Abstract
The automotive industries employ laser beam welding because it realizes a high energy density without generating irradiation marks on the opposite side of the irradiated surface. Typical measurement techniques such as strain gauges and tube X-rays cannot assess the localized strain at a joint weld. Herein high-energy synchrotron radiation X-ray diffraction was used to study the internal strain distribution of laser lap joint PNC-FMS steels (2- and 5-mm thick) under loading at a high temperature. As the tensile load increased, the local tensile and compressive strains increased near the interface. These changes agreed well with the finite element analysis results. However, it is essential to complementarily utilize internal defect observations by X-ray transmission imaging because the results depend on the defects generated by laser processing.
Highlights
Laser processing technology realizes a higher energy density than other welding heat sources
Lap joint welds with two thin plates can be joined without generating irradiation marks on the opposite side of the laser irradiation surface
FINAS is a general-purpose nonlinear structural analysis system based on the finite element method, which was developed by Japan Atomic Energy Agency (JAEA)
Summary
Laser processing technology realizes a higher energy density than other welding heat sources. Lap joint welds with two thin plates can be joined without generating irradiation marks on the opposite side of the laser irradiation surface. It is difficult to estimate the internal stress/strain state from the surface measurement results under a load when the target is lap welded joints, especially since a laser should generate a stress gradient in the local region of the weldeTdrapdoirttiioonna.lAly,msetrthesosd museiansgunreemuteronntss cuasninrgeaslitzraeinnognaduegstersucatnivde mtuebaesuXr-ermayesntasrienspidereafomrmateedriatlo. AFidgudrietio4.nDaliflyfr,atchtieonstpraroinfilienscoref aαs-eFde2w11ituhntdheer laohaidg.h temperature and tensile load
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