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Fully welded plate heat exchanger, the entire plate bundle is made of special stainless steel and welded by argon arc welding. It does not use any non-metallic materials for sealing. It has high temperature resistance, pressure resistance and corrosion resistance. It is suitable for most heat exchange process occasions where conventional plate heat exchangers cannot be applied. It is a heat exchange equipment that combines the advantages of detachable plate heat exchangers and shell and tube heat exchangers. The heat exchange plates are pressed by a special mold and have a smooth surface that is not prone to scaling. Its special corrugated design allows the fluid to generate turbulent flow at a lower flow rate. It has high heat transfer efficiency, compact structure, and is easy to use. It is widely used in petroleum, chemical industry, steel plants, power plants, metallurgy and other industrial fields. From the appearance point of view, the detachable plate heat exchanger can be directly disassembled. Usually the four inlet and outlet positions are on the same side frame plate, while the four ports of the fully welded plate heat exchanger are at the upper, lower, left and right positions on the side, and the frame itself has no openings. Characteristics of fully welded plate heat exchanger: 1. High heat transfer efficiency. The plate structure adopts a special corrugated structure shape and spacing. The fluid flow pattern is complex, and strong turbulence can be generated at a low flow rate, so that its heat transfer capacity can be exerted to a certain extent and higher heat transfer performance can be obtained. Compared with shell and tube heat exchangers, the total heat transfer coefficient is 3-5 times that of shell and tube heat exchangers. ； Under the same heat exchange conditions, its heat exchange area is only 1/3-1/4 of that of the shell and tube type. ； In addition, the minimum fouling coefficient of the fully welded plate heat exchanger is only 1/5 of the tube heat exchanger, and the heat exchange performance is excellent. 2. Wide range of application: Its special all-welding process does not require non-metallic materials for sealing. The structural design is diverse and can be applied under higher temperatures and pressures. 3. Small pressure loss. The special corrugated plate structure allows fluid to fill the flow channel formed between the plates. All plate surfaces participate in heat exchange. The medium can flow without dead zones in the flow channel, which can reduce the consumption of kinetic energy to a certain extent and save operating costs. 4. Compact scaling and small footprint. The fully welded plate heat exchanger has a compact structure and a wide expansion range for applicable space conditions. The heat exchange area per unit area is 2-5 times that of the shell-and-tube heat exchanger, and there is no need to reserve maintenance space for extracting the tube bundle. When achieving the same heat exchange task, the floor area of the fully welded plate heat exchanger is about 1/6-1/10 of that of the shell-and-tube heat exchanger. * * Reduce infrastructure investment costs. 5. It is not easy to scale. The heat exchange plates are welded around. During operation, they are affected and restricted by thermal stress, causing the inside of the plates to expand and contract freely, so the surface of the plates is not easy to scale.