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Hybrid laser-microplasma welding of stainless steel

Appearance of the head for laser-microplasma welding in hand robot KUKA KR30HA: 1 - integrated plasmatron; 2 - seam protection system; 3 - mouthpiece for feeding filler wire
Appearance of the head for laser-microplasma welding in hand robot KUKA KR30HA: 1 – integrated plasmatron; 2 – seam protection system; 3 – mouthpiece for feeding filler wire
Welded products from thin-sheet stainless steels are made by the modern industry for the purpose of application in the fields of engineering connected with need of operation of strong enough designs, subject to corrosion and certain mechanical influences. Examples of such fields of technology may be: manufacture of domestic structures for marine climate or high humidity, elements of hull structures of transport equipment (eg, railway car bodies), bellows expansion joints for nuclear energy, chemical and food industry equipment (eg, tanks, filters) and other.
At the same time the task of welding of stainless steels up to 3,0 mm thick butt is often set. One of the modern innovative methods of welding, which allows to minimize residual deformations, to obtain high-quality and durable joints, is a hybrid laser-microplasma welding. In the EEZ them. Є.О. The basic technological methods of hybrid laser-microplasma welding of thin-sheet stainless steels have been developed and the choice of mode parameters has been made, as well as the mechanical and corrosion properties of the obtained joints have been studied. Hybrid laser-microplasma welding of thin-sheet stainless steels without filler wire and with its application was performed. It was determined that the use of filler wire is advisable starting with a thickness of at least 1.0 mm. In this case, for complete melting of a wire with a diameter of 0.8 mm in the case of welding with tightly joined edges, the linear energy of the process must be increased by 20-40%, and in the case of welding with a gap between the edges by 15-30%. The size of the gap should be about 15-20% of the thickness of the edges. Determination of mechanical and anticorrosive properties obtained by hybrid laser-microplasma welding of stainless steel joints confirmed the prospects for industrial application of this method.

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