CN101704162B - Electroslag welding method for cylindrical longitudinal seam V groove - Google Patents
Electroslag welding method for cylindrical longitudinal seam V groove Download PDFInfo
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- CN101704162B CN101704162B CN2009103111575A CN200910311157A CN101704162B CN 101704162 B CN101704162 B CN 101704162B CN 2009103111575 A CN2009103111575 A CN 2009103111575A CN 200910311157 A CN200910311157 A CN 200910311157A CN 101704162 B CN101704162 B CN 101704162B
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Abstract
The invention discloses an electroslag welding method for a cylindrical longitudinal seam V groove, which is implemented by the following steps: gas-cutting a butted part of workpieces into a single groove, curling a workpiece into a cylindrical shape, making the single groove combined into a double V groove, and priming the bottom of the V groove to form a priming weld seam; and erecting the cylindrical workpiece on an electroslag welding fixed beam, attaching cooling copper sliding blocks to the excircle of a cylinder body on the outside of an opening of the double V groove, electrifying a filament to smelt a welding stick and metal on the V surface of the groove of the workpiece to form a weld pool, continuously sending filaments into the weld pool, introducing cooling water to the cooling copper sliding blocks outside the weld pool, spraying water to the inner wall of the priming weld seam, in the welding process, making the cooling copper sliding blocks synchronously raised along with a welding head, and making electroslag weld seam reliably welded with the double V groove and the priming weld seam to complete the welding. The method has the advantages of high welding quality and high welding efficiency.
Description
Technical field
The invention belongs to machinery manufacturing technology field, be specifically related to a kind of electroslag welding method of cylindrical longitudinal seam V groove.
Background technology
For hollow cylindrical workpiece such as big rope sheave in the middle of the milling train kink and downcoiler top pinch rolls, all between 50mm-70mm, existing solder technology generally adopts steel plate curved earlier to thickness, adopts Lincoln weld to weld then.The track of Lincoln weld is a straight line, in order to guarantee welding quality, the uniformity coefficient that just requires groove is than higher, the angle uniformity of groove is relatively good, the groove fusion face need be polished and be exposed metallic luster, the processing of groove has only and adopts mach mode to meet the demands fully, requires the operator should adjust the position of ignition tip simultaneously, to guarantee the fusion character of weld seam in good time; In addition, the welding interval of Lincoln weld is long, and efficient is low, and production efficiency is low.
On the other hand, electroslag welding method is less demanding to fusion face, but electroslag welding generally is applied in the dull and stereotyped splicing, and its groove is the II type, the two sides of II type groove adopts the cooling copper shoe of water flowing to force appearance of weld, the welding efficiency height, weld defect is few, and flaw detection is once passed through basically, but for the cylindrical shape groove, because two solders side are cooled off the size restrictions of copper shoe contact-making surface, can't solve the difficult problem of clamping, therefore can't effectively weld.
Summary of the invention
The electroslag welding method that the purpose of this invention is to provide a kind of cylindrical longitudinal seam V groove, it is tight to have solved the requirement of available technology adopting Lincoln weld bevel for welding, and time is long, and welder's technical ability requires high, and welding interval is long; And the employing electroslag welding method is difficult to clamping for the cylindrical shape groove, the difficult problem that can't implement to weld.
The technical solution adopted in the present invention is, a kind of electroslag welding method of cylindrical longitudinal seam V groove is implemented according to following steps,
At first, be single groove with the joint gas cutting of workpiece, workpiece is curved to drum, and single groove is combined into bilateral double V-groove, and the bottom of double V-groove is felt secure with argon-rich gas shielded weldering, forms backing weld seam;
Then, the workpiece of drum uprightly is fixed on the electroslag welding built-in beam, open outer side at bilateral double V-groove touch the stack shell cylindrical with the cooling copper shoe, at bilateral double V-groove, form a space between backing weld seam and the cooling copper shoe, metal molten with welding wire and V-type surface, workpiece grooves place after the filament energising forms the molten bath in this space, constantly send filament to molten bath by welding machine, the molten bath upper surface is coated with slag bath, cooling copper shoe to the outside, molten bath feeds cooling water, spray water to the backing weld seam inwall simultaneously, force the molten bath rapid condensation to form the electroslag weld seam, the cooling copper shoe keeps rising synchronously with welding head in the welding process, thereby the electroslag weld seam is realized reliable welding with bilateral double V-groove and backing weld seam, finishes the groove welding of drum workpiece.
Electroslag welding method of the present invention, its feature also be,
The single groove root face height of bilateral double V-groove is 2-3mm.
The bevel angle of bilateral double V-groove is 40 °-60 °.
The backing weld seam degree of depth of bilateral double V-groove is 10-20mm.
According to circumstances, polished in the bad place of fusion, internal circular surfaces backing weld seam surface of drum workpiece after welding is finished, carry out the toolability welding with argon-rich gas shielded weldering again and get final product.
Method of the present invention is utilized the electroslag welding remelting, has reduced the machining before the weldering, has reduced the defective that exists in the bottoming welding, accelerated the cooling velocity of weld metal zone, welding quality is good, the welding efficiency height, save manufacturing cost, improved operating efficiency, improved the utilization rate in place.
Description of drawings
Fig. 1 is workpiece grooves and the slide block connection diagram in the electroslag welding method of the present invention;
Fig. 2 is the local enlarged diagram of the groove among Fig. 1;
Fig. 3 is that the inventive method is the operation principle schematic diagram of section with the A-A cutaway view among Fig. 1.
Among the figure, 1. workpiece, 2. backing weld seam, 3. electroslag weld seam, 4. cooling copper shoe, 5. molten bath, 6. slag bath, 7. filament.
The specific embodiment
The present invention is described in detail below in conjunction with the drawings and specific embodiments.
The present invention is directed to the handling characteristics of existing Lincoln weld and electroslag welding method; brought into play the advantage of two kinds of welding methods; with cylindrical longitudinal seam is original add backing plate Lincoln weld and change gas shielded arc welding bottoming welding into after, as fixing slide block, weld with the method for electroslag welding again.
As shown in Figure 1, be workpiece 1 groove and cooling copper shoe 4 connection diagrams in the electroslag welding method of the present invention, Fig. 2 is the local enlarged diagram of the groove among Fig. 1, the joint of workpiece 1 is made as single groove, single groove root face height H is 2-3mm, through after curved, two single grooves are combined as bilateral double V-groove, angle a is 40 °-60 °, the inner segment of groove is a backing weld seam 2, the degree of depth L of backing weld seam 2 is 10-20mm, and outer section of groove is the position of electroslag weld seam 3, is coated with cooling copper shoe 4 on the cylindrical of electroslag weld seam 3.
Electroslag welding method of the present invention is implemented according to following steps,
At first; with the joint gas cutting of workpiece 1 is single groove; single groove root face height H is 2-3mm; workpiece 1 is curved to drum, make single groove be combined into bilateral double V-groove, bevel angle a is 40-60 °; the bottom of double V-groove is felt secure with argon-rich gas shielded weldering; form backing weld seam 2, backing weld seam 2 degree of depth L are 10-20mm
Then, with reference to Fig. 3, the workpiece 1 of drum uprightly is fixed on the electroslag welding built-in beam, open outer side at bilateral double V-groove touch the stack shell cylindrical with cooling copper shoe 4, at bilateral double V-groove, form a space between backing weld seam 2 and the cooling copper shoe 4, metal molten with welding wire and V-type surface, workpiece grooves place after filament 7 energisings forms molten bath 5 in this space, constantly send filament 7 to molten bath 5 by welding machine, molten bath 5 upper surfaces are coated with slag bath 6, cooling copper shoe 4 to 5 outsides, molten bath feeds cooling water, spray water to backing weld seam 2 inwalls simultaneously, force molten bath 5 rapid condensation to form electroslag weld seam 3, prevent that the molten bath from puncturing the leakage slag, the cooling copper shoe keeps rising synchronously with welding head in the welding process, thereby electroslag weld seam 3 is realized reliable welding with bilateral double V-groove and backing weld seam 2, finishes the groove welding of drum workpiece 1.
According to circumstances, polished in the bad place of fusion, internal circular surfaces backing weld seam 2 surface of drum workpiece 1 after having welded, carry out the toolability welding with argon-rich gas shielded weldering again and get final product.
Fig. 3 is in the inventive method; with the A-A cutaway view among Fig. 1 is the operation principle schematic diagram of section; after filament 7 energising with the metal molten on welding wire and V-type surface, workpiece grooves place; form molten bath 5; the slag bath 6 of molten bath 5 upper surfaces can protect the molten steel in molten bath 5 not oxidized, and under the effect of cooling copper shoe 4 and inwall water spray, molten bath 5 rapid condensation form electroslag weld seam 3; realize reliable welding with bilateral double V-groove and backing weld seam 2, finish the welding of weld seam.
The cooling copper shoe rises with welding head in welding process, place, inboard with cool water shower molten bath 5, force molten bath 5 cooling formings, can be at the thin characteristics of steel plate, make the crystal grain in the weld seam can not form thick column crystal, the burning of heat affected area is also not serious, and postwelding is no longer heat-treated basically.
Embodiment
To thickness is that the cylindrical longitudinal seam of 50mm carries out electroslag welding, and concrete technological parameter is:
Wlding: H10Mn2, HJ431; Welding wire is not swung
Gage of wire: ￠ 3; Electrode extension: 70mm
Depth of slag bath: 50mm; Wire feed rate: 200m/h
Weldingvoltage: 38-40V; Welding current: 400A
Method of the present invention has broken through the technology prejudice that electroslag welding can only be welded II type groove, utilizes the electroslag welding remelting, reduce the defective that exists in the bottoming welding, adopted water-cooled behind during welding, accelerated the cooling velocity of weld metal zone, make the weld seam back not breakdown, simultaneously, limited growing up of crystal grain.Adopt the double V-groove electroslag welding to weld, welding quality is good, the welding efficiency height has reduced the machining before the weldering, has saved wlding and manpower, saved the workload of postwelding removal backing plate, reduce the processing charges of large-scale machining tool, the more important thing is, saved manufacturing cost, improve operating efficiency, improved the utilization rate in place.
Claims (1)
1. the electroslag welding method of a cylindrical longitudinal seam V groove is characterized in that, implements according to following steps:
At first, be single groove with the joint gas cutting of workpiece (1), workpiece (1) is curved to drum, and single groove is combined into bilateral double V-groove, and the bottom of double V-groove is felt secure with argon-rich gas shielded weldering, forms backing weld seam (2); The single groove root face height of described bilateral double V-groove is 2-3mm, and the bevel angle of bilateral double V-groove is 40 °-60 °, and the backing weld seam of bilateral double V-groove (2) degree of depth is 10-20mm;
Then, the workpiece (1) of drum uprightly is fixed on the electroslag welding built-in beam, open outer side at bilateral double V-groove touch the stack shell cylindrical with cooling copper shoe (4), at bilateral double V-groove, form a space between backing weld seam (2) and the cooling copper shoe (4), metal molten with welding wire and V-type surface, workpiece grooves place after filament (7) energising forms molten bath (5) in this space, constantly send filament (7) to molten bath (5) by welding machine, molten bath (5) upper surface is coated with slag bath (6), cooling copper shoe (4) to molten bath (5) outside feeds cooling water, spray water to backing weld seam (2) inwall simultaneously, force molten bath (5) rapid condensation to form electroslag weld seam (3), the cooling copper shoe keeps rising synchronously with welding head in the welding process, electroslag weld seam (3) thus realize reliably welding with bilateral double V-groove and backing weld seam (2);
Finish the groove welding of drum workpiece (1), after welding is finished, polished in the fusion place, internal circular surfaces backing weld seam (2) surface of drum workpiece (1), carry out toolability with argon-rich gas shielded weldering again and weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009103111575A CN101704162B (en) | 2009-12-10 | 2009-12-10 | Electroslag welding method for cylindrical longitudinal seam V groove |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009103111575A CN101704162B (en) | 2009-12-10 | 2009-12-10 | Electroslag welding method for cylindrical longitudinal seam V groove |
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| CN101704162A CN101704162A (en) | 2010-05-12 |
| CN101704162B true CN101704162B (en) | 2011-04-27 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102536891A (en) * | 2011-11-11 | 2012-07-04 | 贵州宜化化工有限责任公司 | Improved structure for draught fan vane wheel |
| CN102756242A (en) * | 2012-06-26 | 2012-10-31 | 江苏天成封头有限公司 | Method for welding carbon steel heads |
| CN103286528B (en) * | 2013-05-29 | 2015-04-22 | 东方电气集团东方锅炉股份有限公司 | Processing technology for longitudinal-seam narrow-gap welding groove of thick-walled barrels |
| CN107344263A (en) * | 2017-07-10 | 2017-11-14 | 中建钢构有限公司 | The welding method of bracket part plate and steel column part plate |
| CN113399853B (en) * | 2021-06-24 | 2023-01-06 | 杭萧钢构股份有限公司 | Welding method and welding gun |
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