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Surfacing welding technology for large-area anti-corrosion layers of tube plate

A corrosion-resistant layer and large-area technology, which is applied in the direction of manufacturing tools, welding equipment, arc welding equipment, etc., can solve problems such as difficulty in meeting the welding standards of nuclear island equipment products, large welding residual stress in weld bead, and inconvenient transfer of workpieces, etc., to achieve Good fusion between layers, meeting welding quality requirements, and improving welding efficiency

Inactive Publication Date: 2016-04-13
HARBIN ELECTRIC CORP QINHUANGDAO HEAVY EQUIP
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Problems solved by technology

[0002] Tube-sheet surfacing is widely used in the production and manufacture of heat exchangers and other devices, especially in products such as passive waste heat discharge heat exchangers of nuclear island equipment, which are designed with large-area corrosion-resistant layer surfacing. For such welds, the main domestic The method of welding in the flat welding position after being rigidly fixed has the disadvantages of long preparation time before welding, inconvenient transfer of workpieces, large residual stress of weld bead welding, and long construction period; in addition, due to the thin thickness of the product tube plate, adopting When the conventional large heat input welding method is easy to cause welding deformation, it is difficult to meet the product welding standards of nuclear island equipment. Therefore, it is urgent to develop an automatic welding process suitable for it

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  • Surfacing welding technology for large-area anti-corrosion layers of tube plate

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Embodiment

[0051] According to the above-mentioned welding process provided by the present invention, the tube sheet of the main equipment heat exchanger of the nuclear island is surfacing with corrosion resistance, wherein the thickness of the tube sheet is 240 mm, and the material is SA-508Gr.3Cl.2. The specific welding process is as follows:

[0052]Step 1), install and position the tube sheet, use a grinding wheel to polish the surface of the part to be welded until smooth, then dip acetone with a white non-woven cloth to wipe the part to be welded until the non-woven cloth does not change color;

[0053] Step 2), install, debug, and inspect the welding equipment of the EASB welding manipulator, and input the welding process parameters: the average welding current is 650-900A, the welding voltage is 25-32V, the welding speed is 140-190mm / min, during the welding process The preheating temperature and interlayer temperature are ≤177°C, the welding position is flat welding, and the EQNiC...

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Abstract

The invention discloses a surfacing welding technology for large-area anti-corrosion layers of a tube plate. The technology includes the steps that the tube plate is assembled and positioned, and the portion to-be-welded is cleared; welding equipment is installed and debugged, and welding technological parameters are input; straight welding pass surfacing welding is carried out at the primary side of the tube plate, after one layer is formed through surfacing welding, the tube plate is turned over by 180 degrees, and straight welding pass surfacing welding is carried out at the secondary side of the tube plate; welding operation is repeated until the anti-corrosion layers of the specific thickness are formed at the two sides of the tube plate. According to the welding technology, the deformation of the tube plate can be as low as 1 mm or below after the welding technology is completed, the welding process is stable, weld joints are formed uniformly, fusion between layer passes is good, and the requirement for welding quality of nuclear island main equipment can be met.

Description

technical field [0001] The invention relates to a tube plate welding process, in particular to a tube plate large-area corrosion-resistant overlay welding process. Background technique [0002] Tube-sheet surfacing is widely used in the production and manufacture of heat exchangers and other devices, especially in products such as passive waste heat discharge heat exchangers of nuclear island equipment, which are designed with large-area corrosion-resistant layer surfacing. For such welds, the main domestic The method of welding in the flat welding position after being rigidly fixed has the disadvantages of long preparation time before welding, inconvenient transfer of workpieces, large residual stress of weld bead welding, and long construction period; in addition, due to the thin thickness of the product tube plate, adopting Conventional high heat input welding methods can easily cause welding deformation, and it is difficult to meet the product welding standards of nuclea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/095B23K9/235
CPCB23K9/042B23K9/095B23K9/235
Inventor 杨松谢彦武王莉徐祥久王舒伟宋志鹏赵福冬杜玉华
Owner HARBIN ELECTRIC CORP QINHUANGDAO HEAVY EQUIP
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