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首页> 外文会议>Conference on Laser Materials Processing Vol.85e: Rapid Prototyping and Microfabrication, Nov 16-19, 1998, Orlando, FL USA >Fiber Laser - Compact Source for Micro-Welding
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Fiber Laser - Compact Source for Micro-Welding

机译：光纤激光器-紧凑的微焊接源

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摘要

Fiber lasers combine the advantages of solid-state lasers and diode lasers, such as high beam quality and high efficiency. Examinations concerning the micro-welding process were carried out with a 9 Watt CW fiber laser. The wavelength of 1100 nanometers is similar to Nd: YAG radiation, which is established in material processing. Due to the core diameter of only 8 microns and a numerical aperture of 0.08 of the collimated beam, focussing to less than 8 microns is possible. Therefore, power densities of more than 10~7 W/cm~2 are obtainable, which make processes like marking, cutting, welding or soldering of metals possible. Investigations concentrated on the welding process of metal foils with a thickness of 25 to 50 microns. Stainless steel and mild steel were overlap-welded with argon and nitrogen as shielding gas. Foils with a thickness of 25 μm, for example, were successfully welded at a speed of about 250 millimeters per minute. The stability of the process is extremely influenced by the welding speed and the shielding gas flow which affects the thermal conditions in the welding zone. In particular, slight alterations of the gas flow have much higher effects on the process than it is known from high power welding.
机译：光纤激光器结合了固态激光器和二极管激光器的优点，例如高光束质量和高效率。用9瓦连续波光纤激光器进行了有关微焊接工艺的检查。 1100纳米的波长类似于在材料处理中建立的Nd：YAG辐射。由于纤芯直径仅为8微米，准直光束的数值孔​​径为0.08，因此聚焦到小于8微米是可能的。因此，可以获得大于10〜7 W / cm〜2的功率密度，这使得诸如金属的打标，切割，焊接或软焊等过程成为可能。研究集中在厚度为25至50微米的金属箔的焊接工艺上。不锈钢和低碳钢用氩气和氮气作为保护气体进行重叠焊接。例如，以约250毫米/分钟的速度成功焊接了厚度为25μm的箔。工艺的稳定性受到焊接速度和保护气体流量的极大影响，而保护气体流量会影响焊接区域的热条件。尤其是，气流的微小变化对过程的影响要比从高功率焊接中所知的高得多。

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