Thick-walled pipe lateral induction straight seam welding device and method

Abstract

The invention discloses a lateral induction straight seam welding device for thick-walled pipes, which includes a pressure roller, a numerical control console, a support frame, an end cover, a hydraulic cylinder, a local induction heating device, an infrared thermometer, a disc induction coil, Frame, hydraulic jacking device, hydraulic telescopic arm, support shaft, edge heating module, and coupling block; the invention provides a lateral induction straight seam welding method for thick-walled pipes. The upper and lower sides of the wall pipe welding gap are preheated and the axial expansion and contraction of the hydraulic cylinder is controlled to control the position of the local induction coil, and the low temperature part of the weld side wall is supplemented with heat; the invention effectively controls the heating range and High efficiency, the coil equipped with a magnetic conductor is used to supplement the heat of the low-temperature part, which solves the uneven temperature of the welding surface caused by the boundary effect, and can greatly reduce welding defects such as cold welding, cracking, and edge waves.

Description

Technical field [0001] The present invention belongs to the field of inductive welded tubes, and more particularly to a thick-wall tube lateral inductive straight seam welding device and method thereof. Background technique [0002] With the continued consumption of world energy, all countries in the world have gradually developed deep-sea oil and gas, and as the seabed depth of oil and gas exploitation is gradually increased, the water pressure of the seabed energy delivery pipe is also increasing, and the deep sea oil and gas pipeline The wall thickness is one of the important technical indicators carrying deep sea water pressure. The production and manufacture of thick-wall tubes will become the technical point of need to overcome it; the production process of pipe manufacturing for pipeline transported by deep sea is currently used. With the high-speed development of the induction heating in the last century, the technique of using the induction heating to welding is graduall...

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Problems solved by technology

[0002] With the continuous consumption of energy in the world, countries all over the world have begun to gradually develop deep-sea oil and gas. As the depth of the seabed for oil and gas extraction and transportation gradually increases, the water pressure that submarine energy transmission pipelines need to withstand is also increasing. Deep-sea oil and gas pipelines Wall thickness is one of the important technical indicators for carrying deep sea water pressure, and the production and manufacture of thick-walled pipes has become an urgent technical point to be overcome; currently, the production process of straight welds is rarely used in the manufacture of pipes used for deep-sea oil and gas transportation. With the rapid development of induction heating in the last century, the technology of applying induction heating to welding has gradually matured. Among them, high-frequency induction welded pipes have been adopted by the manufacturing industry because of their fast welding speed, small welding heat-affected zone, and weldable thin-walled pipes. Widely used; however, due to the proximity effect and boundary effect of electromagnetic induction heating, when high-frequency welded pipes are welded to thick-walled pipes, the eddy currents on the side wall of the weld will always concentrate on the inner and outer sides of the tube billet, resulting in the inner and outer sides of the weld The temperature is high and the temperature of the middle layer of the weld is low, resulting in welding defects such as cold welding, seam opening, and edge waves; for high-frequency welded pipes, the main heating method currently used is to increase and concentrate the magnetic field of the weld seam with an inductor and an impedance , so as to conduct induction heating on the straight weld of the welded pipe; but because the phenomenon of uneven temperature distribution on the side wall of the weld has not been solved, it is impossible to carry out straight seam welding on the thick-walled pipe, which also makes induction heating in the thick-walled pipe It has not been widely used in straight seam welding

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