| 变焦-临界穿透束流极值法测量电子束流动态焦点——一种焦点测量方法介绍 |
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| 引用本文： | 周琦,刘方军,关桥. 变焦-临界穿透束流极值法测量电子束流动态焦点——一种焦点测量方法介绍[J]. 焊接学报, 2004, 25(5): 77-79,84 |
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| 作者姓名： | 周琦 刘方军 关桥 |
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| 作者单位： | 1. 中国兵器科学研究院浙江宁波分院,浙江,宁波,315103;北京航空航天大学,北京,100083
2. 北京航空制造工程研究所,北京,100024 |
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| 基金项目： | 国防科技重点实验室基金资助项目(51461030101HK0101);宁波市青年基金资助项目 |
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| 摘 要： | 通过试验研究发现了电子束焊接过程中工件传导电流的传导比均值与输入束流的函数规律，函数的极大值是电子束焊接动态过程工件被穿透的临界状态转变点。利用电子束焊接过程的临界穿透束流特性，讨论了电子束受金属蒸气影响后的焦点状态与漂移空间传输的电子束焦点状态存在不同特性，提出了一种测量电子束焊接过程动态焦点的方法，变焦-临界穿透束流极值焦点测量法。
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| 关 键 词： | 工件传导电流 临界穿透 传导比 动态焦点 电子束焊接 |
| 文章编号： | 0253-360X(2004)05-77-04 |
| 收稿时间： | 2003-08-18 |
Method of varying focus-extremum of critical penetrating current measuring electron beam dynamic focal spot |
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| ZHOU Qi,LIU Fang-jun and GUAN Qiao. Method of varying focus-extremum of critical penetrating current measuring electron beam dynamic focal spot[J]. Transactions of The China Welding Institution, 2004, 25(5): 77-79,84 |
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| Authors: | ZHOU Qi LIU Fang-jun GUAN Qiao |
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| Abstract: | With studying conduction current of workpiece, the rules between average ratio of conduction current of workpiece and electron beam current are discovered. The peak of average ratio of conduction cur rent corresponds to the transferring point of critical penetration in the dynamic process of electron beam welding. By the characteristics of critical penetration current, the focusing states of electron beam influenced by metal vapor and transmitting in drift space are discussed. The concept of dynamic focal spot of electron beam is put forward. The method of meas ureing dynamic focal spot of electron beam is invented, through varying focus-extremum of critical penetrating current. |
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| Keywords: | conduction current of workpiece critical penetration ratio of conduction current dynamic focal spot electron beam welding |
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