Automatic welding technology for nickel base alloy heat exchange pipe butt joint

Abstract

The invention discloses an automatic welding technology for nickel base alloy heat exchange pipe butt joint. The technology comprises the following steps that a heat exchange pipe I (1), a heat exchange pipe II (3) and a melting ring (2) are assembled; welding equipment is installed and debugged; and welding process parameters are set, and welding is conducted. According to the automatic welding technology for nickel base alloy heat exchange pipe butt joint, the heat exchange pipes are fixed in the mode that the axes are vertical, tools (7) are adopted to assemble the heat exchange pipes and the melting ring to guarantee coaxiality of the heat exchange pipes and the melting ring; and a welding machine head of the welding equipment is matched with the tools (7) for clamping, the positions of a tungsten electrode and the melting ring are controlled, and automatic welding is conducted according to the set welding parameters and the operation requirements. The welding technology is stable in welding process and is implemented in small space with the minimum pipe wall interval being 41 mm, the quality of butt joint welding lines between the nickel base alloy heat exchange pipes can be effectively controlled, the situation that the double sides of the formed welding lines between the nickel base alloy heat exchange pipes do not sink can be controlled, meanwhile, the double sides of the formed welding lines do not exceed the surfaces of the heat exchange pipes by 0.45 mm, the magnitude of the pigging diameter phi is guaranteed, and the property of a heat exchange pipe butt joint connector meets the product requirements.

Description

technical field [0001] The invention relates to an automatic butt joint welding process of nickel-based alloy heat exchange tubes of heat exchanger pressure vessel equipment, in particular to a nuclear power heat exchange main equipment, especially those represented by high-temperature gas-cooled reactors and fast neutron reactors. The butt joint automatic welding process of the nickel-based alloy heat exchange tube of the steam generator of the fourth generation nuclear power technology. Background technique [0002] The high-temperature section of the high-temperature gas-cooled reactor steam generator independently designed by my country and the outlet connecting pipe of the space elbow are connected by nickel-based alloy Incoloy800H heat exchange tubes. The specification of the heat exchange tube is 19mm in outer diameter and 3mm in wall thickness, which is small in diameter and large in wall thickness. [0003] According to the design requirements of the steam generato...

AI Technical Summary

Problems solved by technology

The welding process not only needs to ensure that the butt welds of the heat exchange tubes are well fused, but also control the two sides of the welds not to be sunken, and at the same time not exceed the surface of the heat exchange tubes by 0.45mm, and ensure that the φ of the ball is not less than 12.1mm. Tubes are extremely difficult to weld

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