FIELD: metallurgy.
SUBSTANCE: before welding, the contacting surfaces of sheets to be joined are treated with laser cleaning. Then the sheets are tightly pressed. The welded seam is formed by periodic repetition of basic elements of V-, U-, Ω-shaped geometric form, in particular ellipses or circles, laser beam at constant speed at 90° relative to connection in two stages: heating of steel surface with defocused beam to temperature of 600°÷700° and melting of steel sheet with focused beam with protection of melt with gas mixture of argon and helium. For different ratios of thicknesses of sheets to be joined, the steel melt provides melting of aluminium sheet by 2/3÷7/8 of thickness.
EFFECT: simplification of welding technology, possibility to perform selection of rational geometric shape of the welded seam, improvement of welded joint quality and reduction of production rejects.
4 dwg, 3 ex, 3 tbl
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