间和频率变化，使占空比为10％和50％。由于激光器在非常短的脉冲持续时间内，当脉冲持续时间小于0.5ms（具有50％占空比）时，渗透深度显着增加。同时，最低脉冲持续时间（0.05ms）的顶部珠子宽度降低了50％以上，宽度为11：1的纵横比。短脉冲焊缝的快速冷却速率将最终的微观结构改变为纯奥氏体而不是用铁素体与连续模式激光焊接获得的铁氧体的奥氏体。在所有情况下，深度渗透条件对焦点位置非常敏感。

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