Weld joint back face rotating type gas shield system

Abstract

The invention discloses a weld joint back face rotating type gas shield system, and relates to the technical field of welding. The system comprises a gas shield device, a locating mechanism and a drive device. The gas shield device comprises a back gas shield cover, a water cooling assembly and a gas shield assembly. The gas shield assembly is used for providing gas for the back gas shield cover.The water cooling assembly is used for providing cooling water for the back gas shield cover so as to cool the back gas shield cover and shielding gas at the same time. The locating mechanism comprises a support assembly and a power mechanism. A supporting leg assembly is movably arranged on the support assembly. The power mechanism is used for driving the supporting leg assembly to move so that the locating mechanism can be automatically centred to the axes of pipelines with the inner walls of the pipelines as the datum reference, and the power mechanism is used for guaranteeing that the backgas shield cover and the clearances of the inner walls of the pipelines are consistent in the circumferential direction. The drive device is used for driving the back gas shield cover to rotate. Thesystem is compact in structure, low in manufacturing cost and high in universality, shielding gas consumption is low in the welding process, and a good gas shield effect can be achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a rotary gas shielding system at the back of the weld. Background technique [0002] Back weld seam protection is required when welding high alloy, titanium and titanium alloy, nickel and nickel alloy pipes. Backside protection is a key factor in ensuring the quality of welded joints. Commonly used in engineering is the traditional back argon protection method, that is, argon is filled from one end of the pipe to the weld; the disadvantages of this method are obvious: (1) waste of gas (large amount of gas); (2) to inflate in advance, It takes a long time; (3) In the construction of long pipelines, soluble paper should be added to the inner welds to block the air, and the pipelines should be cleaned to remove them after welding. At present, there is also argon protection through the back gas protection cover. The back gas protection cover commonly used has the following disadva...

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