高エネルギービームによる溶接特性(第3報) : 炭酸ガスレーザによるアルミニウムの溶込み形成

概要

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As the third report of serial studies on welding by high energy beams, penetration mechanisms by carbon dioxide gas laser for aluminum were discussed. Bead-on-plate tests were carried out in various shielding gases, and the cross-sectional shapes of the welds were measured. The fundamental welding characteristics for aluminum by laser beam were estimated in comparison with that by an electron beam and for steels by laser beam. The results obtained are as follows. (1) The chemical reaction between active shielding gas and aluminum is restricted on the molten pool suface, and does not increase beam absorption efficiency in the key hole to form deep penetration. But the chemical compound generated on the surface decreases the threshold beam power to enter fusion of aluminum. (2) Aspect ratio of penetration and melting efficiency for aluminum in O_2 shielding are independent of welding speed, but grow with the increase in laser beam power. (3) The melting efficiency of aluminum welding in O_2 shielding by carbon dioxide gas laser beam with enough high power density attains the theoretical value calculated from a a wedge type volume heat source model, as well as, by an electron beam.
公益社団法人精密工学会の論文
1998-03-05