Welding burr scraping method and scraping device for large-diameter submerged arc welded pipe

Abstract

The invention relates to a welding burr scraping method and a scraping device for large-diameter submerged arc welded pipes. The device includes: a first scraper, a second scraper, and a third scraper are respectively connected to the three scrapers through three connecting shafts in the center. The three connecting shafts are respectively connected with three length-adjustable support arms, and the lower ends of the three support arms are equipped with swing connecting devices, and the three swing connecting devices are evenly arranged on the same mobile connecting device. The spacing distance is the same as d, the mobile connection device is installed along the axial direction of the welded pipe, an image acquisition device is installed at the front end of the mobile connection device, and three clamping trolleys with the same shape and structure are installed under the mobile connection device, and the three trolleys are installed inside the welded pipe On the magnetic rod, the mobile connecting device can be driven to move along the axial direction of the welded pipe on the magnetic rod. The invention can realize the online layered scraping of the burrs of the large-diameter submerged arc welded pipe, reduce scraper wear, and improve scraper life and scraping precision.

Description

technical field [0001] The invention relates to the field of welding, in particular to a welding burr scraping method and a scraping device for large-diameter submerged arc welded pipes. Background technique [0002] Petroleum pipe is the foundation of the petroleum industry, and the production of high-reliability deep-sea oil pipe is of great significance. However, after submerged arc welding, welding burrs will be produced in the pipe seam. When oil is transported, the protrusions at the weld seam are prone to stress concentration and corrosion, resulting in changes in the overall strength of the weld seam, and plastic deformation occurs under the superposition of various complex stresses. Lead to weld damage and leakage. [0003] In actual production, it is difficult to effectively remove the internal burrs at the weld seam of large-diameter oil pipes. Off-line manual grinding is generally used in enterprises, which has a low degree of automation, low production efficien...

AI Technical Summary

Problems solved by technology

However, after submerged arc welding, welding burrs will be produced in the pipe seam. When oil is transported, the protrusions at the weld seam are prone to stress concentration and corrosion, resulting in changes in the overall strength of the weld seam, and plastic deformation occurs under the superposition of various complex stresses. Lead to weld damage and leakage

[0003] In actual production, it is difficult to effectively remove the internal burrs at the welding seams of large-diameter oil pipes. Off-line manual grinding is generally used in enterprises, which has a low degree of automation, low production efficiency, high labor intensity, and difficult control of grinding quality.

It is difficult for the scraper to feed and position accurately, and it is easy to scrape off or deep, which reduces the service life of the welded pipe

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