This document applies to types of joint preparation for submerged arc welding with one wire electrode (process 121 according to ISO 4063) on steel. This document covers only the welding positions PA and PB according to ISO 6947. If PC is used, special preparation is necessary. This document applies to fully penetrated welds. For partly penetrated welds, types of joint preparation, shapes and dimensions can differ from the listed proposals if they are specified in the relevant application standard or agreed by the parties concerned.