CN102518853A - Overlay welding process for deep holes on valve body sealing surface - Google Patents
Overlay welding process for deep holes on valve body sealing surface Download PDFInfo
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- CN102518853A CN102518853A CN201110380548XA CN201110380548A CN102518853A CN 102518853 A CN102518853 A CN 102518853A CN 201110380548X A CN201110380548X A CN 201110380548XA CN 201110380548 A CN201110380548 A CN 201110380548A CN 102518853 A CN102518853 A CN 102518853A
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Abstract
The invention relates to an overlay welding process for deep holes on a valve body sealing surface. The innovation point of the overlay welding process is that the steps are as follows: drilling out a valve body middle hole extending to the valve body sealing surface from the position of a valve rod hole of the valve body on valve body blank; drilling out concentric process holes, diameter of which is smaller than that of the valve body middle hole, on the bottom part of the valve body middle hole of the valve body blank; carrying out overlay welding of hard alloy on a shaft shoulder surface between the process holes and the valve body middle hole; carrying out thermal treatment to the valve body blank; and finally, machining the sealing surface of the valve body blank; the bottom part of the valve body middle hole is drilled with process holes, so that the hole diameter of the process holes ensures that the welding area achieves the processing width of the overlay welding on the sealing surface; overlay welding is carried out to the annular shaft shoulder surface between the process holes and the valve body middle hole, so that compound stress is reduced to be within a safe range to avoid crackles. The inner wall of the overlay welding layer does not contact with the mother material, so that fusion phenomenon does not exist, and the hardness of the overlay welding layer is ensured, and the sealing performance is ensured. Besides, overlay welding materials on the positions of the process holes are saved, so that welding rods are saved.
Description
Technical field
The present invention relates to a kind of valve body sealing surface deep hole bead-welding technology, the particularly a kind of F92 of employing refractory steel carries out the technology of the artificial built-up welding of sealing surface deep hole as valve body.
Background technique
Stop valve is to use the most a kind of valve, is used for connecting or blocking the medium of pipeline.Its valve body has annular sealing surface one, and this annular sealing surface can cooperate cut-out or the conducting that realizes pipeline medium with valve core sealed cover.Along with the continuous development of China's thermoelectricity cause, utilization overcritical, the ultra supercritical unit is more and more, and F92 refractory steel plays an important role in these units with its excellent performance advantage.The F92 heat-resisting steel material is shorter in the time that China uses, and domestic does not still have relevant standards and norms, and abroad related data to introduce processing range too big, operability is not strong.
Adopting F92 refractory steel as valve body; When valve body sealing surface pile-up welding hard alloy layer, the method that generally adopts is as shown in Figure 1: at first on valve body blank 1, process the valve body mesopore 2 that extends to valve body sealing surface from the valve rod hole position of valve body, valve body mesopore 2; Adopt special-purpose cutting tool to cut the annular stack weld groove in valve body mesopore 2 bottoms; Pile-up welding hard alloy 3 in the built-up welding groove, and its surfacing electrode is D802, again overlay cladding is carried out machining.Because thermal stress, structural stress, welding stress and other stress of valve body blank are higher greater than the probability of F92 material tensile strength, therefore be prone to crack.In addition, because all artificial weldings of employing in weld deposit process of present domestic most valve body manufacturing enterprise are full of smog in the hole during deep hole welding; Visual poor, welding rod palpus spreading leans on welder's individual to feel to operate fully; Carrying out technology can't guarantee at all; Therefore welding quality is unstable, and the fluctuation of quality is bigger, causes product percent of pass low.Need carry out repeatedly repair welding, not only improve cost of production greatly, the manufacture cycle is elongated, repeatedly repair welding must cause the performance depreciation of sealing surface surrounding tissue, not only influences working life, also can stay safety and answer hidden danger.Therefore provide a kind of valve body sealing surface deep hole bead-welding technology of difficult generation built-up welding crackle imperative.
Summary of the invention
The technical problem that the present invention will solve provides the technology that a kind of F92 of employing refractory steel carries out the built-up welding of sealing surface deep hole as valve body and is not prone to the built-up welding crackle.
For solving the problems of the technologies described above; Technological scheme of the present invention is: a kind of valve body sealing surface deep hole bead-welding technology; Its innovative point is that said method step is: bore the valve body mesopore: on the valve body blank, bore the valve body mesopore that a valve rod hole position from valve body extends to valve body sealing surface, this valve body mesopore is a blind hole; Bore auxiliary hole: bore with one heart in the valve body mesopore bottom of valve body blank and diameter less than the auxiliary hole of valve body mesopore; Welding: carry out the built-up welding of cemented carbide at the auxiliary hole of valve body blank and the shaft shoulder face place between the valve body mesopore; Heat treatment: the valve body blank is heat-treated; Machining: the sealing surface to the valve body blank carries out machining.
Further, before said built-up welding operation, at the smoke vent of the valve flowing channel position of valve body blank brill one and auxiliary hole conducting, the smoke-ejecting pipe that said smoke vent interior slotting is communicated with induced draught fan.
Further, in the said heat treatment step, the valve body blank is sent into immediately after accomplishing welding in the electric furnace after 300 ℃ of furnace temperature and the outage and is carried out slow cooling, slow cooling to 100 ℃, 2-3 hour slow cooling time; Be warming up to 730-780 ℃ with the speed that is no more than 150 ℃/h again; Be incubated after 4-5 hour, be cooled to 300 ℃ with the speed that is no more than 150 ℃/h; After being cooled to below 300 ℃, can opening fire door and be cooled to again below 100 ℃ and can come out of the stove.
The invention has the advantages that: bore auxiliary hole in valve body mesopore bottom; The working width that auxiliary hole aperture assurance welding area reaches sealing surface weld deposit gets final product; Annular shaft shoulder face between auxiliary hole and the valve body mesopore carries out built-up welding; Make the overlay cladding internal stress can access release, fundamentally combined stress is dropped within the relatively safer scope, avoid the generation of crackle.And the inwall of overlay cladding does not contact with mother metal, does not have the fusion phenomenon, guarantees the hardness of overlay cladding, guarantees sealability.In addition, saved the resurfacing welding material of auxiliary hole position, it is nearly 2/3 to practice thrift welding rod, has reduced cost of production.
When carrying out the manual work welding, can be before built-up welding, the smoke vent of brill and auxiliary hole conducting in the valve flowing channel position; The flue gas that produces during welding passes through smoke vent by the induced draught fan sucking-off; For welding provides the good visual field, improve welding condition, the execution of technology is guaranteed during welding.After carrying out repeatedly small lot checking production testing, first-time qualification rate is high, has improved manufacturing efficiency, has reduced enterprise's manufacture cost.
In heat treatment step; The valve body blank is sent into electric furnace immediately and is carried out slow cooling to 100 ℃ after accomplishing welding; Insulation is 4-5 hour after being warming up to 730-780 ℃, opens fire door after being cooled to 300 ℃ with stove and is cooled to below 100 ℃ and comes out of the stove, and can reduce welding heat stress, structural stress, assurance structural transformation to greatest extent fully, fully; Avoid quenched martensite to appear at, further improve first-time qualification rate through on the weldment of postweld heat treatment.
Description of drawings
Fig. 1 is traditional valve seal surface build-up welding schematic representation.
Fig. 2 is for being drilled with the valve body structure schematic representation of valve body mesopore among the present invention.
Fig. 3 is for boring the valve body structure schematic representation of auxiliary hole among the present invention.
Fig. 4 is valve seal surface build-up welding schematic representation among the present invention.
Fig. 5 for valve seal surface build-up welding among the present invention after structural representation.
Embodiment
Concrete steps are:
At first bore the valve body mesopore: as shown in Figure 2, on valve body blank 1, bore the valve body mesopore 2 that a valve rod hole position from valve body extends to valve body sealing surface A, this valve body mesopore 2 is a blind hole, the pore size of this valve body mesopore 2 requires to leave certain surplus to follow-up machining.
Bore auxiliary hole then: as shown in Figure 3; Bore at the sealing surface A place of valve body mesopore 2 bottoms of valve body blank 1 one with one heart and diameter less than the auxiliary hole 4 of valve body mesopore 2, these auxiliary hole 4 apertures guarantee that welding area reaches the working width of sealing surface weld deposit and requires to give follow-up machining to leave certain surplus.
Smoke discharging structure is set: as shown in Figure 4, at the smoke vent 5 of the valve flowing channel position of valve body blank 1 brill one and auxiliary hole 4 conductings.In smoke vent 5, insert the smoke-ejecting pipe that is communicated with induced draught fan.
And then weld: at the auxiliary hole 4 of valve body blank 1 and the shaft shoulder face place between the valve body mesopore 2 is that sealing surface A place carries out the built-up welding of cemented carbide 3, and welding rod material is D802.
Welding is heat-treated after accomplishing: valve body blank 1 is after accomplishing welding, and temperature is sent into immediately and carried out slow cooling to 100 ℃ in the electric furnace after 300 ℃ of furnace temperature and the outage about 300-450 ℃.Owing to the Martensitic transformation end temp Mf of F92 material under different cool conditions is minimum is 105 ℃, is chilled to 100 ℃, can guarantee that undercooled austenite all can satisfy changing condition.The slow cooling time is 2-3 hour, and undercooled austenite transformation amount reaches more than 99% in this time period, if the slow cooling time less than 2 hours, then undercooled austenite transformation amount is less than 80%, the slow cooling overlong time then lowers efficiency.
Be warming up to 730-780 ℃ after the slow cooling, in 730-780 ℃ temperature range, temperature is high more, and residual stress is low more.Be incubated after 4-5 hour, be cooled to below 300 ℃.This stage warming velocity and rate of cooling must strictly be controlled in≤150 ℃/h, avoid new thermal stress to form the probability that causes cracking and strengthen.After valve body blank 1 is cooled to below 300 ℃, because electric furnace is extremely slow 300 ℃ of following cooling rates, far away≤150 ℃/h, be to shorten the manufacture cycle, can open fire door this moment and accelerate can come out of the stove below the rate of cooling to 100 ℃.
Carry out machining at last: the sealing surface to the valve body blank carries out rough turn processing and finish turning processing.
Claims (3)
1. valve body sealing surface deep hole bead-welding technology is characterized in that said method step is:
A. bore the valve body mesopore: on the valve body blank, bore the valve body mesopore that a valve rod hole position from valve body extends to valve body sealing surface, this valve body mesopore is a blind hole;
B. bore auxiliary hole: bore with one heart in the valve body mesopore of valve body blank bottom and diameter less than the auxiliary hole of valve body mesopore;
C. welding: carry out the built-up welding of cemented carbide at the auxiliary hole of valve body blank and the shaft shoulder face place between the valve body mesopore;
D. heat treatment: the valve body blank is heat-treated;
E. machining: the sealing surface to the valve body blank carries out machining.
2. valve body sealing surface deep hole bead-welding technology according to claim 1; It is characterized in that: before said built-up welding operation; At the smoke vent of the valve flowing channel position of valve body blank brill one and auxiliary hole conducting, the smoke-ejecting pipe that said smoke vent interior slotting is communicated with induced draught fan.
3. valve body sealing surface deep hole bead-welding technology according to claim 1; It is characterized in that: in the said heat treatment step; The valve body blank is sent into immediately after accomplishing welding in the electric furnace after 300 ℃ of furnace temperature and the outage and is carried out slow cooling, slow cooling to 100 ℃, 2-3 hour slow cooling time; Be warming up to 730-780 ℃ with the speed that is no more than 150 ℃/h again; Be incubated after 4-5 hour, be cooled to 300 ℃ with the speed that is no more than 150 ℃/h; After being cooled to below 300 ℃, can opening fire door and be cooled to again below 100 ℃ and can come out of the stove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110380548XA CN102518853A (en) | 2011-11-25 | 2011-11-25 | Overlay welding process for deep holes on valve body sealing surface |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110380548XA CN102518853A (en) | 2011-11-25 | 2011-11-25 | Overlay welding process for deep holes on valve body sealing surface |
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| CN102518853A true CN102518853A (en) | 2012-06-27 |
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| CN201110380548XA Pending CN102518853A (en) | 2011-11-25 | 2011-11-25 | Overlay welding process for deep holes on valve body sealing surface |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| CN104723112A (en) * | 2013-12-20 | 2015-06-24 | 大连津利流体设备开发有限公司 | Production method of multifunctional double-block sampling instrument root valve body with support |
| CN104816093A (en) * | 2015-05-20 | 2015-08-05 | 上海交通大学 | Manufacturing method for deep hole bottom sealing surface laser cladding of valve body part |
| CN105382386A (en) * | 2015-12-24 | 2016-03-09 | 南通市电站阀门有限公司 | Air-cooled type automatic welding gun with bottom build up welding |
| CN105562890A (en) * | 2016-03-01 | 2016-05-11 | 中国兵器科学研究院宁波分院 | Welding method applicable to small-diameter deep blind hole |
| CN105773071A (en) * | 2015-11-27 | 2016-07-20 | 南通市电站阀门有限公司 | Assembly method of valve seat of small-diameter gate valve |
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| JPH02296081A (en) * | 1989-05-09 | 1990-12-06 | Toshiba Corp | Manufacture of valve |
| US5826336A (en) * | 1994-08-23 | 1998-10-27 | Johnson Service Company | Process for the production of series-produced valves used in heating, ventilating and air-conditioning systems |
| CN101367148A (en) * | 2007-08-15 | 2009-02-18 | 南通龙源电站阀门有限公司 | F92 base metal weld deposit cobalt based hard alloy process |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN104723112A (en) * | 2013-12-20 | 2015-06-24 | 大连津利流体设备开发有限公司 | Production method of multifunctional double-block sampling instrument root valve body with support |
| 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 |
| CN104816093A (en) * | 2015-05-20 | 2015-08-05 | 上海交通大学 | Manufacturing method for deep hole bottom sealing surface laser cladding of valve body part |
| CN105773071A (en) * | 2015-11-27 | 2016-07-20 | 南通市电站阀门有限公司 | Assembly method of valve seat of small-diameter gate valve |
| CN105382386A (en) * | 2015-12-24 | 2016-03-09 | 南通市电站阀门有限公司 | Air-cooled type automatic welding gun with bottom build up welding |
| CN105562890A (en) * | 2016-03-01 | 2016-05-11 | 中国兵器科学研究院宁波分院 | Welding method applicable to small-diameter deep blind hole |
| CN105562890B (en) * | 2016-03-01 | 2018-02-27 | 中国兵器科学研究院宁波分院 | A kind of welding method suitable for small-diameter deep blind hole |
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Application publication date: 20120627 |