CN106975830B - A kind of valve disc multiple location plasma spray stellite process - Google Patents
A kind of valve disc multiple location plasma spray stellite process Download PDFInfo
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- CN106975830B CN106975830B CN201710366209.3A CN201710366209A CN106975830B CN 106975830 B CN106975830 B CN 106975830B CN 201710366209 A CN201710366209 A CN 201710366209A CN 106975830 B CN106975830 B CN 106975830B
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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
- B23K10/00—Welding or cutting by means of a plasma
- B23K10/02—Plasma welding
- B23K10/027—Welding for purposes other than joining, e.g. build-up welding
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Abstract
The invention discloses a kind of surfacing stellite process, especially a kind of valve disc multiple location plasma spray stellite process belongs to welding technique technical field.The present invention is the following steps are included: step 1, the inner headed face for waiting for valve disc surfacing, inner conical surface and male cone (strobilus masculinus) carry out plasma spray stellite；Step 2 carries out the destressing heat treatment of first time postwelding to valve disc；Step 3, the outer end face for waiting for valve disc surfacing, outer big disc, outer small disc carry out plasma spray stellite；Step 4 carries out second of postwelding destressing heat treatment to valve disc.Present invention process process is simple, it can be improved working efficiency, reduce production cost, by rationally weld and heat treatment process sequence, in conjunction with the welding condition to match, can be realized the surfacing stellite directly on each face of weld to be painted of valve disc, it can be avoided and weld crack occur, and the good toughness of heat affected area, rate of dilution is low, and weld is accepted rate is high.
Description
Technical field
The present invention relates to a kind of surfacing stellite process, especially a kind of valve disc multiple location plasma spray department
Too vertical alloying technology method, belongs to welding technique technical field.
Background technique
As the operating temperature of steam turbine valve is higher and higher, heat-resisting steel material is anticorrosive, anti-under service condition at present
Oxidation, wear resistance have been difficult to meet requirement.Wherein, in super-critical and ultra super-critical power unit valve, valve is opened
Core member multiple positions are frequently moved when conjunction to require to reach anti-oxidant, wear-resistant, anticorrosive, shock resistance.In order to reduce
Cost, valve surface stellite are a kind of most effective, most economical modes.
But since steam turbine valve disc material is mainly heat resisting steel, such as 2Cr12NiMoVNb, F91, F92, weldability
Difference, it is easy to crack, and also stellite weldability is also poor, easily cracks.Bead-welding technology is with austenite wlding bottoming, so at present
Built-up welding stellite again afterwards, this is because stellite welding performance is poor, it is easy to crack, and surfacing stellite layer is not permitted
Permitted have crackle, so all reaching the overlaying method of flawless simply by built-up welding austenite wlding at present.
But the position of built-up welding stellite is needed to have six complicated valve disc components, such as a certain valve disc
Inner conical surface that inner headed face that a face, i.e. diameter are 50mm, end diameter are 50mm, outside diameter are that 260mm male cone (strobilus masculinus), big end are straight
Diameter is 260mm outer end face, diameter is that big disc and diameter are small disc outside 70mm outside 220mm.If the valve disc is still using first difficult to understand
Family name's body wlding bottoming, then the technique of built-up welding stellite, it will there is at least ten built-up welding repeatedly, repeatedly clamping, technique
Process will be extremely complex, and the bad problem of cracking, surfacing quality easily occurs in built-up welding repeatedly and exist.
The shortcomings that in order to overcome current steam turbine valve disc seal surface build-up welding technology, if process flow is complicated, inefficiency,
Dilution rate is high, and qualification rate is low, while the defects of in order to avoid crackle, the present invention proposes to use multiposition plasma spray Si Taili
The process of alloy.
Summary of the invention
Goal of the invention of the invention is: in view of the above problems, providing a kind of valve disc multiple location plasma spray
Stellite process, present invention process process is simple, can be improved working efficiency, production cost is reduced, by reasonable
Welding and heat treatment process sequence, in conjunction with the welding condition to match, can be realized directly on each face of weld to be painted of valve disc
Surfacing stellite can be avoided and weld crack occurs, and the good toughness of heat affected area, and rate of dilution is low, and weld seam closes
Lattice rate is high.
The technical solution adopted by the invention is as follows:
A kind of valve disc multiple location plasma spray stellite process, comprising the following steps:
Step 1, the inner headed face for waiting for valve disc surfacing, inner conical surface and male cone (strobilus masculinus) carry out plasma spray stellite,
In,
The welding condition of inner headed face are as follows: transfer arc current 50-130A, transfer arc voltage 15-25V, speed of welding 60-
150mm/min, alloy powder give speed 10-30g/min, swing width 4-15mm,
The welding condition of inner conical surface are as follows: transfer arc current 100-200A, transfer arc voltage 20-30V, speed of welding
60-150mm/min, alloy powder give speed 15-50g/min,
The welding condition of male cone (strobilus masculinus) are as follows: transfer arc current 100-300A, transfer arc voltage 30-40V, speed of welding
40-150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm；
Step 2 carries out the destressing heat treatment of first time postwelding to valve disc；
Step 3, the outer end face for waiting for valve disc surfacing, outer big disc, outer small disc carry out plasma spray stellite,
Wherein,
The welding condition of outer end face, outer big disc are as follows: transfer arc current 100-300A, transfer arc voltage 30-40V,
Speed of welding 40-150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm,
The welding condition of outer small disc are as follows: transfer arc current≤120A, transfer arc voltage≤25V, speed of welding 40-
150mm/min, alloy powder give speed≤30g/min, swing width≤15mm；
Step 4 carries out second of postwelding destressing heat treatment to valve disc.
Valve disc waits for that overlaying surface has 6 to surfacing, sub-category are as follows: inner headed face, inner conical surface, male cone (strobilus masculinus), outer end face, outer great circle
Face, outer small disc.When by adopting the above technical scheme, the inner headed face of step 1, the surfacing of inner conical surface and male cone (strobilus masculinus) are completed first, so
The first time post weld heat treatment in step 2 is carried out afterwards, then carries out the outer end face, outer big disc and outer small disc surfacing of step 3, most
Second of post weld heat treatment in step 4 is carried out afterwards.By the first time heat treatment operation in step 2, can eliminate in time because
Surfacing operation in step 1 and the welding stress generated, it is ensured that when carrying out the surfacing operation in step 3, weld crack do not occur；
Have benefited from the welding condition to match with each valve disc face of weld to be painted simultaneously, realization is directly sprayed on each face of weld to be painted of valve disc
Stellite is welded, while avoiding the occurrence of weld crack.If without step 2, when the complete inner headed face of surfacing, inner conical surface and male cone (strobilus masculinus)
Afterwards, larger welding stress will be present inside valve disc, and stress is not released, if that continuing surfacing outer end face, outer great circle
Face, outer small disc, then inner headed face, inner conical surface, male cone (strobilus masculinus), outer end face, outer big disc or outer small disc is any one or more
Weld crack will easily occur in overlaying surface.Present invention process process is simple, can be improved working efficiency, reduces production cost,
By rationally weld and heat treatment process sequence, in conjunction with the welding condition to match, can be realized directly valve disc respectively to
Surfacing stellite on surfacing face, can be avoided and weld crack occur, and the good toughness of heat affected area, rate of dilution
Low, weld is accepted rate is high.
Specifically, the swing width of inner conical surface surfacing is the conical surface width of inner conical surface in step 1.Because of general inner conical surface
Width it is smaller, therefore can be using the process that disposably finishes inner conical surface surfacing.
Further, before step 1, further comprising the steps of between step 2 and step 3: valve disc to be clamped in turnable
Positioner on；Adjusting positioner makes the face of weld to be painted of valve disc be in horizontality.Can according to demand by valve disc it is any to
Surfacing face is adjusted to horizontality, surfacing operation convenient to carry out.
Further, before step 1, further comprising the steps of between step 2 and step 3: to the face of weld to be painted of valve disc into
Row preheating, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min.It can reduce weld seam cooling velocity, prevent to harden
Tissue reduces welding stress, avoids generating weld crack.
Further, further comprising the steps of between step 1 and step 2, between step 3 and step 4: the spray to valve disc
Heat after the face of weld carries out, 350 DEG C -600 DEG C of postheat temperature, soaking time >=30min.It can reduce weld seam cooling velocity, prevent from producing
Raw hardened structure, reduces welding stress, avoids generating weld crack.
Further, step 1, in step 3, protective gas and ion-gas are argon gas, purity >=99.99% of argon gas.
Further, step 1, in step 3, temperature is 350 DEG C -600 DEG C between road.
Further, step 1, in step 3, surfacing mode is that annular welds or spiral shape are welded.Preferably, conical surface width is smaller
Inner conical surface be disposably soldered using annular welds, weld seam is annular in shape；And remaining each face of weld to be painted uses the welding side of spiral shape weldering
Formula disposable surfacing can finish respectively, and weld seam is in the shape of a spiral.
Further, step 1, in step 3, surfacing inner headed face uses gun body diameter≤26mm Hole plasma welding
Rifle, surfacing inner conical surface use 45° angle degree Hole plasma welding rifle, surfacing male cone (strobilus masculinus), outer end face, outer big disc and outer small disc
Using outer circle plasma spray welding gun.The present invention waits surfacings system to carry dedicated plasma spray welding gun using multi-functional, respectively to valve
Each face of weld to be painted of dish carries out plasma spray stellite powder.
Further, step 2, in step 4, the heat treatment of the valve disc is tempering heat treatment, tempering temperature 600-760
DEG C, soaking time 6-8h, heating rate≤75 DEG C/h, cooling rate≤75 DEG C/h, valve disc tapping temperature≤150 DEG C.It can
Welding stress is eliminated to the full extent.
Further, each face of weld size to be painted of the valve disc are as follows: the diameter of inner headed face is 30-80mm, the small end of inner conical surface
Diameter is 30-80mm, cone angle is 30 ° -60 °, and outside diameter >=200mm, the cone angle of male cone (strobilus masculinus) are 30 ° -60 °, outside
Outside diameter >=200mm of end face, diameter >=150mm of outer big disc, diameter≤100mm of outer small disc.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
A kind of valve disc multiple location plasma spray stellite process of the invention, process flow is simple, can
Improve working efficiency, reduce production cost, by rationally weld and heat treatment process sequence, in conjunction with match welding procedure ginseng
Number, can be realized the surfacing stellite directly on each face of weld to be painted of valve disc, can be avoided and weld crack occur, and hot shadow
The good toughness in area is rung, rate of dilution is low, and weld is accepted rate is high.
Detailed description of the invention
Examples of the present invention will be described by way of reference to the accompanying drawings, in which:
Fig. 1 is the structural schematic diagram of the valve disc face of weld to be painted.
Marked in the figure: big disc outside 1- inner headed face, 2- inner conical surface, 3- male cone (strobilus masculinus), 4- outer end face, 5-, small disc outside 6-.
Specific embodiment
All features disclosed in this specification or disclosed all methods or in the process the step of, in addition to mutually exclusive
Feature and/or step other than, can combine in any way.
Any feature disclosed in this specification unless specifically stated can be equivalent or with similar purpose by other
Alternative features are replaced.That is, unless specifically stated, each feature is an example in a series of equivalent or similar characteristics
?.
As shown in Figure 1, a kind of valve disc multiple location plasma spray stellite process of the present embodiment, including with
Lower step:
Step 1, the inner headed face 1 for waiting for valve disc surfacing, inner conical surface 2 and male cone (strobilus masculinus) 3 carry out plasma spray stellite,
Wherein,
The welding condition of inner headed face 1 are as follows: transfer arc current 50-130A, transfer arc voltage 15-25V, speed of welding
60-150mm/min, alloy powder give speed 10-30g/min, swing width 4-15mm,
The welding condition of inner conical surface 2 are as follows: transfer arc current 100-200A, transfer arc voltage 20-30V, speed of welding
60-150mm/min, alloy powder give speed 15-50g/min,
The welding condition of male cone (strobilus masculinus) 3 are as follows: transfer arc current 100-300A, transfer arc voltage 30-40V, speed of welding
40-150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm；
Step 2 carries out the destressing heat treatment of first time postwelding to valve disc；
Step 3, the outer end face 4 for waiting for valve disc surfacing, outer big disc 5, outer small disc 6 carry out plasma spray Si Taili conjunction
Gold, wherein
The welding condition of outer end face 4, outer big disc 5 are as follows: transfer arc current 100-300A, transfer arc voltage 30-
40V, speed of welding 40-150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm,
The welding condition of outer small disc 6 are as follows: transfer arc current≤120A, transfer arc voltage≤25V, speed of welding
40-150mm/min, alloy powder give speed≤30g/min, swing width≤15mm；
Step 4 carries out second of postwelding destressing heat treatment to valve disc.
As shown in Figure 1, the valve disc of the present embodiment waits for that overlaying surface has 6 to surfacing, it is sub-category are as follows: inner headed face 1, inner conical surface
2, male cone (strobilus masculinus) 3, outer end face 4, outer big disc 5, outer small disc 6.When using above-mentioned process, the inner circle of step 1 is completed first
Face 1, inner conical surface 2 and male cone (strobilus masculinus) 3 surfacing, then carry out the first time post weld heat treatment in step 2, then carry out the outer of step 3
End face 4, outer big disc 5 and outer 6 surfacing of small disc finally carry out second of post weld heat treatment in step 4.By in step 2
First time heat treatment operation, the welding stress generated by the surfacing operation in step 1 can be eliminated in time, it is ensured that walked
When surfacing operation in rapid 3, there is not weld crack；Have benefited from the welding procedure to match with each valve disc face of weld to be painted simultaneously
Parameter realizes the surfacing stellite directly on each face of weld to be painted of valve disc, while avoiding the occurrence of weld crack.If do not walked
Rapid 2, behind the complete inner headed face 1 of surfacing, inner conical surface 2 and male cone (strobilus masculinus) 3, larger welding stress will be present inside valve disc, and stress does not obtain
To release, if that continue surfacing outer end face 4, outer big disc 5, outer small disc 6, then inner headed face 1, inner conical surface 2, male cone (strobilus masculinus) 3,
Weld crack will easily occur in any one or more overlaying surfaces of outer end face 4, outer big disc 5 or outer small disc 6.The present invention
Process flow is simple, can be improved working efficiency, reduces production cost, by rationally welding and heat treatment process sequence, in conjunction with
The welding condition to match can be realized the surfacing stellite directly on each face of weld to be painted of valve disc, can be avoided out
Existing weld crack, and the good toughness of heat affected area, rate of dilution is low, and weld is accepted rate is high.
Specifically, the swing width of 2 surfacing of inner conical surface is the conical surface width of inner conical surface 2 in step 1.Because of general inner cone
The width in face 2 is smaller, general≤30mm, therefore can be using the process for disposably finishing 2 surfacing of inner conical surface.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: clear up valve disc to surfacing
Face.Surfacing face face is treated before surfacing to be cleared up, grinder buffing can be used, and acetone or other solvents clean the face of weld to be painted, protect
The face of weld to be painted is demonstrate,proved without iron rust, moisture, greasy dirt or other impurities.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: valve disc, which is clamped in, to be turned over
On the positioner turned；Adjusting positioner makes the face of weld to be painted of valve disc be in horizontality.It can be according to demand by any of valve disc
The face of weld to be painted is adjusted to horizontality, surfacing operation convenient to carry out.For example, before surfacing inner conical surface 2, by positioner by inner conical surface
2 overturnings carry out the surfacing of downhand position convenient for inner conical surface 2 to horizontality.It is well known that in flat, horizontal, vertical, overhead welding, downhand welding side
The welding of formula is the most convenient, and welding quality is preferably also, moreover, for built-up welding, downhand welding is its only selection.For another example, it sprays
Before welding outer end face 4, interior outer end face 4 is overturn to horizontality by positioner, the spray of downhand position is carried out convenient for outer end face 4
Weldering.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: to the face of weld to be painted of valve disc
It is preheated, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min.It can reduce weld seam cooling velocity, prevent to quench
Sclerous tissues reduce welding stress, avoid generating weld crack.Preheating can be the entirety preheating to valve disc, and it is only right to be also possible to
The preheating of the face of weld to be painted.Preferably, step 1, in step 3, surfacing operation is disposably completed.It is broken when connecing in the middle, valve disc is answered
Heat preservation or rear hot measure are taken in time, again when welding, still need to be preheated by former preheating requirement.
In implementation steps: valve disc is clamped on turnover positioner；Adjusting positioner makes at the face of weld to be painted of valve disc
In horizontality；The face of weld to be painted of valve disc is preheated, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min；Only needle
For the combination of above-mentioned steps.Process sequence can be, process sequence one: valve disc being clamped in turnover positioner first
On；Then adjusting positioner makes the face of weld to be painted of valve disc be in horizontality, finally preheats to the face of weld to be painted of valve disc, in advance
350 DEG C -600 DEG C of hot temperature, soaking time >=30min.It is also possible that process sequence two: being first clamped in valve disc turnable
Positioner on；Then the face of weld to be painted of valve disc is preheated, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min；
Finally adjusting positioner makes the face of weld to be painted of valve disc be in horizontality.Above two process sequence all can be used as best embodiment party
Formula, in comparison, process sequence two are best, keep pre- hot work more flexible.Certain process sequence is also possible that process sequence
Three: the face of weld to be painted of valve disc being preheated first, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min, then by valve
Dish is clamped on turnover positioner；Finally adjusting positioner makes the face of weld to be painted of valve disc be in horizontality.For technique
Sequentially three, it is most worthless process sequence for those skilled in the art, because during actual job, warp
The valve disc temperature for crossing preheating is very high, and clamping is extremely inconvenient to positioner, and there is the security risk being burned.
In the present embodiment, between step 1 and step 2, further comprising the steps of between step 3 and step 4: to valve disc
Heat after surfacing face carries out, 350 DEG C -600 DEG C of postheat temperature, soaking time >=30min.After heat can be the entirety to valve disc afterwards
Heat is also possible to only to the rear heat in surfacing face.It can reduce weld seam cooling velocity, prevent hardened structure, reduce welding
Stress avoids generating weld crack.I.e. after step 1, immediately to the surfacing face of valve disc, i.e. inner headed face 1,2 and of inner conical surface
Heat after male cone (strobilus masculinus) 3 carries out；After step 1, immediately to the surfacing face of valve disc, i.e. outer end face 4, outer big disc 5 or outer roundlet
Heat after face 6 carries out.
In the present embodiment, in step 1, step 3, untransferable arc electric current is 20-50A.
In the present embodiment, in step 1, step 3, protective gas and ion-gas are argon gas, purity >=99.99% of argon gas.
In the present embodiment, in step 1, step 3, temperature is 350 DEG C -600 DEG C between road.
In the present embodiment, in step 1, step 3, surfacing mode is that annular welds or spiral shape are welded.Preferably, conical surface width compared with
Small inner conical surface 2 is disposably soldered using annular welds, and weld seam is annular in shape, realizes single track single layer welding or single track multilayer according to demand
Weldering；And remaining each face of weld to be painted uses the welding manner of spiral shape weldering, disposable surfacing can finish respectively, weld seam is helically
Shape realizes multiple tracks single layer welding or multiple tracks multilayer welding according to demand.Certainly, inner conical surface 2 can also using spiral shape weld, remaining respectively to
Surfacing face can also use annular welds.
In the present embodiment, in step 1, step 3, surfacing inner headed face 1 uses gun body diameter≤26mm inner hole plasma spray
Welding gun, surfacing inner conical surface 2 use 45° angle degree Hole plasma welding rifle, surfacing male cone (strobilus masculinus) 3, outer end face 4, outer big disc 5 and outer
Small disc 6 uses outer circle plasma spray welding gun.The present invention waits surfacings system to carry dedicated plasma spray welding gun using multi-functional, point
The other face of weld to be painted each to valve disc carries out plasma spray stellite powder.
In the present embodiment, in step 2, step 4, the heat treatment of the valve disc is tempering heat treatment, tempering temperature 600-760
DEG C, soaking time 6-8h, heating rate≤75 DEG C/h, cooling rate≤75 DEG C/h, valve disc tapping temperature≤150 DEG C.It can
Welding residual stress is eliminated to the full extent.
In the present embodiment, the valve disc is made of heat-resisting steel material.Such as 2Cr12NiMoVNb, F91 or F92.
In the present embodiment, each face of weld size to be painted of valve disc are as follows: the diameter of inner headed face 1 is 30-80mm, inner conical surface 2
End diameter is 30-80mm, cone angle is 30 ° -60 °, outside diameter >=200mm of male cone (strobilus masculinus) 3, cone angle be 30 ° -
60 °, outside diameter >=200mm of outer end face 4, diameter >=150mm of outer big disc 5, diameter≤100mm of outer small disc 6.
Specifically, embodiment 1:
As shown in Fig. 1, the present embodiment is by taking following valve discs as an example.Wherein each face of weld size to be painted of valve disc are as follows: inner headed face 1
Diameter is 30mm, and the end diameter of inner conical surface 2 is 30mm, cone angle is 30 °, inner conical surface width is 18mm, male cone (strobilus masculinus) 3 it is big
End diameter is 200mm, cone angle is 30 °, and the outside diameter of outer end face 4 is 200mm, and the diameter of outer big disc 5 is 150mm,
The diameter of outer small disc 6 is 40mm.
As shown in Figure 1, a kind of valve disc multiple location plasma spray stellite process of the present embodiment, including with
Lower step:
Step 1, the inner headed face 1 for waiting for valve disc surfacing, inner conical surface 2 and male cone (strobilus masculinus) 3 carry out plasma spray stellite,
Wherein,
The welding condition of inner headed face 1 are as follows: transfer arc current 50-70A, transfer arc voltage 15V, speed of welding 60mm/
Min, alloy powder give speed 10g/min, swing width 4mm,
The welding condition of inner conical surface 2 are as follows: transfer arc current 100-120A, transfer arc voltage 20V, speed of welding
60mm/min, alloy powder give speed 15g/min, swing width 18mm,
The welding condition of male cone (strobilus masculinus) 3 are as follows: transfer arc current 100-120A, transfer arc voltage 30V, speed of welding
40mm/min, alloy powder give speed 30g/min, swing width 10mm；
Step 2 carries out the destressing heat treatment of first time postwelding to valve disc；
Step 3, the outer end face 4 for waiting for valve disc surfacing, outer big disc 5, outer small disc 6 carry out plasma spray Si Taili conjunction
Gold, wherein
The welding condition of outer end face 4, outer big disc 5 are as follows: transfer arc current 100-120A, transfer arc voltage 30V, weldering
Meet speed 40mm/min, alloy powder gives speed 30g/min, swing width 10mm,
The welding condition of outer small disc 6 are as follows: transfer arc current 90-100A, transfer arc voltage 18V, speed of welding
40mm/min, alloy powder give speed 18g/min, swing width 10mm；
Step 4 carries out second of postwelding destressing heat treatment to valve disc.
It will be evident that step 1 can be exchanged with each other with step 3, the present embodiment is as preferred embodiment.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: clear up valve disc to surfacing
Face.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: valve disc, which is clamped in, to be turned over
On the positioner turned；Adjusting positioner makes the face of weld to be painted of valve disc be in horizontality.
In the present embodiment, before step 1, further comprising the steps of between step 2 and step 3: to the face of weld to be painted of valve disc
It is preheated, 350 DEG C -600 DEG C of preheating temperature, soaking time >=30min.
In the present embodiment, between step 1 and step 2, further comprising the steps of between step 3 and step 4: to valve disc
Heat after surfacing face carries out, 350 DEG C -600 DEG C of postheat temperature, soaking time >=30min.
In the present embodiment, in step 1, step 3, the untransferable arc electric current of inner headed face 1 and inner conical surface 2 is 20-30A, outer cone
The untransferable arc electric current of face 3, outer end face 4 and outer big disc 5 and outer small disc 6 is 30-50A.
In the present embodiment, in step 1, step 3, protective gas and ion-gas are argon gas, purity >=99.99% of argon gas.
In the present embodiment, in step 1, step 3, temperature is 350 DEG C -600 DEG C between road.
In the present embodiment, in step 1, step 3, surfacing mode is that annular welds or spiral shape are welded.Specifically, inner conical surface 2 is adopted
Use annular welds；Remaining each face of weld to be painted is welded using spiral shape.
In the present embodiment, in step 1, step 3, surfacing inner headed face 1 uses gun body diameter≤26mm inner hole plasma spray
Welding gun, surfacing inner conical surface 2 use 45° angle degree Hole plasma welding rifle, surfacing male cone (strobilus masculinus) 3, outer end face 4, outer big disc 5 and outer
Small disc 6 uses outer circle plasma spray welding gun.
In the present embodiment, in step 2, step 4, the heat treatment of the valve disc is tempering heat treatment, tempering temperature 600-760
DEG C, soaking time 6-8h, heating rate≤38 DEG C/h, cooling rate≤38 DEG C/h, valve disc tapping temperature≤150 DEG C.
In the present embodiment, the valve disc is made of heat-resisting steel material.Such as 2Cr12NiMoVNb, F91 or F92.
Embodiment 2:
The present embodiment is substantially the same manner as Example 1, the difference is that:
As shown in Fig. 1, the present embodiment is by taking following valve discs as an example.Wherein each face of weld size to be painted of valve disc are as follows: inner headed face 1
Diameter is 50mm, and the end diameter of inner conical surface 2 is 50mm, cone angle is 45 °, inner conical surface width is 20mm, male cone (strobilus masculinus) 3 it is big
End diameter is 260mm, cone angle is 45 °, and the outside diameter of outer end face 4 is 260mm, and the diameter of outer big disc 5 is 220mm,
The diameter of outer small disc 6 is 70mm.
In the present embodiment, in step 1,
The welding condition of inner headed face 1 are as follows: transfer arc current 100-120A, transfer arc voltage 22V, speed of welding
80mm/min, alloy powder give speed 18g/min, swing width 10mm,
The welding condition of inner conical surface 2 are as follows: transfer arc current 140-160A, transfer arc voltage 25V, speed of welding
80mm/min, alloy powder give speed 30g/min, swing width 20mm,
The welding condition of male cone (strobilus masculinus) 3 are as follows: transfer arc current 200-210A, transfer arc voltage 32V, speed of welding
55mm/min, alloy powder give speed 48g/min, swing width 48mm；
In the present embodiment, in step 3,
The welding condition of outer end face 4 are as follows: transfer arc current 200-210A, transfer arc voltage 32V, speed of welding
55mm/min, alloy powder give speed 48g/min, swing width 48mm,
The welding condition of outer big disc 5 are as follows: transfer arc current 210-220A, transfer arc voltage 34V, speed of welding
100mm/min, alloy powder give speed 55g/min, swing width 18mm,
The welding condition of outer small disc 6 are as follows: transfer arc current 100-110A, transfer arc voltage 23V, speed of welding
85mm/min, alloy powder give speed 20g/min, swing width 12mm.
Embodiment 3:
The present embodiment is substantially the same manner as Example 1, the difference is that:
As shown in Fig. 1, the present embodiment is by taking following valve discs as an example.Wherein each face of weld size to be painted of valve disc are as follows: inner headed face 1
Diameter is 80mm, and the end diameter of inner conical surface 2 is 80mm, cone angle is 60 °, inner conical surface width is 30mm, male cone (strobilus masculinus) 3 it is big
End diameter is 400mm, cone angle is 60 °, and the outside diameter of outer end face 4 is 400mm, and the diameter of outer big disc 5 is 350mm,
The diameter of outer small disc 6 is 100mm.
In the present embodiment, in step 1,
The welding condition of inner headed face 1 are as follows: transfer arc current 120-130A, transfer arc voltage 25V, speed of welding
150mm/min, alloy powder give speed 30g/min, swing width 15mm,
The welding condition of inner conical surface 2 are as follows: transfer arc current 180-200A, transfer arc voltage 30V, speed of welding
150mm/min, alloy powder give speed 50g/min, swing width 30mm,
The welding condition of male cone (strobilus masculinus) 3 are as follows: transfer arc current 280-300A, transfer arc voltage 40V, speed of welding
150mm/min, alloy powder give speed 60g/min, swing width 50mm；
In the present embodiment, in step 3,
The welding condition of outer end face 4, outer big disc 5 are as follows: transfer arc current 280-300A, transfer arc voltage 40V, weldering
Meet speed 150mm/min, alloy powder gives speed 60g/min, swing width 50mm,
The welding condition of outer small disc 6 are as follows: transfer arc current 110-120A, transfer arc voltage 25V, speed of welding
150mm/min, alloy powder give speed 30g/min, swing width 15mm.
In the present embodiment, in step 2, step 4, the heat treatment of the valve disc is tempering heat treatment, heating rate≤75 DEG C/
H, cooling rate≤75 DEG C/h.
In conclusion using a kind of valve disc multiple location plasma spray stellite process of the invention, technique
Process is simple, can be improved working efficiency, reduces production cost, by rationally welding and heat treatment process sequence, in conjunction with phase
The welding condition matched can be realized the surfacing stellite directly on each face of weld to be painted of valve disc, can be avoided and weld
Crackle, and the good toughness of heat affected area are connect, rate of dilution is low, and weld is accepted rate is high.
The invention is not limited to specific embodiments above-mentioned.The present invention, which expands to, any in the present specification to be disclosed
New feature or any new combination, and disclose any new method or process the step of or any new combination.
Claims (9)
1. a kind of valve disc multiple location plasma spray stellite process, which comprises the following steps:
Step 1, the inner headed face (1) for waiting for valve disc surfacing, inner conical surface (2) and male cone (strobilus masculinus) (3) carry out plasma spray Si Taili conjunction
Gold, wherein
The welding condition of inner headed face (1) are as follows: transfer arc current 50-130A, transfer arc voltage 15-25V, speed of welding 60-
150mm/min, alloy powder give speed 10-30g/min, swing width 4-15mm,
The welding condition of inner conical surface (2) are as follows: transfer arc current 100-200A, transfer arc voltage 20-30V, speed of welding 60-
150mm/min, alloy powder give speed 15-50g/min,
The welding condition of male cone (strobilus masculinus) (3) are as follows: transfer arc current 100-300A, transfer arc voltage 30-40V, speed of welding 40-
150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm；
Step 2 carries out the destressing heat treatment of first time postwelding to valve disc；
Step 3, the outer end face (4) for waiting for valve disc surfacing, outer big disc (5), outer small disc (6) carry out plasma spray Si Taili
Alloy, wherein
Outer end face (4), outer big disc (5) welding condition are as follows: transfer arc current 100-300A, transfer arc voltage 30-
40V, speed of welding 40-150mm/min, alloy powder give speed 30-60g/min, swing width 10-50mm,
The welding condition of outer small disc (6) are as follows: transfer arc current≤120A, transfer arc voltage≤25V, speed of welding 40-
150mm/min, alloy powder give speed≤30g/min, swing width≤15mm；
Step 4 carries out second of postwelding destressing heat treatment to valve disc；
In step 1, step 3, surfacing inner headed face (1) uses gun body diameter≤26mm Hole plasma welding rifle, surfacing inner cone
Face (2) uses 45° angle degree Hole plasma welding rifle, surfacing male cone (strobilus masculinus) (3), outer end face (4), outer big disc (5) and outer roundlet
Face (6) uses outer circle plasma spray welding gun.
2. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: before step 1, between step 2 and step 3 it is further comprising the steps of: valve disc is clamped on turnover positioner；It adjusts
Positioner makes the face of weld to be painted of valve disc be in horizontality.
3. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: before step 1, between step 2 and step 3 it is further comprising the steps of: the face of weld to be painted of valve disc is preheated, preheating temperature
350 DEG C -600 DEG C, soaking time >=30min.
4. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: between step 1 and step 2, between step 3 and step 4 it is further comprising the steps of: heat after being carried out to the face of surfacing of valve disc,
350 DEG C -600 DEG C of postheat temperature, soaking time >=30min.
5. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: in step 1, step 3, protective gas and ion-gas are argon gas, purity >=99.99% of argon gas.
6. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: in step 1, step 3, temperature is 350 DEG C -600 DEG C between road.
7. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: in step 1, step 3, surfacing mode is that annular welds or spiral shape are welded.
8. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: in step 2, step 4, the heat treatment of the valve disc is tempering heat treatment, 600-760 DEG C of tempering temperature, soaking time 6-8h,
Heating rate≤75 DEG C/h, cooling rate≤75 DEG C/h, valve disc tapping temperature≤150 DEG C.
9. a kind of valve disc multiple location plasma spray stellite process according to claim 1, feature exist
In: each face of weld size to be painted of valve disc are as follows: the diameter of inner headed face (1) is 30-80mm, and the end diameter of inner conical surface (2) is 30-
80mm, cone angle are 30 ° -60 °, and outside diameter >=200mm, the cone angle of male cone (strobilus masculinus) (3) are 30 ° -60 °, outer end face (4)
Outside diameter >=200mm, diameter >=150mm of outer big disc (5), diameter≤100mm of outer small disc (6).
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| CN107598351B (en) * | 2017-09-13 | 2023-10-03 | 中国原子能科学研究院 | Large-area plasma surfacing method for outer circle of Stellite cobalt-based alloy |
| CN108067716A (en) * | 2017-11-20 | 2018-05-25 | 湖南红宇耐磨新材料股份有限公司 | It is a kind of to roll the method for spray-welding for scooping wall and/or crushing wall applied to gyratory crusher |
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| CN109514059A (en) * | 2018-11-23 | 2019-03-26 | 东方电气集团东方汽轮机有限公司 | A kind of sliding surface manufacturing method of valve parts |
| CN109530894B (en) * | 2018-11-23 | 2021-06-08 | 东方电气集团东方汽轮机有限公司 | Method for plasma spray welding stellite alloy on valve seat sealing surface |
| CN109514058B (en) * | 2018-11-23 | 2020-12-29 | 东方电气集团东方汽轮机有限公司 | Water erosion prevention treatment method for last-stage blade of steam turbine |
| CN111545884A (en) * | 2020-05-26 | 2020-08-18 | 南通市力沛流体阀业有限公司 | F92 flashboard sealing surface plasma spray welding method |
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