INTERNAL CLAMP DEVICE PROVIDED WITH CLEARANCE FILLING MEANS

• Main Authors: TAMAOKI HIROYUKI, KANAYAMA KIYOSHI, SAITO KAZUYUKI, KISHIDA HITOSHI
• Format: Patent
• Language: English
• Published: 29.07.1997
• Edition: 6
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

PROBLEM TO BE SOLVED: To provide a continuous back bead of uniform height which is generated on an inner wall part of a steel tube after welding by inserting a filling backing strap in a cavity formed between end parts of adjacent backing straps when the backing strap of an expanding means is abutted on the inner wall of the steel tube. SOLUTION: A second actuator 13 to slidably move a filling backing strap 12 in the tubular length direction of a steel tube 20, and a first actuator 14 to elevate/lower the filling backing strap 12 to an inner wall surface of the steel tube 20 are slidably moved to press the V-shaped cavity formed by a copper backing strap 2 and an adjacent copper backing strap 2 against the inner wall of the steel tube 20 by the filling backing strap 12. At the same time, the filling backing strap 12 loaded on a slide plate is slidable moved in the tubular length direction of the steel tube 20 by the first actuator 13 to fit a trapezoidal tip part of the filling backing strap 12 to the V-shaped cavity. The V-shaped cavity generated by the copper backing straps 2 is filled through a series of simultaneous actions.