The pole by the modulation output YAG laser it is thin metal flexible pipe production manner and device

摘要

PURPOSE:To eliminate welding defect of melt-down and humping by welding an extremely thin metal pipe with YAG laser beam generating a modulated output superimposing pulse laser beam output to continuous laser beam output. CONSTITUTION:The extremely thin metal foil 1 is continuously formed to pipe- state and the faced butting end faces 2 are converged to wedge-shape and center of the laser beam is made to coincide with the point, which gap 3a, 3b at near the converged point 4 becomes 1-5 times the foil thickness, and irradiated to melt the range of 2-10 times the foil thickness from edge part and the molten end face is pushed just before solidifying and welded. By using the modulated output superimposing the pulse laser beam output to the continuous laser beam output, at the time of non-molten condition on surface of the metal foil 1, the high energy at the pulse part in a ripple output is radiated to instantaneously come to the molten condition. Successively, the output is lowered to the continuous output part to prevent over-melting. The welding is executed to the extremely thin pipe without developing welding defect.