Common problems in the removal process of internal burrs include eccentric, deep, shallow, etc., which of them will affect the quality of weld detection and reduce the yield of welded pipes. In particular, the internal burr is deeply scraped and the wall thickness of the weld is up to If the requirements are not met, the bearing capacity is insufficient here. In severe cases, the welded pipe may burst. The methods for removing burrs in ERW welded pipes are generally divided into two types: online and offline. The on-line removal method is to use the inner burr trimming blade on the inner burr trolley on the traction rod to carry out, and use the relative movement of the tool to plan off the burrs.
1. Internal burrs shaved biased
When the internal burrs are shaved very biased, there will be steps on the inner wall of the welded pipe at the weld, and the online flaw detection of the weld will alarm and affect the weld quality of the welded pipe. The reason for the internal burr is that the internal burr on the drawbar is scraped from the internal burr on the trolley. The center line of the blade does not coincide with the center line of the burr in the welded pipe, resulting in deviation. Through the inspection of the welded pipe opening, it can be found that the internal burr removed is obviously scraped. The internal burr blade has scratched the base material. Check the position of the tow bar, adjust the position of the tow bar to ensure that the mechanical connection of the tow bar is good, so as to ensure that the tow bar will not shake during work, which will affect the quality of the internal burr. It is also necessary to check whether the internal burr trolley on the tow bar is Place it in the correct working position and check whether the blade screws on the inner burr trolley are loose.
2. Internal burr shaved deep
When the internal burr is scraped deeply, the wall thickness of the weld will not meet the requirements, resulting in insufficient pressure-bearing capacity, and in severe cases, the pipe may burst.
Through the inspection of the physical burr, it is found that the inner burr is too deep, and part of the substrate has been scraped off. When the inner burr blade is working, its working height is relatively high to the inner wall of the welded pipe. If the height of the inner burr blade does not meet the requirements, it will cause Deep inner burr scraping or shallow scraping, at this time, you need to adjust the working height of the inner burr blade to ensure that its height is within the standard range. In addition, check the fasteners on the inner burr trolley to ensure that they are tightly fitted to avoid Loose when working.
3. Shallow shaving of internal burrs
When the inner burr is 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 inspection quality of the weld. The fastening screw of the burr blade to ensure that it will not deviate from the correct working position due to uneven force during work, and the fixing seat of the traction rod needs to be checked to ensure that the traction rod will not be caused by looseness during work In the process of shaving internal burrs, the traction rod is not in the correct working position due to the force.
When the internal burr is shallow, since it can no longer be removed online, it needs to be removed offline by the internal burr removal device. After the offline internal burr removal is completed, offline inspection is required to ensure the quality of the weld. In addition, if the offline inspection is not Qualified, further manual inspection of the weld is required to ensure the quality of the weld and avoid the unqualified welded pipe due to the quality of the weld.
When removing internal burrs of ERW welded pipe(astm a53 erw
), there are mainly problems such as offset, deep scraping, shallow scraping, etc. Each problem will affect the weld quality of the welded pipe. Therefore, in the production process of welded pipe, it is necessary to pay attention to removing the internal burr to ensure that it is removed. The subsequent internal burr meets the standard.