Welding method and system used for machine-adjacent pipeline of centrifugal compressor

Abstract

The invention discloses a welding method and system used for a machine-adjacent pipeline of a centrifugal compressor. The welding method comprises the following steps of: dividing the outer wall at ato-be-welded part of the pipeline into a plurality of areas, analyzing according to a stress condition of the area in which a weld pool is located, and separately setting welding parameters of manualelectric-arc welding and a welding instruction of an automatic welding machine, wherein the manual electric-arc welding and the automatic welding machine separately correspond to a welding point and awelding seam on each area; after setting the welding parameters, performing pipeline backing welding on welding points on different areas through manual electric-arc welding; and filling welding seams at welded parts on different areas through the automatic welding machine with the set welding instruction, thereby forming cover surfaces capable of covering the welding points on the surfaces of the welding seams. The welding method can greatly reduce an error rate caused by human factors in a pipeline welding operation process, avoids welding rework, reduces working strength of a welding operator, and improves production efficiency.

Description

technical field [0001] The invention belongs to the technical field of pipeline welding, and in particular relates to a welding method and system for a machine-side pipeline of a centrifugal compressor. Background technique [0002] Centrifugal compressor is a kind of blade rotating machine, which is widely used in metallurgy, petrochemical, natural gas transmission, refrigeration and power industries. [0003] Among them, the side pipeline of the centrifugal compressor is a group of pipelines used to transport compressor lubricating oil, process gas and other media. Between them, it is welded by pipes and pipe fittings. The weld seam of the pipeline requires radiographic flaw detection to meet the NB / T 47013 standard Class I qualification, because the quality of the weld seam will directly affect the transmission effect of lubricating oil, process gas and other media, and then It affects the running quality of the compressor, and at the same time affects the appearance qua...

AI Technical Summary

Problems solved by technology

Due to the complicated three-dimensional direction of the centrifugal compressor pipeline, all-position welding is required, and more than 50% of the welds need to be welded, and problems such as uneven assembly gaps and serious pipeline errors exist all the year round.

Therefore, the welding of this pipeline is difficult, the work intensity is high, the operation level of the welder is high, the process repeatability is poor, and the pass rate of the first-time radiographic inspection is only 90%.

[0005] In the actual work of the centrifugal compressor, due to the poor quality of the welding seam of the pipeline beside the machine, media such as lubricating oil and process gas often leak from the welding seam, which seriously affects the operation quality and appearance quality of the centrifugal compressor

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