11.How to distinguish between hot galvanizing and cold galvanizing?
1) Distinguish from the appearance The overall appearance of hot-dip galvanizing is a little rough, which will produce process water lines, dripping tumors and other performances, especially one end of the workpiece is obvious, and the whole workpiece is silvery white. However, the surface layer of electrogalvanizing is relatively smooth, which is mainly yellow-green. Of course, there are also colorful, bluish-white, white and green, etc., and the whole workpiece basically will not appear zinc tumor, agglomeration and other phenomena.
2) Distinguish from the process. There are many processing techniques of hot dip galvanizing, which can only be dipped into the molten zinc bath after degreasing, pickling, dipping and drying the workpiece, and can be put forward after dipping for a certain time, so it is hot dip galvanizing, like some hot-dip pipe parts are processed in this way. In fact, cold galvanizing is electrogalvanizing, which is processed by electrolytic equipment. After degreasing, pickling and other processes, it is immersed in a solution containing zinc salt, connected with electrolytic equipment, and precipitated and deposited zinc layer on the workpiece during the current directional movement of positive and negative electrodes.
22.What are the uses of galvanized steel pipes?
Fire-fighting engineering: The existing fire-fighting water supply pipes are basically galvanized pipes, and a layer of paint is coated on the outer layer of the galvanized pipes, so that everyone can see the red fire-fighting pipes, which are actually only formed by processing galvanized pipes. 2). Steel structure, welding engineering: At present, many scaffolding factories are built outside. In the past, welded steel pipes were used, but the welded steel pipes are easy to rust. In order to prevent rust, a layer of paint should be applied. In order to solve this problem, many new steel structure projects now directly use galvanized pipes, which can save working hours and last longer. 3). Agriculture: It is mainly used to build warm greenhouses, to build flower sheds, and to make flowers and melons
33.Precautions for installation of galvanized steel pipe?
First, before installation, the galvanized layer of hot-dip galvanized pipe must be well protected to ensure that the surface of such products is free of any scratches. And keep the pipeline straight, without any clogging dirt inside. Second, before the hot dip galvanized pipe is installed, it is necessary to check whether the relevant threads of the product are complete and whether there are sand holes and cracks. Third, for the inner diameter of the cutting pipe, remember to ensure that there is no shrinking phenomenon. The cutting surface must be flush. Fourthly, in the process of processing the thread, remember to ensure that the scale of the thread must be adjusted to an accurate standard. Fifthly, try to use the corresponding hot dip galvanized pipe fittings privately after setting, and check to see if there are any broken wires or residual wires. Remember to clean the lubricating oil on the threads of hot-dip galvanized pipe machined by machine. Sixthly, when installing hot dip galvanized pipes, everyone should buckle with their hands before installing pipe fittings, which can help installers to exert more uniform force. After tightening the pipe fittings, make sure there are two or three threads left. Seventh, remember that there should be no looseness between the threaded pipe fittings, and then start to clean up the hemp silk at different interfaces. Eighth, the installed hot-dip galvanized pipe fittings and pipe sections should be adjusted effectively. It is also very important to adjust the scale and position during the installation of hot-dip galvanized pipe. After adjusting the position, further determine whether the hot dip galvanized pipe is firmly fastened, and then apply anticorrosive paint.