Abstract
The paper deals with a problem of laser welding of zinc-coated steel (DX53D+Z and DX54D+Z) plates. Experiments were carried out with the use of steel plates 0.8; 1.0; 1.3; and 1.75 mm thick. High power 2.5-2.9 kW CO2 laser was employed. CO2 was used as the shielded gas. The optimal parameters of welding for material under study were determined. The mechanical properties of welded joints were measured through the tensile loading and microhardness measurement. Tensile performances of the specimens fabricated at different welding rate and laser beam power were compared with that of the base material.
Highlights
The paper deals with a problem of laser welding of zinc-coated steel (DX53D+Z and DX54D+Z) plates
Combined tailored welded blanks (TWB) consist of two or more joined pieces and they can represent a combination of materials of different thickness and grades
The output and the laser welding rate were taken as fundamental parameters affecting the quality of the welds
Summary
Combined tailored welded blanks (TWB) consist of two or more joined pieces and they can represent a combination of materials of different thickness and grades. During laser welding of galvanized steel sheets, a high-pressure evaporation region (66–1060 atm) arises around the melt with a temperature of 1600–3000 °C [5,6,7]. The parts of the paper deals with the study of Zn surface layer behaviour of the combined tailored blanks during the welding process. To this end, the microhardness of welds was measured. The possibility of the formation of martensite phase is shown and discussed
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