A method and device for end thickening of thin-walled seamless pipes

Abstract

The invention discloses a method and device for thickening the end of a thin-walled seamless pipe. The device comprises a pipe end heating device, a loading device, a thin-walled pipe clamping and fixing device and a control system. According to the method and device for thickening the end of the thin-walled seamless pipe, pressure welding and brazing are combined, thickening of the end of the thin-walled seamless steel pipe is achieved through welding, the technical defect of unstability occurring when thickening is achieved with the hot upset-extruding technology is overcome, and then a flat and smooth combining surface is realized; deformation of the position where the thin-walled seamless pipe and a connector are connected is small, combining strength is high, and the device is reasonable in structural design, simple in operation, and high in reliability and practicability.

Description

technical field [0001] The invention relates to the technical field of seamless steel pipe connection technology, in particular to a method and device for thickening the pipe wall at the end of a thin-walled seamless pipe. Background technique [0002] Seamless steel pipes have a hollow cross-section and are widely used as pipes for transporting fluids, such as pipes for transporting oil, natural gas, gas, water, and certain solid materials. Compared with solid steel such as round steel, the steel pipe is lighter in weight when the bending and torsional strength is the same. It is an economical section steel and is widely used in the manufacture of structural parts and mechanical parts. When the seamless steel pipe is connected at the end, flange connection can be used, or the end of the steel pipe can be upset first to make the end pipe wall thicker, or the wall thickness can be increased by surfacing welding at the end of the steel pipe, and then to connect. Since the fl...

AI Technical Summary

Problems solved by technology

[0005] The present invention provides a method and device for thickening the pipe wall at the end of a thin-walled seamless pipe, which integrates related technologies such as pressure welding and brazing, and can realize that the thin-walled seamless pipe can bear a relatively large load, and The pipe wall will not be distorted or deformed, effectively increasing the wall thickness, and can achieve high service strength, which solves the problem that the traditional thermal piercing method easily leads to the wrinkling and distortion of the thin-walled pipe wall

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