電子ビーム電流による溶込み深さの制御 : 電子ビーム溶接の溶込み深さに関する研究(第 8 報)

概要

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In order to obtain fundamental data for control of weld penetration depth in electron beam welding, responsibility of the depth to the variation in the beam current and its limit value were investigated. In the experiments, linear current variations with time were selected for easy analysis of the experimental results. Results are summarized as follows : 1) Response of the depth to increase of the beam current is worse than that to decrease. Especially, under the conditions of lower welding speed and larger beam diameter, that is, when more amount of molten metal exists, the difference in both responsibilities becomes more remarkable. 2) When a focused beam is adopted, the depth varies proportionally to the beam current in the range less than 500mA/sec. 3) When the beam current pulsates across a DC value, the limit of pulsation of the depth in the macroscopic view is f_r, that is, the characteristic frequency of the intermittent melting process of the electron beam as described in the previous report. 4) From the results above mentioned, spike phenomenon in the root of penetration could be suppressed by control of electron beam current keeping the macroscopic shape of fusion zone constant.
社団法人溶接学会の論文
1983-03-05