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Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction

A low-pressure heater and steam turbine technology, applied in heat treatment furnaces, heat treatment equipment, machines/engines, etc., can solve problems such as poor heat treatment effect, low production efficiency, and difficult processing, and achieve easy welding operations, improved production efficiency, and reduced The effect of welding process difficulty

Active Publication Date: 2007-07-18
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method of surfacing welding for the connection between the low-pressure heater tube plate of the steam turbine and the shell and the water chamber, which can solve the problem that the low-carbon steel steam turbine low-pressure heater tube plate is welded to the shell and the water chamber. Problems of complex process, difficult processing, low production efficiency and problems of difficult operation and poor heat treatment effect when alloy steel steam turbine low-pressure heater tube plate is directly welded to the shell and water chamber

Method used

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  • Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction
  • Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction
  • Pile-up welding method of turbine low pressure heater pipe plate and shell, water chamber junction

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specific Embodiment approach 1

[0007] Specific embodiment one: this embodiment is described in conjunction with Fig. 1~Fig. 6, and this embodiment is completed by the following steps: a, steam turbine low-pressure heater tube plate 2 adopts the 20MnMo or 16MnR alloy steel forging that thickness δ is 90~240mm, through rough After processing, a first annular groove 2-1 is processed on one side of the connection between the tube plate 2 of the steam turbine low-pressure heater and the water chamber 1, and a first annular groove 2-1 is processed on the other side of the connection between the tube plate 2 of the low-pressure heater of the steam turbine and the casing 3. A second annular groove 2-2 is processed on the side surface, and the depth h1 of the first annular groove 2-1 and the depth h2 of the second annular groove 2-2 are both 20 to 30 mm; b, the steam turbine low-pressure heater The tube sheet 2 is preheated to 150-200°C as a whole, and then carbon steel is surfacing layer by layer in the first annula...

specific Embodiment approach 2

[0008] Specific embodiment two: this embodiment is described in conjunction with Fig. 1, the difference between this embodiment and specific embodiment one is: in step a of this embodiment, the steam turbine low-pressure heater tube plate 2 adopts 20MnMo alloy steel whose thickness δ is 100mm For the forging, the depth h1 of the first annular groove 2-1 and the depth h2 of the second annular groove 2-2 are both 20-22mm. The depth of the annular groove is very important to the welding quality. If it is too deep, the amount of welding will increase and it will easily cause deformation; if it is too shallow, after the tube plate 2 of the steam turbine low-pressure heater is finished, the transition layer is too thin to achieve the purpose of heat insulation. Considering the above factors, it is determined that the depth of the two annular grooves is within the range of 20-22mm, which can ensure the welding quality.

specific Embodiment approach 3

[0009] Specific embodiment three: This embodiment is described in conjunction with Fig. 1 and Fig. 4, and the difference between this embodiment and specific embodiment one is: in step a of this embodiment, the steam turbine low-pressure heater tube plate 2 adopts a tube plate with a thickness δ of 200mm. For the 20MnMo alloy steel forging, the depth h1 of the first annular groove 2-1 and the depth h2 of the second annular groove 2-2 are both 28-30mm. The depth of the two annular grooves is selected within the above range, which can ensure the welding quality of the tube plate 2 of the low-pressure heater of the steam turbine, the casing 3 and the water chamber 1 .

[0010] Embodiment 4: This embodiment is described in conjunction with Fig. 1 and Fig. 4. The difference between this embodiment and Embodiment 1 is that in step a of this embodiment, the steam turbine low-pressure heater tube plate 2 adopts a tube plate with a thickness δ of 92mm. For a 16MnR alloy steel forging, ...

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Abstract

The present invention relates to a surfacing method of turbine low-pressure heater tube-plate and shell body and water chamber connection position, belonging to a welding method of turbine low-pressure heater tube-plate and connection component. Said surfacing method is characterized by adopting the following steps: adopting 20MnMo or 16MnR alloy steel forged piece whose thickness is 90-240 mm as turbine low-pressure heater tube-plate; making two ring recessed grooves on said forged piece, the depth of every ring recessed groove is 20-30 mm; preheating and layer-by-layer surfacing carbon steel in two ring recessed grooves, the bead interlayer temperature is 100-150 deg.C, after the surfacing operation is completed, covering with ashestos cloth, cooling to normal temperature, making postweld heat treatment, tempering temperature is 600-630 deg.C and tempering for 10-25 h.

Description

technical field [0001] The invention relates to a welding method for a steam turbine low-pressure heater tube plate and a connecting piece. Background technique [0002] Existing steam turbine low-pressure heater tube sheets are usually made of low-carbon steel. Due to the mechanical properties of low-carbon steel, steam turbine low-pressure heater tube sheets need to use thicker plates. When the tube plate of the steam turbine low-pressure heater is welded to the shell and water chamber, preheating and post-weld heat treatment are required to ensure the welding quality. Due to the large volume and weight of the tube sheet of the low-pressure heater of the steam turbine, there are problems in the process of processing, such as complex process, high processing difficulty and low production efficiency. If the tube plate of the low-pressure heater of the steam turbine is made of alloy steel and welded directly to the shell and the water chamber, the operation is very difficult...

Claims

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Application Information

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IPC IPC(8): B23K9/04B23K9/095B23K9/235B23K33/00C21D9/50C21D11/00F01D25/10
Inventor 徐涛程世范杨镇海刘克为王景尧武君王芹
Owner HARBIN TURBINE
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