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An electron beam welding method for an ultra-supercritical partition

An electron beam welding and ultra-supercritical technology, which is applied in the field of steam turbines, can solve the problems of difficulty in ensuring welding quality, difficulty in welding seam cleaning, and difficulty in welding seam forming, and achieves the advantages of less difficulty in welding, reducing the probability of repairing, and improving welding quality. Effect

Active Publication Date: 2011-12-28
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 a method for electron beam welding of ultra-supercritical diaphragms to solve the problem of welding of ultra-supercritical diaphragms. Manual welding or gas-shielded welding has difficulties in forming welds, large welding deformation, and cleaning of welds. Difficulties, welding quality is difficult to guarantee and other issues

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  • An electron beam welding method for an ultra-supercritical partition
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  • An electron beam welding method for an ultra-supercritical partition

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specific Embodiment approach 1

[0018] Specific implementation mode one: combine Figure 1 ~ Figure 3 Illustrate, a kind of electron beam welding method of ultra-supercritical separator of the present embodiment, described method is realized according to the following steps:

[0019] Step 1. Marking: draw the horizontal mid-section line on the inner plate body 3, the outer plate body 2 and the tooling (according to the design requirements), and draw the horizontal mid-section line on the first guide vane and the end guide vane (The scribe line should be clear) and make a hole in the corresponding position for observation (the corresponding position refers to the drawn horizontal mid-plane line, punch the hole on the line, so that the trace is clear and easy to observe during electron beam welding, otherwise the scribe line not visible while in the welder);

[0020] Step 2. Assembly: According to the line drawn in step 1, assemble the outer plate body 2 on the tooling, and use the outer plate body 2 as the p...

specific Embodiment approach 2

[0035] Specific embodiment two: in step six of the present embodiment, the accelerating voltage during preheating is 55KV, the welding speed is 800mm / min, the electron beam current is 50mA, the focusing current is 1550mA, and the scanning swing of the electron beam in the X direction is 0, the scanning swing of the electron beam in the Y direction is 0, and the gun distance is 320mm;

[0036]The accelerating voltage during sealing welding is 55KV, the welding speed is 250mm / min, the electron beam current is 85mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 0, and the scanning swing of the electron beam in the Y direction is 0 , the gun distance is 320mm;

[0037] The accelerating voltage during welding is 55KV, the welding speed is 250mm / min, the electron beam current is 210mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 0, and the scanning swing of the electron beam in the Y di...

specific Embodiment approach 3

[0040] Specific embodiment three: the accelerating voltage during the preheating in step six of the present embodiment is 55KV, welding speed is 400mm / min, electron beam current is 80mA, focusing current is 1550mA, and the scanning swing of electron beam in X direction is 0, the scanning swing of the electron beam in the Y direction is 0, and the gun distance is 320mm;

[0041] The accelerating voltage during sealing welding is 55KV, the welding speed is 300mm / min, the electron beam current is 85mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 0, and the scanning swing of the electron beam in the Y direction is 0 , the gun distance is 320mm;

[0042] The accelerating voltage during welding is 55KV, the welding speed is 250mm / min, the electron beam current is 210mA, the focusing current is 1850mA, the scanning swing of the electron beam in the X direction is 0, and the scanning swing of the electron beam in the Y direction is 0. ...

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Abstract

The invention discloses an electron beam welding method for ultra supercritical partition plates, and relates to a welding method for ultra supercritical partition plates for solving the problems of difficulty in welded seam formation, high welding deformation, difficulty in clearing seams, difficulty in ensuring the welding quality and the like in a manual welding or gas protection welding process during welding the ultra supercritical partition plates. The method comprises the following steps of: ruling, assembling, checking, spot welding, vacuumizing, welding seams, turnover welding, checking, and performing thermal treatment. In the seam welding step, the accelerating voltage is 55 to 60kV, the welding speed is 200 to 800mm / min, the electron beam current is 50 to 350mA, the focusing current is 1,500 to 2,000mA, the scanning oscillation amplitude of electron beams in the X direction is 0 to 5.4, the scanning oscillation amplitude of the electron beams in the Y direction is 0 to 6.0, the gun distance is 220 to 320 millimeters, and the scanning waveform is circular. The method is used for electron beam welding of the ultra supercritical partition plates of a steam turbine.

Description

technical field [0001] The invention relates to an ultra-supercritical diaphragm welding method, which belongs to the technical field of steam turbines. Background technique [0002] The diaphragm of the steam turbine adopts a welded structure, and the function of welding is to connect the guide vane with the inner and outer plates to form a whole, so as to achieve 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 the manufacture of steam turbines, which directly affects the production cycle and product quality of steam turbines. For ultra-supercritical separators, the structure is more complex, the thickness is larger (the thickness is in the range of 80-170mm), and the precision requirements are higher. Manual welding or gas shielded welding is used because welding grooves are required, and the gr...

Claims

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Application Information

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IPC IPC(8): B23K15/06B23K15/00
Inventor 杨浩刘长江太秀滨董生权沈阳威付强王超李全华宫在龙王金刚
Owner HARBIN TURBINE
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