二方向照射による溶接変形量の低減 : レーザ溶接による自動車部品のミクロン・サブミクロンレベルにおける変形挙動に関する研究(第3報)

概要

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Laser welding systems have been installed in many assembly lines because of small welding distortions. Nonetheless, desires to produce earth-friendly automotive components such as fuel injectors with low volume of residual hydrocarbons in exhaust emissions require higher accuracy of microns or sub-microns order to maintain their function. For examples, circularity deviation of such an injector after welding is requested to be less than 1 micrometer. Laser welding is a processing with small distortion, however, making the distortion smaller is critical to meet such a high level objective. In this paper, we consider the deformation mechanism by using numerical analyses and experiments, and propose a new method, twin beams method, to decrease the deviation of circularity. Twin beams, which is separated by 90 degrees, obtain a smaller deviation of circularity because of canceling expansion and shrinkage during the welding process. This method is brought into production facilities.
社団法人溶接学会の論文
2005-02-05