| 摘要 |
497,557. Making steam superheaters. BABCOCK & WILCOX, Ltd. May 23, 1938, No. 15341. Convention date, May 25, 1937. [Classes 83 (ii) and 83 (iv)] Uniting by fusion.- A welded joint between a tube and a pressure vessel, which are so composed as to be incapable of being readily united directly to each other by welding, is formed by utilizing at least one intermediate part of a composition which is different from that of either the tube or vessel and which is readily welded to the adjacent portions of the joint. In welding a number of tubes 2 to a steam superheater header 1, sleeves 5 of easily weldable metal different from that of the tubes or vessel are first welded at 7 and 8 in the shop to the tubes and are subsequently placed in counterbored holes in the header and the sleeves welded in the field to the header at 9. The sleeve mav be of appreciably greater thickness than the tube. In a modification, Fig. 5, sleeves 5 of weldable metal are welded at 7 and 8 to the tubes 2, a weld deposit 10 of readily weldable alloy different from that of the header 1 is applied to the header, the deposit is then machined at 11, drilled and counterbored, and the sleeves inserted and welded thereto at 9. |
