METHOD FOR OBTAINING A COMPOUND OF STEEL WITH A TITANIUM ALLOY BY DIRECT LASER BUILD-UP Russian patent published in 2022 - IPC B23K26/20 B23K26/32 

FIELD: metal processing.

SUBSTANCE: invention relates to a method for joining steel with a titanium alloy by direct laser cultivation and can be used in the manufacture of space, energy and chemical engineering products, as well as in the manufacture of hull saturation products in shipbuilding. The powder material is fed into the surfacing zone by an argon stream. Surfacing is performed by a continuous laser beam in an argon medium. The compound is obtained by applying at least five layers of a mixture of spherical powders of molybdenum and copper-aluminum bronze to a titanium alloy substrate in a ratio of 60% and 40%, respectively, and then applying layers of spherical stainless steel powder to this layer. Molybdenum powder has a dispersity from 40 microns to 100 microns, copper-aluminum bronze and stainless steel powders have a dispersity from 50 microns to 150 microns. Powders are fed into the surfacing zone by a laser beam with an argon flow with a flow rate of 5 l/ min, while the surfacing zone is protected by argon supplied with a flow rate of 20 l/min. The layers are applied with a laser beam focused on the surface of the substrate or the previous layer into a spot with a diameter of 2 mm to 3 mm, at a speed of 1.5 m/min with a change in laser power from 1.6 kW to 1.8 kW. The pitch of the vertical displacement of the layers is set to 0.6 mm, the pitch of the transverse displacement of the layers is 1.3 mm, the mass flow rate of the supplied powder for each type of powders used is from 3 g/min to 5 g/min. The layer is formed by successive application of rollers one after another with their partial overlap in cross-section.

EFFECT: method provides a reliable equal-strength connection of steel and titanium alloy in the manufacture of blanks that do not require additional processing, additional consumables for processing and extra time.

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