Abstract
The presented research background is a car body manufacturer’s request to test the car body’s components welded from dissimilar steel sheets. In view of the vehicle crew’s protection, it is necessary to study the static and dynamic behavior of welded steels. Therefore, the influence of laser welding on the mechanical and dynamical properties, microstructure, microhardness, and welded joint surface roughness of interstitial free CR180IF and dual-phase DP600 steels were investigated. Static tensile tests were carried out by using testing machine Zwick 1387, and dynamic test used rotary hammer machine RSO. Sheet steel was tested at different strain rates ranging from 10−3 to 103 s−1. The laser welds’ microstructure and microhardness were evaluated in the base metal, heat-affected zone, and fusion zone. The comprehensive analysis also included chemical analysis, fracture surface analysis, and roughness measurement. The research results showed that the strain rate had an influence on the mechanical properties of base materials and welded joints. The dynamic loading increases the yield stress more than the ultimate tensile strength for the monitored steels, while the most significant increase was recorded for the welded material.
Highlights
The automotive industry has a significant impact on people’s daily lives worldwide and affects their safety [1]
The microstructure of welded joint of CR180IF and DP600 steels is presented in Olympus Vanox AH2-AN45 osciloscope, and inset are detailed images from the scanning electron microscope JEOL JSM-6610LV
The experimental results indicate that the strain rate affects the mechanical properties and fracture surface of tested steels
Summary
The automotive industry has a significant impact on people’s daily lives worldwide and affects their safety [1]. Laser welding affects the static and dynamic properties of welded sheets, which influence passenger safety. Low-carbon steel sheets are frequently used materials in the automotive industry, as they can be pressed and joined into complex units at low production costs [6,7]. Research into laser-welded materials provides much valuable information, there are still problems and issues that need to be further analyzed and discussed. It concerns gathering information on less explored material pairs and examining the dynamic properties of joints, as steel manufacturers usually perform only a series of static tensile tests on welded joints before they are subjected to full-size crash tests [24]. The presented research aims to examine the static properties and the dynamic behavior of laser-welded CR180IF and DP600 steels
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