... tube & Fin economizer, is used in boilers, marine power, heat exchanger components Definition:H fin tube, also know as Doulbe H ... boilers, industrial boilers, marine power, such as the tail of heat exchanger components. Principle:H-economizer two rectangular fin, similar to a ... flash resistance welding processes used, the welding seam after the high rate of fusion, weld tensile strength, and has good ...