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Registration Number

0225U002873, (0125U001370) , R & D reports

Title

Investigation of structure and corrosion resistance of zinc coated profiles weld joints, obtained by laser welding

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Дослідження макро-та мікроструктури зварних з’єднань оцинкованих профілів отриманих лазерним зварюванням в залежності від товщини металу, що зварюється Дослідження корозійної стійкості та можливість використання продукції, отриманої методом лазкрного зварювання, при мінімальній додатковій обробці зони зварювання

Head

Kukhar Volodymyr V., Доктор технічних наук

Registration Date

12-04-2025

Organization

Metinvest Polytechnic Technical University, Limited Liability Company

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to determine the features of structure and corrosion resistance of welded joints of zinc coated profiles obtained by laser welding and to justify the possibility of using this production technology with minimal additional costs for processing the joint area after welding

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 The object of study is the welds of galvanised steel bent profiles made by laser welding. These welds play a key role in ensuring the durability of structures operated in aggressive environments, particularly in construction and engineering. The aim of the study was to determine the structure and corrosion resistance of welded joints, as well as to substantiate the possibility of using laser welding without additional post-weld processing of the weld zone. To achieve this goal, a methodology for assessing corrosion resistance was developed and a set of studies of the structure and behaviour of welds in NaCl and HCl solutions was carried out. The research has shown that after 72 hours of exposure to 5% NaCl solution, the weld surface remains unchanged, indicating high resistance to moderate corrosion. In a 90% NaCl solution, localised damage to the coating was recorded, but without destruction of the weld metal. Under the conditions of 10% HCl, zinc was completely dissolved, but the corrosion intensity of the weld metal did not exceed that of the base metal. Microstructural analysis confirmed the formation of a uniform dendritic structure of the weld without significant grain growth. It was found that the high crystallisation rate during laser welding minimises the formation of non-metallic inclusions that can serve as corrosion sites. It was also confirmed that non-metallic inclusions in the base metal can affect the stability of the welding process. The scientific novelty lies in proving the high corrosion resistance of laser welds, which contradicts the common perception of the vulnerability of the joint zone. The relationship between microstructural homogeneity and corrosion resistance was established. The results of the work were handed over to DANVIS for practical use. The research is of practical importance for metallurgy, construction, welding and educational programmes in the areas of Materials Science and Mechanical Engineering.

Product Description

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Boiko Ihor O.
Pashynskyi Volodymyr V.

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2025-04-12