Method for numbering welds

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In production, weld numbering is an essential step. But how can it be done correctly to better meet the needs of production? Here are my personal views: Those who work in welding processes should be aware that quality assurance systems have specific rules and requirements regarding weld numbering. However, the numbering rules in many companies’ quality assurance systems are not very suitable for actual production. As we all know, the general principle is to number the welds from top to bottom, from left to right, from inside to outside, or in a clockwise or counterclockwise direction, as A1, A2, A3, A4, and so on. B1, B2, B3, B4------: first the cylinder body, then the nozzles, and finally the nozzles and flanges. However, this numbering method isn’t the best. As we all know, the cutting process in the workshop doesn’t always follow what’s specified in the process card. For example, the process card may indicate that the cylinder body consists of 3 sections, but to save material, the workshop might use 4 sections, or there might be two longitudinal seams on one section. If we use the previous welding seam numbering method, it would be necessary to renumber almost all of the welds, which is very troublesome and can lead to confusion. This also causes a lot of difficulties for inspectors. Everyone can take a look at this alternative numbering method: for the cylinder body, the welds can be numbered from top to bottom, from left to right, from inside to outside, or in a clockwise or counterclockwise direction. As for the welds on the nozzles and between the nozzles and flanges, they can be numbered according to the pipe identifier. For instance, the butt joint seam at pipe interface A can be called Ba; the seam where it is welded to the cylinder body can be called Da, and the seam where it is welded to the flange can be called Ca. In this way, even if the number of sections or longitudinal seams changes, it won’t affect the numbering of the welds. If anyone has a better numbering method, I’d like to hear it from you. This post was last edited by yaoyongyoyo on 2009-3-25 09:11