Large-pipe-diameter thin-wall pipe post-welded heat treatment device and using method thereof

Abstract

The invention discloses a large-pipe-diameter thin-wall pipe post-welded heat treatment device and a using method thereof, and belongs to the technical field of welding heat treatment. The device comprises steel pipe supporting seats (1), electric heating elements (2), insulating layers (3) on the electric heating elements (2), thermocouples (4), a binding material (5), an inner pipe wall heat preservation layer (6) and a supporting frame (7), wherein the electric heating elements (2) are basically equally and uniformly arranged along the outer circumference of a steel pipe (8), and each of the electric heating elements (2) and the corresponding thermocouple (4) are respectively connected with the corresponding heat treatment temperature control instrument. During use, the electric heatingelements (2) of the device is electrified and heated, so that an annular weld joint (9) of the steel pipe (8) and the nearby area are heated to the heat treatment temperature, cooling is carried outafter heat preservation, and then the post-welded heat treatment of the steel pipe is completed. By the adoption of the large-pipe-diameter thin-wall pipe post-welded heat treatment device and the using method thereof, a better welding heat treatment and heat preservation effect can be obtained, the heating temperature is controlled accurately, the heating temperature fluctuation is small, the heat treatment deformation can be reduced, and the performance uniformity after heat treatment can be improved.

Description

technical field [0001] The invention relates to the technical field of welding heat treatment, in particular to a post-weld heat treatment device for large-diameter thin-walled pipes and a method for using the same. Background technique [0002] Large-diameter thin-walled pipes are often used in gas pipelines such as gas pipelines. Gas pipelines are generally tens of kilometers or even longer. The circular seam welding of large-diameter thin-walled pipes is an essential manufacturing process. After welding of large-diameter thin-walled pipes, in order to avoid the hardened structure of the weld metal and the welding heat-affected zone, eliminate or reduce the welding residual stress, improve the plasticity and toughness of the welded joint, and promote the escape of residual hydrogen, it is often necessary to carry out post-weld welding. heat treatment. When local heat treatment is performed on the welded ring seam of large-diameter thin-walled pipes, due to the large diame...

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Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a large-diameter thin-walled pipe post-weld heat treatment device and heat treatment method, which solves the problems of fast heat dissipation, difficult temperature control, and uneven heating temperature in the post-weld heat treatment of large-diameter thin-walled pipes. , the problem of large heat treatment deformation and uneven performance after heat treatment

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