Open AccessEvidence of solidification crack propagation in pulsed laser welding of aluminum alloy
Author(s) -
Zhiyuan Jia,
Peilei Zhang,
Yu Zhang,
Di Wu,
Yingtao Tian,
Hua Yan
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.422369
Subject(s) - welding , materials science , residual stress , laser beam welding , high speed photography , acoustic emission , fracture mechanics , laser , heat affected zone , interference (communication) , optics , metallurgy , composite material , electrical engineering , physics , channel (broadcasting) , engineering
It is difficult to collect the crack propagation signal under general continuous welding condition due to other signal interference of molten pool. In order to study the effect of residual stress on crack propagation, acoustic emission technology was successfully applied to monitor welding process according to the characteristics of pulsed laser welding. Crack free welding is achieved by reducing the pulse interval to limited the crack size of single pulse welding spot. The welding process was monitored synchronously by high speed photography and acoustic emission, the evidence of crack propagation after solidification of weld is successfully captured.