CN103817452B - A kind of trailing peening method of multi-pass welding - Google Patents
A kind of trailing peening method of multi-pass welding Download PDFInfo
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- CN103817452B CN103817452B CN201410100301.1A CN201410100301A CN103817452B CN 103817452 B CN103817452 B CN 103817452B CN 201410100301 A CN201410100301 A CN 201410100301A CN 103817452 B CN103817452 B CN 103817452B
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- weld seam
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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
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/003—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to controlling of welding distortion
Abstract
A trailing peening method for multi-pass welding, it relates to a kind of trailing peening method.The heat affected area grain coarsening that the object of the invention is to solve current multi-layer multi-pass welding is serious, thus can the serious technical problem reducing the mechanical property of welding point.Method of the present invention: the number of plies and the number of channels of one, determining multi-layer multi-pass welding; Two, determine the distance of hammer and welding gun, carry out the welding of first weld seam by trailing peening method, hammer will all melt runs of hammering first weld seam and whole heat affected area to the welding of first weld seam completes always; Three, determine the distance of hammer and welding gun and determine the distance of Weld pipe mill to be welded and adjacent Weld pipe mill, carrying out the welding of weld seam by trailing peening method; Four, repeat step 3 to whole treat that the welding of weldment groove completes.The present invention is mainly used in multi-layer multi-pass welding field.
Description
Technical field
The present invention relates to a kind of trailing peening method.
Background technology
Trailing peening method is as a kind of method controlling welding residual stress, reduce welding deformation, can thin-wall construction welding stress deformation be controlled with weldering and prevent the generation of fire check and cold crack, improve the tissue of welding point, improve its Static and dynamic mechanical property.The method, mainly by an impact head high-energy-rate hammering Seam and heat effected zone, makes the position of residual tension that plastic extension occur thus reaches the object eliminated welding residual stress, control buckling deformation.Trailing peening method equipment is simply light, and weldquality is good, and cost is low, and efficiency is high, has application prospect very widely.
The heat affected area grain coarsening of welding can the serious mechanical property reducing welding point, and as intensity and fracture toughness etc., especially in multi-layer multi-pass welding, intensity and the minimum position of fracture toughness all appear at the thermal stress strength repeatedly heated.Large quantity research shows, refinement heat affected area crystal grain is one of important way increasing welding joint mechanical property.
Summary of the invention
The heat affected area grain coarsening that the object of the invention is to solve current multi-layer multi-pass welding is serious, thus seriously can reduce the technical problem of the mechanical property of welding point, thus provides a kind of trailing peening method of multi-pass welding.
The trailing peening method of a kind of multi-pass welding of the present invention is carried out according to the following steps:
One, the number of channels of the number of plies and the welding of welding is determined;
Two, the welding of first weld seam is carried out: determine the distance d of first weld seam in welding process between hammer and welding gun according to the mother metal fusing point that the first weld-fusion line of first weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
1, hammer being arranged on distance after welding gun is d
1place, then adopts trailing peening method to carry out the welding of first weld seam with mounted welding gun and hammer, and hammer will all melt runs of hammering first weld seam and whole heat affected area to the welding of first weld seam completes always;
Three, the welding of N road weld seam is carried out:
(1), N road weld seam has the situation of melt run: determine that the distance of N road weld seam in welding process between hammer and welding gun is d according to the mother metal fusing point that the N road weld-fusion line of N road weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
n, hammer being arranged on distance after welding gun is d
nplace; The distance of all Weld pipe mill that N road Weld pipe mill is adjacent with N road weld seam is respectively determined according to the peak temperature of the melt run of all weld seams adjacent with N road weld seam in welding process of the N road weld seam mother metal fusing point that is 0.5 times ~ 0.8 times, then adopt trailing peening method to carry out the welding of N road weld seam with mounted welding gun and hammer, hammer will all melt runs of hammering N road weld seam and the welding of whole heat affected area to N road weld seam complete always;
(2), N road weld seam does not have the situation of melt run: when welding N road weld seam without hammer;
1. the situation of melt run is had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: in all weld seams adjacent with N road weld seam in the layer of weld seam place, N road, have the weld seam of melt run to be weld seam I or weld seam I and II, according to the peak temperature of N road weld seam melt run of weld seam I or weld seam I and II in the welding process mother metal fusing point that is 0.5 times ~ 0.8 times determine N road Weld pipe mill and weld seam I or respectively with the distance at weld seam I and II center, then carry out the welding of N road weld seam with welding gun;
2. the situation of melt run is not had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: the position that together with being welded on by N road weld seam with welding gun, weld seam is adjacent.
Four, repeat step 3 to whole treat that the welding of weldment groove completes;
N described in step 3 be greater than 1 integer; All first to carry out the welding of most both sides weld seam during the welding of every layer of weld seam, then weld to centre successively from most both sides, after every layer of welding completes, just can carry out the welding of lower one deck.
Melt run is the line of demarcation of weld metal and mother metal.
Principle of the present invention: the fundamental cause of welding heat affected zone grain coarsening is that field of welding temperature causes Jin Feng district crystal grain sharply to be grown up, trailing peening method can make heat affected area produce a large amount of plastic deformation in first welding process, and the temperature field of welding passage subsequently can make the heat affected area of distortion that recrystallization occurs.Parameter of the present invention mainly consider distance between hammer with welding gun and after together with the distance of weld seam together with front between weld seam, hammer distance welding gun is excessively near, can affect arc stability; Otherwise then reduced by hammering spot temperature, yield strength raises, and the amount of plastic deformation that hammering produces is too little; Hypotelorism between twice weld seam, the temperature field of rear one weld seam can make the position that plastic deformation has occurred complete rapidly recrystallization and grain growth process, and grain refining effect is not obvious; Otherwise then, one weld seam is lower in the temperature at hammering position, and recrystallization can not be carried out completely.The present invention is based on this principle take suitable welding operation parameter to reduce recrystallization after crystal grain sharply grow up, the object of refinement heat affected area crystal grain can be reached.
Advantage of the present invention:
1, method of the present invention is by trailing peening process application in multi-pass welding, can make heat affected area grain refinement 50%, has a significant effect for the mechanical property improving welding point;
2, method equipment of the present invention is simply light, and cost is low, can change adjustment amount of plastic deformation, reaching optimization process parameter by regulating hammering power and the two kinds of modes of the distance between hammer and welding gun.
Accompanying drawing explanation
Fig. 1 adopts the mother metal identical with test one to carry out the heat affected area microphoto after the TIG welding method of multi-pass welding;
Fig. 2 is mother metal stainless steel used in test one microphoto when not welding;
Fig. 3 is the microphoto that test one adopts heat affected area after the trailing peening method of multi-pass welding.
Detailed description of the invention
Detailed description of the invention one: in present embodiment, a kind of trailing peening method of multi-pass welding is carried out according to the following steps:
One, the number of channels of the number of plies and the welding of welding is determined;
Two, the welding of first weld seam is carried out: determine the distance d of first weld seam in welding process between hammer and welding gun according to the mother metal fusing point that the first weld-fusion line of first weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
1, hammer being arranged on distance after welding gun is d
1place, then adopts trailing peening method to carry out the welding of first weld seam with mounted welding gun and hammer, and hammer will all melt runs of hammering first weld seam and whole heat affected area to the welding of first weld seam completes always;
Three, the welding of N road weld seam is carried out:
(1), N road weld seam has the situation of melt run: determine that the distance of N road weld seam in welding process between hammer and welding gun is d according to the mother metal fusing point that the N road weld-fusion line of N road weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
n, hammer being arranged on distance after welding gun is d
nplace; The distance of all Weld pipe mill that N road Weld pipe mill is adjacent with N road weld seam is respectively determined according to the peak temperature of the melt run of all weld seams adjacent with N road weld seam in welding process of the N road weld seam mother metal fusing point that is 0.5 times ~ 0.8 times, then adopt trailing peening method to carry out the welding of N road weld seam with mounted welding gun and hammer, hammer will all melt runs of hammering N road weld seam and the welding of whole heat affected area to N road weld seam complete always;
(2), N road weld seam does not have the situation of melt run: when welding N road weld seam without hammer;
1. the situation of melt run is had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: in all weld seams adjacent with N road weld seam in the layer of weld seam place, N road, have the weld seam of melt run to be weld seam I or weld seam I and II, according to the peak temperature of N road weld seam melt run of weld seam I or weld seam I and II in the welding process mother metal fusing point that is 0.5 times ~ 0.8 times determine N road Weld pipe mill and weld seam I or respectively with the distance at weld seam I and II center, then carry out the welding of N road weld seam with welding gun;
2. the situation of melt run is not had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: the position that together with being welded on by N road weld seam with welding gun, weld seam is adjacent.
Four, repeat step 3 to whole treat that the welding of weldment groove completes;
N described in step 3 be greater than 1 integer; All first to carry out the welding of most both sides weld seam during the welding of every layer of weld seam, then weld to centre successively from most both sides, after every layer of welding completes, just can carry out the welding of lower one deck.
The advantage of present embodiment:
1, the method for present embodiment is by trailing peening process application in multi-pass welding, can make heat affected area grain refinement 50%, has a significant effect for the mechanical property improving welding point;
2, the method equipment of present embodiment is simply light, and cost is low, can change adjustment amount of plastic deformation, reaching optimization process parameter by regulating hammering power and the two kinds of modes of the distance between hammer and welding gun.
Detailed description of the invention two: present embodiment and detailed description of the invention one unlike: in steps described in the rated power of hammer be greater than 200W.Other are identical with detailed description of the invention one.
Detailed description of the invention three: one of present embodiment and detailed description of the invention one or two unlike: the mother metal fusing point being 0.4 times ~ 0.6 times according to the regional temperature of the first weld-fusion line of first weld seam hammer in welding process and whole heat affected areas in step 2 determines the distance d of first weld seam in welding process between hammer and welding gun
1, hammer being arranged on distance after welding gun is d
1place.Other are identical with one of 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 unlike: the mother metal fusing point being 0.6 times ~ 0.7 times according to the peak temperature of the melt run of all weld seams adjacent with N road weld seam in welding process of N road weld seam in step 3 (1) determines the distance of all Weld pipe mill that N road Weld pipe mill is adjacent with N road weld seam respectively.Other are identical with one of detailed description of the invention one to three.
Detailed description of the invention five: present embodiment and detailed description of the invention four unlike: the workpiece to be welded described in the step one described in step one is the mother metal of two pieces of identical materials.Other are identical with one of detailed description of the invention one to four.
Adopt following verification experimental verification effect of the present invention:
Test one: the trailing peening method of the multi-pass welding of this test is carried out according to the following steps:
One, according to the size of workpiece to be welded and the groove type of workpiece to be welded determine weld the number of plies be 1 layer and welding number of channels be 2 roads;
Two, the welding of first weld seam is carried out: determine the distance 35mm of first weld seam in welding process between hammer and welding gun according to the mother metal fusing point that the first weld-fusion line of first weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.6 times, hammer being arranged on distance after welding gun is 35mm place, then adopt trailing peening method to carry out the welding of first weld seam with mounted welding gun and hammer, hammer will all melt runs of hammering first weld seam and whole heat affected area to the welding of first weld seam completes always;
Three, the welding of second weld seam is carried out:
In this test, second weld seam has melt run: determine that the distance of second weld seam in welding process between hammer and welding gun is 35mm according to the mother metal fusing point that the second weld-fusion line of second weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.6 times, hammer being arranged on distance after welding gun is 35mm place; Determine that the distance of the first Weld pipe mill that second Weld pipe mill is adjacent with second weld seam is 12mm according to the mother metal fusing point that the peak temperature of the melt run of the first weld seam adjacent with second weld seam in welding process of second weld seam is 0.6 times, then adopt trailing peening method to carry out the welding of second weld seam with mounted welding gun and hammer, hammer will all melt runs of hammering second weld seam and whole heat affected area to the welding of second weld seam completes always; The mother metal groove of this test also welds end completely.
The rated power of the hammer described in this test is 200W.
Workpiece to be welded in this test described in step one is two blocks of stainless steels.
Fig. 1 adopts to test with this microphoto that identical mother metal carries out the heat affected area after the TIG welding method of multi-pass welding, Fig. 2 is mother metal stainless steel used in this test microphoto when not welding, Fig. 3 is the microphoto of heat affected area after the trailing peening method of this test employing multi-pass welding, the average grain size of heat affected area after the TIG welding of as can be seen from the figure multi-pass welding is about 80 μm, about the same when adopting the heat affected area crystallite dimension after the trailing peening method of the multi-pass welding of this test not weld with mother metal stainless steel used in this test, mean value is 40 μm, thus can find out that the trailing peening method of the multi-pass welding of this test is less by 50% than the crystal grain of the heat affected area after other conventional methods welding of multi-pass welding, thus the mechanical property of welding point can be improved.
Vickers hardness analysis detection is carried out to the material in Fig. 1, Fig. 2 and Fig. 3, the load doing pressure head when Vickers hardness test is 0.2kg, the Vickers hardness that result shows the material in Fig. 1 is 25Hv0.2, the Vickers hardness of the material in Fig. 2 is 70Hv0.2, the Vickers hardness of the material in Fig. 3 is 70Hv0.2, because hardness is larger, crystal grain is less, so the trailing peening method of the multi-pass welding of this test is less than the crystal grain of the heat affected area after other conventional methods welding of multi-pass welding, thus the mechanical property of welding point can be improved.
Claims (5)
1. a trailing peening method for multi-pass welding, is characterized in that the trailing peening method of multi-pass welding is carried out according to the following steps:
One, the number of channels of the number of plies and the welding of welding is determined;
Two, the welding of first weld seam is carried out: determine the distance d of first weld seam in welding process between hammer and welding gun according to the mother metal fusing point that the first weld-fusion line of first weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
1, hammer being arranged on distance after welding gun is d
1place, then adopts trailing peening method to carry out the welding of first weld seam with mounted welding gun and hammer, and hammer will all melt runs of hammering first weld seam and whole heat affected area to the welding of first weld seam completes always;
Three, the welding of N road weld seam is carried out:
(1), N road weld seam has the situation of melt run: determine that the distance of N road weld seam in welding process between hammer and welding gun is d according to the mother metal fusing point that the N road weld-fusion line of N road weld seam hammer in welding process and the regional temperature of whole heat affected area are 0.2 times ~ 0.8 times
n, hammer being arranged on distance after welding gun is d
nplace; The distance of all Weld pipe mill that N road Weld pipe mill is adjacent with N road weld seam is respectively determined according to the peak temperature of the melt run of all weld seams adjacent with N road weld seam in welding process of the N road weld seam mother metal fusing point that is 0.5 times ~ 0.8 times, then adopt trailing peening method to carry out the welding of N road weld seam with mounted welding gun and hammer, hammer will all melt runs of hammering N road weld seam and the welding of whole heat affected area to N road weld seam complete always;
(2), N road weld seam does not have the situation of melt run: when welding N road weld seam without hammer;
1. the situation of melt run is had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: in all weld seams adjacent with N road weld seam in the layer of weld seam place, N road, have the weld seam of melt run to be weld seam I or weld seam I and II, according to the peak temperature of N road weld seam melt run of weld seam I or weld seam I and II in the welding process mother metal fusing point that is 0.5 times ~ 0.8 times determine N road Weld pipe mill and weld seam I or respectively with the distance at weld seam I and II center, then carry out the welding of N road weld seam with welding gun;
2. the situation of melt run is not had in adjacent with N road weld seam in the layer of weld seam place, N road weld seam: the position that together with being welded on by N road weld seam with welding gun, weld seam is adjacent;
Four, repeat step 3 to whole treat that the welding of weldment groove completes;
N described in step 3 be greater than 1 integer; All first to carry out the welding of most both sides weld seam during the welding of every layer of weld seam, then weld to centre successively from most both sides, after every layer of welding completes, just can carry out the welding of lower one deck.
2. the trailing peening method of a kind of multi-pass welding according to claim 1, it is characterized in that in steps described in the rated power of hammer be greater than 200W.
3. the trailing peening method of a kind of multi-pass welding according to claim 1, is characterized in that the mother metal fusing point being 0.4 times ~ 0.6 times according to the regional temperature of the first weld-fusion line of first weld seam hammer in welding process and whole heat affected areas in step 2 determines the distance d of first weld seam in welding process between hammer and welding gun
1, hammer being arranged on distance after welding gun is d
1place.
4. the trailing peening method of a kind of multi-pass welding according to claim 1, is characterized in that the peak temperature of the melt run of all weld seams adjacent with N road weld seam in welding process according to N road weld seam in step 3 (1) is the distance that the mother metal fusing point of 0.6 times ~ 0.7 times determines all Weld pipe mill that N road Weld pipe mill is adjacent with N road weld seam respectively.
5. the trailing peening method of a kind of multi-pass welding according to claim 1, is characterized in that the workpiece to be welded described in step one is the mother metal of two pieces of identical materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410100301.1A CN103817452B (en) | 2014-03-18 | 2014-03-18 | A kind of trailing peening method of multi-pass welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410100301.1A CN103817452B (en) | 2014-03-18 | 2014-03-18 | A kind of trailing peening method of multi-pass welding |
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| CN103817452B true CN103817452B (en) | 2015-10-28 |
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| CN104722978B (en) * | 2015-03-30 | 2016-04-27 | 广东省工业技术研究院(广州有色金属研究院) | A kind of Portable welding Deformation control equipment and deformation processing method thereof |
| CN111822860A (en) * | 2020-06-10 | 2020-10-27 | 南京航空航天大学 | Method for accurately controlling double-laser-beam bilateral synchronous welding deformation of T-shaped structure |
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| CN101138817A (en) * | 2007-10-12 | 2008-03-12 | 哈尔滨工业大学 | Device for controlling welding stress deformation along with soldering impact, revolving and extrusion pressing |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4987816B2 (en) * | 2008-07-28 | 2012-07-25 | 新日本製鐵株式会社 | Automatic impact processing method and automatic impact processing apparatus for improving the fatigue characteristics of welded joints |
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- 2014-03-18 CN CN201410100301.1A patent/CN103817452B/en not_active Expired - Fee Related
Patent Citations (3)
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|---|---|---|---|---|
| CN2709083Y (en) * | 2004-07-19 | 2005-07-13 | 河北农业大学 | Parameter regulatable bammer blow device along with welding |
| CN1927530A (en) * | 2006-09-29 | 2007-03-14 | 哈尔滨工业大学 | Apparatus for controlling welding stress deformation depending on welding friction extrusion |
| CN101138817A (en) * | 2007-10-12 | 2008-03-12 | 哈尔滨工业大学 | Device for controlling welding stress deformation along with soldering impact, revolving and extrusion pressing |
Non-Patent Citations (1)
| Title |
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| 随焊锤击防止薄板焊接热裂纹的工艺研究;方洪渊等;《焊接》;20020325(第3期);第17-20页 * |
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