Internal Strain Distribution of Laser Lap Joints in Steel under Loading Studied by High-Energy Synchrotron Radiation X-rays

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.

Laser Peening Analysis of Aluminum 5083: A Finite Element Study

“…Laser technology has been used excessively utilized in material processing and manufacturing techniques such as forming [1], peening [2], additive manufacturing [3], cladding [4], and welding [5]. Among them, laser peening (LP) is an innovative postprocessing technique used in the industry to mitigate surface-related failures such as corrosion, fatigue, fretting fatigue, corrosion-fatigue, etc.…”