DIN 8552-3
DIN 8552-3 Joint preparation - Groove forms on copper and copper alloys - Part 3: Gas welding and gas-shielded arc welding
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2006
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2006