| 摘要 |
<p>A method of making a rigid stainless steel, corrosion resistant. welded, tubular heat exchanger and the resulting heat exchanger for exchanging heat between fluids in which a pair of steel tubes 12, 13 with stainless surfaces are arranged in internested spaced relationship, providing a pair of cylindrical steel fillings 15 with stainless steel surfaces at each end 20 of the outer tube and welded to the outer tube on a shoulder of the outer tube by projection welding in which the contacting surfaces of the fitting and the tube are electric resistance welded, the ends of the inner and outer tubes being similarly welded together. Turbulators 14 are fitted between the tubes. <IMAGE></p> |
