A welding equipment suitable for multi-layer and multi-pass welding of the inner wall of oil pipeline

Abstract

The invention discloses a welding device suitable for the multilayer multi-pass welding of a petroleum pipeline inner wall. The welding device successively includes a support conveying assembly, a middle control rotary assembly, and a welding tracking assembly. The welding device can flexibly drive a workpiece to rotate during the welding, so that the workpiece can be prevented from left and right moving and slipping during the rotation, and the damage of equipment and pipelines can be prevented. In addition, the middle control rotary assembly can realize the aligning and positioning of pipeline. At the end, the welding tracking assembly can accurately position and rapidly output positioning information, so that a welding gun can rapidly and accurately move along the changing of the welding positions. Therefore, the weld forming effect and the weld quality can be effectively guaranteed, and the high-quality and high-efficiency pipeline inner wall multilayer multi-pass welding can be realized.

Description

technical field [0001] The invention relates to welding equipment suitable for multi-layer and multi-pass welding of the inner wall of oil pipelines, belonging to the technical field of natural gas pipeline welding. Background technique [0002] At present, in the actual industrial production process, in order to ensure the corrosion resistance of the oil pipeline and improve the service life of the pipeline, the material of the lining pipe is 316L stainless steel with a thickness of about 3mm, and the material of the outer base pipe is carbon steel with a thickness of 10-12mm. Composite panels and pipelines are about 10-20 meters long when they leave the factory. The need for long-distance oil transportation can be realized by splicing these steel pipes. [0003] During the splicing process of composite steel plates, due to the connection interface of dissimilar materials at the butt joint position, the welding performance is poor, and the strength of the pipeline cannot me...

AI Technical Summary

Problems solved by technology

[0005] However, this kind of welding method that completely fixes one end and only retains the degree of freedom of rotation, in actual production, due to the deflection of the pipeline, the other end of the pipeline has a large jump and a short-term stuck phenomenon, which makes When the fixed end of the chuck rotates, it will be subjected to a large torque, and the pipe may be partially deformed

The jumping pipe will also have a great impact on the supporting base. Under the reaction force, even with a spring shock absorber, the base and the outer wall of the pipe will still receive a large force, so there is a risk of damage to the base and deformation of the pipe. possible

[0006] In addition, because the pipe section is not a standard circle, the arc may be different at each point. During the welding process of the welding torch, since the welding torch and the pipe are fixed, when the pipe rotates, the distance between the welding torch and the pipe will change. There is a certain disturbance in the length of the arc, and the arc cannot ensure the height of the welding surface, and the shape of the molten pool will be affected, which will make the forming of the weld worse. In the subsequent multi-layer multi-pass welding, The welding quality may not be guaranteed, and the operator needs to adjust the welding parameters reasonably

Every time the next seam is welded, the parameter setting is adjusted according to the welding situation of the previous stage, which puts forward requirements on the technical level of the operator. Although some robot companies have launched multi-layer multi-pass welding software packages, there are limitations , such as the number of weld beads, welding track points, and weld layers are limited, let alone variable-length weld calculations, and manual programming also takes a lot of time, resulting in low work efficiency

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