CN108526654A - A kind of large-diameter valves sealing ring overlaying method - Google Patents
A kind of large-diameter valves sealing ring overlaying method Download PDFInfo
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- CN108526654A CN108526654A CN201810662194.XA CN201810662194A CN108526654A CN 108526654 A CN108526654 A CN 108526654A CN 201810662194 A CN201810662194 A CN 201810662194A CN 108526654 A CN108526654 A CN 108526654A
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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
- B23K9/00—Arc welding or cutting
- B23K9/04—Welding for other purposes than joining, e.g. built-up welding
- B23K9/042—Built-up welding on planar surfaces
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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
- B23K9/00—Arc welding or cutting
- B23K9/16—Arc welding or cutting making use of shielding gas
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
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Abstract
The present invention is a kind of large-diameter valves sealing ring overlaying method.This method between valve sealing face and hard alloy layer by increasing transition zone, transition zone selects ER310 welding wires, hard alloy selects Co Cr Mo Si rare earth alloy powders, and in built-up welding transition zone and hard alloy layer, reasonably select welding condition and heat treatment temperature, welding deformation amount is reduced, surfacing hardness is improved, and avoids the cracking phenomena occurred in the direct pile-up welding hard alloy layer of valve sealing face.
Description
Technical field
The present invention relates to welding procedure more particularly to a kind of large-diameter valves sealing ring overlaying methods.
Background technology
High temperature, erosion resistant valve are mainly used in the fields such as derived energy chemical, the crucial field extremely severe for operating condition
It closes.Valve working temperature is corroded, and valve switch is frequent by the erosion of fluid, medium commonly greater than 400 DEG C, once
Valve sealing face leaks, and will cause heavy economic losses, seriously threatens the safety of producers, it is close that this requires valves
Cover will have excellent corrosion-resistant, wear-resistant, high temperature resistance.
In order to improve the performance of valve sealing face, traditional way is exactly one layer of hard conjunction of built-up welding on valve seat rings
Gold, and bead-welding technology has prodigious influence to the quality of overlay cladding.At present in valve seat rings weld deposit process, generally existing
Problems with：Since the difference of valve seat rings and cemented carbide material coefficient of thermal expansion can cause overlay cladding to crack；Welder
Skill parameter is unreasonable, causes overlay cladding dilution rate excessive, and overlay cladding hard alloy is diluted by base material, and surfacing hardness cannot reach
It is required that；For large-diameter valves sealing ring, welding method, welding condition are unreasonable etc. can also cause torsional deformation.More than
Problem so that product quality is poor, and one time built-up welding yield rate is relatively low.
Invention content
The present invention is directed to the above problem occurred in large-diameter valves sealing ring weld deposit process, proposes a kind of large-diameter valves
Sealing ring overlaying method.The present invention is selected by increasing transition zone, transition zone between valve seat rings and hard alloy layer
ER310 welding wires, hard alloy select Co-Cr-Mo-Si- rare earth alloy powders, and in built-up welding transition zone and hard alloy layer,
Welding condition and heat treatment temperature are reasonably selected, welding deformation amount is reduced, improves surfacing hardness, and avoid
The cracking phenomena occurred when direct pile-up welding hard alloy layer on valve seat rings.
The technical scheme is that：
A kind of large-diameter valves sealing ring overlaying method, includes the following steps：
(1) preweld cleaning：The valve seal ring surface vehicle for waiting for built-up welding is put down, is then cleaned with acetone and waits for overlaying surface；In addition,
ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders are toasted into 2~3h at 150~200 DEG C；
(2) built-up welding transition zone:Built-up welding ER310 welding wires on the flat sealing surface of vehicle are welded in using tungsten argon arc, it is more using multilayer
Road welds, after being soldered together, then under weldering together, until entire sealing surface to be welded to full, 1.5~2.0mm of every layer thickness, built-up welding 2~3
Layer, using smaller welding current when first layer built-up welding, heap is soldered and carries out next layer of built-up welding after one layer again；It will after the completion of built-up welding
Transition zone vehicle is flat, and control transition region thickness is 2~3mm；
Wherein, welding parameter：First layer welding current 100A, the second layer to third layer 110~130A of welding current, welding
Voltage 20V, 70~90mm/min of speed of welding, 8~10L/min of argon flow amount, interlayer temperature is at 0~100 DEG C；
(3) weld preheating：The sealing ring for being soldered transition zone to heap using the method that oxyacetylene torch heats is preheated, in advance
Hot temperature is 400~450 DEG C；
(4) built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layer：Using the transition that plasma arc surfacing equipment is flat in vehicle
Multilayer multiple tracks built-up welding is carried out on layer, after being soldered together, then under weldering together, until entire sealing surface to be welded to full, every layer heap layer
1.5~2.0mm of thickness, overlay cladding are controlled at 3~4 layers；It is toasted using oxyacetylene torch in weld deposit process, controls interlayer
Temperature range is at 400~450 DEG C；
Wherein, welding parameter：First layer welding current 150A, the second layer to the 4th layer of 160~180A of welding current, welding
30~40mm/min of speed, 100~120mm/min of swing speed, plasma (orifice) gas are Ar and H2Gaseous mixture, 4~6L/ of flow
Min, 26~30g/min of powder sending quantity；
(5) post weld heat treatment：By the valve seat rings of heap postwelding with stove heat to 600~650 DEG C, stove inside holding 3~
Then 4h cools to 180 DEG C with the furnace and takes out, naturally cools to room temperature；
(6) it is machined：Weld-deposited cladding is processed using lathe, make hard alloy layer thickness be 4~
5mm。
In built-up welding in the step (4), H in plasma (orifice) gas2The percentage by volume for accounting for gaseous mixture is 5%.
The beneficial effects of the invention are as follows：
It is suitable that welding method of the present invention and wlding are selected, and welding condition is reasonable, can be substantially reduced overlay cladding dilution
Rate improves surfacing hardness and wearability, through measuring, the weld-deposited cladding hardness number of acquisition >=40HRC, disclosure satisfy that
Hardness requirement.Increase transition zone between valve seal ring base and weld-deposited cladding, breaches valve seal ring base
It is easy the difficult point of cracking with overlay cladding, and solves the problems, such as that weld-deposited cladding is easily cracked, after Liquid penetrant testing,
Overlay surface do not find crackle, be mingled with, stomata the defects of, a built-up welding qualification rate is increased to 80% by original 60%, greatly
Product quality and production efficiency are improved greatly, is compared after valve static pressure life test, using the valve of built-up welding of the present invention
The sealing ring keying service life is increased to 18000 times or so by original 15000 times or so.
Description of the drawings
Fig. 1 is photo after 1 overlay cladding Liquid penetrant testing of the embodiment of the present invention.
Specific implementation mode
The present invention is further described with reference to embodiment.
A kind of large-diameter valves sealing ring bead-welding technology, includes the following steps：
1. welding method is selected with wlding：
In order to solve to crack caused by valve seat rings are different from cemented carbide material coefficient of thermal expansion, the present invention is in valve
Built-up welding transition zone between door sealing ring base and hard alloy layer, transition zone will have good high temperature resistant and corrosion resisting property, therefore
Welding wire selects ER310 stainless steel welding sticks, diameter 2.5mm, overlaying method to use ac tungsten inert gases welding.In order to meet valve seal
In face of the requirement of hardness and wearability, then built-up welding Co-Cr-Mo-Si- rare earth alloy powders, built-up welding on stainless steel transition zone
Method selection plasma arc powder built-up welding.
One ER310 welding wires chemical composition (wt.%) of table
The deposited metal that built-up welding ER310 stainless steel welding sticks obtain is austenite structure, has excellent corrosion-and high-temp-resistant
Performance and excellent mechanical property, cracking resistance and antioxygenic property can close under rational welding condition with hard
Golden overlay cladding combines well.
The chemical composition (wt.%) of two Co-Cr-Mo-Si- rare earth alloy powders of table
| Cr | Mo | Si | Al | Ta | Y2O3 | CeO2 | Co |
| 12~14 | 20~24 | 2.5~3.2 | 3~6 | 1~3 | 0.3~0.8 | 0.1~0.2 | Bal |
Co-Cr-Mo-Si- rare earth alloy powders can form a kind of Laves phases in built-up welding, and Laves phases are a kind of hard
Phase, its presence can improve the hardness and wear resistance of overlay cladding, and Y is added2O3And CeO2Equal rare earth oxides can refine crystalline substance
Grain, improves the corrosion resistance of overlay cladding, disclosure satisfy that the requirement that valve sealing face works under severe conditions.
2. welding preparation：
The valve seal ring surface vehicle for waiting for built-up welding is put down, there must not be the defects of crackle, etch pit, then be cleaned with acetone and wait for heap
The face of weld ensures anhydrous, greasy dirt etc., ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders is toasted 2 at 150~200 DEG C
~3h.
3. built-up welding transition zone:
Built-up welding ER310 welding wires on the flat sealing surface of vehicle are welded in using tungsten argon arc, using multi-pass welding, are soldered together
Afterwards, then weldering is lower together, until the weldering of entire sealing surface is full (forming one layer), per 1.5~2.0mm of layer thickness, 2~3 layers of built-up welding,
Using smaller welding current when first layer built-up welding, heap is soldered and carries out next layer of built-up welding after one layer again.After the completion of built-up welding incited somebody to action
It is flat to cross layer vehicle, after Liquid penetrant testing, there must not be the defects of crackle, slag inclusion to generate, control transition region thickness is 2~3mm.Transition zone
For austenitic stainless steel, it is higher to HOT CRACK FOR WELDING P sensibility, liquation crack, crater crack and intercrystalline corrosion easily occurs, because
This will use lower heat input.
Welding parameter：First layer welding current 100A, the second layer to third layer 110~130A of welding current, weldingvoltage
20V, 70~90mm/min of speed of welding, 8~10L/min of argon flow amount will strictly control interlayer temperature at 0~100 DEG C.
4. weld preheating
The hard brittleness of Co-Cr-Mo-Si- rare earth alloy overlay claddings is apparent, in order to prevent transition zone and carbide reactor when built-up welding
Layer generates cracking and crackle, and the sealing ring preheating that heap is welded with to transition zone, the present invention is needed to adopt before pile-up welding hard alloy layer
With oxyacetylene torch heat method sealing ring is preheated, with temperature measurer measure preheating temperature, preheating temperature be 400~
450℃。
5. built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layers：
Multilayer multiple tracks built-up welding is carried out on the flat transition zone of vehicle using plasma arc surfacing equipment, after being soldered together, is connect
It is lower together weldering, until the weldering of entire sealing surface is full, per layer heap layer 1.5~2.0mm of thickness, overlay cladding is controlled at 3~4 layers.
It is toasted using oxyacetylene torch in weld deposit process, control interlayer temperature range prevents cold crack at 400~450 DEG C
It generates.When Co-Cr-Mo-Si- rare earth alloy powder built-up welding, if thermal weld stress is excessive, overlay cladding dilution rate can be reduced, is subtracted
Few Laves phase amounts, make surfacing hardness decline with wearability；Heat input is too small, can lead to Co-Cr-Mo-Si- rare earth alloys
Powder is unable to fully melt, and keeps overlaying shaping poor, can also cause incomplete fusion, it is lack of penetration the defects of.
Welding parameter：First layer welding current 150A, the second layer to the 4th layer of 160~180A of welding current, speed of welding
30~40mm/min, 100~120mm/min of swing speed, plasma (orifice) gas Ar+5%H2The gaseous mixture of (volume ratio), flow 4
~6L/min, 26~30g/min of powder sending quantity.
6. post weld heat treatment：
In order to eliminate welding stress, the generation of crackle is prevented, needs to carry out at postwelding heat the valve seat rings that heap is soldered
Reason.By the valve seat rings of heap postwelding with stove heat to 600~650 DEG C, in stove 3~4h of inside holding, 180 are then cooled to the furnace
DEG C and take out, naturally cool to room temperature.
7. mechanical processing：Weld-deposited cladding is processed using lathe, ensure hard alloy layer thickness be 4~
5mm。
Embodiment 1：
(1) welding method is selected with wlding：Transition zone overlaying method uses ac tungsten inert gases welding, welding wire to select ER310
Stainless steel welding stick, diameter 2.5mm.Weld-deposited cladding overlaying method selects plasma arc powder built-up welding, wlding to select Co-
Cr-Mo-Si- rare earth alloy powders.
(2) welding preparation：The valve sealing face vehicle for waiting for built-up welding is put down, there must not be the defects of crackle, etch pit, then use acetone
Cleaning waits for overlaying surface, ensures anhydrous, greasy dirt etc., ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders are dried at 150 DEG C
Roasting 2h.
Wherein, the chemical composition (wt.%) of the Co-Cr-Mo-Si- rare earth alloy powders is specially Cr：12%；Mo：
20%；Si：2.5%；Al：3%；Ta：1.5%；Yttrium oxide：0.3%；Cerium oxide：0.1%；Surplus is Co, the grain of starting powder
Diameter ranging from 200~350 mesh.(following embodiment is same)
(3) built-up welding transition zone：
It is soldered using multi-pass welding in the flat sealing ring surface overlaying ER310 welding wires of vehicle using ac tungsten inert gases welding
After together, then weldering is lower together, full up to welding entire sealing surface, per layer thickness 1.5mm；2 layers of built-up welding, first layer welding current
100A, second layer welding current 110A, weldingvoltage 20V, speed of welding 70mm/min, argon flow amount 8L/min will be controlled strictly
Interlayer temperature processed is at 30 DEG C.Then the transition zone vehicle of heap postwelding is put down, after Liquid penetrant testing, there must not be the defects of crackle, slag inclusion
It generates, control transition region thickness is 2mm.
(4) weld preheating：Before built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layers, using the method for oxyacetylene torch heating
Sealing ring is preheated, measures preheating temperature with temperature measurer, preheating temperature is 400 DEG C.
(5) built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layer：
Multilayer multiple tracks built-up welding is carried out on the flat transition zone of vehicle using plasma arc surfacing equipment, after being soldered together, is connect
It is lower together weldering, until the weldering of entire sealing surface is full, per layer heap layer thickness 1.5mm, 3 layers of built-up welding.It is used in weld deposit process
Oxyacetylene torch is toasted, and control interlayer temperature range prevents the generation of cold crack at 400 DEG C.First layer welding current
150A, the second layer to third layer welding current 160A, speed of welding 30mm/min, swing speed 100mm/min, plasma (orifice) gas are
Ar+5%H2The gaseous mixture of (volume ratio), flow 4L/min, powder sending quantity 26g/min.
(6) post weld heat treatment：By the sealing ring of heap postwelding with stove heat to 600 DEG C, in stove inside holding 3h, then with furnace cooling
But it to 180 DEG C and takes out, naturally cools to room temperature.
7. mechanical processing：Weld-deposited cladding is processed using lathe, guarantee hard alloy layer thickness is 4mm.
Heap is soldered and the valve sealing face being machined carries out Liquid penetrant testing, the results are shown in Figure 1, close through heap postwelding
Seal ring overlay cladding flawless, stomata, the defects of being mingled with, illustrates that the welding method is reasonable, can obtain beneficial without apparent deformation
Effect.
Embodiment 2：
(1) welding method is selected with wlding：Transition zone overlaying method uses ac tungsten inert gases welding, welding wire to select ER310
Stainless steel welding stick, diameter 2.5mm.Weld-deposited cladding overlaying method selects plasma arc powder built-up welding, wlding to select Co-
Cr-Mo-Si- rare earth alloy powders.
(2) welding preparation：The valve seal ring surface vehicle for waiting for built-up welding is put down, there must not be the defects of crackle, etch pit, then use
Acetone cleaning waits for overlaying surface, ensures anhydrous, greasy dirt etc., by ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders at 180 DEG C
Lower baking 2.5h.
(3) built-up welding transition zone：
Using ac tungsten inert gases welding, built-up welding ER310 welding wires are soldered one using multi-pass welding on the flat sealing surface of vehicle
Behind road, then weldering is lower together, until the weldering of entire sealing surface is full, per layer thickness 2mm, 2 layers of built-up welding, first layer welding current
100A, second layer welding current 120A, weldingvoltage 20V, speed of welding 80mm/min, argon flow amount 9L/min will be controlled strictly
Interlayer temperature processed is at 60 DEG C.Then the transition zone vehicle of heap postwelding is put down, after Liquid penetrant testing, there must not be the defects of crackle, slag inclusion
It generates, control transition region thickness is 2.5mm.
(4) weld preheating：Before built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layers, using the method for oxyacetylene torch heating
Sealing ring is preheated, measures preheating temperature with temperature measurer, preheating temperature is 425 DEG C.
(5) built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layer：
Multilayer multiple tracks built-up welding is carried out on the flat transition zone of vehicle using plasma arc surfacing equipment, after being soldered together, is connect
It is lower together weldering, until the weldering of entire sealing surface is full, per layer heap layer thickness 2mm, 3 layers of built-up welding.Oxygen is used in weld deposit process
Acetylene torch is toasted, and control interlayer temperature range prevents the generation of cold crack at 425 DEG C.First layer welding current 150A,
The second layer is to third layer welding current 170A, speed of welding 35mm/min, swing speed 110mm/min, plasma (orifice) gas Ar+
5%H2The gaseous mixture of (volume ratio), flow 5L/min, powder sending quantity 28g/min.
(6) post weld heat treatment：By the sealing ring of heap postwelding with stove heat to 625 DEG C, in stove inside holding 3.5h, then with stove
It is cooled to 180 DEG C and takes out, naturally cool to room temperature.
(7) it is machined：Weld-deposited cladding is processed using lathe, ensures that hard alloy layer thickness is
4.5mm。
Embodiment 3：
(1) welding method is selected with wlding：Transition zone overlaying method uses ac tungsten inert gases welding, welding wire to select ER310
Stainless steel welding stick, diameter 2.5mm.Weld-deposited cladding overlaying method selects plasma arc powder built-up welding, wlding to select Co-
Cr-Mo-Si- rare earth alloy powders.
(2) welding preparation：The valve seal ring surface vehicle for waiting for built-up welding is put down, there must not be the defects of crackle, etch pit, then use
Acetone cleaning waits for overlaying surface, ensures anhydrous, greasy dirt etc., by ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders at 200 DEG C
Lower baking 3h.
(3) built-up welding transition zone：
Using ac tungsten inert gases welding, built-up welding ER310 welding wires are soldered one using multi-pass welding on the flat sealing surface of vehicle
Behind road, then weldering is lower together, until the weldering of entire sealing surface is full, per layer thickness 1.5mm, 3 layers of built-up welding, first layer welding current
100A, the second layer to third layer welding current 130A, weldingvoltage 20V, speed of welding 90mm/min, argon flow amount 10L/min,
Interlayer temperature strictly to be controlled at 90 DEG C.Then the transition zone vehicle of heap postwelding is put down, after Liquid penetrant testing, must not there is crackle, folder
The defects of slag, generates, and control transition region thickness is 3mm.
(4) weld preheating：Before built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layers, using the method for oxyacetylene torch heating
Sealing ring is preheated, measures preheating temperature with temperature measurer, preheating temperature is 450 DEG C.
(5) built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layer：
Multilayer multiple tracks built-up welding is carried out on the flat transition zone of vehicle using plasma arc surfacing equipment, after being soldered together, is connect
It is lower together weldering, until the weldering of entire sealing surface is full, per layer heap layer thickness 1.5mm, 4 layers of built-up welding.It is used in weld deposit process
Oxyacetylene torch is toasted, and control interlayer temperature range prevents the generation of cold crack at 450 DEG C.First layer welding current
150A, the second layer to the 4th layer of welding current 180A, speed of welding 40mm/min, swing speed 120mm/min, plasma (orifice) gas are
Ar+5%H2The gaseous mixture of (volume ratio), flow 6L/min, powder sending quantity 30g/min.
(6) post weld heat treatment：By the sealing ring of heap postwelding with stove heat to 650 DEG C, in stove inside holding 4h, then with furnace cooling
But it to 180 DEG C and takes out, naturally cools to room temperature.
(7) it is machined：Weld-deposited cladding is processed using lathe, guarantee hard alloy layer thickness is 5mm.
In order to verify the performance of each embodiment valve sealing face, advised according to JB/T8858-2004 gate valve static pressure life tests
Journey carries out static pressure life test to each valve sealing face, and test(ing) medium is normal-temperature water, pressure 40kgf/cm2, it is than pressure q
935kgf/cm2.In production, valve carries out after repeatedly opening and closing, and as dielectric leakage amount >=5mL/min, valve sealing face is just not
It can meet the requirements.The service life of valve sealing face is weighed with the keying number carried out when dielectric leakage amount >=5mL/min, experiment knot
Fruit is shown in Table three.
Table three
| Embodiment | 1 | 2 | 3 |
| Open and close number | 18320 | 17550 | 16280 |
Hardness measurement is carried out to the valve sealing face of the above various embodiments built-up welding using Rockwell apparatus, and close in each valve
It is sampled on cover, sample size φ 6mm*12mm, high temperature wear experiment, load 20N, rotating speed 150r/ is carried out at 500 DEG C
Min, wearing- in period 15min, measure its high temperature abrasion resistance, and test result is shown in Table four.
Table four
| Embodiment | Macrohardness (HRC) | Wear extent (mg) |
| 1 | 49 | 18 |
| 2 | 46 | 23 |
| 3 | 44 | 29 |
The large-diameter valves sealing ring that above example obtains, compared with traditional handicraft, hardness and wearability have prodigious
It improves, disclosure satisfy that valve seal faces the requirement of hardness and wearability.Overlay cladding is well combined with matrix, through Liquid penetrant testing,
Overlay cladding flawless, stomata, the defects of being mingled with, a built-up welding qualification rate is increased to 80% by original 60%, significantly improves
Product quality and first-time qualification rate.Through static pressure life test, it can be seen that had using the valve seat rings service life of built-up welding of the present invention
Apparent raising.
It is the preferred embodiment of the present invention above.The design of all those skilled in the art according to the present invention exists
By logic analysis, reasoning or the change or replacement expected without creativeness in the prior art, should all cover the present invention's
Within protection scope of the present invention.
Unaccomplished matter of the present invention is known technology.
Claims (2)
1. a kind of large-diameter valves sealing ring overlaying method, it is characterized in that this approach includes the following steps：
(1) preweld cleaning：The valve seal ring surface vehicle for waiting for built-up welding is put down, is then cleaned with acetone and waits for overlaying surface；In addition, will
ER310 welding wires and Co-Cr-Mo-Si- rare earth alloy powders toast 2~3h at 150~200 DEG C；
(2) built-up welding transition zone:Built-up welding ER310 welding wires on the flat sealing surface of vehicle are welded in using tungsten argon arc, using multi-pass welding,
After being soldered together, then weldering is lower together, full up to welding entire sealing surface, per 1.5~2.0mm of layer thickness, 2~3 layers of built-up welding, the
Using smaller welding current when one layer heap is welded, heap is soldered and carries out next layer of built-up welding after one layer again；By transition after the completion of built-up welding
Layer vehicle is flat, and control transition region thickness is 2~3mm；
Wherein, welding parameter：First layer welding current 100A, the second layer to third layer 110~130A of welding current, weldingvoltage
20V, 70~90mm/min of speed of welding, 8~10L/min of argon flow amount, interlayer temperature is at 0~100 DEG C；
(3) weld preheating：The sealing ring for being soldered transition zone to heap using the method that oxyacetylene torch heats is preheated, preheating temperature
Degree is 400 DEG C~450 DEG C；
(4) built-up welding Co-Cr-Mo-Si- carbide alloy of rare earth layer：Using plasma arc surfacing equipment on the flat transition zone of vehicle
Multilayer multiple tracks built-up welding is carried out, after being soldered together, then under weldering together, until entire sealing surface to be welded to full, every layer heap layer thickness
1.5~2.0mm, overlay cladding are controlled at 3~4 layers；It is toasted using oxyacetylene torch in weld deposit process, controls interlayer temperature
Range is at 400~450 DEG C；
Wherein, welding parameter：First layer welding current 150A, the second layer to the 4th layer of 160~180A of welding current, speed of welding
30~40mm/min, 100~120mm/min of swing speed, plasma (orifice) gas are Ar and H2Gaseous mixture, 4~6L/min of flow send
26~30g/min of powder amount；
(5) post weld heat treatment：By the valve seat rings of heap postwelding with stove heat to 600~650 DEG C, in stove 3~4h of inside holding, so
After cool to 180 DEG C with the furnace and take out, naturally cool to room temperature；
(6) it is machined：Weld-deposited cladding is processed using lathe, it is 4~5mm to make hard alloy layer thickness.
2. large-diameter valves sealing ring overlaying method as described in claim 1, it is characterized in that in built-up welding in step (4), etc.
H in ion-gas2The percentage by volume for accounting for gaseous mixture is 5%.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109202232A (en) * | 2018-11-28 | 2019-01-15 | 美钻深海能源科技研发（上海）有限公司 | A kind of overlaying method of preventer sealing surface |
| CN109590669A (en) * | 2019-02-16 | 2019-04-09 | 四川亚西机器有限公司 | A kind of alloy welding deposit technique |
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| CN114131242A (en) * | 2021-12-24 | 2022-03-04 | 东方电气集团东方汽轮机有限公司 | Alloy material for surfacing layer of sealing surface of valve seat and welding process of alloy material |
| CN115008138A (en) * | 2022-06-28 | 2022-09-06 | 江苏华之益机械有限公司 | Surfacing machining process for valve component |
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| CN109590669A (en) * | 2019-02-16 | 2019-04-09 | 四川亚西机器有限公司 | A kind of alloy welding deposit technique |
| CN110560858A (en) * | 2019-09-11 | 2019-12-13 | 辽宁科技大学 | method for producing composite cutter blank by applying plasma surfacing process |
| CN112846457A (en) * | 2020-12-31 | 2021-05-28 | 福尼斯(南京)表面工程技术有限公司 | Method for welding chemical manhole flange by variable-polarity double tungsten electrodes |
| CN113579440A (en) * | 2021-07-23 | 2021-11-02 | 江苏圣泰阀门有限公司 | Welding process for surfacing T800 on annular plane |
| CN113579440B (en) * | 2021-07-23 | 2022-08-05 | 江苏圣泰阀门有限公司 | Welding process for surfacing T800 on annular plane |
| CN114131242A (en) * | 2021-12-24 | 2022-03-04 | 东方电气集团东方汽轮机有限公司 | Alloy material for surfacing layer of sealing surface of valve seat and welding process of alloy material |
| CN114131242B (en) * | 2021-12-24 | 2023-08-25 | 东方电气集团东方汽轮机有限公司 | Alloy material for valve seat sealing surface overlaying layer and welding process thereof |
| CN115008138A (en) * | 2022-06-28 | 2022-09-06 | 江苏华之益机械有限公司 | Surfacing machining process for valve component |
| CN115319242A (en) * | 2022-07-19 | 2022-11-11 | 广西防城港核电有限公司 | Method for repairing welding defect of valve lip |
| CN115319242B (en) * | 2022-07-19 | 2023-12-29 | 广西防城港核电有限公司 | Repair method for valve lip welding defect |
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