Welding tongs for connecting two abutting pipe ends by arc welding

US4698474A · kind A · utility

Assignee

• Kraftwerk Union Aktiengesellschaft · DE

Inventors

• Siegfried Gügel · Möhrendorf, DE
• Dieter Pellkofer · Herzogenaurach, DE
• Siegfried Forner · Erlangen, DE

Key dates

• Filing date: Apr 26, 1985
• Grant date: Oct 6, 1987
• Expiry date: Apr 26, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B23K9/0286
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Welding tongs for connecting two abutting pipe ends to each other by arc welding, includes two rigid jaws, a clamping device in the form of two symmetrical clamping jaws guided in the rigid jaws in radial direction of the surface of a pipe, the clamping jaws having contact surfaces adapted to the surface of a pipe for holding at least one pipe end, two angle levers each being connected to a respective one of the clamping jaws, a tie rod connected to the angle levers, a pair of levers connected to the tie rod and operating in vicinity of an extended position thereof, an operating handle connected to the pair of levers, a spring member biased between the clamping jaws and the pair of levers, a track, a welding electrode disposed on the track, and a motor connected to the electrode for moving the electrode along the track.