Welding pipe medium-frequency induction heating heat source optimization method

Abstract

The invention relates to a welding pipe medium-frequency induction heating heat source optimization method. A heating method comprises the steps that the axial distance between an inner coil and an outer coil and the motion speed of a pipe blank are obtained; the total heating time is determined according to the axial distance and the motion speed; the outer axial path and the inner axial path areobtained; an outer array of the outer axial path and an inner array of the inner axial path are extracted; the width of a heat source coincidence line is determined according to the inner temperatureand the outer temperature; the width of a welding line fusion line is obtained; and when the heating temperature is too high, the smallest heating area in the moving process is determined according to the width of the welding line fusion line and the width of the heat source coincidence line; and according to the smallest heating area, the pipe blank is heated through corresponding technology parameters, and a welding pipe is prepared. By adoption of a heating device and method, the welding residual stress of the welding pipe welding line area can be reduced, the overburning area in the welding pipe heat treatment process is reduced, and the heating efficiency is improved.

Description

technical field [0001] The invention relates to the field of induction heating, in particular to a heat source optimization method for medium-frequency induction heating of welded pipes. Background technique [0002] my country currently has a production capacity of 70 million tons of welded pipes, and is a veritable country of welded pipes. Among them, high-frequency welded pipes have developed rapidly due to their high-efficiency, energy-saving and low-cost production characteristics, and occupy an important position in the field of welded pipes in my country. However, due to a late start, Compared with the advanced production technology and research and development capabilities of developed countries, there is still a big gap, and the production of high-end high-frequency welded pipes is still restricted. The key to the quality control of welded pipes lies in the weld seam treatment. The matching of heat source and parameters is one of the key points of the industry. In o...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a heat source optimization method for intermediate frequency induction heating of welded pipes, which automatically matches the axial distance between the inner and outer coils, optimizes the heat source for intermediate frequency heating, and solves the problem of overburning of the outer wall of the intermediate frequency heating of the welded pipe and the inner wall of the intermediate frequency heating existing in the existing intermediate frequency heating technology. The problem of impervious heating leads to low quality of welded pipe preparation

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