Plate heat exchangers are ideal for heat exchange between liquid-liquid and liquid-vapor. The utility model has the advantages of high heat exchange efficiency, small heat loss, compact and light structure, small occupied area, wide application and long service life. In the case of the same pressure loss, the heat transfer coefficient is 3-5 times higher than that of the tubular heat exchanger. If the plate heat exchanger is used for a period of time, it may be loose or damaged, which requires us to repair it. Only by adopting this method can it be strengthened. What is the welding repair of the plate heat exchanger?
(1) Clean the plate heat exchanger maintenance area before welding, and brush the chlorate soldering agent on the welding surface.
(2) The silver-based electrode used for welding has a silver content of at least 45%, and the temperature during welding should not exceed 650 ℃, so as not to affect the welding strength.
(3) The plate heat exchanger is laid flat before welding, and the heat exchanger is filled with water. Wrap the vicinity of the weld zone with a damp cloth to prevent high temperatures generated during welding from being transmitted to the vicinity to melt other places or affect the weld strength.
(4) It should be controlled that the continuous welding time should not be too long to reduce the excessive heat affected.The plate heat exchanger is welded to enhance the load carrying capacity and greatly improve the efficiency.