Apparatus for Joining Pipe Sections

Abstract

The present invention relates to a method and apparatus to be used when welding two abutting sections of pipe or tubing, and also to purge blocks for establishing a localized inert atmosphere inside two abutting pipe sections in the region of a desired weld joint. The present invention comprises an inflatable bladder with elongated engaging members that can be removable positioned within the ends of two abutting pipe sections in order to center the two abutting sections of pipe and create the purge block.

I claim: 
     
         1 . A pipe joining apparatus comprising:
 a. An inflatable bladder; and   b. At least one elongated engaging member securely attached and circumferentially displaced about said inflatable bladder such that said elongated engaging member is positioned between the inside walls of abutting pipe sections sought to be joined and said bladder, and further engages the inside walls of said abutting pipe sections.   
     
     
         2 . The pipe joining apparatus of  claim 1 , wherein said inflatable bladder further comprises:
 a. A rearward balloon type portion, a forward balloon type portion, and a middle portion;   b. Said middle portion containing at least one aperture; and   c. A means for introducing an inert gas into said inflatable bladder.   
     
     
         3 . The pipe joining apparatus of  claim 3 , wherein said elongated engaging member is securely attached to the middle portion of the inflatable bladder. 
     
     
         4 . The pipe joining apparatus of  claim 4 , wherein said inflatable bladder further comprises a high temperature resistant material.