Method of sealing the end of a filled welding rod

Abstract

In the manufacture of filled tube rods the ends of the rods are sealed with a solid organic film volatilizable at welding temperature to provide a contaminant free weldment. The organic film is preferably a sealant composition containing pyroxylin (nitrocellulose), ether, and absolute alcohol as principal ingredients, and dried by very rapid means, i.e., infrared heating.

We claim:  .[.1. The method of closing filled tube rod ends comprising the steps of reducing the diameter of the ends and sealing with a solid organic film volatilizable at welding temperature to provide a contaminant free weldment..]. .[.2. The method as claimed in claim 1 wherein the solid organic film comprises principally pyroxylin and alcohol..]. .[.3. The method of claim 1 wherein the sealing step is followed by drying said sealed ends by exposure to infrared heat..].  .[.4. The method of claim 1 wherein the sealant consists essentially of, in volume percent: 
     
        .Iaddend..Iadd. 16.  A filled tube welding rod made by the method of claim 15. .Iaddend..Iadd. 17. Method of closing the end of a filled tube welding rod, comprising: a. reducing the transverse cross-sectional area of the end of the rod;   b. and subsequently sealing the reduced end of the rod with solid organic material volatilizable at welding temperature, by contacting the reduced end of the rod with a solution comprising pyroxylin and alcohol and thereafter exposing the said reduced end of the rod to infrared heat to dry the reduced end of the rod. .Iaddend.