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Relationship Between Overlap Rate of Weld Spots and Solidification Characteristic for Pulsed Laser Welding
Author(s): 
Pages: 13-17,18
Year: Issue:  4
Journal: Heat Treatment

Keyword:  lasersolid pulsed laserpulse frequencyspot overlap ratewelding seamsolidification characteristic line;
Abstract: 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.
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