Patent ID: 8459527
Filing Date: 2013-06-11
Classification: B23K,Y10T

Abstract:
1. A welding jig capable of ensuring concentricity of an interior surface of a cylindrical pipe with (i) a circular outer periphery of a bolting flange; or (ii) a circular bolt hole pattern in said bolting flange; said welding jig comprising: (a) an elongate frame member, having a longitudinal axis capable of overlying a substantially planar face of said bolting flange, in a position substantially perpendicular to a longitudinal axis of said pipe, said elongate frame member comprising: (b) a chill block, situated on said frame member between said contact points but spaced therefrom, comprising: wherein said frame member, when said contact points thereon contact said circular outer periphery of said bolting flange or at least two bolt holes in said circular bolt hole pattern, maintains said curved outer surface of said chill block concentric with said circular outer periphery of said bolting flange or said bolt hole pattern during welding of material on said inner surface of said pipe.