离焦量是激光焦点离作用物质间的距离。在焊接过程中，离焦量对焊接质量的影响很大。激光焊接通常需要一定的离焦量，因为激光焦点处光斑中心的功率密度过高，容易蒸发成孔。离开激光焦点的各平面上，功率密度分布相对均匀。
...eAdmin CMS 关键词：大型结构件；离焦量；拼接焊缝；灰度累加 [gap=1141]Key words：large scale structure；defocus distance；seam stitching；gray accumulation ...
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离模剂：mo(u)ld parting agent,releasant,release agent,releasing agent,release medium 离焦量：defocusing distance 离尘机：dust separator ..
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机械英汉双语词汇学习 681 回帖奖励-网络课堂,... ... 焦斑直径focussed diameter of the beam 离焦量clearance between focal point and (plate) surface 焊缝深宽比weld seam depth-to-width ratio ...
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结果表明：只有采用合适的离焦量，才有可能获得较好的焊缝成形质量。
Experimental results showed that reasonable defocusing value should be adopted in order to get better weld seam shaping quality.
文中还对锐聚焦系统给出了最佳归一化离焦量的表达式和相应的ETF近似公式。
For sharp-focusing system, the expressions for the position of optimum image plane and its corresponding ETF are also given.
研究了激光焊接输出功率、焊接速度、离焦量等工艺参数对焊接深度及焊接宽度的影响。
The effects of laser power? speed and defocusing parameter on welding depth and width have been studied in the experiment.
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