GB877141A - Metal fabrication - Google Patents

Abstract

877,141. Making heat exchanger panels; stamping. OLIN MATHIESON CHEMICAL CORPORATION. Feb. 2, 1960 [Feb. 18, 1959], No. 3696/60. Classes 83 (2) and 83 (4). A method of fabricating a roll forged panel for refrigerator heat exchangers comprising interposing a weld - preventing material between superimposed metal sheets in a predetermined pattern of passageways and welding said sheets in their areas not separated by said weld preventing material is characterized in that the width of the applied weld inhibiting material 2 for each passageway 3 is in excess of the width required for distension of the desired configuration of the passageways, a restraining force being applied over the area of excess weldinhibiting material whilst the remaining unwelded portions of the panel are distended by pressure. The restraining force is effected by dies 6 and 7, the die 6 being recessed to impart the desired configuration, e.g. triangular, semicircular or rectangular to the expanded passages. The method gives added resiliency to the panel to withstand sudden pressure surges in the passageways. In a modification, the panel is expanded between unyielding platens 13 and 14, Fig. 8, with inserts 15 interposed between the platens and the excess width of weldinhibiting material 9. In a further modification, the lower inserts are dispensed with and inserts 16 of circular cross-section, Fig. 9, are substituted for the upper inserts. Specification 759,804 is referred to.