High temperature welded stainless steel plate heat exchanger is an efficient heat exchange device that achieves heat exchange between fluids by stacking multiple thin stainless steel plates to form countless microchannels. This type of heat exchanger has the advantages of compact structure, high heat transfer efficiency, high temperature resistance, corrosion resistance, etc., and is particularly suitable for gas waste heat recovery under high temperature conditions. High temperature gas enters one side of the heat exchanger, while low temperature gas enters the other side. Two types of gases exchange heat in the channels of thin stainless steel plates, and high-temperature gases transfer heat to low-temperature gases, achieving waste heat recovery. Widely used in industrial furnaces, metallurgical industries, chemical industries, incinerators, and other places. Plate heat exchangers have significant advantages in gas waste heat recovery, which can effectively improve energy utilization efficiency and reduce production costs. When selecting and using this type of heat exchanger, factors such as the characteristics of high-temperature gases and process requirements should be comprehensively considered, and appropriate models and materials should be selected.