Snakelike high-pressure heater collection pipe and extension section inner side butt joint automatic welding process
A high-pressure heater and extension technology, applied in metal processing equipment, manufacturing tools, welding rod characteristics, etc., can solve the problems of difficult welding of thick-walled welds, difficult welding process, and small internal space, so as to reduce welder injuries. risk, saving working time and reducing labor intensity
Inactive Publication Date: 2019-02-19
SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD
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- Abstract
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- Application Information
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Problems solved by technology
[0008] The problems to be solved by the present invention are: the welding process between the manifold of the existing snake-shaped high-pressure heater and the inner side of the extension section is difficult, the internal space is narrow and difficult to operate, and the welding of thick-walled weld seams is difficult to implement after preheating
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Embodiment
[0024] An automatic welding process for the inner butt joint of the serpentine high-pressure heater header and the extension section:
[0025] Step 1: The welding seam 5 between the header 1 and the extension section 2 adopts a narrow gap internal groove structure (such as image 3 As shown), the header 1 and the extension section 2 are assembled and positioned in the vertical direction and fixed;
[0026] Step 2: If figure 2 As shown, fix the frame 6-1 of the automatic welding equipment 6 (model SPX welding head&Narrow Gap torche8-200-OSC-128-1C), and adjust the concentricity through the 6-1-1 adjustment knob in the frame 6-1 Adjust so that the center position of the welding head 6-2 is located at the center of the connection. Use the 6-1-2 adjustment knob in the frame 6-1 to adjust the flatness, make the welding torch 6-3 parallel to the groove surface at the welding seam 5, preheat the header 1 and the extension section 2, and then readjust Concentricity and flatness; t...
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Abstract
The invention discloses a snakelike high-pressure heater collection pipe and extension section inner side butt joint automatic welding process. A welded joint between a collection pipe and an extension section is of a narrow-gap inside-groove structure. After assembled and located, the collection pipe and the extension section are in the vertical direction and are fixed. A rack of automatic welding equipment is fixed, the plane of a welding machine head is adjusted, thereby being kept parallel to the groove face at the welded joint, and the flatness is adjusted again after the collection pipeand the extension section are preheated. The welding machine head stretches into the extension section from top to bottom, a welding gun on the welding machine head transversely stretches into the root of the narrow-gap inside-groove structure. The welding gun rotates automatically, filling wire automatic argon arc welding is conducted, and after one circle is completed, operation is repeated tillwelding of the whole welded joint is completed. Compared with existing manual welding, the snakelike high-pressure heater collection pipe and extension section inner side butt joint automatic weldingprocess greatly lowers labor intensity and injury risk of a welder. A groove of manual welding is large, a groove of a narrow gap is very small, and thus work time is saved significantly. In addition, welding quality is stable and reliable, and one-time qualification is achieved during nondestructive testing.
Description
technical field [0001] The invention relates to an automatic butt joint welding process between a header pipe of a serpentine high-pressure heater and the inner side of an extension section, and belongs to the technical field of containers, heat exchangers or power station equipment. Background technique [0002] With the continuous development and progress of society, thermal power generating units are constantly developing in the direction of high parameters and large capacity. In domestic large-scale units, the high-pressure heater generally adopts a tube-sheet U-shaped tube structure, but this usually requires a larger tube-sheet diameter and thickness, and the start-up and shutdown of the unit will generate greater thermal stress, causing the shell and tube-sheet connection risk of cracks. [0003] However, if the high-pressure heater adopts a serpentine tube structure, it can solve the problem of the increasing thickness of the tube plate of the U-shaped tube heater, ...
Claims
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IPC IPC(8): B23K9/167B23K9/028B23K9/28
CPCB23K9/0282B23K9/167B23K9/28
Inventor 许庆和郭伟杰竺凌冯莉明王秉权
Owner SHANGHAI ELECTRIC POWER GENERATION EQUIPMENT CO LTD