Quality control method for high-frequency longitudinal welded pipe

A technology of straight seam welded pipe and high frequency welded pipe, which is applied in the field of quality control of high frequency straight seam welded pipe, which can solve the problems of reducing the quality of welded seam, large residual stress of welded pipe, and large temperature difference in temperature distribution, so as to reduce the cost of adjustment process, Effect of quality improvement and uniform temperature distribution

Active Publication Date: 2021-04-20
维格斯湖北流体技术有限公司
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Problems solved by technology

[0003] The high-frequency straight seam welded pipe mainly uses the skin effect of high-frequency current, resulting in the highest magnetic induction intensity of the induced magnetic field at the weld seam at the inner and outer edges, and the induced magnetic field generates an induced current, and the current gene

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  • Quality control method for high-frequency longitudinal welded pipe
  • Quality control method for high-frequency longitudinal welded pipe
  • Quality control method for high-frequency longitudinal welded pipe

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[0039]Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0040]In order to better understand the technical solutions of the present invention, specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings and examples. It is now simulated by the ERW tube welding process, and the welding of the tube is observed to observe the temperature distribution status to verify the feasibility of the method. Select ERW pipe material to X80 steel, specification is φ355.6 × 12.7, and numerical simulation.

[0041]figure 1 A welding process of the present invention, wherein the electrode 4 is connected to the AC power source, under the action of the electrode 4 and the magnetic rod 5, since the skin effect, the vicinity, the V-axis vertex 1 starts to warm to the welding temperature. While heating, the tube 3 is moved along the welding direction 7, and the extrusion roller 2 extruded...

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Abstract

The invention discloses a quality control method for a high-frequency longitudinal welded pipe. The method comprises the following steps: defining key parameters of trimming treatment, carrying out pre-welding trimming treatment on a welded edge of a pipe blank, and establishing a corresponding relationship between each parameter and temperature difference distribution in the wall thickness direction of a weld joint through software finite element analogue simulation, so as to realize control on each parameter of trimming treatment. Compared with the prior art, the invention has the advantages that main parameters for controlling the shape of the welding edge are defined, the influence of all the parameters on the temperature difference is explored, the induced current generation environment is improved, the temperature difference value of the highest temperature and the lowest temperature in the wall thickness direction of the welding seam is reduced, more uniform temperature distribution is generated, and the welding quality of the welding seam is improved; by means of finite element software numerical simulation, a welding edge shape parameter control method is established, time and capital cost brought by a trial-and-error method in actual production is avoided, and therefore the control process cost is greatly reduced while the quality of the high-frequency longitudinal welded pipe is improved.

Description

technical field [0001] The invention belongs to the field of high-frequency welded pipe production, and in particular relates to a quality control method for high-frequency straight seam welded pipes. Background technique [0002] High-frequency straight seam welded pipe is a kind of pressure welding without flux filling. It mainly uses the skin effect and proximity effect of high-frequency current to rapidly increase the temperature on both sides of the weld to the weldable temperature. The weld zone is fused into one. Compared with seamless steel pipes, high-frequency straight seam welded pipes have the advantages of high production efficiency, good mechanical properties, and strong compression resistance. At present, they have been widely used in oil and gas transportation. The proportion of welded pipes in oil well pipes used in the United States, Japan and other developed countries has accounted for half, while that in my country is only one-tenth, and they are mostly ...

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Application Information

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IPC IPC(8): G06F30/23
Inventor 韩毅牛身身
Owner 维格斯湖北流体技术有限公司
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