A buttweld fitting is a weldable pipe fitting that allows for change of direction of flow, to branch off, reduce pipe size or attach auxiliary equipment.
The WPB is not short hand for any process. It is simply an identifier developed by ASTM.
ANSI B16.9 ASTM A234 WPB Eccentric Reducer manufactured using superior grade raw materials.
Big diameter elbows are curved connecting pieces that join straight lengths of pipe, commonly at a 90° or 45° angle, allowing obstructions to be avoided in plumbing, ventilation, welding, and automotive applications.
ASTM A234 WPB steel pipe fittings is one of the most common pipe fittings used for pressure piping systems of moderate and high temperature services.