CN110102859A - A kind of tube sheet penetration type prosposition MAG weldering one side welding with back formation technique - Google Patents
A kind of tube sheet penetration type prosposition MAG weldering one side welding with back formation technique Download PDFInfo
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- CN110102859A CN110102859A CN201910256115.XA CN201910256115A CN110102859A CN 110102859 A CN110102859 A CN 110102859A CN 201910256115 A CN201910256115 A CN 201910256115A CN 110102859 A CN110102859 A CN 110102859A
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- welding
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- tube sheet
- prosposition
- penetration type
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Classifications
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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
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
- B23K33/004—Filling of continuous seams
-
- 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
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/38—Selection of media, e.g. special atmospheres for surrounding the working area
- B23K35/383—Selection of media, e.g. special atmospheres for surrounding the working area mainly containing noble gases or nitrogen
-
- 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
- B23K9/173—Arc welding or cutting making use of shielding gas and of a consumable electrode
-
- 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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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a kind of tube sheet penetration type prosposition MAG weld one side welding with back formation technique, which comprises the steps of: S1: selection, S2: machining test specimen, S3: group to positioning, S4: welding, S5: postwelding examine.Of the present invention group should be in back of weld to positioning, using saddle connection type, it prevents from destroying groove and reducing connector defect generating, prime coat, filled layer and capping layer should respectively use oblique arc-shaped, zigzag, anti-crescent arc manipulation method and be maintained at welding direction angle in welding process rifle angle as 80 ° -90 °, angle with pipe circumference is 30 ° or so, reasonable technological parameter and control heat input, temperature is at 150 DEG C hereinafter, reducing the residual of welding stress using hammering method between control layer road.
Description
Technical field
The present invention relates to a kind of larger range, specifically a kind of tube sheet penetration type prosposition MAG welds one side welding with back formation work
Skill.
Background technique
During rail traffic bogie production International Welding Qualification Examination and procedure qualification, Chang You MAG welded tube plate is passed through
The welding of through structure, product and examination quality require high, it has to be warranted that one side welding with back formation and internal soundness is excellent,
Therefore reasonable welding procedure and operation technique are to ensure that penetration type weld is accepted is crucial.
One: penetration type structural shape is irregular, and heat transfer in the welding process is uneven, easily leads to the back of prime coat weld seam
Facial canal side generates serious incomplete fusion phenomenon.
Two: in welding process, due to iron rust, greasy dirt and layer it is clear between cleaning be not thorough or angle of welding gun is unreasonable is easy to cause
Generation incomplete fusion between interlayer or weld seam and pipe side, will not crack under normal circumstances, but bogie structure uses Q345B
With the different steel weld of 35# steel, thickness of steel product is bigger, environment temperature is lower, heat input is excessive or interlayer temperature control not
Reasonable situation has crackle tendency.
Three: due to structural particularity, welding gun rifle mouth is restricted, and in welding, welding gun is difficult to reach groove root, can only
It is realized by lengthening electrode extension, electric arc is not sufficiently stable and gas shield is bad can generate stomata when welding；In addition, weldering
Moisture content, the cleaning oil pollution at the place of connecing completely are not also the reason of causing weld blowhole.
Four: due to welding parameter, angle of welding gun and manipulation of electrode it is unreasonable easily cause backplate side (prime coat), front
(capping layer) two sides undercut phenomenon, in welding process, if prime coat throat depth is excessively thin, cooling velocity is too fast, easily causes weld seam
Become fragile, affects the mechanical properties.
Summary of the invention
The purpose of the present invention is to provide a kind of tube sheet penetration type prosposition MAG to weld one side welding with back formation technique, to solve
The problems mentioned above in the background art.
To achieve the above object, the invention provides the following technical scheme:
A kind of tube sheet penetration type prosposition MAG weldering one side welding with back formation technique, which comprises the steps of:
S1: the tube sheet penetration type groove weld structure of plate Q345B and pipe 35# steel are chosen；
S2: machining test specimen: test tube size are as follows: D60mm*200mm*14mm, test plate (panel) size are as follows: 160mm*160mm*
14mm, plate processes Φ 65mm centre bore, and plate is by 50 ° of grooves of centre bore addition；By groove and weld seam two sides 30-50mm range
Interior machinery is cleared up, and goes water removal, oil and oxide on surface up to metallic luster, to prevent plate side burn-through, by plate centre bore slope
Mouth polishing 1-1.5mm root face；
S3: group is to positioning: corresponding shape-setting clamp is chosen, between three, groove back side location point uniform location, root
Gap is 3-4mm, and ensures that gap is uniform, again removes saddle plate after prime coat is soldered；
S4: welding first preheats weld seam, and prime coat is using tiltedly arc-shaped manipulation of electrode, when torch swinging to pipe
It has to welding wire extending to back when side hereinafter, allowing electric arc in base burning, filled layer uses zigzag arc manipulation, with Guan Yuanwei
Center, two sides slightly stop, it is ensured that pipe, the fusion of plate side are good；Capping layer uses anti-moon shape arc manipulation method；
S5: it after completion to be welded, is being detected.
As further scheme of the invention: the welding method is to dissolve pole inert gas-shielded arc welding (MAG-
135), welding equipment model NBC-350, welding material ER50-6, welding wire specification are φ 1.0, protective gas 80%Ar
And 20%CO2。
As further scheme of the invention: using clockwise direction welding method, the work angle of welding gun and plate when welding
(welding direction) is 80 ° -90 °, and the angle of welding gun and pipe is maintained at 30 ° always by the circularity variation of welding angle root Ju pipe.
As further scheme of the invention: then the inspection after welding, first progress metallographic test carry out hard again
Degree detection.
As further scheme of the invention: the weld seam preheating condition works as plate thickness before being Q345B and the welding of 35# steel
When spending 25mm or more or environment temperature lower than 5 DEG C, 100-150 DEG C of preheating should be carried out.
Compared with prior art, the beneficial effects of the present invention are:
1, group should prevent from destroying groove and reducing connector defect producing to positioning in back of weld, using saddle connection type
It is raw.
2, prime coat, filled layer and capping layer using oblique arc-shaped, zigzag, anti-crescent arc manipulation method and should respectively weld
It is 80 ° -90 ° that termination process rifle angle, which is maintained at welding direction angle, and the angle with pipe circumference is 30 ° or so.
3, reasonable technological parameter and control heat input, temperature is at 150 DEG C hereinafter, being subtracted using hammering method between control layer road
The residual of few welding stress.
Detailed description of the invention
Fig. 1 is a kind of distribution map for the anchor point that tube sheet penetration type prosposition MAG welds one side welding with back formation technique；
Fig. 2 is that a kind of tube sheet penetration type prosposition MAG welds saddle type positioning mode structural representation in one side welding with back formation technique
Figure；
Fig. 3 is that a kind of tube sheet penetration type prosposition MAG welds welding layer (road) structural representation in one side welding with back formation technique
Figure；
Fig. 4 is that a kind of tube sheet penetration type prosposition MAG welds angle of welding gun structural schematic diagram in one side welding with back formation technique；
Fig. 5 is that a kind of tube sheet penetration type prosposition MAG welds prime coat, filled layer and capping layer in one side welding with back formation technique
Arc manipulation method figure；
Fig. 6 is that a kind of tube sheet penetration type prosposition MAG welds macroscopical metallographic qualification schematic diagram in one side welding with back formation technique；
Fig. 7 is that a kind of tube sheet penetration type prosposition MAG welds hardness test result schematic diagram in one side welding with back formation technique.
Specific embodiment
In the embodiment of the present invention, as shown in figs. 1-7, a kind of tube sheet penetration type prosposition MAG weldering one side welding with back formation technique,
It is characterized by comprising the following steps:
S1: the tube sheet penetration type groove weld structure of plate Q345B and pipe 35# steel are chosen；
S2: machining test specimen: test tube size are as follows: D60mm*200mm*14mm, test plate (panel) size are as follows: 160mm*160mm*
14mm, plate processes Φ 65mm centre bore, and plate is by 50 ° of grooves of centre bore addition；By groove and weld seam two sides 30-50mm range
Interior machinery is cleared up, and goes water removal, oil and oxide on surface up to metallic luster, to prevent plate side burn-through, by plate centre bore slope
Mouth polishing 1-1.5mm root face；
S3: group is to positioning: as depicted in figs. 1 and 2, corresponding shape-setting clamp is chosen, in three, groove back side location point
Uniform location, root gap 3-4mm, and ensure that gap is uniform, saddle plate is removed again after prime coat is soldered；
S4: as illustrated in figures 4-5, the arc manipulation gimmick of welding gun is to ensure that welding quality key in welding process, and prime coat uses
Tiltedly arc-shaped manipulation of electrode, has to welding wire extending to back hereinafter, allowing electric arc in bottom when torch swinging to pipe side
Burning, to guarantee that through welding and the fusion of pipe side are good, filled layer uses zigzag arc manipulation, and centered on Guan Yuan, two sides are slightly stopped,
Ensure that pipe, the fusion of plate side are good, capping layer uses anti-moon shape arc manipulation method, to prevent the incomplete fusion defect of the undercut of plate side Yu pipe side
It generates, clockwise direction welding method is used in welding, the work angle (welding direction) of welding gun and plate is 80 ° -90 °, welds angle
The angle of welding gun and pipe is maintained at 30 ° or so always by the circularity variation of root Ju pipe, weld seam can be made to fuse with tube sheet two sides good
It is good.
S5: after completion to be welded, being detected, as shown below: inspection after welding, first progress metallographic test, with
Amplify 6 times of section macroscopic view metal lographic examination weld metal zones, heat affected area and base material area, should all be without exception,
It is as shown in Figure 7: and then to carry out hardness determination again, use graticule measurement technique in test temperature for 19.7 DEG C, pressure
Detect that hardness result is met the requirements under conditions of retention time 10s.
As shown in Table 1: welding method is to dissolve pole inert gas-shielded arc welding (MAG-135), welding equipment model NBC-
350, welding material ER50-6, welding wire specification are φ 1.0, and protective gas is 80%Ar and 20%CO2。
1 welding method of table, welding equipment, welding material selection
Penetration type tube sheet groove welding belongs to a kind of structure type that docking is combined with corner connection, there is certain particularity,
It should be noted that the following in welding process:
1. the preheating and post weld heat treatment of weld seam；Under normal circumstances when plate thickness is no more than before the welding of Q345B and 35# steel
25mm, environment temperature can be without preheating and post weld heat treatment when being not less than 5 DEG C.Thickness 25mm or more or environment temperature are lower than 5
DEG C when should carry out preheating 100-150 DEG C.
2. the reasonable adjusting of welding parameter；In welding process can root Ju personal considerations with the starting the arc, welding, receive arc current etc.
Function, slightly larger striking current can guarantee that the rapid increase of weld seam temperature, welding current should be with welding wire melting rate and welding speed
Degree matches, and lesser receipts arc current, which can ensure that, fills up arc crater, prevents crater crack from generating.
3. strict control welding temperature and interlayer temperature；In welding process, speed of welding and heat input should be controlled, is controlled
Every layer of weld seam temperature, which is down to 150 DEG C or less, can carry out next layer (road) welding.
4. starting, connector, the processing for receiving arc；The starting of prime coat, connector, receive forearc must be with small steel bistrique by junction
Wear down melts poroid convenient for connection at angle and formation.The starting the arc is pressed directly into pipe side bottom on the groove face of connector Shi Yingcong plate side,
Realize normal arc manipulation again after fusing with pipe.
5. the processing between layer road；It is good to guarantee to fuse between layer road, all should strictly be cleared up between layer road, polish flat connector and
The slightly higher position in junction prevents slag inclusion, is mingled with phenomenon generation, hammered into shape and tapped with small round head in interlayer, discharge welding stress, prevented
Crack arrest line generates.
Welding layer (road) number and technological parameter as shown in table 2
Group should prevent from destroying groove and reducing connector defect generating to positioning in back of weld, using saddle connection type,
Prime coat, filled layer and capping layer respectively should be using oblique arc-shaped, zigzag, anti-crescent arc manipulation methods and at welding process rifle angle
It is 80-90 ° that degree, which is maintained at welding direction angle, and the angle with pipe circumference is 30 ° or so, reasonable technological parameter and control
Heat input, temperature is at 150 DEG C hereinafter, reducing the residual of welding stress using hammering method between control layer road.
More than, it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, it is any
Those familiar with the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its invents
Design is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of tube sheet penetration type prosposition MAG welds one side welding with back formation technique, which comprises the steps of:
S1: the tube sheet penetration type groove weld structure of plate Q345B and pipe 35# steel are chosen；
S2: machining test specimen: test tube size are as follows: D60mm*200mm*14mm, test plate (panel) size are as follows: 160mm*160mm*14mm,
Plate processes Φ 65mm centre bore, and plate is by 50 ° of grooves of centre bore addition；It will be mechanical within the scope of groove and weld seam two sides 30-50mm
It is cleared up, removes water removal, oil and oxide on surface until metallic luster polishes plate centre bore groove to prevent plate side burn-through
1-1.5mm root face；
S3: group is to positioning: choosing corresponding shape-setting clamp, in three, groove back side location point uniform location, root gap is
3-4mm, and ensure that gap is uniform, saddle plate is removed again after prime coat is soldered；
S4: welding: the starting the arc out of groove, prime coat are certain when torch swinging to pipe side using tiltedly arc-shaped manipulation of electrode
Welding wire is extended into back hereinafter, allowing electric arc in base burning, filled layer uses zigzag arc manipulation, centered on Guan Yuan, two
Side slightly stops, it is ensured that pipe, the fusion of plate side are good；Capping layer uses anti-moon shape arc manipulation method；
S5: it after completion to be welded, is being detected.
2. a kind of tube sheet penetration type prosposition MAG according to claim 1 welds one side welding with back formation technique, feature exists
In the welding method is welding (MAG-135), and welding equipment model NBC-350 welds material
Material is ER50-6, and welding wire specification is φ 1.0, and protective gas is 80%Ar and 20%CO2.
3. a kind of tube sheet penetration type prosposition MAG according to claim 1 welds one side welding with back formation technique, feature exists
Use clockwise direction welding method when, welding, the work angle (welding direction) of welding gun and plate is 80 ° -90 °, welds angle root Ju
The angle of welding gun and pipe is maintained at 30 ° always by the circularity variation of pipe.
4. a kind of tube sheet penetration type prosposition MAG according to claim 1 welds one side welding with back formation technique, feature exists
In the inspection after welding, first progress appearance test, lossless RT are examined, then macroscopical metallographic test, then carry out hardness inspection again
It surveys.
5. a kind of tube sheet penetration type prosposition MAG according to claim 1 welds one side welding with back formation technique, feature exists
Before being Q345B and the welding of 35# steel in, the weld seam preheating condition when plate thickness 25mm or more or environment temperature are lower than 5 DEG C,
It should carry out 100-150 DEG C of preheating.
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Cited By (6)
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|---|---|---|---|---|
| CN111136370A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for beveled T-shaped joint |
| CN111136369A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for tube plate butt joint structure |
| CN111390416A (en) * | 2020-03-25 | 2020-07-10 | 广汽本田汽车有限公司 | Welding method for cutting edge of automobile die |
| CN113305468A (en) * | 2021-06-23 | 2021-08-27 | 中国石油化工股份有限公司 | Welding material, application thereof and welding method |
| CN113927194A (en) * | 2021-11-01 | 2022-01-14 | 无锡鼎邦换热设备股份有限公司 | Heat exchanger tube plate welding method and welding device |
| CN114160939A (en) * | 2021-11-23 | 2022-03-11 | 四川盐业地质钻井大队 | Strip conveying method for manual electric arc welding of pipeline |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111136370A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for beveled T-shaped joint |
| CN111136369A (en) * | 2020-01-02 | 2020-05-12 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for tube plate butt joint structure |
| CN111136369B (en) * | 2020-01-02 | 2021-11-12 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for tube plate butt joint structure |
| CN111136370B (en) * | 2020-01-02 | 2022-02-15 | 中车青岛四方机车车辆股份有限公司 | Welding method and welding system for beveled T-shaped joint |
| CN111390416A (en) * | 2020-03-25 | 2020-07-10 | 广汽本田汽车有限公司 | Welding method for cutting edge of automobile die |
| CN111390416B (en) * | 2020-03-25 | 2021-02-23 | 广汽本田汽车有限公司 | Welding method for cutting edge of automobile die |
| CN113305468A (en) * | 2021-06-23 | 2021-08-27 | 中国石油化工股份有限公司 | Welding material, application thereof and welding method |
| CN113927194A (en) * | 2021-11-01 | 2022-01-14 | 无锡鼎邦换热设备股份有限公司 | Heat exchanger tube plate welding method and welding device |
| CN114160939A (en) * | 2021-11-23 | 2022-03-11 | 四川盐业地质钻井大队 | Strip conveying method for manual electric arc welding of pipeline |
| CN114160939B (en) * | 2021-11-23 | 2023-03-14 | 四川盐业地质钻井大队 | Strip conveying method for manual electric arc welding of pipeline |
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