METHOD OF FRICTION WELDING WITH MIXING OF ALUMINIUM ALLOYS Russian patent published in 2017 - IPC B23K20/12 B23K103/10 

FIELD: technological processes.

SUBSTANCE: invention can be used for making butt joints of details made of aluminium heat-resistant alloys of thickness 2…6 mm. A welding tool with a pin is used made in the form of a flattened cone with a length of 1.8…5.7 mm with three "left" thread grooves, and a supporting ledge with a diameter of 8…18 mm with a spiral groove. The tool is immersed into the joint of the connected details with a minimum speed of the vertical displacement 7…12 mm/min and high rotation velocity 350…500 rpm until a predetermined depth of 90…95% of the thickness of the welded details is achieved. The angle of the tool is changed relative to the vertical axis from 0 to -1.5…-2.5°. Then, keeping the angle and rotation velocity, the tool is moved along the joint line at a speed of 220…300 mm/min at a constant axial force of 12…15 kN, controlled by feedback sensors.

EFFECT: tool runout is prevented, internal defects are eliminated and the strength of the welded joint is ensured.

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