SUCCESS/FAILURE DETERMINATION METHOD OF LASER WELDING

• Main Authors: KOBAYASHI HIROOMI, MATSUOKA NOZOMI
• Format: Patent
• Language: English; Japanese
• Published: 19.07.2018
• Subjects: BASIC ELECTRIC ELEMENTS; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; ELECTRICITY; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSIONOF CHEMICAL INTO ELECTRICAL ENERGY; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a success/failure determination method of laser welding when such a molten pool as to reach the back side of a weld zone is not formed upon the laser welding of an electrode body and a current collector.SOLUTION: A success/failure determination method of forming beads 4 on a contact region 5 by applying a laser beam L such that an irradiation position of the laser beam L is moved in a predetermined direction while drawing a circle C on the contact region 5 between an electrode body 1 and a current collector 2 and welding the electrode body 1 and the current collector 2 includes following steps: a step (1) of acquiring intensity data regarding intensity of return beam from the irradiation position at every circle C drawn by the irradiation position; a step (2) of calculating an average value of the intensity data at every circle C drawn by the irradiation position; a step (3) of determining whether an average value becomes a predetermined range and measuring the number of times of defection as the number of timed when the average value becomes without the predetermined range; and a step (4) of determining that laser welding is defective when the proportion of the number of times of defection with respect to the sum of circles C required for forming the beads 4 exceeds a predetermined value.SELECTED DRAWING: Figure 1 【課題】電極体と集電体をレーザ溶接するに際し、溶接部裏側に至るような溶融池を形成しない場合におけるレーザ溶接の成否判定方法を提供する。【解決手段】電極体１と集電体２との接触領域５にレーザ光Ｌをレーザ光Ｌの照射位置が円Ｃを描きながら所定方向に移動するように照射することで接触領域５にビード４を形成して電極体１と集電体２とを溶接する成否判定方法は以下のステップを含む。（１）照射位置が描く円Ｃ毎に照射位置からの戻り光の強度に関する強度データを取得するステップ。（２）照射位置が描く円Ｃ毎に強度データの平均値を算出するステップ。（３）平均値が所定範囲内か判定し、平均値が所定範囲外となった回数としての不良回数を計数するステップ。（４）ビード４を形成するのに必要となる円Ｃの総数に対する、不良回数の割合が所定値を超えたら、レーザ溶接は不良であると判定するステップ。【選択図】図１