A method for optimizing the heating of welded pipe induction welding

Abstract

The invention discloses a method for optimizing weld pipe induction welding and heating, and belongs to the technical field of induction heating. The method comprises the following steps that 1, the wall thickness and diameter of a pipe blank are determined; 2, the induction welding and heating process of the pipe blank with an opening angle is simulated, and a welding heat source at a welding V-shaped angle is obtained; 3, trimming parameters of the edge of the pipe blank are determined according to a heating temperature cloud diagram; 4, the trimming parameters of the edge of the pipe blankare optimized; and 5, segmented trimming is carried out on the edge of the pipe blank, and according to the trimming parameters of the edge of the trimmed pipe blank, a heating source evenly distributed in the wall thickness direction is obtained. The induction welding and heating process of the pipe blank is simulated through a numerical simulation method, the shape of the edge of the pipe blankis controlled, high-frequency weld pipe induction welding and uniform heating are achieved, the heating efficiency is improved, and the volume of burrs is reduced.

Description

technical field [0001] The invention relates to a method for optimizing induction welding heating of welded pipes, belonging to the technical field of induction heating. Background technique [0002] Petroleum is the blood of industry, and oil pipes are the foundation of the oil industry. With the vigorous development of oil and gas projects, the production of high-reliability deep-sea oil pipes has important strategic significance. Due to its high-efficiency, energy-saving, green and low-cost production characteristics, high-frequency welded pipes occupy an important position in the field of welded pipes in my country. The quality of the high-frequency welded pipe depends on the treatment of the weld. Due to the proximity effect and the ring effect, the high-frequency welded pipe welded seam welded pipe is easy to form an hourglass-shaped heat source after high-frequency welding, and the large temperature gradient in the radial direction of the welded pipe often leads to hi...

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Problems solved by technology

[0003] In order to obtain a uniformly distributed welding heat source during the welding process of welded pipes, the Chinese patent CN201910238220.0ERW pipe billet lateral load application device and its lateral load application method can simultaneously adjust the position of the electrode block in the vertical direction to ensure the vertical direction of the positive and negative electrodes The location is consistent, which can solve the weld quality defects caused by the uneven temperature distribution caused by the inconsistent heating on both sides of the weld. The Chinese patent CN201610257206.1 is an experimental device for flexible closed-loop control of the weld opening angle of ERW pipes, which can pass Change the axial distance between every two pairs of small rolls and the radial distance between each pair of small rolls to change the reduction amount of each pair of small rolls, so as to obtain opening angles of different sizes and shapes. At the same time, use CCD cameras, computers The closed-loop system composed of pressure sensors can ensure the accuracy of the size and shape of the opening angle, thereby adjusting the shape of the welding heat source and improving the quality of the welded pipe. However, it can only be adjusted by continuously changing the shape of the opening angle by pressing, and cannot directly give the tube blank The specific shape of the edge causes uneven heating during the welding process of the welded pipe, and there is a burr volume on the welded pipe

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