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首页> 外文期刊>Welding Design & Fabrication: The International Magazine of Welding and Fabricating Technology >Pulsed for high precision/Pulsed-Nd:YAG lasers pack just the right pulse for high-precision applications
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Pulsed for high precision/Pulsed-Nd:YAG lasers pack just the right pulse for high-precision applications

机译：脉冲用于高精度/脉冲Nd：YAG激光器可为高精度应用提供正确的脉冲

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Until recently, tight tolerances and thermal distortions have made laser microprocessing of metals difficult at best. However, improvements in pulsed-Nd:YAG lasers are letting manufacturers tackle microwelding, microdrilling, and microcutting jobs with higher efficiency than previously possible. Both Nd:YAG lasers (neodymium:yttrium aluminum garnet) and CO_2 lasers can thermally affect materials being processed. Side effects include heat-affected zones (HAZ) where material structure and metallurgical properties are modified, leading to corrosion risk, change in hardness, and heat-related deformation. Others are recast (slag, dross) on the processed surfaces, and heat diffusion to sensitive adjacent components. But unlike CO_2 or continuous-wave (CW) Nd:YAG lasers, pulsed-Nd:YAG systems minimize these thermal effects by adapting pulse length and pulse form to closely match specific process qualities. Unlike CW, pulsed-Nd:YAGs peak power can reach far above 20 kW to provide large aspect ratios (the ratio of depth to width of holes, cuts, or welds) at low average power, typically below 1 kW. Also, compared to CO_2 lasers, which work at about 10 mu in the. mid-infrared range, pulsed Nd:YAGs operate at near-infrared wavelengths of 1.06 mu These shorter wavelengths let the laser beam focus more precisely than CO_2 lasers.
机译：直到最近，严格的公差和热变形使金属的激光微加工至多困难。但是，脉冲Nd：YAG激光器的改进使制造商能够以比以前更高的效率处理微焊接，微钻孔和微切割作业。 Nd：YAG激光器（钕：钇铝石榴石）和CO_2激光器都可以热影响被加工的材料。副作用包括热影响区（HAZ），材料结构和冶金性能被修改，从而导致腐蚀风险，硬度变化和与热有关的变形。其他的则在加工过的表面上重铸（炉渣，渣dro），并热扩散到敏感的相邻组件上。但是与CO_2或连续波（CW）Nd：YAG激光器不同，脉冲Nd：YAG系统通过调整脉冲长度和脉冲形式以使其与特定工艺质量紧密匹配，从而将这些热效应最小化。与CW不同，脉冲Nd：YAG的峰值功率可以达到20 kW以上，从而以较低的平均功率（通常低于1 kW）提供较大的纵横比（孔，切口或焊缝的深度与宽度之比）。而且，与CO_2激光器相比，该激光器工作在10微米左右。中红外范围内，脉冲Nd：YAG脉冲在1.06μm的近红外波长下工作。这些较短的波长使激光束比CO_2激光器聚焦更精确。

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