Apparatus and methods for use in aligning and welding in end-to-end relation a pair of members such as pipe sections or a cylindrical vessel and closure wall and wherein one of the members is subjected to a clamping force adjacent the end to be welded to produce a predetermined configuration at that...http://www.google.de/patents/US4356615?utm_source=gb-gplus-sharePatent US4356615 - Apparatus and methods for use in welding
