Historical
DIN 2559-3:1990
Preparation of welds; matching of inside diameters for circumferential welds on welded pipes (FOREIGN STANDARD)
For welded steel pipes type of grooves and dimensions for matching of inside diameter are given for connecting pipes from different suppliers by welding. By matching the inside diameter, a smooth transition without projection at connections should be produced. Dimensions for matching diameters are given for pipe outside diameter and nominal wall thickness.
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Deutsches Institut für Normung [din]