Long seam welding and post-weld heat treatment process for high-alloy heat-resistant steel pipe screen

A post-weld heat treatment and alloy steel pipe technology, which is applied in heat treatment furnaces, heat treatment equipment, heat treatment process control, etc., can solve the problems of poor heat treatment effect, unstable support frame, and low construction efficiency, so as to shorten the construction period and ensure Effect of heat treatment, effect of improving construction efficiency

Active Publication Date: 2019-03-15
POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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Problems solved by technology

[0003] Use the existing method for post-weld heat treatment of long high-alloy steel seams. Generally, one section of welding is heat-treated for one section, or the weld seam is heat-treated at the same time after welding a piece of seam. Usually, the support frame is not firmly fixed, the heat treatment effect is not good, and the construction Problems of low efficiency and easy deformation of tube screen

Method used

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  • Long seam welding and post-weld heat treatment process for high-alloy heat-resistant steel pipe screen
  • Long seam welding and post-weld heat treatment process for high-alloy heat-resistant steel pipe screen
  • Long seam welding and post-weld heat treatment process for high-alloy heat-resistant steel pipe screen

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Embodiment Construction

[0022] Attached below Figure 1-3 And the specific examples further describe the present invention in detail.

[0023] Such as figure 2 As shown, two longer-sized tube screens 7 are spliced, and there are long joints 8 of tube screens distributed in the direction of elongation at the splicing place, such as figure 1 As shown, the long joint 8 of the tube panel is divided into 7 sections of equal length, and numbered 1 to 7. When the long joint 8 of the tube panel is welded, firstly, it starts from the joint of the No. The joints of No. 1, 3, 5 and 7 tube screens are welded sequentially by skip welding at intervals.

[0024] After each section of welding is completed, a heater 5 and a thermal insulation cotton 6 located on the outer surface of the heater 5 are arranged above and below the upper surface of the No. A fixing device for fixing the heater and the insulation cotton is fixedly connected on the outer surface.

[0025] Such as image 3 As shown, the fixing device ...

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Abstract

In order to solve the problems of poor effect, low construction efficiency, and easy-deformation of a pipe screen in the long seam welding and heat treatment of the tube screen, a long seam welding and post-weld heat treatment process for the high-alloy heat-resistant steel pipe screen is provided. The welding and heat treatment of the long seam of the pipe screen are mainly carried out by adopting the methods of subsection interval skip welding and heat treatment and subsection ladder heat treatment, thereby avoiding the simultaneous heating and cooling of the long seam of the pipe screen, reducing the deformation rate of the seam of the pipe screen, and greatly improving the construction efficiency at the same time.

Description

technical field [0001] The invention relates to the technical field of steel pipe welding, in particular to a high-alloy heat-resistant steel pipe screen-length seam welding and post-weld heat treatment process. Background technique [0002] In recent years, the number of power stations of circulating fluidized bed boilers has increased. SA-387GR91 high-alloy heat-resistant steel is widely used in the fins of the heating surface tube panel. The long joint between the two tube panels (size 11900mm) SA-387GR91 Heat treatment is required after welding. At present, the traditional post-weld heat treatment methods on site: electric heating and flame heating. For high-alloy steel, electric heating must be used to achieve the temperature required by the standard and uniform heating. For high-alloy steel with long tailor-made seam, the difficulty of post-weld heat treatment lies in the heater. Fixing, currently the most commonly used fixing method is to cover the crawler heater and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/02B23K37/00C21D9/50C21D11/00
CPCB23K31/02B23K37/00C21D9/50C21D11/00
Inventor 张延涛苗慧霞史小猛张立祥刘立龙
Owner POWERCHINA SEPCO1 ELECTRIC POWER CONSTR CO LTD
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