Welding burr scraping method for heavy-caliber submerged arc welded pipe and scraping device

Abstract

The invention relates to a welding burr scraping method for heavy-caliber submerged arc welded pipe and a scraping device. The device comprises a first scraper, a second scraper and a third scraper which are respectively connected to three scraper rotation connecting devices through three connecting shafts at the center, wherein the three connecting shafts are respectively externally connected with three length-adjustable support arms; swing connecting device are respectively arranged at the lower ends of the three support arms; the three swing connecting devices are uniformly arranged on thesame movable connecting device; the interval distance between every two swing connecting devices is equal to d; the movable connecting device is arranged in the axial direction of the welded pipe; animage acquisition device is arranged at the front end of the movable connecting device; and three clamping trolleys with the same shape and structure are arranged below the movable connecting device and are arranged on a magnetic rod in the welded pipe, and can drive the movable connecting device to move on the magnetic rod in the axial direction of the welded pipe. According to the method and thedevice, on-line layered scraping of burrs of the heavy-caliber submerged arc welded pipe can be achieved, scraper abrasion is reduced, the service life of the scraper is prolonged, and scraping precision is improved.

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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