How to choose welding materials for welding joints of heat exchanger shell side discharge ports

When welding the shell-side discharge port of the heat exchanger, it is recommended to use welding materials similar to the base material to ensure that the welded joint has sufficient strength and corrosion resistance. For the tube sheet, pipe and shell side cylinder materials given in this question, it is recommended to use the following welding materials: - If it is manual welding, you can choose AWS E309L series electrodes or E309L-16 electrodes, which are suitable for welding between stainless steel and carbon steel (or low alloy steel). - For automated welding, you can choose ER309L welding wire, which is a multi-element stainless steel welding wire suitable for welding between stainless steel and general structural steel. Among them, L-type welding consumables represent low carbon content, which is beneficial to reducing the risk of intergranular corrosion. Please make the final choice based on the specific welding process requirements and actual site conditions. .

For the welded joints in this heat exchanger, it is recommended to use the following welding materials: - For the welded joints on the tube sheet, you can use the same stainless steel welding materials as the tube sheet, such as AWS ER316L welding wire or electrode, which is a low-carbon content tungsten-molybdenum type welding wire suitable for 316 stainless steel and has excellent resistance to intergranular corrosion. - For the welded joint between the pipe and the shell side cylinder, it is recommended to choose the same welding material as the shell, such as AWS ER80S-G or ER70S-6 welding wire or rod. They are low alloy steel welding consumables with excellent strength and toughness and are suitable for welding between pipes and shells. When selecting welding consumables, you also need to consider the welding process, environmental conditions, stress conditions and other factors to ensure that the welding will meet all technical requirements and safety standards. It is recommended that during actual operation, the welding process parameters should be adjusted based on the specific situation, and the quality of the joint should be inspected after the welding is completed to ensure that its quality meets the requirements. .