Inner hole welding protection tool and inner hole welding method

Abstract

The invention discloses an inner hole welding protection tool and an inner hole welding method, and relates to the field of inner hole welding of a pipe-shell type heat exchanger pipe joint, in particular to the inner hole welding protection tool and the inner hole welding method. The inner hole welding protection tool comprises an upper clamp body and a lower clamp body, wherein the upper clamp body and the lower clamp body are connected to form a hollow cylindrical clamp body; the upper clamp body and the lower clamp body are connected through a sealing structure; the outer peripheral surface of the lower clamp body is fixedly connected with a fixing base; the upper clamp body is connected with a pressing rod; and the end, away from the upper clamp body, of the pressing rod is connectedwith a sleeve. The tool is reliable to use. By using the inner hole welding protection tool on the surface of a weld joint, the situations that the pipe joint is not completely welded and the outer surface of the weld joint is oxidized can be avoided. During welding, high-purity argon or other protective gases are introduced into the inner hole welding protection tool, and a protective gas atmosphere is formed outside the weld joint through a channel formed by the upper clamp body and the lower clamp body, so that the surface of the weld joint is smooth. An operator only needs to conduct installation and gas introduction, and the operation safety and the practicability are high.

Description

technical field [0001] The invention relates to the field of inner hole welding of pipe joints of shell and tube heat exchangers, in particular to an inner hole welding protection tool and an inner hole welding method. Background technique [0002] In the fields of petroleum, chemical industry, food, medicine and nuclear industry, heat exchangers are widely used, with various types and structures, among which shell-and-tube heat exchangers are the most commonly used. There are two cavities in this heat exchanger, and the sealing of the two cavities is ensured mainly by the welded joint (pipe joint) between the heat exchange tube and the tube sheet. In the design and manufacturing process, the welding quality of the pipe joint directly affects the quality, safety and service life of the heat exchanger. The connection methods of the pipe joint generally include strength welding, strength expansion joint, strength welding + paste expansion, inner hole welding, etc. . [0003]...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the present invention provides a method to effectively solve the welding problem of the inner hole of the pipe joint of the shell-and-tube heat exchanger, as well as the incomplete penetration in the process, the poor protection of the pipe joint due to oxidation, the decline in intergranular corrosion resistance, An inner hole welding protection tool and inner hole welding method for problems such as excessive welding stress and crevice corrosion during use

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