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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Elucidation of high- power fibre laser welding phenomena of stainless steel and effect of factors on weld geometry
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Elucidation of high- power fibre laser welding phenomena of stainless steel and effect of factors on weld geometry

机译：阐明不锈钢的高功率光纤激光焊接现象及其对焊接几何形状的影响

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摘要

The fibre laser has been receiving great attention due to its advantages of high efficiency, high power and high beam quality, and is expected to be one of the most desirable heat sources for high-speed and deep-penetration welding. In this study, therefore, in bead-on-plate welding of Type 304 stainless steel plates with 6 kW fibre laser, the effects of laser power, power density and welding speed on the formation of sound welds were investigated with four laser beams of 130, 200, 360 and 560 mu m in spot diameter, and their welding phenomena were clarified with high-speed video cameras and an x-ray transmission real-time imaging system. The weld beads showed a keyhole type of penetration at any diameter, and the maximum penetration of 11 mm in depth was obtained at 130 mu m spot diameter and 0.6m min(-1) welding speed. It was found that the laser power density exerted a remarkable effect on the increase in weld penetration at higher welding speeds, and sound partially penetrated welds without welding defects such as porosity, underfilling or humping could be produced at wide process windows of welding speeds between 4.5 and 10m min(-1) with fibre laser beams of 360 mu m or 560 mu m in spot diameter. The high-speed video observation pictures and the x-ray images of the welding phenomena at 0.6 m min(-1) welding speed and 360 mu m spot diameter show that a sound weld bead was formed owing to a long molten pool suppressing and accommodating spattering and a stable keyhole generating no bubbles from the tip, respectively.
机译：光纤激光器由于其高效率，高功率和高光束质量的优点而受到了广泛的关注，并有望成为高速和深穿透焊接的最理想的热源之一。因此，在这项研究中，在使用6 kW光纤激光器对304型不锈钢板进行珠焊时，研究了130的4束激光束对激光功率，功率密度和焊接速度对声焊缝形成的影响。直径分别为200、360和560μm，并且它们的焊接现象已通过高速摄像机和X射线透射实时成像系统得以澄清。焊珠在任何直径下都显示出钥匙孔类型的熔深，在130μm的焊点直径和0.6m min（-1）的焊接速度下，最大熔深为11 mm。结果发现，激光功率密度在较高的焊接速度下对增加焊缝熔深有显着影响，并且在4.5到4.5的较宽的工艺窗口内，可以产生无焊接缺陷（例如气孔，底部填充或隆起）的部分渗入的焊缝直径为360μm或560μm的光纤激光束为10m min（-1）。高速视频观察图片和在0.6 m min（-1）焊接速度和360μm光斑直径下的焊接现象的X射线图像显示，由于抑制和容纳了较长的熔池，形成了良好的焊缝飞溅和稳定的锁孔，分别从尖端不产生气泡。

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