Common problems and solutions for removing burrs in high-frequency welded pipes

Common problems in the removal process of internal burrs include scraping, deep scraping, shallow scraping, etc., any of which will affect the quality of weld flaw detection and reduce the yield of welded pipes, especially the thickness of the weld at the weld due to deep scraping of internal burrs. If the requirements are not met, the bearing capacity here is insufficient. In severe cases, the welded pipe may burst. The methods for removing burrs in straight seam welded pipes are generally divided into online and offline. The removal method is to use the inner burr grinding blade on the inner burr trolley on the drawbar, and use the relative movement of the cutter to plan off the burrs.

Internal burr scraping
When the internal burr is scraped off, steps will appear on the inner wall of the welded pipe at the weld seam, which will cause the online flaw detection of the weld to alarm and affect the weld quality of the welded pipe. The center line of the blade and the center line of the burr in the welded pipe do not coincide, resulting in scraping. Through the inspection of the opening of the welded pipe, it can be found that the scraped internal burr is obviously scraped off. The inner burr blade has scratched the base material. At this time, it is necessary to Check the position of the drawbar, and adjust the position of the drawbar to ensure that the mechanical connection of the drawbar is good, so as to ensure that the drawbar will not shake when it is working, which will affect the quality of scraping internal burrs. It is also necessary to check whether the inner burr trolley on the drawbar is Put it in the correct working position, whether the blade screw on the inner burr trolley is loose.
Internal burr deep scraping
When the internal burr is scraped deeply, the wall thickness of the weld seam cannot meet the requirements, resulting in insufficient pressure bearing capacity, and in severe cases, it may cause the tube to burst.
Through the inspection of the physical burr, it was found that the inner burr was scraped too deep, and part of the base material had been scraped off. When the inner burr blade was working, its working height was relative to the inner wall of the welded pipe. If the height of the inner burr blade did not meet the requirements, it would cause For deep internal burr scraping or shallow scraping, at this time, it is necessary to adjust the working height of the internal burr blade to ensure that its height is within the standard range. In addition, check the fasteners on the internal burr trolley to ensure that they are all fastened to avoid Loosen while working.
Shallow inner burr
When the inner burr is scraped shallow, it will cause the inner burr to protrude, which will seriously hinder the transportation of oil and gas. In addition, the inner burr will seriously affect the flaw detection quality of the weld. When the inner burr is scraped shallow, it is necessary to adjust the height of the inner burr blade and check the The fastening screw of the burr blade is to ensure that it will not deviate from the correct working position due to uneven force during work, and it is also necessary to check the fixing seat of the drawbar to ensure that the drawbar will not be loosened during work. During the process of scraping the internal burr, the draw bar is not in the correct working position due to the force.
When the internal burr is scraped shallow, because it can no longer be removed online, it needs to be removed offline with an internal burr removal device. After the offline internal burr is removed, offline flaw detection is required to ensure the quality of the weld. If it is qualified, further manual inspection of the weld is required to ensure the quality of the weld and avoid unqualified welded pipes due to weld quality problems.
When removing internal burrs of welded pipes, there are mainly problems such as scraping, deep scraping, and shallow scraping. Each problem will affect the weld quality of welded pipes. Therefore, in the production process of welded pipes, it is necessary to pay attention to removing internal burrs to ensure The inner burrs meet the standard.