More about ASME B16.25

This Standard covers the preparation of buttwelding ends of piping components to be joined into a piping system by welding. It includes requirements for welding bevels, for external and internal shaping of heavy-wall components, and for preparation of internal ends (including dimensions and tolerances). Coverage includes preparation for joints with the following:
no backing rings
split or noncontinuous backing rings
solid or continuous backing rings
consumable insert rings
gas tungsten arc welding (GTAW) of the root pass
Details of preparation for any backing ring must be
specified when ordering the component.
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