Gamma-TiAl intermetallic compound laser welding device and method with preheating device

Abstract

The invention discloses a gamma-TiAl intermetallic compound laser welding device and method with a preheating device. The device comprises the preheating device, a powder feeding device, a laser device, a gas protection device and a welding clamp, wherein the preheating device is a heating table capable of achieving temperature control, the powder feeding device consists of an argon bottle, a scraper type powder feeder and a coaxial powder feeding head, and the argon bottle, the scraper type powder feeder and the coaxial powder feeding head are sequentially connected with one another; the welding clamp comprises a fixed support, a threaded rod and a gasket, the fixed support is clamped on the heating table, the threaded rod penetrates through the fixed support, the lower end of the threaded rod is connected with the gasket, and a to-be-welded sample is placed between the gasket and the table top of the heating table; a closed hood is arranged above the heating table, the coaxial powderfeeding head is located above a welded joint of the to-be-welded sample, and the gas protection device is used for feeding inert gas into the closed hood. According to the device, the brittleness ofa gamma-TiAl intermetallic compound can be reduced in the laser welding process of the gamma-TiAl intermetallic compound, the possibility of crack initiation in the welded joint is reduced, and then the mechanical property of the welded joint is improved.

Description

technical field [0001] The invention relates to a γ-TiAl intermetallic compound laser welding device and method with a preheating device, belonging to the technical field of laser welding. Background technique [0002] γ-TiAl intermetallic compounds have become the most potential structural materials in heat-resistant structural parts of aviation and aerospace engines due to their excellent properties such as low density, high specific strength and specific modulus, high temperature oxidation resistance and creep resistance. The application of aeroengine blades is a hot spot in the field of titanium alloy research. [0003] In the process of using γ-TiAl intermetallic compounds to produce structural parts, the welding process of materials will be involved. Due to the room temperature brittleness of γ-TiAl intermetallic compounds, it is easy to initiate cracks in the weld during the welding process, which in turn affects the mechanical properties of the welded joint. At pre...

AI Technical Summary

Problems solved by technology

Due to the room temperature brittleness of the γ-TiAl intermetallic compound, it is easy to initiate cracks in the weld during the welding process, which in turn affects the mechanical properties of the welded joint

At present, the methods of welding γ-TiAl intermetallic compounds are mainly diffusion welding and brazing, and there are few studies on laser welding of γ-TiAl intermetallic compounds.

Images