Abstract
The 22MnB5-galvannealed steel is extensively used in the hot stamping process to produce car anti-collision structure parts. Furthermore, the resistance spot welding (RSW) is an important process in the automobile industry, especially in body construction, and the 22MnB5-galvannealed steels are a big challenge for the joining methods because their microstructure and mechanical properties are different from those of the conventional steels. In view of this, the present paper aims to optimize the parameters of the RSW process of the 22MnB5-galvannealed steel. Initially, the goal was to remove the galvannealed coating and in the next stage, the following responses were maximized: the nugget width, the nugget cross-sectional area, the penetration, the strength, the joint efficiency, and the energy absorption, whereas the indentation, heat affected zone and separation were used as constraints. The process parameters selected were the effective welding time, the effective welding current, the quenching time, and the upslope time. Response surface methodology (RSM) was applied jointly with the global criterion method based on principal components. The results of the multiobjective optimization are close to the individual targets for each response, highlighting the importance of considering the correlation structure presented in the responses.
Highlights
The global automobile industry has faced many challenges in different areas, such as energy, gas emission, security and accessibility
Among the large number of materials developed for this purpose, the advanced high strength steels (AHSS) have become a promising alternative to reduce the weight without affecting the structure of the vehicle [2]
The metallic coating directly influences the quality of the resistance spot welding (RSW) process, its removal is extremely important
Summary
The global automobile industry has faced many challenges in different areas, such as energy, gas emission, security and accessibility. To maximize the reduction of the vehicle mass, materials with metallurgic properties, which enables the combination of resistance and lightness, should replace the conventionally used low-carbon steels [1]. According to [3], the 22MnB5-galvannealed steel stands out among the other AHSS It is largely used in hot stamping process because of its good aptitude for quenching, attaining a shear strength resistance around 1500 MPa [4,5,6]. It has a superficial layer consisting of iron and zinc (Fe-Zn), resistant to the oxidation, which protects the structural components when exposed to the environment [3]
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