Filling-material-free low-alloy steel heat-exchange pipe butt-joint automatic welding technique

Abstract

The invention provides a low-alloy steel heat-exchange pipe butt-joint automatic welding technique. The technique comprises the following steps that a first heat exchange pipe (1) and a second heat exchange pipe (2) are assembled; welding equipment is mounted and debugged; and welding technological parameters are arranged, and welding treatment is conducted. The low-alloy steel heat-exchange pipe butt-joint automatic welding technique is free of a filling material, a tool (7) is adopted for assembly of the heat exchange pipes, and the coaxial effect is ensured; and a welding machine head and the tool (7) are matched for clamping, and the positions of a tungsten electrode and the heat exchange pipes are controlled; and according to the welding parameters and the operating requirements of the technique, the rotation center of the welding machine head drives the tungsten electrode to rotate to conduct self-melting automatic welding, the welding process is stable, the welding seam quality and welding seam forming can be effectively controlled, and the performance of a heat exchange pipe butt-joint connector meet the requirement of a product.

Description

technical field [0001] The invention relates to an automatic butt joint welding process of low-alloy steel heat exchange tubes for 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 automatic butt welding process of the low alloy steel heat exchange tubes of the steam generator of the fourth generation nuclear power technology. Background technique [0002] The low-alloy steel SA-213T22 heat exchange tube is connected between the low-temperature section of the spiral coil tube of the high-temperature gas-cooled reactor steam generator independently designed by my country and the water supply connection pipe of the space elbow. The specification of the heat exchange tube is 19mm in outer diameter and 3mm in wall thickness. The diameter is small and the wall thickness is large. According to the design requirements of the stea...

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Problems solved by technology

[0003] It is worth noting that the heat exchange tubes of steam generators such as high-temperature gas-cooled reactors are densely packed, the distance between the tube walls between the heat exchange tubes is small, and the welding operation space is small, which further increases the difficulty of welding operations, such as laser welding or laser-like welding. None of the welding techniques can be applied to the butt welding of heat exchange tubes on steam generators such as high temperature gas-cooled reactors

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