Fixture for clamping rings to be welded in bore - has ring held concentric in bore by brace with radially adjustable legs

摘要

The fixture is used to position weld rings (9) which are to be welded one above the other in the ground-out aperture D2 through the wall (1) of a boiler. The fixture consists of a star-shaped brace (5) with three radially adjustable legs (6) and a central rod (12) that can be screwed through a threaded hole (10) in the brace. The weld ring (9) is seated centrally against shoulders (8) on the legs of the brace, which is then lowered into the aperture. The end of the rod (12) locates in the clamp (11) for the base ring (14) at the junction between the boiler wall and pipe connection (4). With the weld ring centred and abutting against the base ring, it can be welded to the aperture wall from above through the spaces between the legs. ADVANTAGE - Rings are accurately located even with inexact grinding out of bore. Expensive rework is avoided. Simple design, easy to use.