This part of IS0 9692 applies to types of joint preparation for submerged arc welding with one wire electrode (process 121 according to IS0 4063) on steel. This part of IS0 9692 covers only the welding positions PA and PB according to IS0 6947. In case PC is used, special preparation will be necessary. It applies to fully penetrated welds. For partly penetrated welds, types of joint preparation, shapes and dimensions may differ from the listed proposals if they are specified in the relevant application standard or agreed by parties concerned. If the root is welded by a different arc welding process (see IS0 40631, the joint preparation according to IS0 9692 should be taken into account.