Friction welding process of copper pipe and aluminum pipe

Abstract

The invention discloses a friction welding process of a copper pipe and an aluminum pipe, and relates to the field of welding. The friction welding process comprises the following steps: a, blanking a copper pipe blank and an aluminum pipe blank; b, carrying out cutting machining on the welding end surfaces of the copper pipe blank and the aluminum pipe blank; c, mounting the aluminum pipe blank into a moving clamp, and mounting the copper pipe blank into a rotating clamp; d, starting the rotating clamp to drive the copper pipe blank to rotate, driving the moving clamp to drive the aluminum pipe blank to move towards the direction of the rotating clamp, and enabling the welding end surfaces of the copper pipe blank and the aluminum pipe blank to frictionize each other; e, when the friction time reaches 1.9 to 2.5 seconds, stopping the rotating clamp immediately to enable the copper pipe blank to stop rotating immediately; and f, controlling the moving clamp to pre-forge a welding joint. The process is simple; friction welding of the copper pipe and the aluminum pipe can be realized, so that the welding strength and the service life can meet the ruled requirements; the sealing property is high, and the conductivity is higher than that of aluminum; and furthermore, batch and efficient production can be realized.

Description

technical field [0001] The invention relates to the field of welding, in particular to a friction welding process for copper pipes and aluminum pipes. Background technique [0002] The dissimilar metal connection structure has the excellent performance of the combination of the two materials, and has been widely used in the fields of national defense and national production, and its application prospects continue to expand. For example, copper has excellent electrical and thermal conductivity, but because copper is relatively expensive, it brings huge cost pressure to related companies in the field of electrical engineering. Aluminum and its aluminum alloys also have excellent physical and mechanical properties. [0003] In order to save production costs, aluminum or copper-aluminum welded parts are used to replace copper for some electrical products or components, which has become a trend in the development of the electrical and electric power industries. However, since t...

AI Technical Summary

Problems solved by technology

However, since the melting points of the two materials differ by nearly 400°C, the mutual solubility is very limited. In the conventional fusion welding process, the mass fraction of Cu in the joint is generally about 30%, which inevitably produces brittle intermetallic compounds of aluminum and copper, which seriously affects the joint strength

Therefore, it is not easy to use the traditional fusion welding method for welding