CN102886593B - A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe - Google Patents
A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe Download PDFInfo
- Publication number
- CN102886593B CN102886593B CN201210395624.9A CN201210395624A CN102886593B CN 102886593 B CN102886593 B CN 102886593B CN 201210395624 A CN201210395624 A CN 201210395624A CN 102886593 B CN102886593 B CN 102886593B
- Authority
- CN
- China
- Prior art keywords
- welding
- steel
- steel pipe
- strength
- strength steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000003466 welding Methods 0.000 title claims abstract description 123
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 83
- 239000010959 steel Substances 0.000 title claims abstract description 83
- 230000005540 biological transmission Effects 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 230000004907 flux Effects 0.000 claims abstract description 9
- 229910000679 solder Inorganic materials 0.000 claims abstract description 9
- 239000000956 alloy Substances 0.000 claims abstract description 8
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 8
- 239000010425 asbestos Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 229910052895 riebeckite Inorganic materials 0.000 claims description 3
- 238000010583 slow cooling Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 11
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- 239000010410 layer Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- 239000011229 interlayer Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000035882 stress Effects 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
Landscapes
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe, adopt yield strength 460MPa level low alloy high strength steel plate, both sides are polished into single groove, and bend to the pre-profiling steel pipe with longitudinal joint, butt welded seam carries out prime coat welding, CO
2gas shielded arc welding welds, and adopts JM68 welding wire; Fill and capping employing Lincoln weld continuous sequence, select CHW-S9 submerged-arc welding wire, SJ101 solder flux.The problem that the present invention is directed in Q460 high-strength steel steel-pipe welding passes through CO
2gas shielded arc welding is selected to combine with JM68 welding wire, reasonably welding parameter, and CO
2gas shielded arc welding combines improve welding seam toughness and quality with CHW-S9 welding wire, SJ101 solder flux adopting automatic submerged arc welding, improves production efficiency simultaneously, is conducive to large-scale production.
Description
Technical field
The present invention relates to a kind of welding method of high-strength steel steel pipe.
Background technology
UHV transmission technology has overlength distance power transmission, vast capacity and low-loss feature, is to be able to fast-developing technology of transmission of electricity in recent years, builds the basic guarantee that extra-high voltage grid is also considered to the electricity needs of satisfied following sustainable growth.But, along with the raising of UHV transmission line conveying capacity and electric pressure, load and the tower weight of electric power pylon constantly increase, requirements at the higher level are proposed to the bearing capacity of electric power pylon, therefore the angle steel tower based on traditional low-alloy high-strength steel (yield strength≤345MPa) steel manufacture has been difficult to satisfy the demand, and needs development of new high-strength steel steel tower badly.To bear blast little owing to having for high-strength steel steel tube tower, the features such as cross section bending rigidity is large, simple for structure, compare with angle steel tower and have obvious technology and economic advantages, be particularly useful for the electric power pylon structure of bearing large load, have a good application prospect in UHV transmission steel tower field.In addition, along with the development of iron and steel manufacturing technology, the employing of various novel alloy and rolling mill practice facilitates Q460 grade high-strength steel manufactures field application at UHV transmission steel tower.Conventional strength grade of comparing steel, UHV transmission steel tower adopts Q460 high-strength steel not only can increase the load capacity of steel tower, and effectively can alleviate tower material weight 8-12%, saves overall cost 5%-8%.
Q460 high-strength steel steel pipe is the direct component parts of UHV transmission steel tube tower, and it can be divided into seamless steel pipe and longitudinal joint welded tube.To compare seamless steel pipe, adopt the method for longitudinal joint welded tube to manufacture steel pipe and there are more significantly economic advantages.Therefore for the Q460 steel pipe that UHV transmission steel tube tower uses in a large number, after rolling, longitudinal joint welded tube manufacture technics is adopted to be considered to the most economic, efficient manufacture method.
Q460 hardness of steel is higher, and containing micro alloying elements such as Nb, V, has certain cold cracking inclination.Consider from intensity angle, the intensity that weld metal need have same Q460 mother metal to match, but also should toughness be taken into account.In the selection of thermal weld stress, heat affected area also should be made to have the toughness meeting instructions for use, and the toughness as far as possible avoiding thermal stress strength to cause due to grain growth sharply declines.In addition, during Q460 steel-pipe welding, root quality control is the key factor of whole steel tube performance, and steel pipe, after rolling preformed, has higher constraint (restraint) degree, if selection of Welding is improper, easily cracks at root of weld stress raiser.Therefore only have and to be selected by rational welding material and the employing of welding procedure just can the excellent Q460 high-strength steel steel pipe of high efficiency processability.
Patent of invention " welding method of novel Q 460 steel for transmission tower " proposes and adopts stick electrode arc welding J607 welding rod and CO
2the mode of gas shielded arc welding JM60 welding wire welds novel Q 460 high-strength steel, but the method that this patent of invention proposes has the lower shortcoming of production efficiency, is difficult to the production being on a large scale applied to high-strength steel steel pipe.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art and the welding method that a kind of UHV transmission steel tube tower Q460 high-strength steel steel pipe is provided, by the selection of rational welding method and welding material, realize yield strength and reach 460MPa level steel pipe high-quality, efficient welding manufacture, both ensure that quality turn improved efficiency.
The technical scheme that the present invention takes is:
A welding method for UHV transmission steel tube tower Q460 high-strength steel steel pipe, comprises step as follows:
(1) adopt yield strength 460MPa level low alloy high strength steel plate, both sides are polished into that machining bevel angle is 25 °-35 °, root face is the single groove of 1mm-3mm, bend to the pre-profiling steel pipe with longitudinal joint, longitudinal joint gap 1mm-5mm;
(2) the not preheating before weldering as welding environment temperature >=0 ° C, when environment temperature is 40-50 ° of C lower than preheat temperature during 0 ° of C, interlayer temperature controls at 50-350 ° of C;
(3) butt welded seam carries out prime coat welding, CO
2gas shielded arc welding welds, and adopts JM68 welding wire, welding current 120A-300A; Weldingvoltage 18V-25V, speed of welding 0.002m/s-0.004m/s, weld heat input scope is 5KJ/cm-30KJ/cm;
(4) filling and capping adopt Lincoln weld continuous sequence, select CHW-S9 submerged-arc welding wire, SJ101 solder flux, welding current 450A-700A, weldingvoltage 26-35V, speed of welding 0.006m/s-0.01m/h, weld heat input 12-50KJ/cm;
(5), during ° C of environment temperature >=0, postwelding is without the need to heat-treating, and as environment temperature < 0 ° of C, postwelding adopts asbestos to cover welding point position, insulation slow cooling.
The welding method of described UHV transmission steel tube tower Q460 high-strength steel steel pipe, preferred steps is as follows:
(1) adopt yield strength 460MPa level low alloy high strength steel plate, both sides are polished into that machining bevel angle is 25 °, root face is the single groove of 1mm-3mm, bend to the pre-profiling steel pipe with longitudinal joint, longitudinal joint gap 3mm;
(2) being preheated to temperature is 50 ° of C;
(3) butt welded seam carries out prime coat welding, CO
2gas shielded arc welding welds, and adopts the JM68 welding wire of diameter 1.2mm, welding current 160A; Weldingvoltage 21V, speed of welding 0.002m/s, weld heat input scope is 16.8KJ/cm;
(4) filling and capping adopt Lincoln weld continuous sequence, select the CHW-S9 submerged-arc welding wire of diameter 3.2mm, SJ101 solder flux, welding current 600A, weldingvoltage 33V, speed of welding 0.006m/h, weld heat input 33KJ/cm;
(5), during ° C of environment temperature >=0, postwelding is without the need to heat-treating, and as environment temperature < 0 ° of C, postwelding adopts asbestos to cover welding point position, insulation slow cooling.
In the welding method of above-mentioned UHV transmission steel tube tower Q460 high-strength steel steel pipe, in step (2), during preheating, interlayer temperature controls at 50-350 ° of C.Prime coat welding 1-2 layer described in step (3).
The invention has the beneficial effects as follows:
(1) CO is used
2gas shielded arc welding, JM68 welding wire carries out backing welding, makes full use of CO
2gas shielded arc welding low hydrogen, the feature that arc energy density is high, reduces welding point cold cracking inclination and ensures root weld quality.The JM68 welding wire adopted, due to containing a small amount of grain refining element Ti, also can reach and improve welding seam toughness object.
(2) filling and capping adopt CHW-S9 welding wire, and SJ101 solder flux adopting automatic submerged arc welding, gives full play to submerged-arc welding deposition efficiency high, and the feature that speed of welding is fast is enhanced productivity.This patent can reach high-quality, efficient, low cost welding manufacture transmission line of electricity Q460 high-strength steel steel pipe object, to the Q460 high-strength steel steel pipe obtaining good mechanical performance, promotes that UHV transmission line development is significant.
(3) by the welding material selected by the present invention, welding method and welding parameter, property of welded joint can be made to reach Proper Match with Q460 steel.And in selected submerged welding process parameter area, heat input can't cause the excessive descent of thermal stress strength toughness, prepared joint to meet requirement to intensity and toughness under service condition.
The problem that the present invention is directed in Q460 high-strength steel steel-pipe welding passes through CO
2gas shielded arc welding is selected to combine with JM68 welding wire, reasonably welding parameter, and CO
2gas shielded arc welding combines improve welding seam toughness and quality with CHW-S9 welding wire, SJ101 solder flux adopting automatic submerged arc welding, improves production efficiency simultaneously, is conducive to large-scale production.
Accompanying drawing explanation
Fig. 1 bevel shape schematic diagram;
Fig. 2 bend specimen picture;
The product tensile sample picture that Fig. 3 embodiment 1 obtains;
Weld seam cross section in Fig. 4 comparative example;
Wherein, 1. bevel angle, 2. longitudinal joint gap, 3. root face.
Detailed description of the invention
Further illustrate below in conjunction with detailed description of the invention.
Embodiment 1
(1) select Nb microalloying controlled rolling Q460 low-alloy high-strength steel, steel plate thickness is 12mm.Machined bevel angle is 30 °, root face 2mm, groove gap 2mm.
(2) during welding, environment temperature is 20 °, and do not carry out weld preheating, interlayer temperature controls at 100-300 ° of C.
(3) backing welding adopts the JM68 welding wire of diameter 1.2mm, CO
2gas shielded arc welding continuous sequence, welding current is 160A, and voltage is 21V, speed of welding 0.002m/s, and weld heat input is 16.8KJ/cm, and backing welding welds 1 layer.
(4) select CHW-S9 welding wire for submerged-arc welding, SJ101 solder flux, Lincoln weld continuous sequence completes filling and cover welding, select diameter 3.2mm welding wire, welding current 600A, weldingvoltage 33V, speed of welding 0.006m/s, weld heat input is 33KJ/cm, and the welding number of plies is 1 layer.
(5) postwelding is not heat-treated.
Carry out Mechanics Performance Testing by preparing welding point to above-mentioned technique, preparing welding point tensile strength is 555MPa, and fracture position is mother metal and heat affected area place, as shown in Figure 2.180 ° of faces are curved and carry on the back the defects such as curved sample flawless and produce, as shown in Figure 3.Adopt 10mm × 10mm × 55mm sample to carry out impact ductility test and show that weld metal ballistic work is 61J, fusion area ballistic work is 143J, and heat affected area ballistic work is 250J.Integration test result shows that prepared welding point has good mechanical property.
Embodiment 2
(1) select Nb microalloying controlled rolling Q460 low-alloy high-strength steel, steel plate thickness is 12mm.Machined bevel angle is 30 °, root face 2mm, groove gap 2mm.
(2) during welding, environment temperature is 20 °, and do not carry out weld preheating, interlayer temperature controls at 100-300 ° of C.
(3) backing welding adopts the JM68 welding wire of diameter 1.2mm, CO
2gas shielded arc welding continuous sequence, welding current is 200A, and voltage is 25V, speed of welding 0.003m/s, and weld heat input is 16.7KJ/cm, and backing welding welds 1 layer.
(4) select CHW-S9 welding wire for submerged-arc welding, SJ101 solder flux, Lincoln weld continuous sequence completes filling and cover welding, select diameter 3.2mm welding wire, welding current 650A, weldingvoltage 34V, speed of welding 0.008m/s, weld heat input is 27.6KJ/cm, and the welding number of plies is 1 layer.
(5) postwelding is not heat-treated.
Comparative example: adopt CO
2when gas shielded arc welding JM68 welding wire welds same size steel pipe, under the prerequisite ensureing weldquality, need welding 3 layer of 5 road, welding efficiency is obviously lower, and comparative example seam cross-section as shown in Figure 4.
Claims (2)
1. a welding method for UHV transmission steel tube tower Q460 high-strength steel steel pipe, is characterized in that, comprise step as follows:
(1) adopt yield strength 460MPa level low alloy high strength steel plate, both sides are polished into that machining bevel angle is 25 °, root face is the single groove of 1mm-3mm, bend to the pre-profiling steel pipe with longitudinal joint, longitudinal joint gap 3mm;
(2) being preheated to temperature is 50 DEG C;
(3) butt welded seam carries out prime coat welding, CO
2gas shielded arc welding welds, and adopts the JM68 welding wire of diameter 1.2mm, welding current 160A; Weldingvoltage 21V, speed of welding 0.002m/s, weld heat input scope is 16.8KJ/cm;
(4) filling and capping adopt Lincoln weld continuous sequence, select the CHW-S9 submerged-arc welding wire of diameter 3.2mm, SJ101 solder flux, welding current 600A, weldingvoltage 33V, speed of welding 0.006m/s, weld heat input 33KJ/cm;
(5), during environment temperature >=0 DEG C, postwelding is without the need to heat-treating, and as environment temperature < 0 DEG C, postwelding adopts asbestos to cover welding point position, insulation slow cooling.
2. the welding method of a kind of UHV transmission steel tube tower Q460 high-strength steel steel pipe according to claim 1, is characterized in that, the prime coat welding 1-2 layer described in step (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210395624.9A CN102886593B (en) | 2012-10-17 | 2012-10-17 | A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210395624.9A CN102886593B (en) | 2012-10-17 | 2012-10-17 | A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102886593A CN102886593A (en) | 2013-01-23 |
| CN102886593B true CN102886593B (en) | 2015-10-28 |
Family
ID=47530380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210395624.9A Active CN102886593B (en) | 2012-10-17 | 2012-10-17 | A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102886593B (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103658937B (en) * | 2013-12-04 | 2015-12-02 | 马鞍山马钢设备安装工程有限公司 | A kind of welding method of making steel bale panoramic tables sheet material |
| CN104708170A (en) * | 2013-12-16 | 2015-06-17 | 江苏鸿光杆塔有限公司 | Q460C steel welding process |
| CN103920975B (en) * | 2014-04-17 | 2016-02-24 | 中冶建筑研究总院有限公司 | High performance structures steel Q460GJC welding technology of automatic submerged-arc welding for building |
| CN104057186B (en) * | 2014-05-30 | 2016-03-16 | 国家电网公司 | A kind of welding method of UHV transmission steel tube tower Q690 high-strength steel steel pipe |
| CN104209625A (en) * | 2014-09-16 | 2014-12-17 | 武汉一冶钢结构有限责任公司 | Q460 steel thick plate welding process |
| CN104801835A (en) * | 2015-02-26 | 2015-07-29 | 胜利油田龙玺石油工程服务有限责任公司 | Method for welding without back chipping for ice resisting and water resisting pipe joint |
| CN105364276A (en) * | 2015-10-31 | 2016-03-02 | 江苏振光电力设备制造有限公司 | Welding machining technology of high-strength-steel steel pipe tower |
| CN106077908B (en) * | 2016-06-27 | 2018-05-29 | 国网山东省电力公司淄博供电公司 | A kind of welding method of Centrifugal Casting Iron Pipe part |
| CN108747072B (en) * | 2018-05-21 | 2020-10-30 | 武汉钢铁有限公司 | Large-linear-energy submerged arc composite welding method for thick bridge steel plate with tensile strength of more than or equal to 810MPa |
| CN109226940A (en) * | 2018-11-15 | 2019-01-18 | 江苏振光电力设备制造有限公司 | A kind of welding method of Q460 high-strength steel |
| CN109514051B (en) * | 2018-12-20 | 2021-11-30 | 中冶西北工程技术有限公司 | Pipeline welding method |
| CN110076416A (en) * | 2019-06-03 | 2019-08-02 | 中铁宝桥集团有限公司 | A kind of combined welding method of the bridge 08Ni3DR of resistance to sea atmosphere corrosion steel |
| CN112705867A (en) * | 2019-10-24 | 2021-04-27 | 青岛九合重工机械有限公司 | Method for welding T-shaped joint of pump truck |
| CN112453659B (en) * | 2020-10-09 | 2022-07-26 | 江阴兴澄特种钢铁有限公司 | Welding method for improving tensile stress resistance of welding joint |
| CN112388123A (en) * | 2020-11-06 | 2021-02-23 | 广州黄船海洋工程有限公司 | Machine head swinging device of submerged arc welding machine and swinging submerged arc welding method thereof |
| CN113369734A (en) * | 2021-06-03 | 2021-09-10 | 中煤北京煤矿机械有限责任公司 | Method for welding seamless steel pipe with high hardenability, high toughness and high strength |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107776A (en) * | 1982-12-14 | 1984-06-22 | Nippon Arm Kogyo Kk | Clamping method of groove part in welding metallic pipe |
| JPS6072667A (en) * | 1983-09-27 | 1985-04-24 | Kawasaki Steel Corp | Welding method of thick walled steel pipe for bending roll with high efficiency |
| CN101664771A (en) * | 2009-09-02 | 2010-03-10 | 惠生（南通）重工有限公司 | Abutting hidden arc welding method of pipe |
| CN101700600A (en) * | 2009-11-19 | 2010-05-05 | 河南第一火电建设公司 | Welding process method of novel Q460 steel for transmission tower |
| CN101885011A (en) * | 2010-07-16 | 2010-11-17 | 潍坊长安铁塔股份有限公司 | Making process of high strength steel straight seam steel tube |
| CN201841344U (en) * | 2010-11-13 | 2011-05-25 | 锦州义兴铁塔股份有限公司 | Gas shield protection arc and submerged arc integral automatic welding machine |
| CN102101210A (en) * | 2011-02-25 | 2011-06-22 | 首钢总公司 | Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station |
| CN102500892A (en) * | 2010-11-17 | 2012-06-20 | 天津电力建设公司 | Micro-alloying TMCP (Thermal Mechanical Control Processing) Q460 steel FCAW (Flux Cored Arc Welding) welding method |
-
2012
- 2012-10-17 CN CN201210395624.9A patent/CN102886593B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59107776A (en) * | 1982-12-14 | 1984-06-22 | Nippon Arm Kogyo Kk | Clamping method of groove part in welding metallic pipe |
| JPS6072667A (en) * | 1983-09-27 | 1985-04-24 | Kawasaki Steel Corp | Welding method of thick walled steel pipe for bending roll with high efficiency |
| CN101664771A (en) * | 2009-09-02 | 2010-03-10 | 惠生（南通）重工有限公司 | Abutting hidden arc welding method of pipe |
| CN101700600A (en) * | 2009-11-19 | 2010-05-05 | 河南第一火电建设公司 | Welding process method of novel Q460 steel for transmission tower |
| CN101885011A (en) * | 2010-07-16 | 2010-11-17 | 潍坊长安铁塔股份有限公司 | Making process of high strength steel straight seam steel tube |
| CN201841344U (en) * | 2010-11-13 | 2011-05-25 | 锦州义兴铁塔股份有限公司 | Gas shield protection arc and submerged arc integral automatic welding machine |
| CN102500892A (en) * | 2010-11-17 | 2012-06-20 | 天津电力建设公司 | Micro-alloying TMCP (Thermal Mechanical Control Processing) Q460 steel FCAW (Flux Cored Arc Welding) welding method |
| CN102101210A (en) * | 2011-02-25 | 2011-06-22 | 首钢总公司 | Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102886593A (en) | 2013-01-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102886593B (en) | A kind of welding method of UHV transmission steel tube tower Q460 high-strength steel steel pipe | |
| CN101337301B (en) | Submerged arc welding method of bridge steel of different intensity scale | |
| CN102962543B (en) | Welding process for red copper and stainless steel dissimilar materials | |
| CN103433603B (en) | The grade of P690QL1 high strength steel mates buried arc welding method by force | |
| CN102049599B (en) | Submerged-arc welding method for ultrahigh-strength steel plate F460Z for ocean structure | |
| CN100389924C (en) | P91 steel welding method | |
| CN102465290B (en) | Manufacturing method of double-layer metal composite pipe | |
| CN102101210A (en) | Welding method of high-strength steel for pressure steel pipe of 610MPa hydropower station | |
| CN105382378A (en) | Surfacing welding method for abraded large roll shaft | |
| CN103464865A (en) | Equal-intensity matching welding rod manual welding method for P690QL1 high-intensity steel | |
| CN104625342B (en) | A kind of yield strength is the weld joint welding process at 500MPa grades of high performance bridge steel angles | |
| CN110076430B (en) | Gas shielded welding method for 1000MPa steel plate with thickness of more than or equal to 40mm | |
| CN103464876A (en) | Submerged-arc welding method for P690QL1 and Q370R dissimilar steel | |
| CN111283308B (en) | All-position shielded metal arc welding process for ultralow-temperature 304LN austenitic stainless steel medium plate | |
| CN110576273A (en) | Metal material, process and product for welding LNG (liquefied natural gas) ultralow-temperature stainless steel | |
| CN103350272B (en) | A kind of welding procedure of T91 and 12Cr1MoV dissimilar steel | |
| CN103182591B (en) | Welding process for ultra-thick high-strength quenched and tempered S500Q steel plates for hydraulic turbine | |
| CN107020440A (en) | A kind of preparation method with human weld's crack defect test plate (panel) | |
| CN104511700A (en) | Nickel base alloy welding wire and preparation method thereof | |
| CN104070271B (en) | 15Cr1Mo1V valve body and WB36 pipe arrangement different steel weld method | |
| CN106964872B (en) | A kind of manual electric arc welding SMAW deep hole overlaying method | |
| CN106077908B (en) | A kind of welding method of Centrifugal Casting Iron Pipe part | |
| CN106270966A (en) | A kind of process welding low-temperature spheroidal iron and manganese steel plate | |
| CN102554507A (en) | Solid welding wire for generating residual compression stress and application of solid welding wire to stainless steel welding | |
| CN105195866A (en) | Full-automatic root welding method for pipe end of bimetal composite pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |