CN102974917B - Stellite alloy bead weld method of gas turbine combustion chamber - Google Patents
Stellite alloy bead weld method of gas turbine combustion chamber Download PDFInfo
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Abstract
Disclosed is a method of gas turbine combustion chamber stellite alloy bead weld. The invention relates to the method of combustion chamber stellite alloy bead weld, and provides the method of the gas turbine combustion chamber stellite alloy bead weld which aims at solving problems that weld joint strength and anti-cracking ability of the gas turbine combustion chamber stellite alloy bead weld not comply with the design requirements, and safe operation of a unit is unsteady. The method of the gas turbine combustion chamber stellite alloy bead weld comprises the following steps of (1) cleaning welding areas of workpieces, (2) heating the workpieces by using kiln equipment, (3) welding the satellite alloy on the workpieces by using a direct current argon arc welding machine, (4) carrying out heat treatment on the workpieces after the workpieces are welded with no flaws, namely achieving bead weld of the gas turbine combustion chamber stellite alloy. The method of the gas turbine combustion chamber stellite alloy bead weld is applied to the field of the gas turbine combustion chamber stellite alloy bead weld.
Description
Technical field
The present invention relates to combustion chamber surfacing stellite method.
Background technology
Locator in Compressor Set combustion chamber and combustion chamber seat ring, material is Russia's mark nickel base superalloy
(10Cr30Ni50WMoAlTiNb), by designing requirement need on this material built-up welding one deck stellite layer, to improve its particular/special requirement such as wear-resistant, shock-resistant, corrosion-resistant.For
weldability understand less at present, in this material, built-up welding surfacing stellite belongs to new welding procedure.Designing requirement surfacing hardness will at more than HRC40 in addition, but stellite is one easily splits wlding, and its crack resistance and hardness are again the performance indications of two kinds of contradictions.Therefore need to carry out a series of welding, heat treatment and the test such as metallographic, mechanics by analog equipment sample, find out optimised process, make Weld Performance reach product requirement, ensure Compressor Set safe operation.
At present, in surfacing stellite, in technique, we are little with foreign technology gap, but because the development of China 30MW natural gas compressing gas turbine is than external late, understand less to Ukraine's standard material.Therefore right
(10Cr30Ni50WMoAlTiNb) welding performance of this nickel base superalloy is understood few, only have and grope the welding characteristics such as its welding mobility, deposition effect, linear expansion coefficient, shrinkage factor by soldering test, and check its Weld Performance by Physicochemical test, final analysis draws rational technological parameter, improve surfacing stellite technique, ensure that the property indices such as the hardness of overlay cladding reach designing requirement, make the gas-turbine combustion chamber surfacing stellite manufacturing process of company reach domestic and international advanced level.
Summary of the invention
The present invention be to solve gas-turbine combustion chamber surfacing stellite weld strength, cracking resistance does not meet designing requirement and the jiggly problem of unit safety operation, and propose a kind of gas-turbine combustion chamber surfacing stellite method.
A kind of gas-turbine combustion chamber surfacing stellite of the present invention method realizes according to the following steps:
One, volumn concentration is used to be that 97% ~ 100% ethanol water is cleared up workpiece welding region;
Two, adopt stove equipment to workpiece heat to 350 ~ 400 DEG C and maintain the temperature at that this is interval;
Three, pass into argon gas protection with the flow velocity of 8 ~ 10L/min, then use direct-flow argon-arc welder to weld workpiece; Wherein, described direct-flow argon-arc welder selects Φ 2.0 cerium tungsten electrode, and welding current is adjusted to 45 ~ 60A, and the wlding that described welding uses is the too vertical No. 6 cobalt base hard alloy welding wires of department, speed of welding 60 ~ 80mm/min, temperature 350 ~ 400 DEG C between road;
Four, after workpiece flawless weld defect, it is heat-treated; Wherein, described heat treatment method is: with 150 ~ 200 DEG C/time programming rate, workpiece is warming up to 840 ~ 860 DEG C, and be incubated 2 hours, again with 100 ~ 150 DEG C/time cooling rate, workpiece is cooled to less than 150 DEG C, then carries out the built-up welding that namely air cooling completes gas-turbine combustion chamber stellite.
Invention effect: this achievement has been included in Product jointing technique at present, the welding parameter adopted in the welding procedure of Compressor Set locator, seat ring is all these parameters.By this achievement, make us right
the weldability of this material has certain understanding, be familiar with the performance characteristics of this overlaying structure, sum up the rule that Weld Performance changes with welding and heat treatment parameter, obtain the best welding parameter of Compressor Set combustion chamber Si Taili built-up welding, and provide valuable reference for the welding production of same type of material from now on, fill up the blank to this material welding research field.In the production of Compressor Set, ensure that gas-turbine combustion chamber surfacing stellite weld strength, problem that cracking resistance meets designing requirement, designing requirement surfacing hardness will at more than HRC40, and this test all can meet the demands, hardness is minimum at 43.2HRC, thus effectively ensure that Product jointing quality, reduce repair rate, save substantial contribution, effectively ensure Compressor Set quality, ensure that unit safety operation is steady.
Accompanying drawing explanation
Fig. 1 is locator weldment schematic diagram; Wherein a represents Si Taili overlay cladding weld;
Fig. 2 is seat ring weldment schematic diagram; Wherein a represents Si Taili overlay cladding weld;
Fig. 3 surfacing stellite layer hardness-heat treatment temperature curve;
Fig. 4 is locator welded specimen; Wherein A represents overlay cladding, and B represents mother metal
c represents overlay cladding ground floor, and D represents the overlay cladding second layer;
Fig. 5 is × 200 times weld seam metallographic structure photos;
Fig. 6 is metallographic structure photo under × 500 times weld seams;
Fig. 7 is × 200 times mother metal metallographic structure photos;
Fig. 8 is × 500 times mother metal metallographic structure photos;
Fig. 9 is × 200 times heat affected area metallographic structure photos;
Figure 10 is × 500 times heat affected area metallographic structure photos;
Figure 11 is × 200 times melt run metallographic structure photos;
Figure 12 is × 500 times melt run metallographic structure photos.
Detailed description of the invention
Detailed description of the invention one: a kind of gas-turbine combustion chamber surfacing stellite method of present embodiment realizes according to the following steps:
One, volumn concentration is used to be that 97% ~ 100% ethanol water is cleared up workpiece welding region;
Two, adopt stove equipment to workpiece heat to 350 ~ 400 DEG C and maintain the temperature at that this is interval;
Three, pass into argon gas protection with the flow velocity of 8 ~ 10L/min, then use direct-flow argon-arc welder to weld workpiece; Wherein, described direct-flow argon-arc welder selects Φ 2.0 cerium tungsten electrode, and welding current is adjusted to 45 ~ 60A, and the wlding that described welding uses is the too vertical No. 6 cobalt base hard alloy welding wires of department, speed of welding 60 ~ 80mm/min, temperature 350 ~ 400 DEG C between road;
Four, after workpiece flawless weld defect, it is heat-treated; Wherein, described heat treatment method is: with 150 ~ 200 DEG C/time programming rate, workpiece is warming up to 840 ~ 860 DEG C, and be incubated 2 hours, again with 100 ~ 150 DEG C/time cooling rate, workpiece is cooled to less than 150 DEG C, then carries out the built-up welding that namely air cooling completes gas-turbine combustion chamber stellite.
Present embodiment effect: this achievement has been included in Product jointing technique at present, the welding parameter adopted in the welding procedure of Compressor Set locator, seat ring is all these parameters.By this achievement, make us right
the weldability of this material has certain understanding, be familiar with the performance characteristics of this overlaying structure, sum up the rule that Weld Performance changes with welding parameter, obtain the best welding parameter of Compressor Set combustion chamber Si Taili built-up welding, and provide valuable reference for the welding production of same type of material from now on, fill up the blank to this material welding research field.In the production of Compressor Set, ensure that gas-turbine combustion chamber surfacing stellite weld strength, problem that cracking resistance meets designing requirement, designing requirement surfacing hardness will at more than HRC40, and this test all can meet the demands, hardness is minimum at 43.2HRC, thus effectively ensure that Product jointing quality, reduce repair rate, save substantial contribution and effectively ensure Compressor Set quality, ensure that unit safety operation is steady.
Detailed description of the invention two: present embodiment and detailed description of the invention one are locator in gas-turbine combustion chamber and seat ring unlike: the workpiece in step one.Other step and parameter identical with detailed description of the invention one.
Detailed description of the invention three: present embodiment and detailed description of the invention one or two unlike: to workpiece heat to 360 ~ 390 DEG C in step 2.Other step and parameter identical with detailed description of the invention one or two.
Detailed description of the invention four: one of present embodiment and detailed description of the invention one to three are unlike purity of argon 99.999% ~ 100% in step 3.Other step and parameter identical with one of detailed description of the invention one to three.
Detailed description of the invention five: one of present embodiment and detailed description of the invention one to four unlike: be pass into argon gas with the flow velocity of 8.5 ~ 9.5L/min to carry out protecting in step 3.Other step and parameter identical with one of detailed description of the invention one to four.
Detailed description of the invention six: one of present embodiment and detailed description of the invention one to five unlike: in step 3, welding current is adjusted to 50 ~ 55A..Other step and parameter identical with one of detailed description of the invention one to five.
Detailed description of the invention seven: one of present embodiment and detailed description of the invention one to six unlike: in step 3, speed of welding controls at 65 ~ 75mm/min.Other step and parameter identical with one of detailed description of the invention one to six.
Detailed description of the invention eight: one of present embodiment and detailed description of the invention one to seven are unlike temperature 360 ~ 390 DEG C between road in step 3.Other step and parameter identical with one of detailed description of the invention one to seven.
By following verification experimental verification beneficial effect of the present invention:
Test 1
1, obtained by the experiment of metallochemistry analysis of components
material metal chemical composition is as shown in table 1:
Table 1
material metal chemical composition
2, right by stretching, impact and high-temperature behavior test
material carries out mechanics performance determining, obtains
material mechanical performance result is as shown in table 2:
Table 2
material mechanical performance and high temperature endurance performance
3, wlding aspect requires and designing requirement according to its properties of product, and select too vertical No. 6 (Stellite-6) cobalt base hard alloy welding wires of department to weld, after this wire welding, hardness can reach more than 40HRC, and its chemical composition is as shown in table 3:
Table 3Stellite-6 welding wire chemical composition
| The trade mark | C | Mn | W | Ni | Cr | Mo | Fe | Si | Co |
| Stellite-6 | 0.9～1.4 | ≤1.0 | 3.0～6.0 | 2.0～3.0 | 26.0～32.0 | ≤1.0 | ≤3.0 | 0.4～2.0 | Surplus |
Pass through welding base metal
and the analysis of wlding Stellite-6, preliminary formulation welding parameter scope, carries out welding operation test;
4, Welding Structure analysis
As Fig. 1, shown in Fig. 2, two kinds of product (locator and combustion chamber seat ring) Si Taili overlay claddings all remain 1mm after processing, and welding position is less, importantly in remaining 1mm overlay cladding, because in welding process, weld metal fuses mutually, built-up welding residue Si Taili surfacing layer metal chemical composition can be diluted by mother metal, weld metal intensity is likely caused to decline, therefore ground floor weld seam needs in welding process, to control its thickness lower than 1mm, ensure that machined surface institute bare metal is second layer weld seam, thus ensure that the composition of overlay surface stellite is accurate, hardness just can be guaranteed,
5, soldering test content
The principal element affecting stellite hardness and welding stress have following some:
1. the preheat temperature of mother metal;
2. weld interpass temperature;
3. post weld heat treatment system;
Therefore, in conjunction with take charge of too vertical position welding connect and the experience of nickel-base material welding to draft following several test technology as shown in table 4:
Table 4 test technology
By the analysis of welding base metal and wlding, tentatively formulate welding parameter scope, select following unified welding parameter can ensure that weld seam fully fuses, parameter is as shown in table 5 simultaneously:
Table 5 welds unified parameters
| Welding current | Weldingvoltage | Temperature between road | Tungsten electrode size | Argon flow amount | Speed of welding |
| 45A | 18～24V | 350-400℃ | Φ2.0 | 8～10L/min | 60～80mm/min |
Find that this bi-material six kinds of test technology weldabilities under this welding parameter are better through test, fusion situation is more satisfactory;
(1), through sheet material overlay welding experiment, both discoveries expand and constriction coefficient suitable, heap postwelding sheet deformation is less, this illustrates in the Si Taili overlay cladding cold crack tendency of locator and seat ring little, can not cause that stress is excessive to be cracked in the solidification shrinkage process of postwelding molten bath because constriction coefficient is different.
(2), Rockwell hardness (HRC) inspection:
We carry out hardness test to the sample processing rear surface of the 6 groups of engineer testings drafted respectively, and average hardness statistics sees the following form 6:
Table 6 sample mean hardness statistical form
Test testpieces after 5 welding and heat treatment for table 4, overlay surface metal is the weld seam second layer, effectively ensure that top layer Si Taili metal purity and hardness;
Analyze known according to table 6 Rockwell hardness data, this surfacing stellite layer is without in heat treatment or 900 DEG C (combustion chamber operational temperature) destressing heat treatment process below, hardness affected by heat treatment is little, and surfacing hardness is all at about 55HRC, meet the 40HRC of drawing technical requirement completely, consider according to burner inner liner manufacturing process flow in addition, at locator, the parts assembly welding of these two surfacing stellites of mounting edge is after burner inner liner, also will through 1180 DEG C of pyroprocesses in postorder spray treatment process, therefore, also need test 6 to verify its weld seam firmness change situation in the case of a high temperature, although test data display 1180 DEG C of high temperature are to stellite weld hardness obvious effect, but its data still can meet the 40HRC of drawing technical requirement, even if therefore process sequence requires that weld seam has to pass through 1180 DEG C of high temperature, weld hardness still can meet product requirement, surfacing stellite layer hardness according to this Plotting data is shown in Fig. 3 with heat treatment temperature Changing Pattern,
(3), tissue tissue is made to obtain even refinement to a certain extent after the heat treatment of metallographic test display simultaneously, although although not heat treatment various aspects of performance is also up to standard, but still inevitably there is certain internal stress in weld seam, therefore still will select to heat-treat in technique.
6, process program is summed up
By right
many groups that on material, surfacing stellite the carries out metallographics tested, hardness data analysis and actual welding behaviour tests are done known:
1. weld according to welding parameter set in table 5, can be that weld seam fully fuses and ensures that tissue is good, therefore welding parameter can be decided to be this parameter;
2. stellite can prevent the generation of HOT CRACK FOR WELDING P effectively when hot weld, therefore combines the experience of stellite welding in the past, selects interlayer temperature to be 350-400 DEG C of hot weld;
3. surfacing stellite layer hardness is little in heat treatment temperature less than 900 DEG C change, and therefore post weld heat treatment temperature selects 850 DEG C × 2h of approximate burner inner liner bulk heat treatmet and burner inner liner actual work temperature;
To sum up, can obtain using Stellite-6 wlding to exist
the optimised welding procedure of the enterprising windrow weldering of mother metal, concrete welding and heat treatment process parameter see the following form 7:
Table 7 technological parameter
| Welding current | Weldingvoltage | Tungsten electrode size | Argon flow amount | The welding number of plies | Temperature between road | Speed of welding | Heat treatment temperature |
| 45A | 18～24V | Φ2.0 | 8～10L/min | 2 ~ 3 layers | 350-400℃ | 60～80mm/min | 850℃×2h |
(3) a kind of gas-turbine combustion chamber surfacing stellite method adopting above table 7 parameter to carry out this test with 5 in table 4 is specifically carried out according to the following steps:
One, volumn concentration is used to be that 99% ethanol water is conscientiously cleared up workpiece welding region before weldering;
Two, adopt stove equipment to workpiece heat to 400 DEG C and maintain the temperature at that this is interval;
Three, passing into purity with the flow velocity of 10L/min is that 99.9999% argon gas is protected, and then uses direct-flow argon-arc welder to weld workpiece; Wherein, described direct-flow argon-arc welder selects Φ 2.0 cerium tungsten electrode, and welding current is adjusted to 55A, and the wlding that described welding uses is the too vertical No. 6 cobalt base hard alloy welding wires of department, speed of welding 65mm/min, temperature 380 DEG C between road.
Four, after workpiece flawless weld defect, 2h is heat-treated to it; Wherein, described heat treatment method is: with 200 DEG C/time programming rate, workpiece is warming up to 850 DEG C, and be incubated 2 hours, again with 150 DEG C/time cooling rate, workpiece is cooled to less than 150 DEG C, then carries out the built-up welding that namely air cooling completes gas-turbine combustion chamber stellite;
Workpiece in this test is locator in gas-turbine combustion chamber and seat ring;
Stove equipment in step 2 in this test is DGHG type electric heating forced air drying drying baker, buys good from Wujiang for electric heating appliance Co., Ltd;
In step 3 in this test, direct-flow argon-arc welder model is DA300P AC/DC pulse tig welding machine, buys from Japanese OTC (Shanghai) company;
Fig. 4 is shown in by the welded specimen picture in kind of this test; Wherein A represents overlay cladding, and B represents mother metal
c represents overlay cladding ground floor, and D represents the overlay cladding second layer;
Metallographic test is carried out by the material object of this test welding:
After testing 5 welding and heat treatment by his-and-hers watches 4, testpieces is example, metallographic test result shows, gained weld seam macroscopic view and the equal flawless of microcosmic under all parameters, prove that these two kinds of materials (∏ 648 Л and stellite weld seam fusion welding metal) expand, constriction coefficient is similar to, weld seam, mother metal tissue, heat affected area and melt run even structure are stable, the metallographic structure of 5 is tested for table 4, display weld seam, mother metal tissue, heat affected area and each regional organization of melt run are all right, and Fig. 5 ~ Figure 12 is shown in by each region × 200 and × 500 metallographic structure photos;
As can be seen from metallograph:
(1) Si Taili surfacing layer is fine and closely woven compacts, and can ensure the hardness of weld seam;
(2) mother metal is not welded and destressing Effects of Heat Treatment substantially, ensures its original performance;
(3) heat affected area metallographic structure is even, stable and reliable for performance;
(4) melt run place metal alloying is all right, flawless.
Claims (8)
1. a gas-turbine combustion chamber surfacing stellite method, is characterized in that gas-turbine combustion chamber surfacing stellite method realizes according to the following steps:
One, volumn concentration is used to be that 97% ~ 100% ethanol water is cleared up workpiece welding region;
Two, adopt stove equipment to workpiece heat to 350 ~ 400 DEG C and maintain the temperature at that this is interval;
Three, pass into argon gas protection with the flow velocity of 8 ~ 10L/min, then use direct-flow argon-arc welder to weld workpiece; Wherein, described direct-flow argon-arc welder selects Φ 2.0 cerium tungsten electrode, and welding current is adjusted to 45 ~ 60A, and the wlding that described welding uses is the too vertical No. 6 cobalt base hard alloy welding wires of department, speed of welding 60 ~ 80mm/min, temperature 350 ~ 400 DEG C between road;
Four, after workpiece flawless weld defect, it is heat-treated; Wherein, described heat treatment method is: with 150 ~ 200 DEG C/time programming rate, workpiece is warming up to 840 ~ 860 DEG C, and be incubated 2 hours, again with 100 ~ 150 DEG C/time cooling rate, workpiece is cooled to less than 150 DEG C, then carries out the built-up welding that namely air cooling completes gas-turbine combustion chamber stellite.
2. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, the workpiece that it is characterized in that in step one is locator in gas-turbine combustion chamber and seat ring.
3. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, is characterized in that in step 2 workpiece heat to 360 ~ 390 DEG C.
4. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, is characterized in that the purity of argon 99.999% ~ 100% in step 3.
5. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, is characterized in that it being pass into argon gas with the flow velocity of 8.5 ~ 9.5L/min to carry out protecting in step 3.
6. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, is characterized in that in step 3, welding current is adjusted to 50 ~ 55A..
7. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, is characterized in that in step 3, speed of welding controls at 65 ~ 75mm/min.
8. a kind of gas-turbine combustion chamber surfacing stellite method according to claim 1, to is characterized in that in step 3 temperature 360 ~ 390 DEG C between road.
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| CN101384387B (en) * | 2006-02-15 | 2011-12-21 | 杰富意钢铁株式会社 | Iron-based powder mixture, and method of manufacturing iron-based compacted body and iron-based sintered body |
| CN105171186A (en) * | 2015-07-31 | 2015-12-23 | 武汉船用机械有限责任公司 | Welding method for conducting build up welding through stellite alloy |
| CN112276307B (en) * | 2020-10-20 | 2021-11-05 | 江苏利柏特股份有限公司 | Stellite alloy welding and heat treatment process for modular production |
| CN114029536B (en) * | 2021-12-15 | 2022-08-12 | 中国航发动力股份有限公司 | Clamp and method for surfacing layers on two side surfaces of boss of flame tube sleeve ring in plate welding |
| CN115213526A (en) * | 2022-06-23 | 2022-10-21 | 东方电气(广州)重型机器有限公司 | Method for overlaying wear-resistant layer on stainless steel workpiece |
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Effective date of registration: 20221230 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |