Small-caliber straight pipe butt welding device

Abstract

The invention provides a small-caliber straight pipe butt welding device comprising a positioning core bar, a fastening nut, an end portion top cover and a protective gas transition pipe nozzle. One end of the positioning core bar or two ends of the positioning core bar are open, the middle of the positioning core bar is hollow, and an air hole is formed in the middle of the positioning core bar. The protective gas transition pipe nozzle is screwed at one opening end of the positioning core bar, and the other end of the positioning core bar is unopened or is selectively connected with a plug nut. The end portion top cover is sleeved on the positioning core bar, and a flange is arranged on the end portion top cover along the center direction of the positioning core bar. The positioning core bar, outside the end portion top cover, is provided with the fastening nut in a sleeved mode. The end portion top cover and the fastening nut are provided with air holes. By means of the small-caliber straight pipe butt welding device, assembly precision of a heat exchange pipe butt-joint connector, a heat exchange pipe and filler materials is controlled, inertia gas protection effectiveness on the inner wall of the connector is improved, and accordingly the fact that ultimate forming of connector welding seams meets manufacture requirements of products is guaranteed, and quality of a welding seam at the root portion of a butt-joint groove of the heat exchange pipe is guaranteed.

Description

technical field [0001] The invention relates to a butt welding device, in particular to a small diameter straight pipe butt welding device. Background technique [0002] In industrial production, it is often necessary to weld tubular equipment such as heat exchange tubes. In practice, various efforts have been made to achieve butt welding of tubular equipment and to ensure good welding quality. [0003] At present, many countries have joined in the research of the fourth-generation nuclear power technology mainly based on high-temperature gas-cooled reactors. The structure of the high-temperature gas-cooled reactor steam generator independently designed by my country is very different from the main equipment of the nuclear island of the previous pressurized water reactor and boiling water reactor, and there are many difficulties in manufacturing. The butt joint of small-diameter heat exchange tubes in steam generator internal parts is one of them, which has attracted the a...

AI Technical Summary

Problems solved by technology

However, the assembly accuracy of the nickel-based material heat exchange tube and the melting ring and the gas protection problem at the back of the weld inside the heat exchange tube have always been the main factors that restrict and affect the quality of the weld.

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