Low-alloy steel heat exchange pipe butt joint automatic welding process for filling molten rings

Abstract

The invention discloses a low-alloy steel heat exchange pipe butt joint automatic welding process. The process adopts the molten rings machined by IN521 materials as filling materials for butt joint of low-alloy steel heat exchange pipes; the axles of a heat exchange pipe I (1) and a heat exchange pipe II (3) are vertically fixed; a tool (7) is adopted to assemble the heat exchange pipes and the molten rings (2) to guarantee coaxiality; a welding machine head is matched and clamped with the tool (7) to control the positions of a tungsten electrode and the molten rings (2); and according to welding parameters and operation requirements of the process, a rotating center of the welding machine head drives the tungsten electrode to rotate around the molten rings (2) for automatic welding. The welding process is stable in welding process, and can effectively control the welding line quality and the welding line formation; and the performances of joints for heat exchange pipe butt joint meet the product requirements.

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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