CN111621634A - Postweld heat treatment process - Google Patents
Postweld heat treatment process Download PDFInfo
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- CN111621634A CN111621634A CN202010583866.5A CN202010583866A CN111621634A CN 111621634 A CN111621634 A CN 111621634A CN 202010583866 A CN202010583866 A CN 202010583866A CN 111621634 A CN111621634 A CN 111621634A
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- 238000010438 heat treatment Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000008569 process Effects 0.000 title claims abstract description 19
- 239000000919 ceramic Substances 0.000 claims abstract description 117
- 239000000835 fiber Substances 0.000 claims abstract description 117
- 238000003825 pressing Methods 0.000 claims abstract description 60
- 238000003466 welding Methods 0.000 claims abstract description 39
- 238000004321 preservation Methods 0.000 claims abstract description 21
- 238000009413 insulation Methods 0.000 claims abstract description 7
- 238000000576 coating method Methods 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 7
- 230000000694 effects Effects 0.000 abstract description 28
- 238000003756 stirring Methods 0.000 description 8
- 239000011248 coating agent Substances 0.000 description 4
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000008570 general process Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/50—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/34—Methods of heating
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- Crystallography & Structural Chemistry (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Fiber Materials (AREA)
Abstract
The invention belongs to the technical field of welding, and particularly relates to a postweld heat treatment process; the heat preservation equipment used in the process comprises two arc-shaped clamping plates, wherein the two arc-shaped clamping plates are arranged in an up-down symmetrical mode, the contact part of the two arc-shaped clamping plates is a horizontal section, and the horizontal sections of the two arc-shaped clamping plates are fixed through bolts; according to the invention, the pressing discs with the same size as the workpiece are arranged on the two sides of the ceramic fiber blanket, the two arc-shaped clamping plates are covered on the welding seam of the workpiece, then the arc-shaped clamping plates are tightly fixed through the bolts, the ceramic fiber blanket is covered on the surface of the workpiece, then the two pressing discs are sleeved on the workpiece on the two sides of the arc-shaped clamping plates, then the two pressing discs are close to each other, and then the two pressing discs push the ceramic fiber blanket positioned on the outer sides of the arc-shaped clamping plates to enter the gap between the arc-shaped clamping plates and the workpiece, so that the ceramic fiber blanket tightly attached to the workpiece is more compact, the attaching effect with the smaller workpiece is better, and the heat insulation effect on.
Description
Technical Field
The invention belongs to the technical field of welding, and particularly relates to a postweld heat treatment process.
Background
The welding residual stress is caused by uneven temperature distribution of a weldment caused by welding, expansion and contraction of weld metal, and the like, and all the welding construction is accompanied by the residual stress. The post-weld heat treatment is a heat treatment performed to remove residual stress of the welded joint and improve the structure and properties of the welded joint. The most common method for eliminating residual stress is high-temperature tempering, namely, a weldment is heated to a certain temperature and is kept for a certain time, plastic flow is generated at a place with high internal stress by utilizing the reduction of the yield limit of a material at a high temperature, the elastic deformation is gradually reduced, and the plastic deformation is gradually increased to reduce the stress, and the general process flow is as follows: installing a thermocouple → arranging a heating device → setting heat treatment parameters → wrapping heat preservation cotton → carrying out heat treatment.
Because the diameters of the existing workpieces are different, in order to enable the heat preservation equipment to adapt to different workpieces, the inner diameter of the heat preservation equipment is larger than that of the workpieces, and further when the ceramic fiber blanket contacts the workpieces and preserves the heat of the workpieces, the ceramic fiber blanket is poor in contact tightness with the workpieces with smaller diameters and cannot be tightly attached to the workpieces, so that the heat preservation effect of the workpieces is influenced.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a postweld heat treatment process to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a post-weld heat treatment process, comprising the steps of:
s1: installing the hot end point of the thermocouple in a range of 30mm away from the welding line, binding the top of the hot end of the thermocouple at the center of the welding line, ensuring reliable contact of the hot end, fixing the cold end of the thermocouple, and correctly connecting a compensation lead with the thermocouple; the top of the hot end of the thermocouple is bound at the center of the welding seam, so that the accuracy of measuring the temperature of the welding seam is ensured;
s2: selecting a heater suitable for the current workpiece according to the shape of the workpiece, ensuring that the heating width of the processed welding line is covered by the heater, and ensuring that the uniform heating width is not less than 3 times of the thickness of the welding line on each side of the center line of the welding line and is not less than 60 mm;
s3: covering and insulating the welding seam by using insulation equipment, covering the welding seam of the workpiece by using the two arc-shaped clamping plates, fixing the workpiece by using bolts to ensure that the ceramic fiber blankets on the inner sides of the arc-shaped clamping plates are tightly attached to the welding seam, and extruding the ceramic fiber blankets into the arc-shaped plates from two sides by using two pressing discs; the two pressing discs can push the ceramic fiber blanket to move towards the arc-shaped clamping plate, so that the volume of the ceramic fiber blanket in the arc-shaped clamping plate is larger, and the contact effect of the ceramic fiber blanket and a workpiece is better;
s4: starting a heater to heat the workpiece, wherein the heating temperature is 300-;
the heat preservation equipment in the S3 comprises two arc-shaped clamping plates, the two arc-shaped clamping plates are arranged in an up-down symmetrical mode, the contact part of the two arc-shaped clamping plates is a horizontal section, the horizontal sections of the two arc-shaped clamping plates are fixed through bolts, ceramic fiber blankets are arranged on the inner sides of the two arc-shaped clamping plates, and the two ends of each ceramic fiber blanket extend to the outer sides of the arc-shaped clamping plates; the two sides of the arc-shaped clamping plate are provided with pressing discs, and the pressing discs are in contact with the end parts of the ceramic fiber blankets; the front side and the rear side of the compression disc are fixedly connected with fixing rods; when the ceramic fiber blanket is used, because the diameters of the existing workpieces are different, in order to enable the heat preservation equipment to adapt to different workpieces, the inner diameter of the heat preservation equipment is larger than that of the workpieces, and further when the ceramic fiber blanket is in contact with the workpieces and preserves the heat of the workpieces, the ceramic fiber blanket is poorer in contact tightness with the workpieces with smaller diameters and cannot be tightly attached to the workpieces, so that the heat preservation effect on the workpieces is influenced; the specific measures and the using process are as follows: the pressing discs with the same size as the workpiece are arranged on the two sides of the ceramic fiber blanket, the middle of the ceramic fiber blanket is fixed with the arc-shaped clamping plates, the two arc-shaped clamping plates are covered on the welding seams of the workpiece, then the arc-shaped clamping plates are tightly fixed through bolts, the ceramic fiber blanket is covered on the surface of the workpiece, the two pressing discs are sleeved on the workpiece on the two sides of the arc-shaped clamping plates, the two pressing discs are close to each other, the ceramic fiber blanket located on the outer sides of the arc-shaped clamping plates is pushed by the two pressing discs to enter gaps between the arc-shaped clamping plates and the workpiece, the ceramic fiber blanket tightly attached to the workpiece is more compact, the attaching effect of the ceramic fiber blanket to the smaller workpiece is better, and the heat insulation; and finally, winding the opposite fixing rods on different pressing disks by using steel wires to ensure that the pressing disks keep pressing the ceramic fiber blanket.
Preferably, one surface of the pressing disc, which is close to the arc-shaped clamping plate, is provided with a plurality of right-angle plates, the right-angle plates are hinged with the pressing disc, two surfaces of the inner sides of the right-angle plates are arc-shaped surfaces, and one ends of the right-angle plates are positioned inside the ceramic fiber blanket; compress tightly the dish and be close to each other and compress tightly the ceramic fiber blanket for two, compress tightly when the dish is close to the arc cardboard, compress tightly right-angle plate on the dish and contact behind the arc cardboard, the one end that the right-angle plate contacted the arc cardboard earlier can be to the outer fringe department deflection of arc cardboard, and then the one end that the right-angle plate is located the ceramic fiber blanket also can take place to deflect to the direction that is close to the arc cardboard, and then stir the ceramic fiber blanket faster in the arc cardboard, and with the ceramic fiber blanket volume of stirring more in the arc cardboard, the ceramic fiber blanket is inseparabler with the work piece contact, further improved the heat preservation effect to the work piece.
Preferably, a pressing plate is arranged between the right-angle plate and the arc-shaped clamping plate, the pressing plate is arc-shaped, the top of the pressing plate is fixedly connected with a mandril, one end of the mandril, which is far away from the pressing plate, is contacted with the right-angle plate, a limiting ring is arranged on the outer side of the mandril, the limiting ring is fixedly connected with the arc-shaped clamping plate, the bottom of the limiting ring is fixedly connected with a return spring, and one end of the return spring is; contact the arc cardboard at the right-angle plate and before deflecting, the right-angle plate can at first receive the ejector pin and block and take place to deflect, and then the right-angle plate can have reaction force to the ejector pin, push down the ejector pin and move, the ejector pin promotes the ceramic fiber blanket of pressure strip extrusion arc cardboard outside edge, and then have the pressure effect to the ceramic fiber blanket, when the one end that is located the ceramic fiber blanket at the right-angle plate stirs the ceramic fiber blanket and removes in the arc cardboard, the pressure effect of pressure strip, can guarantee that the ceramic fiber blanket enters into the arc cardboard along the direction with the work piece parallel and level in, the effect of stirring in the inside arc cardboard of ceramic fiber blanket has been guaranteed.
Preferably, one side of the pressing plate, which is far away from the arc-shaped clamping plate, is fixedly connected with an outward extending plate, the outward extending plate is arc-shaped, and the free end of the outward extending plate is bent towards the ceramic fiber blanket; when the pressure strip compresses tightly the ceramic fiber blanket along the direction of perpendicular to work piece, the free end of overhanging board is crooked to ceramic fiber blanket department, can promote the in-process that partly ceramic fiber blanket got into the arc cardboard at the right angle board, plays the effect that blocks to ceramic fiber blanket, when preventing to promote ceramic fiber blanket, and ceramic fiber blanket is to the inboard inflation of right angle board.
Preferably, heat-resistant coatings are smeared on two surfaces of the inner side of the right-angle plate, and copper powder is doped in the heat-resistant coatings; heat-resisting coating has all been smeared on two faces of right-angle plate inboard, reduces the wearing and tearing when right-angle plate and arc cardboard and ceramic fiber blanket rub to it has the copper powder to dope in heat-resisting coating, through the good heat conductivity of copper, can make the temperature on right-angle plate surface more even, and is better with the conduction effect of heat conduction on the ceramic fiber blanket.
Preferably, one end of the ejector rod, which is far away from the pressing plate, is provided with a chamfer, and the chamfer is completely contacted with the right-angle plate; the one end that the pressure strip was kept away from to the ejector pin is equipped with a scarf, and when can making right-angle plate and ejector pin contact, the scarf on the ejector pin can promote the right-angle plate smoothly and become the tilt state, guarantees the smooth promotion of right-angle plate to the ceramic fibre blanket.
The invention has the technical effects and advantages that:
1. according to the ceramic fiber blanket, the pressing discs which are the same as the workpiece in size are arranged on the two sides of the ceramic fiber blanket, the middle of the ceramic fiber blanket is fixed with the arc-shaped clamping plates, the two arc-shaped clamping plates are covered on the welding seams of the workpiece, then the arc-shaped clamping plates are tightly fixed through the bolts, so that the ceramic fiber blanket is covered on the surface of the workpiece, then the two pressing discs are sleeved on the workpiece on the two sides of the arc-shaped clamping plates, then the two pressing discs are close to each other, and further the two pressing discs push the ceramic fiber blanket located on the outer sides of the arc-shaped clamping plates to enter the gaps between the arc-shaped clamping plates and the workpiece, so that the ceramic fiber blanket tightly attached to the workpiece is more compact, the attaching effect with.
2. When the two pressing discs are close to each other to press the ceramic fiber blanket, and when the pressing discs are close to the arc-shaped clamping plate, the right-angle plate on the pressing discs is in contact with the arc-shaped clamping plate, one end of the right-angle plate, which is in contact with the arc-shaped clamping plate first, can deflect towards the outer edge of the arc-shaped clamping plate, and then one end of the right-angle plate, which is located in the ceramic fiber blanket, can also deflect towards the direction close to the arc-shaped clamping plate, so that the ceramic fiber blanket is stirred into the arc-shaped clamping plate more quickly, the ceramic fiber blanket is stirred into the arc-shaped clamping plate more, the ceramic fiber blanket is in closer contact with a workpiece, and the heat.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a process flow diagram of the present invention;
FIG. 2 is a schematic view of the operation of the heat-retaining device used in the present invention;
FIG. 3 is a schematic view of the present invention with the workpiece removed from FIG. 2;
FIG. 4 is an enlarged view of portion A of FIG. 3 according to the present invention;
in the figure: arc cardboard 1, ceramic fibre blanket 2, compress tightly dish 3, dead lever 4, right angle board 5, pressure strip 6, ejector pin 7, spacing ring 8, return spring 9, overhanging board 10.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1-4, the post-weld heat treatment process of the present invention comprises the following steps:
s1: installing the hot end point of the thermocouple in a range of 30mm away from the welding line, binding the top of the hot end of the thermocouple at the center of the welding line, ensuring reliable contact of the hot end, fixing the cold end of the thermocouple, and correctly connecting a compensation lead with the thermocouple; the top of the hot end of the thermocouple is bound at the center of the welding seam, so that the accuracy of measuring the temperature of the welding seam is ensured;
s2: selecting a heater suitable for the current workpiece according to the shape of the workpiece, ensuring that the heating width of the processed welding line is covered by the heater, and ensuring that the uniform heating width is not less than 3 times of the thickness of the welding line on each side of the center line of the welding line and is not less than 60 mm;
s3: covering and insulating the welding seam by using insulation equipment, covering the welding seam of the workpiece by using the two arc-shaped clamping plates 1, fixing the welding seam by using bolts to ensure that the ceramic fiber blankets 2 on the inner sides of the arc-shaped clamping plates 1 are tightly attached to the welding seam, and extruding the ceramic fiber blankets 2 into the arc-shaped plates from two sides by using the two pressing discs 3; the two pressing discs 3 can push the ceramic fiber blanket 2 to move towards the arc-shaped clamping plate 1, so that the volume of the ceramic fiber blanket 2 in the arc-shaped clamping plate 1 is larger, and the contact effect of the ceramic fiber blanket 2 and a workpiece is better;
s4: starting a heater to heat the workpiece, wherein the heating temperature is 300-;
the heat preservation device in the S3 comprises two arc-shaped clamping plates 1, the two arc-shaped clamping plates 1 are symmetrically arranged up and down, the contact part of the two arc-shaped clamping plates 1 is a horizontal section, the horizontal sections of the two arc-shaped clamping plates 1 are fixed through bolts, ceramic fiber blankets 2 are arranged on the inner sides of the two arc-shaped clamping plates 1, and two ends of each ceramic fiber blanket 2 extend to the outer sides of the arc-shaped clamping plates 1; the two sides of the arc-shaped clamping plate 1 are both provided with a pressing plate 3, and the pressing plates 3 are in contact with the end part of the ceramic fiber blanket 2; the front side and the rear side of the compression disc 3 are fixedly connected with fixing rods 4; when the ceramic fiber blanket is in work, because the diameters of the existing workpieces are different, in order to enable the heat preservation equipment to adapt to different workpieces, the inner diameter of the heat preservation equipment is larger than that of the workpieces, and further when the ceramic fiber blanket 2 is in contact with the workpieces with smaller diameters and preserves heat of the workpieces, the ceramic fiber blanket 2 is poorer in contact tightness with the workpieces with smaller diameters and cannot be tightly attached to the workpieces, so that the heat preservation effect of the workpieces is influenced, the ceramic fiber blanket mainly solves the problem that how to enable the ceramic fiber blanket 2 to be tightly contacted with the smaller workpieces when the workpieces are preserved heat, and the heat preservation effect of the workpieces is ensured; the specific measures and the using process are as follows: the pressing discs 3 with the same size as the workpiece are arranged on the two sides of the ceramic fiber blanket 2, the middle of the ceramic fiber blanket 2 is fixed with the arc-shaped clamping plates 1, the two arc-shaped clamping plates 1 are covered on the welding seam of the workpiece, then the arc-shaped clamping plates 1 are tightly fixed through bolts, the ceramic fiber blanket 2 is covered on the surface of the workpiece, then the two pressing discs 3 are sleeved on the workpiece on the two sides of the arc-shaped clamping plates 1, then the two pressing discs 3 are close to each other, and the two pressing discs 3 push the ceramic fiber blanket 2 positioned on the outer side of the arc-shaped clamping plates 1 to enter the gap between the arc-shaped clamping plates 1 and the workpiece, so that the ceramic fiber blanket 2 tightly attached to the workpiece is more compact, the attaching effect with the smaller workpiece is better, and the heat insulation effect on; finally, the opposite fixing rods 4 on different pressing disks 3 are wound by steel wires, so that the pressing disks 3 keep pressing the ceramic fiber blanket 2.
One surface of the compression disc 3, which is close to the arc-shaped clamping plate 1, is provided with a plurality of right-angle plates 5, the right-angle plates 5 are hinged with the compression disc 3, two surfaces of the inner sides of the right-angle plates 5 are arc-shaped surfaces, and one ends of the right-angle plates 5 are positioned inside the ceramic fiber blanket 2; compress tightly dish 3 and be close to each other and compress tightly ceramic fiber blanket 2 when two, compress tightly when dish 3 is close to arc cardboard 1, compress tightly 5 rear contact arc cardboard 1 of right-angle plate on the dish 3, the one end that the right-angle plate 5 contacted arc cardboard 1 earlier can be to the outer fringe department deflection of arc cardboard 1, and then the one end that right-angle plate 5 is located ceramic fiber blanket 2 also can take place to the direction of being close to arc cardboard 1 and deflect, and then stir ceramic fiber blanket 2 more fast to arc cardboard 1, and with ceramic fiber blanket 2 more to the volume of stirring in the arc cardboard 1, ceramic fiber blanket 2 is inseparabler with the work piece contact, further improved the heat preservation effect to the work piece.
A pressing plate 6 is arranged between the right-angle plate 5 and the arc-shaped clamping plate 1, the pressing plate 6 is arc-shaped, the top of the pressing plate 6 is fixedly connected with a mandril 7, one end, far away from the pressing plate 6, of the mandril 7 is contacted with the right-angle plate 5, a limiting ring 8 is arranged on the outer side of the mandril 7, the limiting ring 8 is fixedly connected with the arc-shaped clamping plate 1, the bottom of the limiting ring 8 is fixedly connected with a return spring 9, and one end of the return spring 9 is fixedly; contact arc cardboard 1 and before deflecting at right-angle board 5, right-angle board 5 can receive ejector pin 7 at first and stop and take place to deflect, and then right-angle board 5 can have reaction force to ejector pin 7, push down ejector pin 7 and move, ejector pin 7 promotes 6 extrudees at the ceramic fiber blanket 2 of 1 outside edge of arc cardboard, and then have the compacting action to ceramic fiber blanket 2, stir ceramic fiber blanket 2 to the removal in arc cardboard 1 in the one end that right-angle board 5 is located ceramic fiber blanket 2, the compacting action of closing plate 6, can guarantee that ceramic fiber blanket 2 enters into arc cardboard 1 along the direction with the work piece parallel and level in, the effect of stirring in the inside arc cardboard 1 of ceramic fiber blanket 2 has been guaranteed.
One side of the pressing plate 6, which is far away from the arc-shaped clamping plate 1, is fixedly connected with an outward extending plate 10, the outward extending plate 10 is arc-shaped, and the free end of the outward extending plate 10 is bent towards the ceramic fiber blanket 2; when the pressure strip 6 compresses tightly ceramic fiber blanket 2 along the direction of perpendicular to work piece, the free end of overhanging board 10 is crooked to ceramic fiber blanket 2 department, can promote the in-process that partly ceramic fiber blanket 2 got into arc cardboard 1 at right angle board 5, plays the effect that blocks to ceramic fiber blanket 2, when preventing to promote ceramic fiber blanket 2, and ceramic fiber blanket 2 is to the inboard inflation of right angle board 5.
Two surfaces of the inner side of the right-angle plate 5 are coated with heat-resistant coatings, and copper powder is doped in the heat-resistant coatings; heat-resisting coating has all been smeared on two faces of 5 inboard right-angle plates, reduces the wearing and tearing when right-angle plate 5 rubs with arc cardboard 1 and ceramic fibre blanket 2 to doping has the copper powder in heat-resisting coating, through the good heat conductivity of copper, can make the temperature on right-angle plate 5 surface more even, and is better with the conduction effect of heat conduction on ceramic fibre blanket 2.
One end of the ejector rod 7, which is far away from the pressing plate 6, is provided with a chamfer, and the chamfer is completely contacted with the right-angle plate 5; the one end that the pressure strip 6 was kept away from to ejector pin 7 is equipped with a scarf, and when can making right-angle plate 5 and ejector pin 7 contact, the scarf on the ejector pin 7 can promote right-angle plate 5 smoothly and become the tilt state, guarantees that right-angle plate 5 promotes smoothly to ceramic fibre blanket 2.
When the ceramic fiber blanket is in work, because the diameters of the existing workpieces are different, in order to enable the heat preservation equipment to adapt to different workpieces, the inner diameter of the heat preservation equipment is larger than that of the workpieces, and further when the ceramic fiber blanket 2 is in contact with the workpieces with smaller diameters and preserves heat of the workpieces, the ceramic fiber blanket 2 is poorer in contact tightness with the workpieces with smaller diameters and cannot be tightly attached to the workpieces, so that the heat preservation effect of the workpieces is influenced, the ceramic fiber blanket mainly solves the problem that how to enable the ceramic fiber blanket 2 to be tightly contacted with the smaller workpieces when the workpieces are preserved heat, and the heat preservation effect of the workpieces is ensured; the specific measures and the using process are as follows: the pressing discs 3 with the same size as the workpiece are arranged on the two sides of the ceramic fiber blanket 2, the middle of the ceramic fiber blanket 2 is fixed with the arc-shaped clamping plates 1, the two arc-shaped clamping plates 1 are covered on the welding seam of the workpiece, then the arc-shaped clamping plates 1 are tightly fixed through bolts, the ceramic fiber blanket 2 is covered on the surface of the workpiece, then the two pressing discs 3 are sleeved on the workpiece on the two sides of the arc-shaped clamping plates 1, then the two pressing discs 3 are close to each other, and the two pressing discs 3 push the ceramic fiber blanket 2 positioned on the outer side of the arc-shaped clamping plates 1 to enter the gap between the arc-shaped clamping plates 1 and the workpiece, so that the ceramic fiber blanket 2 tightly attached to the workpiece is more compact, the attaching effect with the smaller workpiece is better, and the heat insulation effect on; finally, the opposite fixing rods 4 on different pressing disks 3 are wound by steel wires, so that the pressing disks 3 keep pressing the ceramic fiber blanket 2.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A postweld heat treatment process is characterized in that: the process comprises the following steps:
s1: installing the hot end point of the thermocouple in a range of 30mm away from the welding line, binding the top of the hot end of the thermocouple at the center of the welding line, ensuring reliable contact of the hot end, fixing the cold end of the thermocouple, and correctly connecting a compensation lead with the thermocouple;
s2: selecting a heater suitable for the current workpiece according to the shape of the workpiece, ensuring that the heating width of the processed welding line is covered by the heater, and ensuring that the uniform heating width is not less than 3 times of the thickness of the welding line on each side of the center line of the welding line and is not less than 60 mm;
s3: the welding seam is covered and insulated by insulation equipment, the welding seam of the workpiece is covered by the two arc-shaped clamping plates (1), then the arc-shaped clamping plates are fixed by bolts, so that the ceramic fiber blankets (2) on the inner sides of the arc-shaped clamping plates (1) are tightly attached to the welding seam, and the ceramic fiber blankets (2) are extruded into the arc-shaped clamping plates (1) from two sides by the two pressing discs (3);
s4: starting a heater to heat the workpiece, wherein the heating temperature is 300-;
the heat preservation device in the S3 comprises two arc-shaped clamping plates (1), the two arc-shaped clamping plates (1) are arranged in an up-down symmetrical mode, the contact position of the two arc-shaped clamping plates (1) is a horizontal section, the horizontal sections of the two arc-shaped clamping plates (1) are fixed through bolts, ceramic fiber blankets (2) are arranged on the inner sides of the two arc-shaped clamping plates (1), and two ends of each ceramic fiber blanket (2) extend to the outer sides of the arc-shaped clamping plates (1); the two sides of the arc-shaped clamping plate (1) are respectively provided with a pressing disc (3), and the pressing discs (3) are in contact with the end part of the ceramic fiber blanket (2); the front side and the rear side of the pressing disc (3) are fixedly connected with fixing rods (4).
2. The post-weld heat treatment process according to claim 1, wherein: the one side that compresses tightly dish (3) and be close to arc cardboard (1) is provided with a plurality of right-angle boards (5), and right-angle board (5) are articulated with compressing tightly dish (3), and two faces inboard of right-angle board (5) are the arcwall face, and the one end of right-angle board (5) is located inside ceramic fiber blanket (2).
3. The post-weld heat treatment process according to claim 2, wherein: be provided with pressure strip (6) between right angle board (5) and arc cardboard (1), pressure strip (6) are the arc, pressure strip (6) top has linked firmly ejector pin (7), the one end and the right angle board (5) contact of pressure strip (6) are kept away from in ejector pin (7), the ejector pin (7) outside is provided with spacing ring (8), spacing ring (8) link firmly with arc cardboard (1), return spring (9) have been linked firmly to spacing ring (8) bottom, return spring (9) one end links firmly with pressure strip (6).
4. The post-weld heat treatment process according to claim 3, wherein: one side of the pressing plate (6) far away from the arc-shaped clamping plate (1) is fixedly connected with an extending plate (10), the extending plate (10) is arc-shaped, and the free end of the extending plate (10) is bent towards the ceramic fiber blanket (2).
5. The post-weld heat treatment process according to claim 2, wherein: and heat-resistant coatings are coated on two surfaces of the inner side of the right-angle plate (5), and copper powder is doped in the heat-resistant coatings.
6. The post-weld heat treatment process according to claim 3, wherein: one end of the ejector rod (7) far away from the pressing plate (6) is provided with a chamfer which is completely contacted with the right-angle plate (5).
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| CN202010583866.5A CN111621634B (en) | 2020-06-23 | 2020-06-23 | Postweld heat treatment process |
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| CN202010583866.5A CN111621634B (en) | 2020-06-23 | 2020-06-23 | Postweld heat treatment process |
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| CN111621634B CN111621634B (en) | 2021-12-03 |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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