Welding to a Flange

Written by Jerry Ratzlaff on . Posted in Pipe Flanges

When welding a flange, fitting or a piece of pipe together the gap spacing for welding them is established by the Welding Qualification.  API Std 1104 (Standard for Welding of Pipelines and Related Facilities) calls for a 1/16" space.  On a socket weld, its 1/16" and can be established with a special spring.  The offset between welds cannot be greater than 1/8".       

When welding a slip-on flange, the pipe or fitting is set back from the face of the flange a distance equal to the wall thickness -0" +1/16".

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