Researchers improve mechanical properties of aluminum/steel joints

Material and design (2022). DOI: 10.1016 / j.matdes.2022.111022″ width=”800″ height=”425″/>

Graphic abstract. attributed to him: Material and design (2022). DOI: 10.1016 / j.matdes.2022.111022

Researchers from the Shanghai Institute of Optics and Micromechanics (SIOM) of the Chinese Academy of Sciences (CAS) conducted an experimental research on the technology for non-dissimilar metal laser spot welding of aluminum/steel, and made improvements in the mechanical properties of aluminum/steel weld joints. The study was published in Material and design.

To improve the bad performance of AluminiumFor metal/dissimilar welds to steel, the researchers used a resistance laser spot welding technique for group welding. The spot welds are made by the resistance spot welding connection technology, which is the dominant technology in automobile manufacturing, and the circular welds around the spot welds are made by the laser plane welding technology.

Researchers have found significant improvements in the mechanical properties of aluminium/steel joints It was achieved by changing the structure of the joint and controlling the thickness of brittle metal compounds. Resistance spot welding had a significant tensile and shear load but poor ductility and energy absorption due to the presence of a weak bonding area around the perimeter of the joint, which facilitated notch initiation and rapid propagation. The following laser spot welding was performed in the weak bonding region of the resistive spot welding joint, which prevented the rapid propagation of cracks along the wear interface to avoid interface fracture.

Aluminum/steel dissimilar metal welding technology has broad application prospects in the context of automotive lightweight. However, due to the huge difference in thermophysical properties between aluminum/steel, a large amount of brittle metal compounds and cracks are formed in the weld after welding, resulting in a situation where aluminum/steel joints cannot meet the requirements of the body application.

To date, many published works focus mainly on the improvement of welding parameters and the design of alloying elements in welds, with the aim of reducing the formation of brittle metal compounds in welding and improving the mechanical properties of the joint. This work provides a new technical solution for aluminum/Solid dissimilar metal welding.

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more information:
Mingfeng Li et al, Hybrid laser resistive spot welding of aluminum with dissimilar materials to steel: microstructure and mechanical properties, Material and design (2022). DOI: 10.1016 / j.matdes.2022.111022

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