RESEARCH ON THE JOINING OF GALVANIZED PROFILES OF LIGHT STEEL STRUCTURES USING THE MIG-BRAZING METHOD
DOI:
https://doi.org/10.31471/1993-9965-2025-1(58)-11-18Keywords:
light steel structures; LGSS; MIG brazing; thermal deformation cycle; strength; stiffness.Abstract
In modern construction, light-gauge cold-formed steel structures (LGSS) are becoming increasingly popular due to their efficiency, low weight, and fast assembly. LGSS profiles are made of carbon steel with a protective zinc coating, which ensures reliable corrosion resistance. One of the key technological challenges in constructing LGSS structures is to ensure reliable joints without compromising the protective zinc layer. This paper examines the technology of arc brazing (MIG brazing) as an effective alternative for joining galvanized elements, offering reduced thermal impact and preserving the integrity of the protective coating. Particular attention is given to the analysis of traditional joining methods (bolted, riveted), as well as arc welding and their disadvantages. Traditional joints are costly, while arc welding causes zinc burn-off due to high temperatures, thus reducing the corrosion resistance of the joints. Experimental studies compared the thermal processes involved in MAG welding and MIG brazing. It was found that the peak temperature in the weld zone during MAG welding reaches 760°C, while during MIG brazing it is only 240°C. This results in a temperature reduction of 520°C, significantly lowering the risk of zinc coating degradation and corrosion-prone areas. It was also revealed that reduced thermal deformation improves the dimensional accuracy of the structures, which is a critical factor in LGSS design. Tensile tests demonstrated that the strength of brazed joints is equivalent to or exceeds the strength of the base metal, as fractures occurred in the base material rather than in the joint area. The study concludes that arc brazing technology provides sufficient joint strength, high corrosion resistance of the welds, and preservation of the protective coating in the weld vicinity. These findings confirm the reliability of MIG brazing, and the results can be used in the development of joining technologies for LGSS.
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