電子ビーム溶接の溶込み深さに関する研究(第 2 報) : パルスビームによる溶込み深さの成長過程の観察(その 2)

概要

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With the same electron beam welder as described in the report 1,rectangular pulse beams of various duration time were incidented on pure aluminum, aluminum alloy, copper, brass and mild steel under the nearly same other welding conditions and growing process of cavity or penetration depth was observed. The results are summerized as follows; 1) In all metals used, there is a cavity formed rapidly. This penetration speed depends largely upon energy density of electron beam. 2) The penetration depth in usual welding is decided not only by the drilling action but also by movement of metal. 3) Comparing among metals of the same matrix, the metal containing volatile elements shows more considerable drilling phenomenon than a pure metal. Whereas shape of the cavity in a pure metal corresponds to higher portion of electron beam energy distribution, that in its alloy corresponds to lower 4) Until a certain short welding time, weld penetration depth in rest metal is the same as that in moving metal. This is resulted from the fact that the diameter of electron beam is not infinitesimal and penetration speed of welding is much higher than welding speed so that all specimens are apparently rest until at that time. 5) Weld penetration depth h_p in all metals except mild steel increases with respect to welding time τ approximately according to h_p=C_1τ^α (C_1 and α are independent of τ, 0<α<1).
1977-08-05