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Electron beam welding method for large-thickness diaphragms of steam turbines

A technology of electron beam welding and large thickness, applied in electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of difficult to guarantee welding quality, difficult welding seam forming, and difficult welding seam cleaning, and improve welding quality. , the effect of poor working conditions and reducing the probability of repair

Active Publication Date: 2013-07-17
HARBIN TURBINE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an electron beam welding method for large-thickness separators of steam turbines, so as to solve the problem of welding seams with manual welding or gas-shielded welding. Difficult, the problem that the welding quality is difficult to guarantee

Method used

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  • Electron beam welding method for large-thickness diaphragms of steam turbines

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specific Embodiment approach 1

[0015] Specific implementation mode one: combine figure 1 and figure 2 Describe this embodiment, the method of this embodiment comprises the following steps:

[0016] Step 1. Marking line: draw the horizontal middle surface line on the inner plate body 2, outer plate body 3, inner peripheral belt 4, outer belt 5 and tooling (according to the design requirements), and draw a horizontal line on the guide vane 1 at the same time. The middle surface line (marked line should be clear) and drill holes in the corresponding position for observation; (the corresponding position refers to the drawn horizontal middle surface line, punching holes on the line, so that the traces are clear, and it is convenient for electron beam welding Observe, otherwise the scribe line will not be seen when welding)

[0017] Step 2. Assembly: According to the line drawn in step 1, assemble the cascade (the cascade is composed of guide vane 1, inner band 4, and outer band 5, and assemble and weld guide ...

specific Embodiment approach 2

[0026] Specific implementation mode two: combination figure 1 Describe this embodiment, in step 6 of this embodiment, the accelerating voltage during preheating is 55KV, welding speed is 300mm / min, electron beam current is 60mA, focusing current is 1550mA, and the scanning swing of electron beam in X direction is 1.8, the scanning swing of the electron beam in the Y direction is 2.0, and the gun distance is 320mm;

[0027] The accelerating voltage during sealing welding is 55KV, the welding speed is 250mm / min, the electron beam current is 100mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 1.8, and the scanning swing of the electron beam in the Y direction is 2.0 , the gun distance is 320mm;

[0028] When welding the inner circle, the accelerating voltage is 55KV, the welding speed is 150mm / min, the electron beam current is 380mA, the focusing current is 1800mA, the scanning swing of the electron beam in the X direction is 0, a...

specific Embodiment approach 3

[0032]Specific embodiment three: in step six of the present embodiment, the accelerating voltage during preheating is 55KV, the welding speed is 400mm / min, the electron beam current is 80mA, the focusing current is 1550mA, and the scanning swing of the electron beam in the X direction is 3.6, the scanning swing of the electron beam in the Y direction is 4.0, and the gun distance is 320mm;

[0033] The accelerating voltage during sealing welding is 55KV, the welding speed is 300mm / min, the electron beam current is 190mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 1.8, and the scanning swing of the electron beam in the Y direction is 2.0 , the gun distance is 320mm;

[0034] When welding the inner circle, the accelerating voltage is 55KV, the welding speed is 150mm / min, the electron beam current is 380mA, the focusing current is 1800mA, the scanning swing of the electron beam in the X direction is 0, and the scanning swing of th...

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Abstract

An electron beam welding method for large-thickness diaphragms of steam turbines relates to an electron beam welding method. The invention is aimed at the problems of current manual welding or gas-shielded welding or other techniques for welding large-thickness diaphragms that: the formation of welds is difficult, welding deformation is severe, weld clearing is difficult, and welding quality is hard to guarantee. The method includes the following steps: marking, assembly, check, spot welding, vacuumization, welding, reverse welding, check and heat treatment. The method is used for welding large-thickness diaphragms of steam turbines.

Description

technical field [0001] The invention relates to an electron beam welding method. Background technique [0002] The steam turbine diaphragm adopts a welded structure, and the weld seam connects the cascade (blade and shroud connection) with the inner plate and outer plate to form a whole, thereby achieving the purpose of eliminating vibration and reducing steam leakage. The number of diaphragms in each steam turbine is large and the manufacturing process is complicated. Therefore, diaphragm welding has always been a key process in steam turbine manufacturing, which directly affects the production cycle and product quality of steam turbines. For the directly welded diaphragm between the cascade and the plate body, its structural form is more complex, the thickness is larger (120-170mm), and the precision requirements are higher. The width of the mouth is large, and the welding seam is difficult to form, the welding deformation is large, the welding seam cleaning is difficult,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/06
Inventor 杨浩太秀滨刘长江董生权沈阳威王超付强宫在龙李全华戚金业
Owner HARBIN TURBINE
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