CN103008833A - Surfacing method for antiseptic wear-resisting layer of dovetail groove - Google Patents
Surfacing method for antiseptic wear-resisting layer of dovetail groove Download PDFInfo
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Abstract
The invention discloses a surfacing method for an antiseptic wear-resisting layer of a dovetail groove. According to the method, two dovetail groove workpieces are spot-welded back to back, slant groove surfaces and horizontal groove surfaces of the upper dovetail groove workpiece and the lower dovetail groove workpiece are alternately skip-welded sectionally at intervals by ER410NiMoTi surfacing material, welding residual stress is eliminated through heat treatment, and finally the two dovetail groove workpieces are separated, corrected and roughly machined. According to the surfacing method disclosed by the invention, welding deformation can be effectively avoided, and the formed surfacing layer can improve the antiseptic wear-resisting performance of the dovetail groove.
Description
Technical field
The present invention relates to technique for overlaying, more particularly, relate to a kind of overlaying method of dovetail groove anticorrosion antiwear layer.
Background technology
Subtract the important production equipment that machine is steel pipe's production enterprise, at present general imported product, after long-time the use, its susceptor surface, particularly lip-deep dovetail groove wearing and tearing, corrosion are very serious, can't keep and continue to use.Coordination through equipment management personnel and production scene, decision are made to begin doing business and are subtracted machine, and improve its service life.
See also shown in Figure 1ly, Fig. 1 is for subtracting the test value table of machine base chemical composition, and as seen the chemical composition that subtracts machine base chemical composition and Q235 steel of this import is approaching.The Q235 steel is conventional steel, and its anti-wear performance and decay resistance are not high, therefore is in for a long time in the working environment of sposh shape greasy dirt, very easily corrode and wear and tear, therefore, improve a service life that subtracts machine, need to consider from the combination property of corrosion and wearing and tearing.And carry out the making of surface abrasion resistance, anticorrosive coat for subtracting machine base surface dovetail groove, because its area is larger, need not only to consider that suitable resurfacing welding material to satisfy corresponding performance requirement, more will consider large-area built-up welding to the control of welding deformation, thereby difficulty is larger.
Summary of the invention
For the above-mentioned shortcoming that exists in the prior art, the purpose of this invention is to provide a kind of overlaying method of dovetail groove anticorrosion antiwear layer, can avoid occuring welding deformation, improve the anticorrosion antiwear performance of dovetail groove.
For achieving the above object, the present invention adopts following technical scheme:
The overlaying method of this dovetail groove anticorrosion antiwear layer may further comprise the steps:
A. two dovetail groove workpiece are back-to-back spot-welded together, form laterally zygomorphic version;
B. to the section gap skip welding that hockets of the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face;
C. the dovetail groove workpiece after the built-up welding is heat-treated, to eliminate welding residual stress;
D. two dovetail groove workpiece spot-welded together are separated, and use hydraulic press to carry out orthopedic to the dovetail groove workpiece that distortion is arranged;
E. the dovetail groove workpiece after separating is carried out roughing.
In step B, it is that ER410NiMoTi, diameter are the solid core welding wire of 1.2mm that material is adopted in described built-up welding, and adopts CO
2With the mist of Ar be the built-up welding protective gas, welding current is 200～280A, weldingvoltage is 24～31V, built-up welding thickness is 2～4cm.
In step B, concrete built-up welding step is as follows:
B1. on the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face, divide respectively a plurality of sections;
B2. the dovetail groove workpiece is preheated to 250～300 ℃;
B3. carry out the section gap skip welding according to the order of both sides section behind first up and then down, the first interlude, until all overlaying surface all are soldered one time;
B4. adopt the stress-removal instrument that each overlaying surface is done the processing that eliminates stress;
B5. repeating step B3, B4 carry out built-up welding number time, until built-up welding thickness reaches setting thickness.
In step C, described heat treated concrete steps are as follows:
C1. the dovetail groove workpiece is put in the heat-treatment furnace, begins to warm to 300 ℃ of insulations 2 hours;
C2. heat with the temperature rise speed less than 80 ℃ per hour, until be warmed up to 530 ℃, stop to heat up, begin insulation;
C3. after 6 hours, make heat-treatment furnace begin cooling per hour to lower the temperature less than 60 ℃ temperature drop speed 530 ℃ of this temperature insulations, until drop to 300 ℃, the dovetail groove workpiece is come out of the stove and is carried out air cooling.
In step D, the dovetail groove workpiece after separating is surveyed linearity, when the linearity of dovetail groove workpiece during greater than 1mm, carry out orthopedic.
In technique scheme, the overlaying method of dovetail groove anticorrosion antiwear layer of the present invention is by back-to-back spot-welded together with two dovetail groove workpiece, and the resurfacing welding material of employing ER410NiMoTi, to the section gap skip welding that hockets of the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face, again by heat treatment to eliminate welding residual stress, separate at last two dovetail groove workpiece, orthopedic and roughing.Adopt overlaying method of the present invention, can effectively avoid occuring welding deformation, and the overlay cladding that forms can improve the anticorrosion antiwear performance of dovetail groove.
Description of drawings
Fig. 1 opens to subtract machine base material chemical composition analytical table;
Fig. 2 is flow chart of the present invention;
Fig. 3 is back-to-back structural representations spot-welded together of two dovetail groove workpiece of the present invention;
Fig. 4 is the side view of Fig. 1;
Fig. 5 is the instance graph of the division section of overlaying surface of the present invention (inclined trough surface or horizontal plane);
Fig. 6 is heat treatment temperature broken line graph of the present invention.
The specific embodiment
Further specify technical scheme of the present invention below in conjunction with drawings and Examples.
See also shown in Figure 2ly, the overlaying method of dovetail groove anticorrosion antiwear layer of the present invention specifically may further comprise the steps:
A. two dovetail groove workpiece are back-to-back spot-welded together, form laterally zygomorphic version;
B. to the section gap skip welding that hockets of the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face;
C. the dovetail groove workpiece after the built-up welding is heat-treated, to eliminate welding residual stress;
D. two dovetail groove workpiece spot-welded together are separated, and use hydraulic press to carry out orthopedic to the dovetail groove workpiece that distortion is arranged;
E. the dovetail groove workpiece after separating is carried out roughing.
See also Fig. 3, shown in Figure 4, in steps A, the dovetail groove that adopts is (4500 * 495 * 300mm) two of large thickness workpiece a, when estimating its inclined trough surface b built-up welding deflection can be very not large (built-up welding is of a size of 4500 * 300 * 7mm), larger welding deformation can occur when rising as high as the banks face c built-up welding, and (built-up welding is of a size of 4500 * 250 * 7mm), and deposited metal is 290Kg.Therefore, two dovetail groove workpiece a are leaned against privately weld together, form laterally zygomorphic version, control the built-up welding distortion by following built-up welding order.
See also shown in Figure 5ly, in step B, on the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face, divide respectively first the built-up welding section of a plurality of five equilibriums.For example in Fig. 5, the inclined trough surface of two dovetail groove workpiece and horizontal groove face have been divided 15 sections (can directly setting-out on workpiece) respectively.When built-up welding makes, decide minute which floor built-up welding (built-up welding pass) according to the built-up welding thickness of work wearing layer allowance.At first workpiece is preheating to 250-300 ℃, then, by two welders according to first up and then down, first interlude after the order of both sides section carry out the section gap skip welding, until all overlaying surface all are soldered one time, namely first to 7 and 9 of the inclined trough surface of upper dovetail groove workpiece; 5 and 11; 3 and 13; 1 and 15 sections carry out successively skip welding, then successively the inclined trough surface of the horizontal groove face of upper dovetail groove workpiece, lower dovetail groove workpiece, horizontal groove face are carried out skip welding (two overlaying surface of lower dovetail groove workpiece need overturn built-up welding) with same order; Afterwards to 8 of the inclined trough surface of upper dovetail groove workpiece; 6 and 10; 4 and 12; 2 and 14 sections carry out successively skip welding, equally again all the other overlaying surface are carried out skip welding, finish the built-up welding of first pass.First pass (ground floor) built-up welding is done the processing that eliminates stress with the stress-removal instrument to overlaying surface after finishing, to eliminate the part welding stress.Then, carry out equally again second time section gap skip welding with this, constantly repeat, until satisfy the built-up welding thickness (being generally two to three times gets final product) of setting, adopt above-mentioned built-up welding order and mode, can effectively avoid occuring welding deformation.
And the basic technology of whole weld deposit process requires: because the built-up welding amount is very large, as adopting SMAW, then the duration is very long; As adopt submerged-arc welding, then distortion is difficult to control more; Therefore it is that ER410NiMoTi, diameter are the solid core welding wire of 1.2mm that material is adopted in built-up welding of the present invention, and adopt CO
2With the mist of Ar be the built-up welding protective gas, to increase the stability of electric arc, welding current is 200～280A, weldingvoltage is 24～31V, the built-up welding thickness setting is 2～4cm.
See also shown in Figure 6ly, the dovetail groove workpiece after the built-up welding also needs to heat-treat, and its main effect has two aspects, and the first, can reduce the welding process residual stress, reduce the distortion of built-up welding dovetail groove; The second, guarantee welding quality.Through the heat treatment temperature of above-mentioned resurfacing welding material has been carried out simple test, finding 530 ℃ is inflection temperature, and when heat treatment temperature was higher than 530 ℃, the hardness of material began to reduce.In order to guarantee wearability, heat treatment temperature is defined as 530 ℃.Whole heat treatment process is: at first the dovetail groove workpiece is put in the heat-treatment furnace, begins to heat up, be warmed up to 300 ℃ of insulations 2 hours; Then with the temperature rise speed heating of each hour less than 80 ℃, be warmed up to 530 ℃ always, stop to heat up, begin insulation, 530 ℃ of this temperature insulations 6 hours, the after-baking stove began cooling in 6 hours, with the temperature drop speed cooling of each hour less than 60 ℃, drop to 300 ℃ always, again the dovetail groove workpiece is come out of the stove, Slow cooling in air.
After heat treatment is finished, by the carbon plane two dovetail groove workpiece spot-welded together are separated.In order to guarantee overlay cladding thickness and to reduce the difficulty of follow-up machining, need to press on the dovetail slotware that deform is orthopedic.Namely when the linearity that detects the dovetail groove workpiece during greater than 1mm, use 800 tons of hydraulic presses to carry out orthopedic, make its linearity less than 1mm.The item that following points should be noted that when in addition, orthopedic:
When hydraulic press was pressed, the span of two fulcrums had important impact, at the beginning the span of two fulcrums greatly between 4.7-6 rice, press several times after, this moment, hydraulic press was in maximum load, can't continue to press and rectify; Then adjust the fulcrum span to approximately 9 meters, again press and rectify, through after the several times compacting (pressure is maximum load), measure distortion (stay cord method), orthopedic amount obviously increases.Press when rectifying, higher to the status requirement of fulcrum, below fulcrum, be the cement flooring, the pressure that generally bears is very little, if therefore pressure is large, need to fill up on the ground a bulk of steel plate.
At last, the dovetail groove workpiece behind the aligning is carried out respectively roughing, two dovetail groove workpiece after the roughing can be symmetricly set in to open and subtract on the machine base surface.
Adopt overlaying method of the present invention, not only can prevent the problem that deforms in the weld deposit process, and the anticorrosion antiwear performance that the overlay cladding that forms can also the Effective Raise dovetail groove, prolonged a service life that subtracts machine.
Those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.
Claims (5)
1. the overlaying method of a dovetail groove anticorrosion antiwear layer is characterized in that, may further comprise the steps:
A. two dovetail groove workpiece are back-to-back spot-welded together, form laterally zygomorphic version;
B. to the section gap skip welding that hockets of the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face;
C. the dovetail groove workpiece after the built-up welding is heat-treated, to eliminate welding residual stress;
D. two dovetail groove workpiece spot-welded together are separated, and use hydraulic press to carry out orthopedic to the dovetail groove workpiece that distortion is arranged;
E. the dovetail groove workpiece after separating is carried out roughing.
2. the overlaying method of dovetail groove anticorrosion antiwear layer as claimed in claim 1 is characterized in that:
In step B, it is that ER410NiMoTi, diameter are the solid core welding wire of 1.2mm that material is adopted in described built-up welding, and adopts CO
2With the mist of Ar be the built-up welding protective gas, welding current is 200～280A, weldingvoltage is 24～31V, built-up welding thickness is 2～4cm.
3. the overlaying method of dovetail groove anticorrosion antiwear layer as claimed in claim 1 or 2 is characterized in that:
In step B, concrete built-up welding step is as follows:
B1. on the inclined trough surface of two dovetail groove workpiece up and down and horizontal groove face, divide respectively a plurality of sections;
B2. the dovetail groove workpiece is preheated to 250～300 ℃;
B3. carry out the section gap skip welding according to the order of both sides section behind first up and then down, the first interlude, until all overlaying surface all are soldered one time;
B4. adopt the stress-removal instrument that each overlaying surface is done the processing that eliminates stress;
B5. repeating step B3, B4 carry out built-up welding number time, until built-up welding thickness reaches setting thickness.
4. the overlaying method of dovetail groove anticorrosion antiwear layer as claimed in claim 1 is characterized in that:
In step C, described heat treated concrete steps are as follows:
C1. the dovetail groove workpiece is put in the heat-treatment furnace, begins to warm to 300 ℃ of insulations 2 hours;
C2. heat with the temperature rise speed less than 80 ℃ per hour, until be warmed up to 530 ℃, stop to heat up, begin insulation;
C3. after 6 hours, make heat-treatment furnace begin cooling per hour to lower the temperature less than 60 ℃ temperature drop speed 530 ℃ of this temperature insulations, until drop to 300 ℃, the dovetail groove workpiece is come out of the stove and is carried out air cooling.
5. the overlaying method of dovetail groove anticorrosion antiwear layer as claimed in claim 5 is characterized in that:
In step D, the dovetail groove workpiece after separating is surveyed linearity, when the linearity of dovetail groove workpiece during greater than 1mm, carry out orthopedic.
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Cited By (6)
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| CN103480993A (en) * | 2013-09-27 | 2014-01-01 | 国家电网公司 | Welding method capable of eliminating welding stress and for reloading technological cover plate of turbine |
| CN105405629A (en) * | 2015-11-20 | 2016-03-16 | 南通弘峰机电有限公司 | Processing process of base for large-scale transformer |
| CN110434457A (en) * | 2019-07-19 | 2019-11-12 | 中车青岛四方机车车辆股份有限公司 | Laser double-surface welder and its laser double-surface welding method |
| CN110681973A (en) * | 2019-09-30 | 2020-01-14 | 鞍钢股份有限公司 | Vacuum electron beam seal welding method for composite blank for rolling composite plate |
| CN113000985A (en) * | 2019-12-20 | 2021-06-22 | 无锡华光锅炉股份有限公司 | Automatic surfacing process for surface of membrane type wall tube panel |
| CN113732453A (en) * | 2021-09-17 | 2021-12-03 | 上海睿昇半导体科技有限公司 | Welding processing method and application of vacuum cooling system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103480993A (en) * | 2013-09-27 | 2014-01-01 | 国家电网公司 | Welding method capable of eliminating welding stress and for reloading technological cover plate of turbine |
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| CN105405629A (en) * | 2015-11-20 | 2016-03-16 | 南通弘峰机电有限公司 | Processing process of base for large-scale transformer |
| CN110434457A (en) * | 2019-07-19 | 2019-11-12 | 中车青岛四方机车车辆股份有限公司 | Laser double-surface welder and its laser double-surface welding method |
| CN110681973A (en) * | 2019-09-30 | 2020-01-14 | 鞍钢股份有限公司 | Vacuum electron beam seal welding method for composite blank for rolling composite plate |
| CN110681973B (en) * | 2019-09-30 | 2021-08-20 | 鞍钢股份有限公司 | Vacuum electron beam seal welding method for composite blank for rolling composite plate |
| CN113000985A (en) * | 2019-12-20 | 2021-06-22 | 无锡华光锅炉股份有限公司 | Automatic surfacing process for surface of membrane type wall tube panel |
| CN113000985B (en) * | 2019-12-20 | 2024-02-09 | 无锡华光环保能源集团股份有限公司 | Automatic surfacing process for surface of membrane type wall tube panel |
| CN113732453A (en) * | 2021-09-17 | 2021-12-03 | 上海睿昇半导体科技有限公司 | Welding processing method and application of vacuum cooling system |
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