CN105397241A - Welding method for spherical tanks of material 610U2L - Google Patents
Welding method for spherical tanks of material 610U2L Download PDFInfo
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- CN105397241A CN105397241A CN201510865990.XA CN201510865990A CN105397241A CN 105397241 A CN105397241 A CN 105397241A CN 201510865990 A CN201510865990 A CN 201510865990A CN 105397241 A CN105397241 A CN 105397241A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/02—Seam welding; Backing means; Inserts
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/235—Preliminary treatment
-
- 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
- B23K9/32—Accessories
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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a welding method for spherical tanks of the material 610U2L. The welding method comprises the steps of 1), carrying out groove treatment on the inner sides and the outer sides of the welding edges of spherical shell plates of the spherical tanks; 2), selecting the longitudinal seam welding method or the transverse seam welding method according to the distribution directions of welding seams; 3), selecting a welding electrode according to the selection standard of the welding electrode and drying the welding electrode; 4), carrying out welding according to the welding process and the selected welding method, wherein the welding process comprises the welding environment requirements, preheating before welding, interlayer temperature control and the hydrogen removal treatment after heating. According to the welding method, the spherical tanks of the material 610U2L can be welded, and the application prospect is good.
Description
Technical field
The present invention relates to a kind of welding method, especially a kind of welding method for 610U2L material spherical tank.
Background technology
Along with the development of petroleum chemical industry, chemical plant installations maximizes, and the spherical tank of splendid attire cryogenic media gets more and more.Suitable material is selected to be the basis ensureing spherical tank safety.The selection principle of Spherical Tank Shell Plates material to meet high strength, can ensure again mouldability, excellent welding performance, enough notch toughness values and serviceability reliably and with long-term well.
Recent year has introduced JFE-HITEN610U2L steel that a kind of Japan produces for the manufacture of the harsher spherical storage tank of applying working condition.This steel grade not only has excellent low-temperature flexibility, and good weldability, the mechanical property of welding point is higher.Within 2003, this steel grade first Application is in the 2500m raising sub-petrochemical industry-BASF Co., Ltd design temperature-48 DEG C
3propylene Spherical Tanks.The performance that this steel grade is good obtains the favor of each side, adopts this steel grade to make the high pressure low temperature spherical tank of the media such as splendid attire ethene, propylene in recent years more.
But, at present also not for the welding method of 610U2L material spherical tank, to solve the Welding Problems that 610U2L material runs in welding process.
Summary of the invention
The object of the invention is to: a kind of welding method for 610U2L material spherical tank is provided.
Technical scheme: the welding method for 610U2L material spherical tank of the present invention, comprises the steps:
Step 1, carries out groove process to outside in the welding edge of the Spherical Tank Shell Plates of spherical tank;
Step 2, according to distribution route selection longitudinal seam welding method or the transverse joint welding of weld seam;
Step 3, chooses welding rod according to welding rod choice criteria, and carries out drying and processing to welding rod;
Step 4, welds according to the welding of welding procedure and selection;
Wherein, described welding process requirement comprises:
A. welding surroundings requires: weather requires non-sleety weather; Wind speed requires lower than 5m/s; Environment temperature requires more than 0 DEG C; Relative humidity requires below 80%;
B. the control of weld preheating and interlayer temperature: weld preheating adopts electrical heating, preheating width is that Weld pipe mill both sides are each apart from 150mm, preheat temperature is >=125 DEG C, measure in Weld pipe mill bilateral symmetry with tempilstick, it is three right that every bar weld seam measuring point is no less than, the necessary preheating of every bar weld seam in welding process, to ensure that preheat temperature is even, interlayer temperature during welding should control at 180 ~ 200 DEG C;
C. after heat disappears hydrogen process: postwelding should carry out the hydrogen process that disappears, and adopt electrical heating, postheat temperature is 180 ~ 230 DEG C, temperature retention time 1 hour;
Requiring to include of described longitudinal seam welding method:
D. according to the welding of segmentation from top to bottom, when adopting several welder welding simultaneously, speed of welding is consistent, and the difference of same time weld length must not more than 300mm;
E. adopt triangle arc manipulation method, welding rod is stopped and short arc operation in weld seam both sides, determine corresponding welding parameter according to the welding number of plies;
F. the face of weld of every layer is filled and led up in crescent, and ground floor all adopts the welding rod of φ 3.2mm, welds ground floor by subinverse, from the second layer, successively thicken layer, and the weldering meat of every layer should within 3 ~ 4mm, fill and to want evenly and neat, last capping layer needs disposable completing, must not undercut;
G., after outside groove welding is shaped, in inner side, groove place carries out carbon arc air gouging back chipping, is fallen clearly by the weldering meat of ground floor, adopt grinding-wheel grinder except carburized layer, finishing channeling, bottom radius should be greater than 5mm, after groove face carry out 100% magnetic particle inspection, carry out inner side groove welding again after qualified;
Requiring to include of described transverse joint welding:
H. during seam welding, weld from two toward middle on butt-welding fitting, under butt-welding fitting during seam welding, welded from middle toward two, two welding machines weld a seam simultaneously;
I., when girth welding large to equator, several welder welding is simultaneously adopted, Equal round girth, counterclockwise constant speed welding, same time ground floor and second layer weld length must not differ more than 300mm, adopt backstep sequence, multi-pass welding in everyone segmentation limit;
J. backing welding adopts oval manipulation of electrode, and welding rod direction of advance and weld seam tangential direction are the inclination angle of 30 ~ 45 °;
K. more than the second layer adopt the weldering of pressure road, and every layer must thoroughly scarfing cinder.
Adopt the welding procedure of a, b and c tri-welding process requirement to spherical tank to limit, effectively can guarantee the welding quality of 610U2L material spherical tank, avoid welding to do over again, improve efficiency of construction; Adopt d, e, f and g tetra-welding requirements to limit longitudinal seam welding method, effectively improve the welding quality of longitudinal joint; Adopt the face of weld of every layer to fill and lead up in crescent, the welding of the more convenient lower one deck of scarfing cinder can be convenient to; Adopt and weld ground floor by subinverse, be conducive to interior back chipping, pore is fallen clearly; Adopt h, i, j and k tetra-welding requirements to limit transverse joint welding, can effectively improve transverse joint welding quality.
As further restriction scheme of the present invention, in the requirement of described longitudinal seam welding method and transverse joint welding, when adopting several welder simultaneously welding, welding point place should stitch with tee and stagger, and two welders collect junction should stagger 50 ~ 100mm.This design can prevent welding point from concentrating on same section, thus effectively improves the structural strength at welding point place.
As further restriction scheme of the present invention, step 1) in, groove processing requirements according to the angle of the thickness determination groove of global shell, and needs the objectionable impurities of cleaning within the scope of groove face and both sides 50mm.Remove objectionable impurities and can guarantee welding quality.
As further restriction scheme of the present invention, objectionable impurities comprises iron rust and greasy dirt.
As further restriction scheme of the present invention, step 3) in, welding rod choice criteria requires that in welding rod, diffusible hydrogen content is less than 5.0ml/100g.
As further restriction scheme of the present invention, step 3) in, drying and processing requires that temperature rises to 350 ~ 400 DEG C in 2 hours, and maintains this temperature 1 ~ 2 hour, require that when lowering the temperature temperature drops to 100 ~ 150 DEG C in 1 hour, and maintain this temperature at least 3 hours.Drying and processing effectively can improve the welding quality of welding rod when welding.
As further restriction scheme of the present invention, the corresponding relation of the welding number of plies and welding parameter is see table 1:
Table 1
Adopt the welding parameter that setting at different levels is different, effectively can strengthen the structural strength after welding.
The present invention compared with prior art, its beneficial effect is: (1) adopts the welding procedure of a, b and c tri-welding process requirement to spherical tank to limit, effectively can guarantee the welding quality of 610U2L material spherical tank, avoid welding to do over again, improve efficiency of construction; (2) adopt d, e, f and g tetra-welding requirements to limit longitudinal seam welding method, effectively improve the welding quality of longitudinal joint; (3) adopt the face of weld of every layer to fill and lead up in crescent, the welding of the more convenient lower one deck of scarfing cinder can be convenient to; (4) employing welds ground floor by subinverse, is conducive to interior back chipping, is fallen clearly by pore; (5) adopt h, i, j and k tetra-welding requirements to limit transverse joint welding, can effectively improve transverse joint welding quality.
Accompanying drawing explanation
Fig. 1 is method flow diagram of the present invention;
Fig. 2 is drying and processing temperature control curve figure of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, technical solution of the present invention is described in detail, but protection scope of the present invention is not limited to described embodiment.
Embodiment 1:
As shown in Figure 1, a kind of welding method for 610U2L material spherical tank provided by the invention, comprises the steps:
Step 1, carries out groove process to outside in the welding edge of the Spherical Tank Shell Plates of spherical tank;
Step 2, according to distribution route selection longitudinal seam welding method or the transverse joint welding of weld seam;
Step 3, chooses welding rod according to welding rod choice criteria, and carries out drying and processing to welding rod;
Step 4, welds according to the welding of welding procedure and selection;
Wherein, welding process requirement comprises:
A. welding surroundings requires: weather requires non-sleety weather; Wind speed requires lower than 5m/s; Environment temperature requires more than 0 DEG C; Relative humidity requires below 80%;
B. the control of weld preheating and interlayer temperature: weld preheating adopts electrical heating, preheating width is that Weld pipe mill both sides are each apart from 150mm, preheat temperature is >=125 DEG C, measure in Weld pipe mill bilateral symmetry with tempilstick, it is three right that every bar weld seam measuring point is no less than, the necessary preheating of every bar weld seam in welding process, to ensure that preheat temperature is even, interlayer temperature during welding should control at 180 ~ 200 DEG C;
C. after heat disappears hydrogen process: postwelding should carry out the hydrogen process that disappears, and adopt electrical heating, postheat temperature is 180 ~ 230 DEG C, temperature retention time 1 hour;
Requiring to include of longitudinal seam welding method:
D. according to the welding of segmentation from top to bottom, when adopting several welder welding simultaneously, speed of welding is consistent, and the difference of same time weld length must not more than 300mm;
E. adopt triangle arc manipulation method, welding rod is stopped and short arc operation in weld seam both sides, determine corresponding welding parameter according to the welding number of plies;
F. the face of weld of every layer is filled and led up in crescent, be convenient to the welding of the more convenient lower one deck of scarfing cinder, ground floor all adopts the welding rod of φ 3.2mm, welds ground floor by subinverse, is conducive to interior back chipping like this, pore is fallen clearly, from the second layer, successively thicken layer, and the weldering meat of every layer should within 3 ~ 4mm, fill and to want evenly and neat, last capping layer needs disposable completing, must not undercut;
G., after outside groove welding is shaped, in inner side, groove place carries out carbon arc air gouging back chipping, is fallen clearly by the weldering meat of ground floor, adopt grinding-wheel grinder except carburized layer, finishing channeling, bottom radius should be greater than 5mm, after groove face carry out 100% magnetic particle inspection, carry out inner side groove welding again after qualified;
Requiring to include of transverse joint welding:
H. on global shell during seam welding, from two toward middle weldering, under global shell during seam welding, from middle toward two weldering, two welding machines weld a seam simultaneously;
I., when girth welding large to equator, several welder welding is simultaneously adopted, Equal round girth, counterclockwise constant speed welding, same time ground floor and second layer weld length must not differ more than 300mm, adopt backstep sequence, multi-pass welding in everyone segmentation limit;
J. backing welding adopts oval manipulation of electrode, and welding rod direction of advance and weld seam tangential direction are the inclination angle of 30 ~ 45 °;
H. more than the second layer adopt the weldering of pressure road, and every layer must thoroughly scarfing cinder.
Wherein, in the requirement of described longitudinal seam welding method and transverse joint welding, when adopting several welder simultaneously welding, welding point place should stitch with tee and stagger, and two welders collect junction should stagger 50 ~ 100mm; In step 1) in, groove processing requirements according to the angle of the thickness determination groove of weldment, and needs the objectionable impurities of cleaning within the scope of groove face and both sides 50mm, and objectionable impurities is generally iron rust and greasy dirt; In step 3) in, welding rod choice criteria requires that in welding rod, diffusible hydrogen content is less than 5.0ml/100g; In step 3) in, drying and processing requires that temperature rises to 350 ~ 400 DEG C in 2 hours, and maintains this temperature 1 ~ 2 hour, requires that temperature drops to 100 ~ 150 DEG C in 1 hour, and maintains this temperature at least 3 hours, as shown in Figure 2 when lowering the temperature; The corresponding relation of the welding number of plies and welding parameter is see table 1:
Table 1
To when asking each Spherical Tank Shell Plates of tank body to weld, outside welding sequence is followed successively by: equatorial zone longitudinal joint is outer, upper pole side plate longitudinal joint outer, upper extremely in outer, the lower pole side plate longitudinal joint of plate piece outer, upper pole side plate moon teeth space outer, lower extremely in the outer and equatorial zone of plate piece outer, lower pole side plate moon teeth space up and down outside large circumferential weld.After outside has been welded, need to carry out inner side gouge back chipping, carried out inner side welding according to order above.
Points for attention during welding comprise:
(1) inconel weld forming a solder, if midway stop welding, then a minimum weldering of weld seam two-layer more than, upper once weld time need preheating after weld again;
(2) per pass weld seam all should be soldered to terminal from top continuously, and the action changing welding rod wants fast, must complete, no matter any cold junction all wants reconditioning welding again within 5 seconds;
(3) the weldering meat of longitudinal welding bead is soldered to the center of circumferential welded seam, grinds off before girth welding;
(4) forbid in the outer striking of groove, striking adopts reflow welding bead arc inciting process, i.e. side's 10 ~ 15mm place striking before welding, and then retract joint welding, arc crater fills up by top.
After welding completes, butt welded seam is needed to carry out back chipping and polishing, after large groove side has been welded, back chipping inside little groove.Carbon arc air gouging adopts the carbon-point of φ 8mm, electric welding machine straight polarity direct current method, the bevel shape width uniformity after back chipping, then to polish oxide layer with abrasive machine, till presenting metallic luster, the groove after polishing should carry out the magnetic particle inspection of 100%, welds as found that defect is eliminated immediately again.
When checking the weld seam after having welded, should be noted that:
A. must not there be crackle on surface, Seam and heat effected zone;
B. face of weld must not have the defects such as undercut, pore, slag inclusion, arc crater, must not have slag splash;
C. weld width should broadening 2 ± 1mm than the every limit of groove.
Following table 2 is met according to " 3000m3LPG spherical tank making and installation technical conditions " and weld seam postwelding physical dimension quality requirement:
Table 2
| Sequence number | Inspection item | Tolerance (mm) |
| 1 | Postwelding angular deformation | ≤5 |
| 2 | Maximum gauge and minimum diameter after sphere welding | ＜65 |
| 3 | Outer surface weld reinforcement | 0～1 |
| 5 | Inner surface weld reinforcement | 0～1 |
| 6 | Pillar verticality | ≤12 |
When repairing the blemish of the weld seam after having welded: use abrasive machine reconditioning, within the scope of reconditioning, gradient is at least 3:1, and after work card tool gouge, when the blemish degree of depth answers repair welding more than during 1.3mm, repair welding is identical with formal welding procedure; After repair welding, reconditioning is excessively round and smooth, is MT and checks after repairing.
Require when repairing the internal flaw of the weld seam after having welded:
A. before weld seam internal flaw is repaired, use ultrasound examination depth of defect, determine defect property, eliminate and the Defect of repair welding degree of depth, must not exceed 2/3 of spherical shell thickness of slab, carry out elimination defect, repair welding overleaf when exceeding, soldering length is greater than 50mm;
When b. adopting carbon arc air gouging to eliminate defect, with abrasive machine trimming after defect expressivity, grind off oxide layer repair welding again;
C. repair welding is identical with the formal welding procedure of spherical tank, carries out visual examination and Non-Destructive Testing after repair welding, and the number of times of repair welding and the technique of repair welding should carry out detailed record;
D. same position must not reprocess more than twice, as reliable and effective technological measure must be taked more than twice, and through unit person in charge of the technology aspect approval after can carry out.
After the inside and outside welding forming of spherical tank, detect through visual examination is qualified, test item comprises:
(1) Non-Destructive Testing
Non-Destructive Testing is carried out after qualified 36 hours through visual examination at postwelding.The butt weld (comprising the weld seam of manhole stiffener and manhole flange) of spherical shell, 100%TOFD should be adopted to detect, and carry out 20% ray repetition measurement, operative norm JB/T4730-2005 II grade is qualified;
(2) Magnetic testing
Magnetic testing before heat treatment, after heat treatment and carry out after the water pressure test.The surfaces externally and internally (comprising the places such as locating piece, jig, covering repairing) of spherical tank butt weld, the outer surface of stiffening ring or pillar angle welding, carries out the Magnetic testing of 100% fusion length, is qualified by JB/T4730-2005 I grade;
(3) detection of defect after repairing, mending
There is excessive defect in weld seam inside, repair welding after Defect removal, after visual examination is qualified, by former characterization processes examinations.
As mentioned above, although represented with reference to specific preferred embodiment and described the present invention, it shall not be construed as the restriction to the present invention self.Under the spirit and scope of the present invention prerequisite not departing from claims definition, various change can be made in the form and details to it.
Claims (7)
1. for a welding method for 610U2L material spherical tank, it is characterized in that, comprise the steps:
Step 1, carries out groove process to outside in the welding edge of the Spherical Tank Shell Plates of spherical tank;
Step 2, according to distribution route selection longitudinal seam welding method or the transverse joint welding of weld seam;
Step 3, chooses welding rod according to welding rod choice criteria, and carries out drying and processing to welding rod;
Step 4, welds according to the welding of welding procedure and selection;
Wherein, described welding process requirement comprises:
A. welding surroundings requires: weather requires non-sleety weather; Wind speed requires lower than 5m/s; Environment temperature requires more than 0 DEG C; Relative humidity requires below 80%;
B. the control of weld preheating and interlayer temperature: weld preheating adopts electrical heating, preheating width is that Weld pipe mill both sides are each apart from 150mm, preheat temperature is >=125 DEG C, measure in Weld pipe mill bilateral symmetry with tempilstick, it is three right that every bar weld seam measuring point is no less than, the necessary preheating of every bar weld seam in welding process, to ensure that preheat temperature is even, interlayer temperature during welding should control at 180 ~ 200 DEG C;
C. after heat disappears hydrogen process: postwelding should carry out the hydrogen process that disappears, and adopt electrical heating, postheat temperature is 180 ~ 230 DEG C, temperature retention time 1 hour;
Requiring to include of described longitudinal seam welding method:
D. according to the welding of segmentation from top to bottom, when adopting several welder welding simultaneously, speed of welding is consistent, and the difference of same time weld length must not more than 300mm;
E. adopt triangle arc manipulation method, welding rod is stopped and short arc operation in weld seam both sides, determine corresponding welding parameter according to the welding number of plies;
F. the face of weld of every layer is filled and led up in crescent, and ground floor all adopts the welding rod of φ 3.2mm, welds ground floor by subinverse, from the second layer, successively thicken layer, and the weldering meat of every layer should within 3 ~ 4mm, fill and to want evenly and neat, last capping layer needs disposable completing, must not undercut;
G., after outside groove welding is shaped, in inner side, groove place carries out carbon arc air gouging back chipping, is fallen clearly by the weldering meat of ground floor, adopt grinding-wheel grinder except carburized layer, finishing channeling, bottom radius should be greater than 5mm, after groove face carry out 100% magnetic particle inspection, carry out inner side groove welding again after qualified;
Requiring to include of described transverse joint welding:
H. in Spherical Tank Shell Plates during seam welding, from two toward middle weldering, under Spherical Tank Shell Plates during seam welding, from middle toward two weldering, two welding machines weld a seam simultaneously;
I., when girth welding large to equator, several welder welding is simultaneously adopted, Equal round girth, counterclockwise constant speed welding, same time ground floor and second layer weld length must not differ more than 300mm, adopt backstep sequence, multi-pass welding in everyone segmentation limit;
J. backing welding adopts oval manipulation of electrode, and welding rod direction of advance and weld seam tangential direction are the inclination angle of 30 ~ 45 °;
K. more than the second layer adopt the weldering of pressure road, and every layer must thoroughly scarfing cinder.
2. the welding method for 610U2L material spherical tank according to claim 1, it is characterized in that, in the requirement of described longitudinal seam welding method and transverse joint welding, when adopting several welder welding simultaneously, welding point place should stitch with tee and stagger, and two welders collect junction should stagger 50 ~ 100mm.
3. the welding method for 610U2L material spherical tank according to claim 1 and 2, it is characterized in that, step 1) in, groove processing requirements according to the angle of the thickness determination groove of Spherical Tank Shell Plates, and needs the objectionable impurities of cleaning within the scope of groove face and both sides 50mm.
4. the welding method for 610U2L material spherical tank according to claim 3, is characterized in that, objectionable impurities comprises iron rust and greasy dirt.
5. the welding method for 610U2L material spherical tank according to claim 1 and 2, is characterized in that, step 3) in, welding rod choice criteria requires that in welding rod, diffusible hydrogen content is less than 5.0ml/100g.
6. the welding method for 610U2L material spherical tank according to claim 1 and 2, it is characterized in that, step 3) in, drying and processing requires that temperature rises to 350 ~ 400 DEG C in 2 hours, and maintain this temperature 1 ~ 2 hour, require that when lowering the temperature temperature drops to 100 ~ 150 DEG C in 1 hour, and maintain this temperature at least 3 hours.
7. the welding method for 610U2L material spherical tank according to claim 1 and 2, is characterized in that, the corresponding relation of the welding number of plies and welding parameter is see table 1:
Table 1
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| CN106425052A (en) * | 2016-10-31 | 2017-02-22 | 北京石油化工学院 | Method for achieving electric-arc welding all-position one-side welding with back formation |
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| CN109623106A (en) * | 2018-12-26 | 2019-04-16 | 常州市乐萌压力容器有限公司 | The welding procedure of semiconductor monocrystal furnace cavity |
| CN111112877A (en) * | 2019-12-25 | 2020-05-08 | 湖北理工学院 | Welding process of 07MnNiMoDR steel spherical tank at-50 DEG C |
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| CN106312354A (en) * | 2016-10-21 | 2017-01-11 | 中国化学工程第六建设有限公司 | Welding method for TP347H austenite stainless steel thin-wall pipe |
| CN106312354B (en) * | 2016-10-21 | 2018-06-05 | 中国化学工程第六建设有限公司 | The welding method of TP347H austenitic stainless steel thick-walled pipes |
| CN106425052A (en) * | 2016-10-31 | 2017-02-22 | 北京石油化工学院 | Method for achieving electric-arc welding all-position one-side welding with back formation |
| CN106695150A (en) * | 2017-01-25 | 2017-05-24 | 江苏岭南发酵设备有限公司 | Welding method used for large-size fermentation tank |
| CN109623106A (en) * | 2018-12-26 | 2019-04-16 | 常州市乐萌压力容器有限公司 | The welding procedure of semiconductor monocrystal furnace cavity |
| CN109623106B (en) * | 2018-12-26 | 2020-10-20 | 常州市乐萌压力容器有限公司 | Welding process of semiconductor single crystal furnace cavity |
| CN111112877A (en) * | 2019-12-25 | 2020-05-08 | 湖北理工学院 | Welding process of 07MnNiMoDR steel spherical tank at-50 DEG C |
| CN112122884A (en) * | 2020-08-25 | 2020-12-25 | 上海宝冶冶金工程有限公司 | Construction method of duplex stainless steel non-standard tank body |
| CN113634854A (en) * | 2021-08-25 | 2021-11-12 | 台州市五洲船业有限公司 | Welding process for storage tank of full-pressure liquefied gas transport ship |
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