CN102744505A - Automatic five-wire submerged arc welding method for thick-wall welded pipes - Google Patents
Automatic five-wire submerged arc welding method for thick-wall welded pipes Download PDFInfo
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- CN102744505A CN102744505A CN2012102471607A CN201210247160A CN102744505A CN 102744505 A CN102744505 A CN 102744505A CN 2012102471607 A CN2012102471607 A CN 2012102471607A CN 201210247160 A CN201210247160 A CN 201210247160A CN 102744505 A CN102744505 A CN 102744505A
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Abstract
The invention discloses an automatic five-wire submerged arc welding method for thick-wall welded pipes. The automatic five-wire submerged arc welding method uses five welding wires. The welding inclination angles of the five welding wires along the travelling directions of the welded pipes are arranged from forward inclination to backward inclination sequentially. Therefore, the root of a welding pass of a weldment can be welded thoroughly, welding forming is achieved at one time, excess welding defects can be avoided, productivity is high, heat affected zone is small, and welding metal structure is uniform. The automatic five-wire submerged arc welding method for the thick-wall welded pipes can be widely applied to mass longitudinally submerged arc welding of steel pipes.
Description
Technical field
The present invention relates to a kind of welding method, relate to five automatic submerged-arc welding methods of a kind of heavy wall welded tube specifically.
Background technology
At present, metal solder method commonly used mainly contains melting welding, pressure welding, soldering etc., and wherein the most widely used welding manner has consumption of electrode formula and electrode loss-free type in manufacturing industry such as structural member.Consumption of electrode formula welding method is divided into gas shielded arc welding, gas welding, submerged-arc welding etc. again, and existing submerged-arc welding is to pile up solder flux above the weldment earlier, imbeds the welding wire of continuous supply then; Weld after the striking; Welding slag is given birth in not stopping pregnancy, and this moment, electric arc was buried by solder flux, cannot see from the outside; Solder flux shields; It is the method that a kind of electric arc burns and welds under welding flux layer, and it has welding quality stable, welding productivity height, no arc light and flue dust and seldom waits advantage, makes it become the main welding method in the important structure steel fabrications such as pressure vessel, pipeline section manufacturing, box beam column.
The petroleum gas long-distance transport pipes develop to the high grade of steel direction of heavy caliber thick wall at present.After the steel pipe moulding, through prewelding, interior weldering, outside weld three road welding sequence weldering systems.Welding wire is thick, electric current big because of using in submerged-arc welding, molten hole is dark, so during the interior outside weld welding of thick walled steel tube, all adopts five submerged welding processes, has improved the quality and the production efficiency of thick-walled pipe.But existing five submerged welding processes exist the bigger problem of heat input, welding point poor stability when thick-walled pipe is welded.
Summary of the invention
The present invention has overcome shortcoming of the prior art, provides a kind of heavy wall welded tube five automatic submerged-arc welding methods, its welding point good stability, and the pattern of weld seam and quality are all better.
In order to solve the problems of the technologies described above, the present invention realizes through following technical scheme: five automatic submerged-arc welding methods of a kind of heavy wall welded tube, comprise five welding wires, along the welding angle of inclination of five welding wires of welded tube direction of travel successively from the hypsokinesis of leaning forward.
Be followed successively by along five welding wires of welded tube direction of travel and the angle of inclination of solder side vertical line: a left side 17 degree, right 3 degree, right 11 degree, right 22 degree and right 33 degree.
Silk is 9d～11d before the electrode extension, and d is a gage of wire.
Article five, distance between weldingwires is 15～30mm, along five distances between weldingwires increase a little successively of welded tube direction of travel.
Welding current along five welding wires of welded tube direction of travel reduces by 70～90% successively.
The weldingvoltage of first welding wire is 31～34V, and back four filament voltages increase by 1～3V successively.
Article five, welding wire adopts the configuration of DC-AC AC-battery power source: be followed successively by DC-AC-AC-AC-AC along the welded tube direction of travel.
When AC power supplies connected, the phase difference of electric current was 120o.
Compared with prior art, the invention has the beneficial effects as follows: the present invention can make the welding bead root complete penetration of weldment, and a welding fabrication can not produce more weld defect, has higher productivity ratio, and the heat affected area is little even with weld structure.It can be widely used in the production of large batch of longitudinal submerged arc welded pipe.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the weld seam photomacrograph;
Fig. 3 is a weld seam central tissue photo;
Fig. 4 is that photo is organized in the heat affected area;
Among the figure: the 1-welding wire.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is done further detailed explanation:
As shown in Figure 1, five automatic submerged-arc welding methods of a kind of heavy wall welded tube of the present invention comprise five welding wires 1, and it has obtained stable property of welded joint, and concrete embodiment is:
1, power configuration and connected mode:
Interior outside weld five wire bonds adopt five four power supply solder technology of lap siding.Power supply uses Lincoln's DC, AC power supplies, and adopts DC-AC AC-battery power source configuration: DC-AC-AC-AC-AC.When AC power supplies connected, the phase difference that makes electric current was 120o, avoided the electromagnetic interference that produces between AC electric arc, the smooth combustion of electric arc when guaranteeing welding effectively.
2, the locus of welding wire 1:
Being provided with the pattern and the quality influence of stability, the weld seam of welding of welding wire 1 locus (welding wire 1 inclination angle, spacing, elongation, arrangement linearity) is very big.
When other conditions do not change, the fusion penetration when welding wire 1 leans forward than hypsokinesis is big, and the weld seam of hypsokinesis when leaning forward is wide.In the present embodiment; Article five, the angle of inclination of welding wire 1 and solder side vertical line is followed successively by, a left side 17 degree, right 3 degree, right 11 degree, right 22 degree and right 33 degree, and the welding quality that obtains is best; Welding wire 1 spacing is more little; Fusion penetration is dark more, but burns easily during the too small welding of spacing, crosses the stability and the appearance of weld of affects electric arc.Welding wire 1 extension elongation increases, and weld reinforcement increases, and fusion penetration reduces; If extension elongation is too small, the easy dry slag of ignition tip makes two adjacent ignition tips produce " electric arc " and influences the burning of normal arc.Welding wire 1 is vertically arranged as dislocation occurred, not on same straight line, can make the inner and outer welding disalignment on the one hand, also can influence the stability of electric arc on the other hand.
Through a large amount of experiment, optimize the locus that five wire bond welding wires 1, as shown in Figure 1, wherein, vertically or slightly lean forward excessively to hypsokinesis from article one welding wire 1 in welding wire 1 angle of inclination, and silk is 9d～11d (d is welding wire 1 diameter) before welding wire 1 extension elongation; Welding wire 1 spacing 15～30mm, welding wire 1 spacing increases successively a little, in the present embodiment, is followed successively by 17,18,19 and 21 mm.
3, welding parameter:
Thick-walled pipe when welding, in order to enhance productivity, time moulding of interior outside weld homogeneous, the heat input is bigger, and overheated zone crystal grain is thick easily.In order to prevent the embrittlement of heat affected area, during interior outside weld, under the prerequisite that guarantees quality of weld joint, should use little welding conditions as far as possible.On the other hand, can utilize five wire bonds to realize the characteristics of high-speed welding, cooling velocity is accelerated, limit growing up of austenite crystal, thereby reduce the tendency of heat affected area grain growth.
Welding current and voltage:
The shape of welding current and voltage butt welded seam has crucial influence.Nearly 8 of the number of parameters that five wire bond electric currents, voltage can be regulated through electric current, the voltage of adjusting each power supply, can change the degree of depth, the width in molten bath, the reinforcement of weld seam.Welding wire 1 each electrode role is following: the fusion penetration of 1 principal security weld seam; 2,3 mainly as filling metal and control the width at weld seam middle part, but also have certain effect for fusion penetration; 4,5 mainly is the quality of control face of weld moulding.
When electric current was selected, 1 electric current was selected big electric current as far as possible under the situation of source of welding current capacity permission, and to guarantee under the situation that obtains enough fusion penetrations, higher speed of welding being arranged, back four electric currents reduce by 70～90% successively.When voltage is selected, should select less voltage as far as possible for 1, generally preferable in 31～34V scope, back four filament voltages increase by 1～3V successively.
Speed of welding:
Though high-speed welding has certain effect to suppressing the heat affected area embrittlement, excessive velocities makes metallurgical reaction abundant inadequately easily, increases the tendency that defective produces, and influences the stability of weldquality.In addition, we draw through experiment, and speed of welding mainly influences the fusion penetration of weld seam with molten wide, and weldering speed is fast more, and fusion penetration is with molten wide more little; And the almost not influence of the reinforcement of the adjustment butt welded seam of weldering speed.
When selecting speed of welding, should rationally confirm according to various factors.
4, the selection of wlding
X70～X80 pipe line steel C content is low, S, and P harmful element content is lower, and solidification cracking tendency is little, through coupling C, S, wlding that the P element is low, avoids the generation of welding point crackle.Through screening; The C type and the D type welding wire for submerged-arc welding 1 that contain the low and high strength of S, P amount, high tenacity have been selected for use; And coupling has the fluorine alkalescent sintered flux of certain viscosity; It is main tissue with the acicular ferrite that postwelding has obtained, and makes the intensity of welding point and the requirement that toughness can both satisfy standard and client's technique complementary standard.
Table 1 C type welding wire chemical composition (w%)
| Element | C | Mn | Si | S | P | B | Ti | Mo |
| Mass fraction | 0.07 | 1.46 | 0.17 | 0.003 | 0.009 | 0.006 | 0.04 | 0.34 |
Table 2 D type welding wire chemical composition (w%)
| Element | C | Mn | Si | S | P | B | Ti | Ni |
| Mass fraction | 0.09 | 1.72 | 0.06 | 0.003 | 0.010 | 0.005 | 0.13 | 0.30 |
The non-destructive inspection of weld quality has guaranteed the quality of weld seam through strict controlling of production process.The steel pipe that adopts five submerged welding processes to produce, UT, RT first-time qualification rate have all reached 94%.
Fig. 2 is the weld seam photomacrograph, in the production process, through electric current, the voltage of adjusting each electrode, obtains good weld seam pattern.
Fig. 3 is a weld seam central tissue photo; Fig. 4 is that photo is organized in the heat affected area, and by visible among the figure, the weld seam central tissue of welded tube is main with the intercrystalline nucleation acicular ferrite mainly all; Organize the heat affected area is main with granular bainite mainly all, and weld seam and heat affected area have good impact flexibility.
Impact property that the weld seam experiment obtains such as following table 3, table 4, each item mechanical property all meet international and national standard and the additional specification requirement of client.
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Table 3 weld seam impact property (20 ℃)
Table 4 weld seam cross directional stretch, bending property
After through the consideration of various factors and a large amount of experiment, the speed of welding that five wire bonds are produced steel pipe is 1.60m/min, compares with welding such as two, three, and it is nearly 30% that speed of welding has improved, and improved production efficiency.
Conclusion:
(1) through the spatial distribution of configuration, connected mode and welding wire 1 of adjustment power supply, can avoid each interelectrode interference of five submerged-arc weldings, make arc stability burning in the welding process.
Nearly 9 of the parameters that can regulate in (2) five submerged-arc welding welding processes are reasonably adjusted parameter, can obtain good weld seam pattern.
(3) adopt five submerged-arc weldings, and coupling C type, D type welding wire 1 and fluorine alkalescent sintered flux, both guaranteed that high grade of steel thick-walled pipe has the welding point of high strength, high tenacity, had improved the production efficiency of thick-walled pipe again.Experiment shows that wall thickness 21mm steel pipe seam-20 a ℃ ballistic work reaches 180J, and 0 ℃ of ballistic work of wall thickness 28.6mm steel pipe seam reaches 190J.
(4) five submerged welding processes successfully are applied in the high grade of steel thick walled steel tube production.
The present invention is not limited to above-mentioned embodiment; If various changes of the present invention or distortion are not broken away from the spirit and scope of the present invention; If these changes and distortion belong within claim of the present invention and the equivalent technologies scope, then the present invention also is intended to comprise these changes and distortion.
Claims (8)
1. five automatic submerged-arc welding methods of a heavy wall welded tube comprise five welding wires, it is characterized in that: along the welding angle of inclination of five welding wires of welded tube direction of travel successively from the hypsokinesis of leaning forward.
2. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 1 is characterized in that: saidly be followed successively by along five welding wires of welded tube direction of travel and the angle of inclination of solder side vertical line: a left side 17 degree, right 3 degree, right 11 degree, right 22 degree and right 33 degree.
3. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 1 is characterized in that: silk is 9d～11d before the said electrode extension, and d is a gage of wire.
4. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 1 is characterized in that: said five distances between weldingwires are 15～30mm, along five distances between weldingwires increase a little successively of welded tube direction of travel.
5. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 1, it is characterized in that: the welding current along five welding wires of welded tube direction of travel reduces by 70～90% successively.
6. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 1, it is characterized in that: the weldingvoltage of first welding wire is 31～34V, back four filament voltages increase by 1～3V successively.
7. according to five automatic submerged-arc welding methods of each described a kind of heavy wall welded tube of claim 1 to 6, it is characterized in that: five welding wires adopt the configuration of DC-AC AC-battery power source: be followed successively by DC-AC-AC-AC-AC along the welded tube direction of travel.
8. five automatic submerged-arc welding methods of a kind of heavy wall welded tube according to claim 7 is characterized in that: when AC power supplies connected, the phase difference of electric current was 120o.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012102471607A CN102744505A (en) | 2012-07-17 | 2012-07-17 | Automatic five-wire submerged arc welding method for thick-wall welded pipes |
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| CN2012102471607A CN102744505A (en) | 2012-07-17 | 2012-07-17 | Automatic five-wire submerged arc welding method for thick-wall welded pipes |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103894712A (en) * | 2012-12-26 | 2014-07-02 | 日铁住金溶接工业株式会社 | Tunnel type pipe forming welding method and device |
| CN104801828A (en) * | 2012-12-20 | 2015-07-29 | 天津大学 | Application of four-wire-integrated welding method |
| CN111203614A (en) * | 2020-01-16 | 2020-05-29 | 燕山大学 | Device for assisting LSAW pipe welding process through pulse current and using method |
| CN113953714A (en) * | 2021-11-01 | 2022-01-21 | 江苏九洲新材料科技有限公司 | Flux-cored wire for nickel-based alloy |
-
2012
- 2012-07-17 CN CN2012102471607A patent/CN102744505A/en active Pending
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104801828A (en) * | 2012-12-20 | 2015-07-29 | 天津大学 | Application of four-wire-integrated welding method |
| CN104801828B (en) * | 2012-12-20 | 2017-02-22 | 天津大学 | Application of four-wire-integrated welding method |
| CN103894712A (en) * | 2012-12-26 | 2014-07-02 | 日铁住金溶接工业株式会社 | Tunnel type pipe forming welding method and device |
| CN103894712B (en) * | 2012-12-26 | 2017-07-11 | 日铁住金溶接工业株式会社 | Tunnel type pipe forming welding method and device |
| CN111203614A (en) * | 2020-01-16 | 2020-05-29 | 燕山大学 | Device for assisting LSAW pipe welding process through pulse current and using method |
| CN111203614B (en) * | 2020-01-16 | 2021-05-25 | 燕山大学 | Device for assisting LSAW pipe welding process through pulse current and using method |
| CN113953714A (en) * | 2021-11-01 | 2022-01-21 | 江苏九洲新材料科技有限公司 | Flux-cored wire for nickel-based alloy |
| CN113953714B (en) * | 2021-11-01 | 2023-03-14 | 江苏九洲新材料科技有限公司 | Flux-cored wire for nickel-based alloy |
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Application publication date: 20121024 |