Regarding the issue of secondary anti-corrosion at the welding joint between galvanized steel pipe and flange

According to GB50263-2007 standard 5.5.1, secondary anti-corrosion treatment must be carried out on the welding joint between galvanized steel pipe and flange. There are two common ways to choose from on how to implement secondary anti-corrosion treatment. One way is to re-hot dip galvanize. However, it should be noted that if you choose this method, you need to remove all previous galvanizing before hot-dip galvanizing again. This method is relatively complex and requires certain technical and process support. Another common practice is to paint the welded area with zinc-rich paint or use hot-dip galvanized spray paint for anti-corrosion treatment. This method is relatively simple to operate and can effectively protect the welding joint from corrosion. At the same time, this method is relatively low-cost, saving the cost and time of hot-dip galvanizing again. In fact, for the secondary anti-corrosion treatment of the welding joint between galvanized steel pipe and flange, the appropriate method should be selected based on the actual situation and needs. You can choose a suitable treatment method based on comprehensive considerations such as project requirements, budget, construction period and other factors, and consult professionals or manufacturers for advice. .