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Buildup welding deformation-resistant method for large-area flat plate type parts

A large-area, anti-deformation technology, applied in the field of surfacing and anti-deformation of large-area flat parts, can solve the problems of difficult equipment calibration and large parts, and achieve the effect of avoiding defects

Inactive Publication Date: 2020-02-28
HARBIN BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large size of the parts, it is difficult to realize the problem of equipment correction after surfacing welding, and a method of anti-deformation method for surfacing welding of flat plate parts that prevents the deformation of the tube plate is provided.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An anti-deformation method for overlay welding of large-area flat plate parts, the method includes the following steps:

[0018] Step 1: After the forgings pass the re-inspection at the factory, the surface of the tube plate to be surfacing is processed by the initial turning, and it is arched and processed from the circumference to the center with an angle of 1 degree inclined plane transition to a slightly spherical convex shape. After processing, it is to be stacked. The surface flaw detection of the welding surface is qualified, the other side of the tube plate is processed flat, and the machining allowance is left in the thickness direction, and the machine is flat after surfacing;

[0019] Step 2: Two tube sheets are stacked back to back, with the convex side facing outwards, and the flat side is close to each other, and they are decorated together to increase the rigidity of the parts to be welded to effectively resist the deformation of the surfacing welding, and...

Embodiment 2

[0024] According to the anti-deformation method of overlay welding of large-area flat plate parts described in Embodiment 1, the machining allowance in the thickness direction of the step 1 is 5-10mm.

Embodiment 3

[0026] According to the anti-deformation method of surfacing welding of large-area flat plate parts described in embodiment 1 or 2, the surfacing welding in the third step described above is 3-5mm.

[0027] The invention adopts measures from the three aspects of the external binding force of the tube plate, the anti-deformation and the selection of the surfacing welding method, and realizes the purpose of preventing the deformation of the surfacing welding of the tube plate. The process is as follows:

[0028] 1. Reserve a certain amount of anti-deformation before surfacing, and process the large-diameter thin-walled tube plate before surfacing, and process the surface to be surfacing into a slightly convex shape, from the periphery of the garden to the center at an angle of 1 degree Angle bevel transition way arching. The other side is turned flat, and only 5 mm is left in the thickness direction as a margin for processing the plane after surfacing. The pre-processed convex...

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Abstract

The invention provides a buildup welding deformation-resistant method for large-area flat plate type parts. For straight tubes, cleaning is generally conducted through compressed air; and for snake-like tube panels, due to the fact that scrap iron cannot be directly sawn by human eyes, the scrap iron is likely to be left in tubes to cause potential safety hazards. According to composition of the buildup welding deformation-resistant method, a tube end machining scrap iron prevention device comprises a shaft rod (1) and a shaft sleeve (2); the shaft rod is sleeved with the shaft sleeve; the shaft rod is sleeved with a bearing (5) and fixed to the bearing; the outer side of the bearing is fixed to the shaft sleeve; the shaft sleeve is sleeved with a rubber baffle (3) and a check ring (4); the shaft rod is sleeved with a bearing check ring (7) and a gasket (8) which are pressed on one side of the bearing; and a set of locking nuts (9) are connected to the shaft rod in a threaded manner. The buildup welding deformation-resistant method is used for the large-area flat plate type parts.

Description

Technical field: [0001] The invention relates to an anti-deformation method for overlay welding of large-area flat plate parts. Background technique: [0002] The most typical part of this kind is the tube sheet. The tube sheet is the core part of petrochemical heat exchange equipment. The medium in the tube side of the heat exchanger is corrosive and the flow rate is fast. The base material of the tube sheet is mostly made of low-alloy circular plate-shaped forgings, and the side of the tube that is in contact with the medium is surfacing welded with stainless steel or nickel-based anti-corrosion. , Multi-layer, multi-channel, and layer-by-layer overlapping. After surfacing welding, the flat surfacing surface of the car needs to be processed, and the machining allowance needs to be piled up during surfacing welding. The total surfacing welding thickness often reaches 9mm. With the superimposition of the number of surfacing layers, the amount of metal in the deposited layer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 于志杰王立昆张印江付太永范博
Owner HARBIN BOILER
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