CAJ | 학술논문

采用SW-500型Nd：YAG固体脉冲激光器对厚度1．0 mm的 M170P汽车用薄钢板进行了焊接性试验。研究了脉冲激光工艺参数对焊缝表面脉冲激光焊点重叠率的影响，分析了焊缝的凝固特征。结果表明，焊缝表面脉冲激光焊点的重叠率主要受焊接速度和脉冲频率的影响，当脉冲激光焊点重叠率为70％左右时，焊缝具有良好的表面成形性。采用“适度熔透”模式形成的焊缝，其横向截面形状基本呈倒梯形，纵向截面的凝固特征线整体弯曲度较小，呈等距离分布；而采用“过度熔透”模式形成的焊缝，其横向截面形状呈双曲线形或梯形，纵向截面凝固特征线中间的弯曲度较大，类似鳞片状分布。
채용SW-500형Nd：YAG고체맥충격광기대후도1．0 mm적 M170P기차용박강판진행료한접성시험。연구료맥충격광공예삼수대한봉표면맥충격광한점중첩솔적영향，분석료한봉적응고특정。결과표명，한봉표면맥충격광한점적중첩솔주요수한접속도화맥충빈솔적영향，당맥충격광한점중첩솔위70％좌우시，한봉구유량호적표면성형성。채용“괄도용투”모식형성적한봉，기횡향절면형상기본정도제형，종향절면적응고특정선정체만곡도교소，정등거리분포；이채용“과도용투”모식형성적한봉，기횡향절면형상정쌍곡선형혹제형，종향절면응고특정선중간적만곡도교대，유사린편상분포。
A test for weldability of 1 mm thick M170P thin sheet for automobile was perforemed by SW-500 Nd:YAG solid pulsed laser.The effect of pulsed laser process parameters on overlap rate of pulsed laser weld spots at the welding seam surface was investigated.The solidification characteristics of the welding seam was analyzed.The results show that the overlap rate of the pulsed laser weld spots at the welding seam surface is mainly affected by the welding speed and pulse frequency,and that when the overlap rate of pulsed laser welding spots is large as about 70%,the welding seam offers good surface formability.Furthermore,the cross section of the welding seam developed by “moderate penetration”is approximate to an inverted trapezoid,and the solidification characteristic lines of the longitudinal section offer less crooked and equidistant distribution on the whole,whereas the cross section of the welding seam developed by“over-penetration”is a hyperbola-type or trapezoid,and the solidification characteristic lines of the longitudinal section is relatively crooked and approximate to squamous in the middle.