Internal line up clamp

Details Internal line up clamp Internal line up clamp

1994-04-21

1996-07-16

Ramsey, Kenneth J.

Metal fusion bonding

Process

With clamping or holding

228 493, 269 481, 269266, B23K 37053

Patent

active

055359388

ABSTRACT:
An improved internal line up clamp (10) is disclosed which has an integral back up ring (12). A first set of pipe clamps (22) move radially outward to engage the inner surface of a first pipe (14). A second set of pipe clamps (62) and a set of back up ring segments (202) are simultaneously moved radially outward into engagement with the inner surface of the pipes. The back up ring segments (202) are spring loaded to exert a relatively constant back up force against the inner surface of the pipes at the weld. The back up ring segments support the shoe elements (220). The shoe elements are spring loaded to accommodate diameter mismatch and non-circularity of the pipe ends. The back up ring segments rotate about a radial axis from the pipe centerline. Tapered ends on the back up ring segments provide for the decrease in ring circumference necessary to lower the ring segments.

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