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    Method of attaching a carbide ring to a steel tube
    272.
    发明授权
    Method of attaching a carbide ring to a steel tube 失效
    将碳化硅环连接到钢管的方法

    公开(公告)号：US3585710A

    公开(公告)日：1971-06-22

    申请号：US3585710D

    申请日：1968-12-30

    Applicant: PAN AMERICAN PETROLEUM CORP

    Inventor： WILDER LAWRENCE B ,  VINCENT RENIC P

    IPC: B23K1/20 ,  B23K31/02

    CPC classification number: B23K1/20 ,  B23K2201/06 ,  Y10T29/49911

    Abstract: THIS IS A METHOD OF ATTACHING A CARBIDE RING TO THE OUTSIDE OF A STEEL TUBE SUCH AS A VALVE STEM. IT OVERCOMES THE PROBLEM CAUSED BY THE DIFFERENCE IN THERMAL COEFFICIENT OF EXPANSION BETWEEN CARBIDE AND STEEL. IN THE PREFERRED EMBODIMENT OF THE METHOD EMPLOYED, MOLTEN BRAZING COMPOUND AT A HIGH TEMPERATURE, E.G., 1,700*F., IS MELTED IN THE CLEARANCE SPACE BETWEEN THE CARBIDE RING AND THE STEEL TUBE. THE CARBIDE RING IS ALLOWED TO COOL TO ABOUT 1,000*F. WHILE THE STEEL TUBE IS KEPT HOT TO ABOUT 1,500* F. BY APPLYING HEAT TO THE INSIDE. A STEEL PLUG IS THEN PLACED INSIDE THE STEEL TUBE ADJACENT THE CARBIDE RING. THIS STEEL PLUG HAS BEEN SIZED TO HAVE A DIAMETER, AT ROOM TEMPERATURE, EQUAL TO THAT OF THE INSIDE OF THE STEEL TUBE IN ITS EXPANDED POSITION AT 1,000*F. AFTER THE PLUG IS INSERTED, HEAT IS NO LONGER APPLIED AND THE CARBIDE RING CONTINUES TO SHRINK AND TO DISPLACE THE EXCESS SEMI-MOLTEN BRAZING COMPOUND. THE STEEL TUBE ALSO STARTS CONTRACTING UNTIL IT CONTACTS THE PLUG. THE PLUG WHICH WAS PUT INTO THE TUBE AT ROOM TEMPERATURE, E.G., 80*F., HAS HEAT TRANSFERRED TO IT FROM THE STEEL TUBE AND THE PLUG ITSELF STARTS TO INCREASE IN SIZE. THE STEEL TUBE WHEN IT CONTACTS THE PLUG WILL BE AT LEAST AT 1,000*F. AND IS SOFT ENOUGH TO YIELD EASILY. AS THE TEMPERATURE OF THE STEEL PLUG INCREASES, IT CONTINUES TO EXPAND AND CAUSES ADDITIONAL YIELDING OF THE STEEL TUBE WHICH YIELDS SUFFICIENTLY SO THAT WHEN IT AND THE CARBIDE RING COOL, THEY DO NOT SEPARATE.

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