Method and device for connecting metal pipe based on laser shock wave technology

Abstract

The invention discloses a method and device for connecting a metal pipe based on a laser shock wave technology and belongs to the technical field of laser processing. In the invention, a black paint applied to the upper end part of a plugging rod serves as a laser energy absorption layer, and water serves as a restraint layer; a laser pulse beam subjected to parameter optimization enters the interior of a pipe fitting along the axis of the pipe fitting, so as to be irradiated on the absorption layer at the upper end part of the plugging rod through a light guide system; the absorption layer absorbs the energy of the laser so as to be gasified and ionized, thus forming high-voltage plasmas; and the high-voltage plasmas quickly dilate to form a high-amplitude shock wave, thereby promoting the quick dilatational strain of an inner pipe and causing the inner pipe to violently collide with an outer pipe, therefore the parts, which are impacted by the laser shock wave, of the two pipe fittings are plastically deformed obviously; and intensive thermal effect is produced during the collision process so that the interfaces of the collision parts of the two pipes are adhesively jointed together. The method and device provided by the invention are wide in application range, and capable of connecting metal pipe fittings different from each other in melting point, in coefficient of thermal dilation, in thermal treatment condition and in state.

Description

technical field [0001] The invention relates to the field of laser processing metals, in particular to a method and device for connecting metal pipes based on laser shock wave technology. Background technique [0002] Metal pipes are widely used as functional components. In order to meet their length requirements or spatial location requirements, the entire pipeline often needs to be connected by multiple pipe fittings. Commonly used connection methods for pipe fittings include welding and threaded connections. [0003] Welding connection is a common processing method at present. It is a processing method that connects pipe fittings of different sections at the joints by using welding materials such as welding rods under high temperature or high pressure conditions. The processing method of welded connection has the advantages of simple equipment and high production efficiency. However, there are weld seams and large heat-affected zones in welded pipe fittings. The existence...

AI Technical Summary

Problems solved by technology

However, explosive explosion welding pipe joints must be carried out in the field, the working conditions are poor, it is difficult to achieve precise control, and the processing safety is poor

Images