Tack welding pipe sections for accurate location - using inserts to form tacks away from the root of the weld gap

摘要

Process and device for tack welding pipe sections for the accurate locations of two sections prior to welding. The novelty is that inserts are used at several places along the welding gap between the edges of the two sections which usually have V-chamfers, the inserts being used to form fusion weld bridges away from the root of the weld, the root being shielded by the inserts during the tack welding. The insert may be (a) a shaped, heat resisting ceramic contg. a trough used to form the weld bridge with an electrode; or (b) made of the same material as the pipe sections, but with a web used to knock the insert out of the gap. Wide application e.g. joining two pipe sections, elbows, flanges etc. e.g. joining two pipe sections, elbows, flanges etc. e.g. in power stations or other industrial use. The tack weld does not extend to the root so that good quality welds are obtd. and it is not necessary to grind bore of the pipe-joint.