Method of tubing manufacturing

Abstract

A method of tubing manufacture comprising forming a tube having an internal artifact projecting radially inward from a tube inner surface, retaining the tube in a fixture, broaching an end of the tube to remove a longitudinal portion of the internal artifact which longitudinal portion is less than a total length of the tube, finishing the radius of the internal artifact so it is substantially equal to a radius (R 1 ) of the adjacent inner surface, and forming a single flare on the end of the tube.

I claim: 
     
         1 . A method of tubing manufacture comprising:
 forming a tube having an internal artifact projecting radially inward from a tube inner surface;   retaining the tube in a fixture;   broaching an end of the tube to remove a longitudinal portion of the internal artifact which longitudinal portion is less than a total length of the tube;   finishing the radius of the internal artifact so it is substantially equal to a radius (R 1 ) of the adjacent inner surface; and   forming a single flare on the end of the tube.   
     
     
         2 . The method of tubing manufacture as in  claim 1  comprising extending the broach within the tube for a longitudinal distance that is at least greater than a radius of the tube. 
     
     
         3 . The method of tubing manufacture as in  claim 1 , wherein the internal artifact is a weld bead. 
     
     
         4 . The method of tubing manufacture as in  claim 1 , wherein the broach is linear. 
     
     
         5 . The method of tubing manufacture as in  claim 1 , wherein the weld bead is chamfered. 
     
     
         6 . The method of tubing manufacture as in  claim 1  comprising forming a second flare in the end of the tube. 
     
     
         7 . A method of tubing manufacture comprising:
 forming a tube having a weld bead projecting radially inward from a tube inner surface;   retaining the tube in a fixture;   broaching the tube a longitudinal distance at least greater than a radius of the tube to remove a longitudinal portion of the weld bead, which longitudinal portion is less than a total length of the tube;   finishing the radius of the weld bead so it is substantially equal to a radius (R 1 ) of the tube; and   flaring the broached end of the tube.   
     
     
         8 . The method as in  claim 7  comprising applying a second flare to the broached end of the tube. 
     
     
         9 . The method as in  claim 7  wherein the flare comprises an angle of approximately 37°.