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.