Heat exchanger header inner side supporting rounding device and heat exchanger header welding method

Abstract

The invention discloses a heat exchanger header inner side supporting rounding device and a heat exchanger header welding method. The device includes two arc plates used for internally supporting a heat exchanger header, one ends of the two arc plates are hinged, and the other ends of the two arc plates are supported by a supporting rod; and one end of the supporting rod is hinged with one arc plate, the other end of the supporting rod abuts against the other one arc plate, after sealing head point welding is completed or complete welding is completed, then abut joint positions between the supporting rod and the arc plates are misalulted, so that the two arc plates are separated from the inner wall of the heat exchanger header and removed from the heat exchanger header.

Description

technical field [0001] The invention relates to a processing auxiliary tooling for a heat exchanger header in the field of nuclear power and a welding method for the heat exchanger header. Background technique [0002] Heat exchangers are widely used in chemical, petroleum, nuclear energy and other industrial fields. They are pressure vessels that convert heat into power through heat transfer. There are various types of heat exchange structures. For example, a plate heat exchanger is a common heat exchanger. Its heat exchange part is composed of four sets of headers and heat exchange tubes. The spherical head is welded. [0003] In the field of nuclear power, a heat exchanger header with an outer diameter of 273 mm, a wall thickness of 5 mm and a length of 2200 mm is required. Due to the limitation of its specification and structure, all welding grooves are outer grooves. Its manufacturing process is as follows: the upper tube plate and the C-shaped cylinder are welded in...

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Problems solved by technology

[0004] According to the analysis of the above process requirements, the following problems will exist in the butt welding of the tube plate and the C-shaped cylinder: 1. There is internal stress in the cold drawing forming process of the seamless stainless steel pipe, and it will shrink inward after cutting. In order to ensure the butt joint with the tube plate When the wrong side is assembled, it is necessary to use a crowbar, a top wire support, etc. to adjust the butt joint wrong side. This method of locally applying external force will affect the roundness of the C-shaped cylinder; 2. Due to the high linear expansion coefficient of the stainless steel material, the resistance High rate, low thermal conductivity, large welding deformation

[0006] However, for a slender heat exchanger header with an outer diameter of 273mm, a thickness of 5mm, and a length of 2200mm, due to its small wall thickness, the shrinkage stress is large, that is, the deformation is large, and the compression of the inner wall to the round tooling To a greater extent, it is difficult to remove the tooling directly after welding, and it needs to be removed by destructive methods such as cutting

However, due to the long length and small inner diameter of the heat exchanger header, the tooling is installed at the head end of the C-shaped cylinder. After the head is docked, personnel will not be able to touch and dismantle it, so it is difficult to achieve inner support according to the above method. round

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