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

Abstract

The invention discloses a thick-wall pipe lateral induction straight seam welding device. The thick-wall pipe lateral induction straight seam welding device comprises a pressing roller, a numerical control operation table, a supporting frame, an end cover, a hydraulic cylinder, a local induction heating device, an infrared temperature detector, a disc-shaped induction coil, a rack, a hydraulic jacking device, a hydraulic telescopic arm, a supporting shaft, an edge heating module and a coupling block. The thick-wall pipe lateral induction straight seam welding method is provided and comprises the following steps: preheating the upper side and the lower side of a thick-wall pipe welding gap through the induction coil connected with a magnetizer, controlling the axial extension and retraction of the hydraulic cylinder to control the position of a local induction coil, and supplementing heat for a low-temperature part of the side wall of a welding seam. By means of transverse magnetic flux heating, the heating range and efficiency are effectively controlled, the coil provided with the magnetizer is used for conducting heat compensation on the low-temperature part, the situation that the temperature of a welding face is not uniform due to the boundary effect is avoided, and the welding defects such as cold welding, slotting and edge waves can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of induction welded pipes, in particular to a lateral induction straight seam welding device and method for thick-walled pipes. Background technique [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 las...

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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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