Inner round supporting device of heat exchanger header and welding method of heat exchanger header
A welding method and heat exchanger technology, applied in the field of nuclear power, can solve problems such as difficult to dismantle directly, high linear expansion coefficient of stainless steel material, large shrinkage stress, etc., and achieve the effect of remarkable roundness, low cost, and light use
Active Publication Date: 2022-02-11
HEBEI UNIV OF ENVIRONMENTAL ENG +2
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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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[0099] Select 273 × 5 mm thin-walled stainless steel seamless steel pipe, a C-shaped cylinder having a gas cutting forming length of 2200 mm, wherein the design width at the C-shaped cylinder is 180 mm, which is 1,70 to 175 mm, and the inner diameter of the C-shaped cylinder is measured 253 ~ 258mm,
[0100] Install the inner support device in the C-shaped tube near the spherical head, such as figure 1 and image 3 As shown in the middle, the upper arc plate and the lower arc plate are hinged, the upper arc plate and the lower arcuate plate are contracted on the inner wall of the C-shaped cylinder, and there is provided between the upper arc-shaped plate and the lower arcuate plate. The support rod adjusts the length of the support rod by rotating the rod on the support rod, thereby returning the inner diameter size of the C-shaped cylinder to 263 mm;
[0101] Adjust the relative position of the tube plate and the C port, and weld the tube board.
[0102] After the welding is compl...
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Abstract
The invention discloses a device for rounding the inside of a heat exchanger header and a welding method for the heat exchanger header. The device includes two arc-shaped plates for internally supporting the heat exchanger header, and the two arcs One end of the shaped plate is hinged, and the other end is supported by a support rod; one end of the support rod is hinged to one arc-shaped plate, and the other end is in contact with another arc-shaped plate. After the spot welding or complete welding of the head is completed, the support The abutment between the rod and the arc-shaped plate is misaligned, so that the two arc-shaped plates are separated from the inner wall of the heat exchanger header and taken out from the heat exchanger header.
Description
Technical field [0001] The present invention relates to a processing auxiliary tooling of a core domain heat exchanger and a welding method of the heat exchanger joint. Background technique [0002] The heat exchanger is widely used in chemical, petroleum, nuclear energy and other industrial sectors, and is a pressure vessel conversion through heat transfer to power, and there is a wide variety of heat exchange structures. For example, a plate heat exchanger is a common heat exchanger, and the heat exchange portion is composed of four sets of union and heat exchange tubes, each with a cylindrical structure, a tube plate, a C-column cylinder, and Spherical head welding composition. [0003] A heat exchanger with an outer diameter of 273 mm, a wall thickness of 5 mm, a length of 2200 mm is required in the nuclear power field. All welded grooves are outside grooves due to their specifications and structures. Its manufacturing process is: the upper tube plate and the C-shaped cylinde...
Claims
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IPC IPC(8): B23K31/02B23K37/00
CPCB23K31/02B23K37/00
Inventor 王楚鑫王健王譞张洪亮孙旭瑶
Owner HEBEI UNIV OF ENVIRONMENTAL ENG