CN113751828A - Non-preheating welding process for high-strength steel wire - Google Patents
Non-preheating welding process for high-strength steel wire Download PDFInfo
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- CN113751828A CN113751828A CN202110103688.6A CN202110103688A CN113751828A CN 113751828 A CN113751828 A CN 113751828A CN 202110103688 A CN202110103688 A CN 202110103688A CN 113751828 A CN113751828 A CN 113751828A
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- 238000003466 welding Methods 0.000 title claims abstract description 189
- 238000000034 method Methods 0.000 title claims abstract description 44
- 230000008569 process Effects 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 25
- 239000010959 steel Substances 0.000 title claims abstract description 25
- 238000010891 electric arc Methods 0.000 claims abstract description 20
- 238000006356 dehydrogenation reaction Methods 0.000 claims abstract description 9
- 230000007547 defect Effects 0.000 claims abstract description 8
- 239000010425 asbestos Substances 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000001035 drying Methods 0.000 claims abstract description 5
- 239000004744 fabric Substances 0.000 claims abstract description 5
- 238000004321 preservation Methods 0.000 claims abstract description 5
- 229910052895 riebeckite Inorganic materials 0.000 claims abstract description 5
- 230000007704 transition Effects 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 18
- 229910052799 carbon Inorganic materials 0.000 claims description 18
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 12
- 230000004907 flux Effects 0.000 claims description 12
- 239000001257 hydrogen Substances 0.000 claims description 12
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 239000002893 slag Substances 0.000 claims description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 7
- 239000010410 layer Substances 0.000 claims description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 6
- 239000011324 bead Substances 0.000 claims description 5
- 230000009286 beneficial effect Effects 0.000 claims description 5
- 230000008030 elimination Effects 0.000 claims description 5
- 238000003379 elimination reaction Methods 0.000 claims description 5
- 239000011229 interlayer Substances 0.000 claims description 5
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000227 grinding Methods 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 4
- 238000007254 oxidation reaction Methods 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 3
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 239000002932 luster Substances 0.000 claims description 3
- 239000001301 oxygen Substances 0.000 claims description 3
- 229910052760 oxygen Inorganic materials 0.000 claims description 3
- 238000010791 quenching Methods 0.000 claims description 3
- 230000000171 quenching effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 238000010790 dilution Methods 0.000 abstract description 4
- 239000012895 dilution Substances 0.000 abstract description 4
- 238000002425 crystallisation Methods 0.000 abstract description 3
- 230000008025 crystallization Effects 0.000 abstract description 3
- 239000000155 melt Substances 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000005255 carburizing Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000035882 stress Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
Classifications
-
- 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
-
- 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
- B23K28/00—Welding or cutting not covered by any of the preceding groups, e.g. electrolytic welding
- B23K28/02—Combined welding or cutting procedures or apparatus
-
- 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
- B23K9/0026—Arc welding or cutting specially adapted for particular articles or work
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
Abstract
The invention discloses a non-preheating welding process of high-strength steel wires, which comprises the following steps: the method comprises the following steps: preparing an alkaline welding rod, strictly drying, putting the alkaline welding rod in a heat preservation box, and taking the alkaline welding rod at any time, wherein the second step is as follows: the first manual electric arc welding, step three: 2-3 welding on the front surface, so that the welding seam and the groove wall are in smooth transition, and the fourth step is: turning over, gouging back roots, cleaning one section to be free of defects, and then welding 4-6 times by uninterrupted manual welding, wherein the fifth step is that: uninterrupted narrow-gap submerged arc automatic welding, and after welding, the sixth step: and (5) after welding, immediately carrying out dehydrogenation treatment, and carrying out a seventh step: the asbestos cloth is wrapped and slowly cooled, a double-U-shaped groove is adopted, a trace straight edge is adopted, at the moment, the radius of a root fillet is generally 5-8mm, crystallization cracks are facilitated, the forming coefficient of a welding seam is greatly improved, the dilution rate of the welding seam is smaller than that of a V-shaped groove, the residual force after welding is small, cold cracks can be effectively prevented, and the double-U-shaped groove is adopted, so that welding can be carried out without preheating.
Description
Technical Field
The invention relates to the technical field of steel structure welding, in particular to a non-preheating welding process for high-strength steel wires.
Background
In summary, with the rapid development of power stations, petrochemical industries and atomic energy industries, the requirements for materials are also continuously increased, and equipment is required to stably work at high temperature and high pressure for a long time, so that various heat-resistant alloy steels are widely applied.
Heat-resistant alloy steels such as 10CrM, 910, 12Cr1MoV, 13CrMo44 and the like generally need to be preheated to 200 ℃ and 300 ℃ for welding, otherwise, welding cold cracks are easy to generate, and equipment damage can be caused. Welding preheating is beneficial to reducing the hardness of a welding seam and a heat affected zone, the diffusion and the escape of hydrogen are accelerated, and welding cold cracks can be effectively prevented; however, welding preheating has disadvantages, which increase the working hours of welders, consume more energy, and are harmful to the health of welders, even improper welding preheating can increase welding stress, resulting in thermal stress cracks, so that a new process method which can overcome the disadvantages of welding preheating and prevent welding cold cracks is urgently needed in production. In the process of manufacturing the first 30OMW boiler in 1971, a large number of welding cold cracks are found in dissimilar steel welding products of a reheater, and the repair loss is nearly millions of yuan. The analysis and treatment of the accident are inspired greatly, and whether a non-preheating welding process of the high-strength steel wire exists is a new problem worthy of research and discussion.
Disclosure of Invention
The invention aims to provide a non-preheating welding process of high-strength steel wires, which aims to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a non-preheating welding process of high-strength steel wires comprises the following steps:
the method comprises the following steps: preparing an alkaline welding rod, strictly drying the alkaline welding rod, putting the alkaline welding rod in a heat preservation box, and taking the alkaline welding rod at any time;
step two: carrying out first manual electric arc welding;
step three: 2-3 welding passes are performed on the front surface, so that the welding seam and the groove wall are in smooth transition;
step four: turning over, air gouging to remove roots, cleaning a section to be free of defects, and then continuously welding for 4-6 times by manual welding;
step five: uninterrupted narrow-gap submerged arc automatic welding is carried out, and the welding is finished;
step six: after welding, hydrogen is removed immediately;
step seven: wrapping with asbestos cloth, and slowly cooling.
Preferably, a matched welding rod is selected in the first step, and oil, dirt and the like on the surface are removed before the argon arc welding rod is used.
Preferably, in the second step, a double-U-shaped groove with a slight straight edge is formed before welding, and the root part has a fillet radius of 5-8 mm.
Preferably, in the fourth step, the groove is internally provided with rust, oil, scale and oxide skin which are removed until the metallic luster is exposed, and in order to prevent the oxidation of the root, it should be noted that in the carbon arc gouging process, the main function of the compressed air is to blow off the molten metal generated by the high-temperature heating of the carbon rod arc, and also to cool the carbon rod electrode, so that the burning loss of the carbon rod can be correspondingly reduced, but when the flow of the compressed air is too large, the temperature of the molten metal is reduced, and the processing of the metal to be cut is not facilitated.
Preferably, after carbon arc air gouging of the low carbon steel in the fourth step, a hardened layer is formed on the surface of the gouging groove, which is formed by quenching the high temperature metal by the compressed air and is not a result of carburization. Therefore, the welding of the low-carbon steel after the arc gouging can not influence the welding quality, when a high-power direct-current welding machine is used, a direct-current reverse connection method is needed to be adopted for gouging operation, namely a carbon rod is connected with an anode, a ground wire is connected with a cathode, and in the gouging process, the defects that air holes, slag inclusion and the like cannot exist in the welding line are observed.
Preferably, in the step five, the processes of igniting the electric arc, feeding the wire, moving the electric arc along the welding direction, ending the welding and the like during submerged arc welding are completely completed by a machine.
Preferably, in the step five submerged arc welding, the welding position of the workpiece is covered with a granular flux with the thickness of 30-50 mm, the continuously fed welding wire generates an electric arc between the lower part of the flux layer and the workpiece, the heat of the electric arc melts the welding wire, the workpiece and the flux to form a molten metal pool, the molten metal pool and the molten metal pool are isolated from air, the electric arc continuously melts the metal, the welding wire and the flux of the workpiece in front as the welding machine automatically moves forwards, the edge behind the molten pool starts to cool and solidify to form a welding line, and the liquid slag is subsequently condensed to form a hard slag shell.
Preferably, the post-welding dehydrogenation treatment in the sixth step refers to low-temperature heat treatment performed after the welding is completed and the welding seam is not cooled to be below 100 ℃, and the main function of the post-welding dehydrogenation treatment is to accelerate the escape of hydrogen in the welding seam and a heat affected zone.
Preferably, in the sixth step, the post-welding dehydrogenation treatment temperature is 200-350 ℃ by heating, and the temperature is kept for 2-6 hours.
Preferably, once oxidation color is found on the surface of the interlayer weld bead during welding, the interlayer weld bead is ground by an angular grinding wheel so as to ensure that the oxygen content of the weld joint is low.
Compared with the prior art, the invention has the beneficial effects that:
1. the non-preheating welding process of the high-strength steel wire adopts the double-U-shaped groove with the trace straight edges, and is beneficial to crystal cracks because of the existence of root fillet radius which is generally 5-8mm at the moment.
2. The non-preheating welding process of the high-strength steel wire adopts the technical measures of double U-shaped grooves, manual welding bottoming, hydrogen elimination after welding and the like, and can carry out non-preheating welding.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a technical scheme that: a non-preheating welding process of high-strength steel wires comprises the following steps:
the method comprises the following steps: preparing an alkaline welding rod, strictly drying the alkaline welding rod, putting the alkaline welding rod in a heat preservation box, and taking the alkaline welding rod at any time;
step two: carrying out first manual electric arc welding;
step three: 2-3 welding passes are performed on the front surface, so that the welding seam and the groove wall are in smooth transition;
step four: turning over, air gouging to remove roots, cleaning a section to be free of defects, and then continuously welding for 4-6 times by manual welding;
step five: uninterrupted narrow-gap submerged arc automatic welding is carried out, and the welding is finished;
step six: after welding, hydrogen is removed immediately;
step seven: wrapping with asbestos cloth, and slowly cooling.
Furthermore, in the first step, matched welding rods are selected, and oil, dirt and the like on the surface are removed before the argon arc welding rods are used.
Further, in the second step, a double U-shaped groove with a trace straight edge is formed before welding, the root part has a fillet radius of 5-8mm, the double U-shaped groove is adopted, the trace straight edge is formed, the fillet radius of the root part is generally 5-8mm at the moment, crystallization cracks are facilitated, the weld forming coefficient is greatly improved, the weld dilution rate is smaller than that of the V-shaped groove, the residual force after welding is smaller, cold cracks can be effectively prevented from being generated, the double U-shaped groove, manual welding backing, hydrogen elimination after welding and other technological measures can be adopted, non-preheating welding can be carried out, double U-shaped grooves with a trace straight edge are adopted, the fillet radius of the root part is generally 5-8mm at the moment, crystallization cracks are facilitated, and the weld forming coefficient is greatly improved, the weld dilution rate is smaller than that of the V-shaped groove, and the residual force after welding is smaller, so that cold cracks can be effectively prevented.
Furthermore, in the fourth step, the groove is internally removed with rust, oil, scale and oxide skin until the metallic luster is exposed, and in order to prevent the oxidation of the root, it should be noted that in the carbon arc gouging process, the main function of the compressed air is to blow off the molten metal generated by the high-temperature heating of the carbon rod arc, and also to cool the carbon rod electrode, so as to correspondingly reduce the burning loss of the carbon rod, but when the flow of the compressed air is too large, the temperature of the molten metal is reduced, and the metal to be cut is not easy to process.
Further, after the carbon arc air gouging of the low carbon steel in the fourth step, a hardened layer is generated on the surface of the gouging groove, which is formed by quenching the high temperature metal by the compressed air and is not the result of carburizing. Therefore, the welding of the low-carbon steel after the arc gouging can not influence the welding quality, when a high-power direct-current welding machine is used, a direct-current reverse connection method is needed to be adopted for gouging operation, namely a carbon rod is connected with an anode, a ground wire is connected with a cathode, and in the gouging process, the defects that air holes, slag inclusion and the like cannot exist in the welding line are observed.
Furthermore, in the fifth step, the processes of igniting the electric arc, feeding the wire, moving the electric arc along the welding direction, ending the welding and the like during submerged arc welding are completely completed by a machine.
Further, in the fifth step of submerged arc welding, the welded part of the workpiece is covered with a granular flux with the thickness of 30-50 mm, the continuously fed welding wire generates an electric arc between the lower part of the flux layer and the workpiece, the heat of the electric arc melts the welding wire, the workpiece and the flux to form a molten metal pool, the molten metal pool and the molten metal pool are isolated from air, the electric arc continuously melts the metal, the welding wire and the flux of the workpiece in front along with the automatic forward movement of the welding machine, the edge behind the molten pool starts to cool and solidify to form a welding line, and the liquid slag is subsequently condensed to form a hard slag shell.
Further, the post-welding dehydrogenation treatment in the sixth step refers to low-temperature heat treatment performed after welding is completed and the welding seam is not cooled to be below 100 ℃, and the main effect of the post-welding dehydrogenation treatment is to accelerate hydrogen escape from the welding seam and a heat affected zone.
Further, in the sixth step, the post-welding dehydrogenation treatment temperature is heated to 200-350 ℃, and the temperature is kept for 2-6 hours.
Furthermore, in the welding process, once the oxide color is found on the surface of the interlayer welding bead, angular grinding is adopted for grinding so as to ensure the lower oxygen content of the welding line. .
The working principle is as follows: the method comprises the following steps: preparing an alkaline welding rod, strictly drying the alkaline welding rod, putting the alkaline welding rod in a heat preservation box, taking the alkaline welding rod at any time, namely selecting a matched welding rod, removing oil and scale on the surface before the argon arc welding rod is used, and the like, wherein the second step is as follows: in the first manual electric arc welding, a double U-shaped groove with a trace straight edge is formed before welding, and the root part has a fillet radius of 5-8mm at the moment, and the third step is that: 2-3 welding on the front surface, so that the welding seam and the groove wall are in smooth transition, and the fourth step is: turning over, gouging back roots, cleaning one section to be free of defects, and then welding 4-6 times by uninterrupted manual welding, wherein the fifth step is that: uninterrupted narrow-gap submerged arc automatic welding, and after welding, the sixth step: and (5) after welding, immediately carrying out dehydrogenation treatment, and carrying out a seventh step: wrapping with asbestos cloth, and slowly cooling.
In conclusion, the non-preheating welding process of the high-strength steel wire adopts the double-U-shaped groove with a trace of straight edges, is beneficial to crystal cracks because of the root fillet radius which is generally 5-8mm, has a smaller dilution rate than the V-shaped groove because the forming coefficient of the welding seam is greatly improved, has smaller residual force after welding, can effectively prevent cold cracks, and can carry out non-preheating welding by adopting the technical measures of double-U-shaped groove, manual welding bottoming, hydrogen elimination after welding and the like.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A non-preheating welding process of high-strength steel wires is characterized by comprising the following steps:
the method comprises the following steps: preparing an alkaline welding rod, strictly drying the alkaline welding rod, putting the alkaline welding rod in a heat preservation box, and taking the alkaline welding rod at any time;
step two: carrying out first manual electric arc welding;
step three: 2-3 welding passes are performed on the front surface, so that the welding seam and the groove wall are in smooth transition;
step four: turning over, air gouging to remove roots, cleaning a section to be free of defects, and then continuously welding for 4-6 times by manual welding;
step five: uninterrupted narrow-gap submerged arc automatic welding is carried out, and the welding is finished;
step six: after welding, hydrogen is removed immediately;
step seven: wrapping with asbestos cloth, and slowly cooling.
2. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: and in the first step, matched welding rods are selected, and before the argon arc welding rods are used, oil, dirt and the like on the surface are removed.
3. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: and in the second step, a double U-shaped groove with a micro straight edge is formed before welding, and the root part has a fillet radius of 5-8 mm.
4. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: in the fourth step, the groove is internally removed with rust, oil, scale and oxide skin until the metallic luster is exposed, and in order to prevent the oxidation of the root, it should be noted that in the carbon arc gouging process, the main function of the compressed air is to blow off the molten metal generated by the high-temperature heating of the carbon rod arc, and also to cool the carbon rod electrode, so as to correspondingly reduce the burning loss of the carbon rod, but when the flow of the compressed air is too large (greater than 0.6 mpa), the temperature of the molten metal is reduced, which is not beneficial to the processing of the metal to be cut.
5. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: after the carbon arc air gouging of the low carbon steel in the fourth step, a hardened layer is generated on the surface of the gouging groove, which is formed by quenching high-temperature metal by compressed air and is not the result of carburization. Therefore, the welding of the low-carbon steel after the arc gouging can not influence the welding quality, when a high-power direct-current welding machine is used, a direct-current reverse connection method is needed to be adopted for gouging operation, namely a carbon rod is connected with an anode, a ground wire is connected with a cathode, and in the gouging process, the defects that air holes, slag inclusion and the like cannot exist in the welding line are observed.
6. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: and in the fifth step, the processes of igniting the electric arc, feeding the wire, moving the electric arc along the welding direction, ending the welding and the like during submerged arc welding are completely completed by machinery.
7. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: in the five submerged-arc welding steps, a layer of granular flux with the thickness of 30-50 mm is covered on a welding position of a workpiece, an electric arc is generated between the continuously fed welding wire and the workpiece under the flux layer, the welding wire, the workpiece and the flux are melted by the heat of the electric arc to form a metal molten pool, the metal molten pool and the metal molten pool are isolated from air, the metal, the welding wire and the flux of the workpiece in front are continuously melted by the electric arc along with the automatic forward movement of the welding machine, the edge behind the molten pool starts to be cooled and solidified to form a welding line, and liquid slag is then condensed to form a hard slag shell.
8. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: the post-welding hydrogen elimination treatment in the sixth step is heat treatment performed after welding is completed and the welding seam is not cooled to be below 100 ℃, and the post-welding hydrogen elimination treatment mainly has the effect of accelerating hydrogen escape in the welding seam and a heat affected zone.
9. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: in the sixth step, the post-welding dehydrogenation treatment temperature is heated to 200-350 ℃, and the temperature is kept for 2-6 hours.
10. The non-preheating welding process of high-strength steel wires according to claim 1, characterized in that: during the welding process, once the oxide color is found on the surface of the interlayer welding bead, the interlayer welding bead is ground by an angular grinding wheel so as to ensure that the welding seam has lower (0.5-0.8 mm) oxygen content.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110103688.6A CN113751828A (en) | 2021-01-26 | 2021-01-26 | Non-preheating welding process for high-strength steel wire |
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| CN202110103688.6A CN113751828A (en) | 2021-01-26 | 2021-01-26 | Non-preheating welding process for high-strength steel wire |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE7908893L (en) * | 1978-10-27 | 1980-04-28 | Kobe Steel Ltd | SVETSNINGSFORFARANDE |
| CN102756227A (en) * | 2012-07-24 | 2012-10-31 | 四川科新机电股份有限公司 | Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt |
| CN103801808A (en) * | 2014-03-06 | 2014-05-21 | 上海振华重工(集团)股份有限公司 | Narrow-gap melting polar reactive gas shielded arc welding technology |
| CN104384677A (en) * | 2014-11-05 | 2015-03-04 | 九冶建设有限公司 | Super-thick steel plate welding method |
| CN109454313A (en) * | 2018-03-28 | 2019-03-12 | 南京宝色股份公司 | A kind of big specification low-alloy steel tube sheet welding plate preparation process |
-
2021
- 2021-01-26 CN CN202110103688.6A patent/CN113751828A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE7908893L (en) * | 1978-10-27 | 1980-04-28 | Kobe Steel Ltd | SVETSNINGSFORFARANDE |
| CN102756227A (en) * | 2012-07-24 | 2012-10-31 | 四川科新机电股份有限公司 | Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt |
| CN103801808A (en) * | 2014-03-06 | 2014-05-21 | 上海振华重工(集团)股份有限公司 | Narrow-gap melting polar reactive gas shielded arc welding technology |
| CN104384677A (en) * | 2014-11-05 | 2015-03-04 | 九冶建设有限公司 | Super-thick steel plate welding method |
| CN109454313A (en) * | 2018-03-28 | 2019-03-12 | 南京宝色股份公司 | A kind of big specification low-alloy steel tube sheet welding plate preparation process |
Non-Patent Citations (2)
| Title |
|---|
| 徐在林，盛立宽: "厚板封头的不预热焊接", 《焊接技术》 * |
| 李义田: "浅谈低碳钢碳弧气刨", 《价值工程》 * |
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Application publication date: 20211207 |
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