METHOD OF FRICTION WELDING WITH MIXING OF JOINTS OF ALUMINIUM ALLOYS Russian patent published in 2019 - IPC B23K20/12 B23K103/10 

FIELD: metallurgy.

SUBSTANCE: invention can be used for jointing parts from aluminium alloys having low weldability. Rotating tool consisting of a tip in the form of a body of revolution and a collar is immersed in the joint of the welded parts until the collar contacts their surface and is maintained. Movement of the tool along the butt is switched on so that the tool movement speed along the joint is maintained within range of 0.08–0.48 mm/rev. Directly behind the tool there performed is forced cooling of the seam and the zone of thermal influence at a rate of not less than 0.5 °C/s. Cooling is performed by supplying jet of cooling liquid or its mixture with air from sprayer directly behind tool or by immersion of welded parts and working tool into bath with circulating cooling liquid. When welding with Bobbin tool, seam cooling and heat-affected zones are performed simultaneously with face and reverse side of connection.

EFFECT: method provides higher strength of welded joints of cold-work and thermally hardened aluminium alloys.

4 cl, 6 dwg, 4 tbl