CN110193678A - A kind of heat resisting steel plate soldering method - Google Patents
A kind of heat resisting steel plate soldering method Download PDFInfo
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- CN110193678A CN110193678A CN201910550719.5A CN201910550719A CN110193678A CN 110193678 A CN110193678 A CN 110193678A CN 201910550719 A CN201910550719 A CN 201910550719A CN 110193678 A CN110193678 A CN 110193678A
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- China
- Prior art keywords
- welded
- steel plate
- wlding
- welding
- heat resisting
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention proposes a kind of heat resisting steel plate soldering methods, include the following steps: step 1: wlding matching, and carry out baking processing to wlding, wherein and 350 DEG C of stoving temperature or more, baking time 2h or more；Step 2: it treats welding material and is preheated, 200 DEG C of preheating temperature or more；Step 3: the surface to be welded for treating welding material is handled, and at least one side between material to be welded is made to form inclined-plane recess；Step 4: according to the size of material to be welded, determining the specification and welding parameter of wlding.The present invention keeps the welding effect of high-temperature steel plate very ideal, and crackle and defect is both not present, and stress performance at high temperature under high pressure is also very excellent, meets the requirement of power station environment.
Description
Technical field
The invention belongs to boiler technology field, in particular to a kind of heat resisting steel plate soldering method.
Background technique
Currently, improving energy utilization rate, the key of energy-saving and emission-reduction is to improve extra-supercritical unit generating efficiency, raising power generation
The effective way of efficiency is to improve the temperature and pressure of its working media.Long-life high-temperature resistant material is the advanced ultra supercritical of development
The key of unit even more develops the restraining factors of unit of new generation, without high performance material, just without the efficient machine of a new generation
Group, therefore a national coal unit level represents the development level of material industry to a certain extent.China's steam turbine is high
Adiabator research is raised speed introducing since extra-supercritical unit, is in recent years even more to breach 620 DEG C of grade extra-supercritical unit materials
The research bottleneck of material realizes and industrializes and progressively reached the effect that world's Steam Turbine is led.630 DEG C and higher steaming
Vapour parameter proposes harsher requirement, high temperature key part such as rotor forging with material to unit, it is necessary to use more Gao Chijiu
The material of creep strength is just able to achieve the raising of unit efficiency.In a very long time in past, for the fire coal for realizing more high parameter
Generation schedule, domestic and international material maker endeavour the exploitation of new material, and Europe and the U.S. more lay particular emphasis on nickel base superalloy
Exploitation；To ensure economy, China and Japan are further improved 9Cr martensite heat-resistant steel, form novel 9Cr-3W-
3Co series martensite heat-resistant steel can be used for the new material of 630 DEG C of boiler high temperature reheating outlet headers.From 2012, science and technology is relied on
Portion's 863 Program " advanced ultra supercritical coal-fired unit key boiler tube exploitation " project, has carried out G115 steel thick-wall and large-diameter tube
Research and development, solve a series of problems in industrial processes, have had been provided with production outer diameter 19mm~1200mm, wall thickness
The ability of the full pedigree boiler tube of 2mm~100mm, heat resisting steel faces bigger difficulty in welding, although heat resisting steel itself
Fine heat-resisting performance, the performance of various aspects stress is ideal, but how heat resisting steel is preferably welded together the phase that seems
When intractable.Therefore after developing the raw material that performance indexes is met the requirements, the wlding with superperformance is matched, with
And how raw material are welded also at urgent problem to be solved, there are two types of solutions common at present, and one is open
The wlding of close match is issued, another kind is to select high matched nickel-base alloy wlding, compares two kinds of routes, nickel-base alloy wlding
Advantage is that existing wlding is mature, can bring and use, but increases the inhomogeneities of welding point, residual stress after welding
It can not eliminate, but not currently exist the high wlding of matching degree, a kind of suitable welding method is also not present, weldering can be eliminated
The residual stress connect, to guarantee the welding effect of heat resisting steel.
Therefore, it in view of above scheme in actual fabrication and in place of implementing using upper missing, and corrected, improved, together
When in line with the spirit and theory asked, and by the knowledge of profession, the auxiliary of experience, and after multi-party clever thought, test, just found
Of the invention out, spy provides a kind of heat resisting steel plate soldering method again, can make the welding effect of high-temperature steel plate very
Crackle and defect is both not present in ideal, and stress performance at high temperature under high pressure is also very excellent, and the use for meeting power station environment is wanted
It asks.
Summary of the invention
The present invention proposes a kind of heat resisting steel plate soldering method, solves the problems of the prior art.
The technical scheme of the present invention is realized as follows: heat resisting steel plate soldering method, includes the following steps:
Step 1: wlding matching, and baking processing is carried out to wlding, wherein and 350 DEG C of stoving temperature or more, baking time
2h or more；
Step 2: it treats welding material and is preheated, 200 DEG C of preheating temperature or more；
Step 3: the surface to be welded for treating welding material is handled, and at least one side between material to be welded is made to form one tiltedly
Face recess；
Step 4: according to the size of material to be welded, determining the specification and welding parameter of wlding.
As a preferred embodiment, the material to be welded in step 2 is G115 steel,.
As a preferred embodiment, the wlding in step 1 is CHH767.
As a preferred embodiment, the surface to be welded for treating welding material in step 3 is handled, including by one
The end surface of material to be welded is processed into an inclined surface: first surface, and the end surface of another material to be welded is added
Two inclined surfaces that work intersects at protrusion: second surface and third surface, wherein second surface and first surface have identical
Tilt angle.
As a preferred embodiment, second surface and third surface are symmetrically set about the middle face of the material to be welded
It sets, and the angle between second surface and third surface and middle face is 60 °.
As a preferred embodiment, the surface to be welded for treating welding material in step 3 is handled, including by one
The end surface of material to be welded is processed into relevant two inclined surfaces of protrusion: the 4th surface and the 5th surface, by it is another to
The end surface of welding material is processed into two inclined surfaces of protrusion intersection: the 6th surface and the 7th surface, wherein the 4th table
Face and the 5th surface tilt angle having the same；6th surface and the 7th surface tilt angle having the same.
As a preferred embodiment, the 4th surface and the 5th surface in the material to be welded about facing
Claim, and the 4th surface and the 5th surface face Jun Yuzhong are in 60 ° of angles.
As a preferred embodiment, the 6th surface and the 7th surface in the material to be welded about facing
Claim, and the 6th surface and the 7th surface face Jun Yuzhong are in 60 ° of angles.
As a preferred embodiment, the thickness of to be welded material of the length of the wlding more than or equal to twice.
As a preferred embodiment, the specification of wlding is 4.0mm diameter in step 4, the parameter of welding is welding
Electric current 160A-180A, weldingvoltage 22V-26V, speed of welding 150mm/min.
After above-mentioned technical proposal, the beneficial effects of the present invention are: being carried out by Proper Match wlding, and to wlding
The high temperature of enough time bakes, and preheats to material to be welded, then the welding mouth-shaped to wlding is cooperated to carry out reasonably
Design, keeps the welding effect of high-temperature steel plate very ideal, and crackle and defect, stress sheet at high temperature under high pressure is both not present
It is now also very excellent, meet the requirement of power station environment.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other drawings based on these drawings.
Fig. 1 is flow diagram of the invention；
Fig. 2 is macroscopical schematic diagram of welding of the embodiment of the present invention；
Fig. 3 is the metallographic schematic diagram of welding of the embodiment of the present invention；
Fig. 4 is welded structure of embodiment of the present invention schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As Figure 1-Figure 4, this heat resisting steel plate soldering method, includes the following steps:
Step 1: wlding matching, and baking processing is carried out to wlding, wherein and 350 DEG C of stoving temperature or more, baking time
2h or more；Step 2: it treats welding material and is preheated, 200 DEG C of preheating temperature or more；
Step 3: the surface to be welded for treating welding material is handled, and at least one side between material to be welded is made to form one tiltedly
Face recess；Step 4: according to the size of material to be welded, determining the specification and welding parameter of wlding.
Material to be welded in step 2 is G115 steel.
If following table is the different stress times test to different G115 steel samples at different temperatures, it is known that G115 steel itself
It is able to satisfy under high temperature and answers force request.
Below with reference to Fig. 4, the concrete outcome of this method is illustrated by a specific embodiment:
(1) testing standard: GB4675.
(2) welding material: matching wlding CHH767, wlding bake 350 DEG C/2-2.5h.
(3) test material: G115,200 × 84 × 30/200 × 76.2 × 30.
(4) preheating and welding condition, as shown in table 5-10.
It for G115 steel, is welded using treatment method, and further, the wlding in step 1 is CHH767.
The surface to be welded that welding material is treated in step 3 is handled, and is inclined including the end surface of a material to be welded is processed into one
Oblique surface: first surface, by the end surface of another material to be welded be processed into protrusion intersection two inclined surfaces: second
Surface and third surface, wherein second surface and first surface tilt angle having the same.Second surface and third surface are closed
It is symmetrical arranged in the middle face of the material to be welded, and the angle between second surface and third surface and middle face is 60 °.Or
Person, the surface to be welded that welding material is treated in step 3 is handled, prominent including the end surface of a material to be welded to be processed into
Play relevant two inclined surfaces: the end surface of another material to be welded is processed into protrusion by the 4th surface and the 5th surface
Two inclined surfaces of intersection: the 6th surface and the 7th surface, wherein the 4th surface and the 5th surface inclination angle having the same
Degree；6th surface and the 7th surface tilt angle having the same.4th surface and the 5th surface are about the material to be welded
Face is symmetrical in material, and the 4th surface and the 5th surface face Jun Yuzhong are in 60 ° of angles.6th surface and the 7th surface are about this
Face is symmetrical in material to be welded, and the 6th surface and the 7th surface face Jun Yuzhong are in 60 ° of angles.The length of the wlding be greater than etc.
In the thickness of twice of material to be welded.The specification of wlding is 4.0mm diameter in step 4, and the parameter of welding is welding current
160A-180A, weldingvoltage 22V-26V, speed of welding 150mm/min.Further, it is additionally provided with step 5 after step 4,
It is heat-treated after welding has been completed, 760 ± 15 DEG C of heat treatment temperature, handles time 2h.
It is as shown in the table for welding result, it indicates in 200 DEG C or more of preheating temperature, welding effect is ideal, does not have
Crackle.
| Number | Preheating temperature (DEG C) | Heat disappears hydrogen afterwards | PT flaw detection | Metallographic |
| XY-1 | 200 | 300℃/2h | Flawless | Zero defect |
| XY-2 | 150 | 300℃/2h | Flawless | There is micro-crack |
| XY-3 | 200 | Nothing | Flawless | Zero defect |
| XY-4 | 150 | Nothing | Flawless | There is micro-crack |
Welding is macroscopical and thinks that picture is as Figure 2-3 more, shows good welding result, the combination of nondestructive testing is also
It is all qualified.This method is by Proper Match wlding, and the high temperature for carrying out enough time to wlding bakes, to material to be welded
It is preheated, then the welding mouth-shaped to wlding is cooperated to carry out reasonable design, make the welding effect of high-temperature steel plate very
Crackle and defect is both not present in ideal, and stress performance at high temperature under high pressure is also very excellent, and the use for meeting power station environment is wanted
It asks
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of heat resisting steel plate soldering method, which comprises the steps of:
Step 1: wlding matching and carries out baking processing to wlding, wherein 350 DEG C of stoving temperature or more, baking time 2h and
More than；
Step 2: it treats welding material and is preheated, 200 DEG C of preheating temperature or more；
Step 3: the surface to be welded for treating welding material is handled, and keeps one inclined-plane of at least one side formation between material to be welded recessed
It falls into；
Step 4: according to the size of material to be welded, determining the specification and welding parameter of wlding.
2. heat resisting steel plate soldering method according to claim 1, which is characterized in that the material to be welded in step 2
Material is G115 steel,.
3. heat resisting steel plate soldering method according to claim 2, which is characterized in that the wlding in step 1 is
CHH767。
4. heat resisting steel plate soldering method according to claim 3, which is characterized in that material to be welded in step 3
The surface to be welded of material is handled, including the end surface of a material to be welded is processed into an inclined surface: first surface,
The end surface of another material to be welded is processed into two inclined surfaces of protrusion intersection: second surface and third surface,
Middle second surface and first surface tilt angle having the same.
5. heat resisting steel plate soldering method according to claim 4, which is characterized in that second surface and third surface
Middle face about the material to be welded is symmetrical arranged, and the angle between second surface and third surface and middle face is 60 °.
6. heat resisting steel plate soldering method according to claim 3, which is characterized in that material to be welded in step 3
The surface to be welded of material is handled, including the end surface of a material to be welded is processed into relevant two nauropemeters of protrusion
Face: the end surface of another material to be welded is processed into two inclined surfaces of protrusion intersection by the 4th surface and the 5th surface:
6th surface and the 7th surface, wherein the 4th surface and the 5th surface tilt angle having the same；6th surface and the 7th table
Face tilt angle having the same.
7. heat resisting steel plate soldering method according to claim 6, which is characterized in that the 4th surface and the 5th
Surface is symmetrical about face in the material to be welded, and the 4th surface and the 5th surface face Jun Yuzhong are in 60 ° of angles.
8. heat resisting steel plate soldering method according to claim 7, which is characterized in that the 6th surface and the 7th
Surface is symmetrical about face in the material to be welded, and the 6th surface and the 7th surface face Jun Yuzhong are in 60 ° of angles.
9. heat resisting steel plate soldering method according to claim 8, which is characterized in that the length of the wlding is greater than
The thickness of material to be welded equal to twice.
10. heat resisting steel plate soldering method according to claim 1, which is characterized in that the specification of wlding in step 4
For 4.0mm diameter, the parameter of welding is welding current 160A-180A, weldingvoltage 22V-26V, speed of welding 150mm/
min。
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Application publication date: 20190903 |