CN101367148A - F92 base metal weld deposit cobalt based hard alloy process - Google Patents
F92 base metal weld deposit cobalt based hard alloy process Download PDFInfo
- Publication number
- CN101367148A CN101367148A CNA2007101202994A CN200710120299A CN101367148A CN 101367148 A CN101367148 A CN 101367148A CN A2007101202994 A CNA2007101202994 A CN A2007101202994A CN 200710120299 A CN200710120299 A CN 200710120299A CN 101367148 A CN101367148 A CN 101367148A
- Authority
- CN
- China
- Prior art keywords
- welding
- hard alloy
- mother metal
- weldpool
- based hard
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Abstract
The invention discloses a technique for performing the resurfacing welding of a cobalt-base hard alloy on F92 parent metal, which comprises the following steps: firstly, forming a weld pool at a part for resurfacing welding on the F92 parent metal, then bottoming with stainless steel on the bottom of the weld pool, welding the cobalt-base hard alloy by using a miscible material of the F92 parent metal and the stainless steel, preheating the parent metal and a welding rod before welding, and performing heat treatment with specific requirements to the part of resurfacing welding after welding. If the welding technique is used for welding the valve sealing surface of an ultra-supercritical machine set, the valve sealing surface can be wearable, cavitation corrosion resistant and high-voltage resistant, and have low price.
Description
Technical field
The present invention relates to a kind of F92 mother metal built-up welding cobalt based hard alloy process, belong to the special steel welding technology field.
Background technology
The F92 steel is as a kind of outstanding high-temperature refractory steel, be widely used in overcritical and overcritical station boiler, because F92 is many from external import, the research of domestic welding manner to it is less, and valve must have higher requirement to its welding manner, welding parameter as the crucial control piece of ultra supercritical unit.
But F92 is not suitable for as sealing surface, its wearability, and cavitation resistive property is bad, and antiscour does not resist and wipe deeply, and cobalt base hard alloy is not wear-resisting, and the gasproof erosion is highly suitable for the manufacturing of sealing surface, is exactly the price comparison costliness.
Summary of the invention
The object of the present invention is to provide a kind of F92 mother metal built-up welding cobalt based hard alloy process, improve the quality of welding, it can produce and be fit to the valve that use in the ultra supercritical power station.
Technical scheme of the present invention is achieved in that this F92 mother metal built-up welding cobalt based hard alloy process, and its step is:
A:, form weldpool at the position that needs built-up welding with the roughing of F92 mother metal;
B:, then, the stainless steel layer of bottoming is disposed with the bottoming of A307 austenitic stainless steel in the weldpool bottom, kept the F92 of weldpool bottom and the body that dissolves each other of A307;
C: mother metal and welding rod are carried out preheating;
D: welding, from the starting the arc of welding bead center, receive acnode and covered arcing point, and close at the center of weldpool;
E: post weld heat treatment.
Described step a weldpool is annular weldpool, and the weldpool degree of depth is 4～5mm.
Stainless steel is that the thickness of A307 bottoming is 2～3mm among the described step b.
(1) preheat temperature is 680 ℃～700 ℃; (2) temperature retention time 1～5h; (3) programming rate＜150 ℃; (4) mode of heating: continuous electric heating.
Welding rod is the cobalt base hard alloy welding rod of department too upright 6 or department too upright 12 among the described step c, and core diameter is 4mm.
Be 150 ℃～200 ℃ of preheat temperatures to the welding rod preheating among the described step c, insulation 1h.
Welding current is 190～230A in the described steps d, and described welding arc is a short arc, the temperature of welding base metal〉600 ℃.
Described steps d post weld heat treatment comprises: (1) heating-up temperature: 720 ℃～730 ℃; (2) temperature retention time: 2～4h; (3) programming rate:＜150 ℃/h; (4) mode of heating; Heating continuously; (5) type of cooling: furnace cooling; (6) tapping temperature:＜200 ℃.
The present invention adopts stainless steel and F92 mother metal to form the thing that dissolves each other at the bottom of weldpool, the utilization thing that dissolves each other comes cobalt base hard alloy is welded, and the various data in the welding process are optimized, make F92 mother metal built-up welding cobalt base hard alloy become feasible, practicality, applicable in the valve sealing face welding of ultra supercritical unit.
Description of drawings
Fig. 1 is the structural representation that forms weldpool on the F92 mother metal;
Fig. 2 is a heat treatment process standard curve map in the welding process.
The specific embodiment
Below in conjunction with accompanying drawing F92 mother metal built-up welding cobalt based hard alloy process is described, concrete operation method is as follows: the part of mother metal built-up welding is processed into weldpool, the specification of weldpool as shown in Figure 1, the degree of depth of weldpool is 4.5mm, width is 6.5mm, feel secure with the A307 austenitic stainless steel in the bottom of weldpool then, bottoming thickness is 2.5mm, form F92 and the austenitic thing that dissolves each other of A307 in the weldpool bottom, the thickness of thing of dissolving each other is 2.5mm, with the thing car light that dissolves each other in the weldpool, only keeps thin their thing that dissolves each other of one deck in the weldpool bottom with lathe, next be exactly that mother metal preheating and welding rod cure, welding rod cures in electric dry oven and carries out, and stoving temperature is 180 ℃, after reaching stoving temperature, be incubated 1 hour, welding rod is selected the welding rod of 4mm among the stellite 6 for use.
The mother metal preheating is put into electric furnace to mother metal exactly, and the electric furnace of switching on then raises the interior temperature of stove gradually, control programming rate, surpasses 150 ℃/h, is warmed up to about 690 ℃, and electric furnace is incubated, and the time of insulation is 1.5 hours.
Under the high temperature of mother metal, weld, the temperature of mother metal is not less than 600 ℃ during welding, measure with infrared radiation thermometer, welding current is 200～220A, from the starting the arc of weldpool center, the short arc welding, slowly transport arc, welding rod is not swung, and slightly is molten into suitable with the both sides mother metal, the arcing point and the multiple spot that will cover the front when receiving arc are several down, the center that closes at weldpool.Be lower than 600 ℃ if the temperature of mother metal F92 in welding process, occurs, then mother metal put back to electric furnace and heat again.
After welding finishes, need heat-treat, in electric furnace, 720～730 ℃ of heating-up temperatures, constant temperature 3 hours, the programming rate of electric furnace is no more than 150 ℃/h, after temperature retention time arrives, disconnect electric furnace, make the workpiece furnace cooling, when temperature is higher than 200 ℃ in stove, workpiece must not be come out of the stove.(sweating heat processing procedure standard curve is seen Fig. 2)
The mechanical property of bead-welding technology of the present invention sees Table:
Table 1
| Tensile strength (MPa) | Percentage elongation (%) |
| ≥911 | ≥25.4 |
Below for the present invention welds heap technology, the fast test of cooling at high temperature:
Table 2 is put into water and is cooled off fast for workpiece is heated to 450 ℃:
| Specimen coding | Hardness (HRC) | Penetrating inspection |
| 1 | 40-44 | Pore-free, crackle, indeformable |
| 2 | 39-41 | Pore-free, crackle, indeformable |
| 3 | 41-43 | Pore-free, crackle, indeformable |
Table 3 is put into water and is cooled off fast for workpiece is heated to 600 ℃:
| Specimen coding | Hardness (HRC) | Penetrating inspection |
| 1 | 39-42 | Pore-free, crackle, indeformable |
| 2 | 38-41 | Pore-free, crackle, indeformable |
| 3 | 39-42 | Pore-free, crackle, indeformable |
Illustrate: by this test as can be seen, F92 mother metal built-up welding cobalt base hard alloy under variations in temperature condition under the higher temperature and faster, can keep higher hardness and original shape.
Claims (8)
1. F92 mother metal built-up welding cobalt based hard alloy process, it is characterized in that: it may further comprise the steps:
A:, form weldpool at the position that needs built-up welding with the roughing of F92 mother metal;
B:, then, the stainless steel layer of bottoming is disposed with the stainless steel bottoming in the weldpool bottom, kept the F92 and the stainless body that dissolves each other of weldpool bottom;
C: mother metal and welding rod are carried out preheating;
D: welding, from the starting the arc of welding bead center, receive acnode and covered arcing point, and close at the center of weldpool;
E: post weld heat treatment.
2. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1, it is characterized in that: the weldpool among the described step a is annular weldpool, the weldpool degree of depth is 4～5mm.
3. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1, it is characterized in that: stainless steel is A307 among the described step b, the thickness of bottoming is 2～3mm.
4. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1, it is characterized in that: described step C comprises the heating of mother metal: 680 ℃～700 ℃ of (1) preheat temperatures; (2) temperature retention time 1～5h; (3) programming rate＜150 ℃; (4) mode of heating: continuous electric heating.
5. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1 is characterized in that: welding rod is the cobalt base hard alloy welding rod of department too upright 6 or department too upright 12 among the described step c, and core diameter is 4mm.
6. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1 is characterized in that: be 150 ℃～200 ℃ of preheat temperatures to the welding rod preheating among the described step c, and insulation 1h.
7. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1, it is characterized in that: welding current is 190～230A in the described steps d, described welding arc is a short arc, the temperature of welding base metal〉600 ℃.
8. a kind of F92 mother metal built-up welding cobalt based hard alloy process according to claim 1, it is characterized in that: described steps d post weld heat treatment comprises: (1) heating-up temperature: 720 ℃～730 ℃; (2) temperature retention time: 2～4h; (3) programming rate:＜150 ℃/h; (4) mode of heating; Heating continuously; (5) type of cooling: furnace cooling; (6) tapping temperature:＜200 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101202994A CN101367148A (en) | 2007-08-15 | 2007-08-15 | F92 base metal weld deposit cobalt based hard alloy process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007101202994A CN101367148A (en) | 2007-08-15 | 2007-08-15 | F92 base metal weld deposit cobalt based hard alloy process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101367148A true CN101367148A (en) | 2009-02-18 |
Family
ID=40411221
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101202994A Pending CN101367148A (en) | 2007-08-15 | 2007-08-15 | F92 base metal weld deposit cobalt based hard alloy process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101367148A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837499A (en) * | 2010-06-18 | 2010-09-22 | 武汉市琦晟机械有限公司 | Electric welding method for hard alloy and steel |
| CN102518853A (en) * | 2011-11-25 | 2012-06-27 | 南通市电站阀门有限公司 | Overlay welding process for deep holes on valve body sealing surface |
| CN102785065A (en) * | 2012-08-31 | 2012-11-21 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN102974917A (en) * | 2012-11-09 | 2013-03-20 | 哈尔滨汽轮机厂有限责任公司 | Method of gas turbine combustion chamber stellite alloy bead weld |
| CN103350287A (en) * | 2013-08-01 | 2013-10-16 | 南通国电电站阀门有限公司 | F92 valve body and F22 piping dissimilar steel butt-welding technology |
| CN104534165A (en) * | 2014-11-25 | 2015-04-22 | 南通龙源电站阀门有限公司 | Valve seat face surfacing technology |
| CN108161177A (en) * | 2017-12-26 | 2018-06-15 | 江苏利柏特股份有限公司 | A kind of opening conduit end increases the welding technique of cobalt-based stiffening layer |
| CN110744259A (en) * | 2019-11-26 | 2020-02-04 | 西安热工研究院有限公司 | Gradient repairing method for sealing surface of high-pressure main steam valve for thermal power generating unit |
-
2007
- 2007-08-15 CN CNA2007101202994A patent/CN101367148A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101837499A (en) * | 2010-06-18 | 2010-09-22 | 武汉市琦晟机械有限公司 | Electric welding method for hard alloy and steel |
| CN101837499B (en) * | 2010-06-18 | 2011-12-07 | 武汉市琦晟机械有限公司 | Electric welding method for hard alloy and steel |
| CN102518853A (en) * | 2011-11-25 | 2012-06-27 | 南通市电站阀门有限公司 | Overlay welding process for deep holes on valve body sealing surface |
| CN102785065A (en) * | 2012-08-31 | 2012-11-21 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN102785065B (en) * | 2012-08-31 | 2015-01-14 | 南通市电站阀门有限公司 | Process method of solving easily produced cracks in surfacing hard alloy on valve sealing surface |
| CN102974917A (en) * | 2012-11-09 | 2013-03-20 | 哈尔滨汽轮机厂有限责任公司 | Method of gas turbine combustion chamber stellite alloy bead weld |
| CN102974917B (en) * | 2012-11-09 | 2015-03-18 | 哈尔滨汽轮机厂有限责任公司 | Stellite alloy bead weld method of gas turbine combustion chamber |
| CN103350287A (en) * | 2013-08-01 | 2013-10-16 | 南通国电电站阀门有限公司 | F92 valve body and F22 piping dissimilar steel butt-welding technology |
| CN103350287B (en) * | 2013-08-01 | 2016-06-01 | 南通国电电站阀门有限公司 | F92 valve body and F22 join the technique of pipe dissimilar steel jam welding |
| CN104534165A (en) * | 2014-11-25 | 2015-04-22 | 南通龙源电站阀门有限公司 | Valve seat face surfacing technology |
| CN108161177A (en) * | 2017-12-26 | 2018-06-15 | 江苏利柏特股份有限公司 | A kind of opening conduit end increases the welding technique of cobalt-based stiffening layer |
| CN110744259A (en) * | 2019-11-26 | 2020-02-04 | 西安热工研究院有限公司 | Gradient repairing method for sealing surface of high-pressure main steam valve for thermal power generating unit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101367148A (en) | F92 base metal weld deposit cobalt based hard alloy process | |
| CN104385703B (en) | Complex gradient coating that a kind of blade surface is repaired and preparation method thereof | |
| CN103290230B (en) | Preparation method for nickel-based high temperature alloy by using electron beam melting | |
| CN100450689C (en) | Repairing welding method for crack of rotor support power generator | |
| CN105499816A (en) | Manufacturing process suitable for tungsten and steel connection of first wall part of fusion reactor | |
| CN108381027A (en) | It is used to prepare the vacuum welding device and preparation method thereof of carbon equivalent high super-thick steel plate | |
| CN101622365A (en) | Use postweld heat treatment to improve the method for a seam welding performance | |
| CN105880834A (en) | Welding method of Q890 high-strength steel | |
| CN108044221A (en) | A kind of gas flame cuttiug technique of middle, high-carbon steel plate | |
| CN109825675B (en) | Heat exchange tube for fast reactor steam generator and preparation method thereof | |
| CN104209639A (en) | Mold cutting edge repair welding process | |
| CN110773839A (en) | Welding process method for preventing repair welding cracks of nickel-based alloy bent pipe | |
| CN107552961B (en) | A kind of method of LASER BEAM WELDING TiAl alloy | |
| CN113579417A (en) | Defect welding and heat treatment method for heat-resistant steel casting | |
| CN101491828B (en) | Copper steel fusion-casting welding technique | |
| CN106964872A (en) | A kind of manual electric arc welding SMAW deep hole overlaying methods | |
| CN101664848B (en) | Shearing blade bead weld technique of hot shearing die | |
| CN113373293B (en) | Repair welding heat treatment method for inner wall corrosion area of hydrogenation reactor of large-scale chemical equipment | |
| CN102959096A (en) | Treatment of heater tube intended for pressurizer of the primary cooling system of nuclear reactor | |
| CN105648195B (en) | A kind of method for improving thermal treatment quality after P91, P92 high-temperature pipe site welding | |
| CN104751921A (en) | Claw assembly with long service life and production process thereof | |
| CN108000049A (en) | A kind of build-up welding repair method of axle forging swage block | |
| Pleterski et al. | Laser repair welding of molds with various pulse shapes | |
| CN105252109A (en) | Weld crack repair welding method for 30 CrMnSiA welding structural part finished product | |
| CN113020276A (en) | Method for repairing roll shape of section steel roll |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20090218 |