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
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[0007] Specific embodiment 1: This embodiment will be described with reference to Figs. 1 to 6. This embodiment is completed by the following steps: a. The steam turbine low-pressure heater tube plate 2 is made of 20MnMo or 16MnR alloy steel forgings with a thickness δ of 90-240mm. After processing, a first annular groove 2-1 is machined on one side of the connection between the steam turbine low-pressure heater tube sheet 2 and the water chamber 1, and the other is at the connection between the steam turbine low-pressure heater tube sheet 2 and the housing 3. A second annular groove 2-2 is machined on the side surface, the depth h1 of the first annular groove 2-1 and the depth h2 of the second annular groove 2-2 are both 20-30mm; b. The low pressure heater of the steam turbine The entire tube sheet 2 is preheated to 150-200°C, and then carbon steel is surfacing layer by layer in the first annular groove 2-1 and the second annular groove 2-2 of the steam turbine low-pressure heate...
Example Embodiment
[0008] Specific embodiment two: This embodiment is described with reference to FIG. 1. The difference between this embodiment and the specific embodiment 1 is: in step a of this embodiment, the steam turbine low pressure heater tube plate 2 is made of 20MnMo alloy steel with a thickness δ of 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 20-22 mm. The depth of the annular groove is very important to the welding quality. Too deep welding will increase the amount of welding and it is easy to cause deformation; too shallow, after finishing machining of the low pressure heater tube plate 2 of the steam turbine, the transition layer is too thin for the purpose of insulating heat. Considering the above factors, the depth of the two annular grooves is determined to be in the range of 20-22mm to ensure the welding quality.
Example Embodiment
[0009] Specific embodiment three: This embodiment is described with reference to Figs. 1 and 4. The difference between this embodiment and the first embodiment is: in step a of this embodiment, the steam turbine low-pressure heater tube plate 2 adopts a thickness δ of 200 mm 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 28-30 mm. Choosing the depth of the two annular grooves within the above range can ensure the welding quality of the steam turbine low-pressure heater tube plate 2 with the shell 3 and the water chamber 1.
[0010] Specific embodiment 4: This embodiment will be described with reference to Figs. 1 and 4. The difference between this embodiment and the first embodiment is: in step a of this embodiment, the steam turbine low-pressure heater tube plate 2 adopts a thickness δ of 92mm For a 16MnR alloy steel forging, the depth h1 of the first annular groove 2-1 and the depth h2 o...
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