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{sup}7 W/cm{sup}2 are obtainable, which make processes like marking, cutting, welding or soldering of Metalspossible [2, 3]. 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 25μm, 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.
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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CW光纤激光进行微焊接过程的考试。 1100纳米的波长类似于Nd：YAG辐射，其在材料加工中建立。由于芯直径仅为8微米和准直光束的0.08的数值孔径，可以聚焦到小于8微米。因此，可以获得大于10 {SUP} 7 W / cm {SUP} 2的功率密度，其使得MetalsPossible的标记，切割，焊接或焊接等工艺进行制造类似的方法[2,3]。浓缩在金属箔的焊接过程中的研究，厚度为25至50微米。不锈钢和温和钢用氩气和氮气重叠，作为屏蔽气体。例如，厚度为25μm的箔以约250毫米/分钟的速度成功焊接。该过程的稳定性受到影响焊接区中的热条件的焊接速度和屏蔽气流的影响。特别地，气流的轻微改变对该过程的效果远远高于高功率焊接的过程。
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