Flash welding forming method of alpha-beta two-phase titanium alloy thin-wall ring piece

Abstract

The invention discloses a flash welding forming method of an alpha-beta two-phase titanium alloy thin-wall ring piece. The method includes the steps that a D-shaped ring blank with an opening is filled in a welding machine, the welding machine is started to close the opening of the ring blank, and 7V-18V voltage is applied between two poles of the welding machine so that a left end surface and a right end surface at the position of the opening of the ring blank is heated and melt through flash current with density of 20A / mm<2>-180A / mm<2> to form a lintel and then blasted to form a flash; the burning loss speed of the flash of the ring blank is 3.0mm / s-6.0mm / s, and the right end surface of the ring blank is driven to perform accelerating feed movement toward the left end surface with the initial speed of 2.0mm / s-3.0mm / s and the accelerated speed of 0.5mm / s<2>-1.0mm / s<2> so that the distance between the left end surface and the right end surface is smaller than 10mm; and after the flash is finished, a right side straight edge of the ring blank is driven to perform high speed movement toward a left side straight edge, the left end surface and the right end surface are hit against each other under the action of upsetting forces of 10kN-15kN to form the flash welding thin-wall ring piece, and pressure maintaining is performed for 20s-30s under the action of the upsetting forces. According to the method, flashing process can be continuously performed to improve welding quality.

Description

technical field [0001] The invention relates to a welding method, in particular to a flash welding forming method of an α-β two-phase titanium alloy thin-walled ring. Background technique [0002] With the increasing demand for rings in industries such as aviation, aerospace, ships, gas turbines, wind energy, nuclear energy, and bearings, rings formed by traditional rolling methods not only waste a lot of materials due to large machining allowances and low material utilization , but also keeps the cost of ring parts high. The ring parts produced by the flash welding process have less machining allowance, high material utilization rate, and greatly reduce the cost, which is conducive to the development of ring forming technology in the direction of precision forming technology. [0003] The Chinese invention patent specification CN 1233548A published on November 3, 1999 discloses a flash welding process for aluminum alloy wheels of automobiles and motorcycles. The technologi...

AI Technical Summary

Problems solved by technology

However, in the process of welding thin-walled rings such as α-β two-phase titanium alloy thin-walled rings by flash welding, if the distance between the two ends of the ring blank weld is not well controlled, the flash will stop, which will affect the welding. The performance and quality of the weld seam, in severe cases, the weldment will be scrapped

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