CN104259635A - Submerged arc welding technology for backing-weld-free connection of K-type groove - Google Patents
Submerged arc welding technology for backing-weld-free connection of K-type groove Download PDFInfo
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- CN104259635A CN104259635A CN201410371329.9A CN201410371329A CN104259635A CN 104259635 A CN104259635 A CN 104259635A CN 201410371329 A CN201410371329 A CN 201410371329A CN 104259635 A CN104259635 A CN 104259635A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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Abstract
The invention discloses a submerged arc welding technology for backing-weld-free connection of a K-type groove. A submerged arc welding groove is designed to be in a K type; the value of an angle alpha and the value of an angle gamma range from 45 degrees to 55 degrees, and the gamma is smaller than or equal to alpha; the truncated edge b ranges from 0 mm to 2mm; the groove clearance e ranges from 1 mm to 3 mm; when first submerged arc welding is applied, the back face of a welding joint is densely filled with welding flux and is tightly sealed by a welding flux backing, and the included angle beta between a welding torch and the straight side of a test piece ranges from 30 degrees to 40 degrees; the top end of a welding wire is in contact with the straight side of the groove, the distance f between the top end of the welding wire and the bottom of the groove ranges from 3 mm to 4 mm, and the straight side is preferably and fully soaked with molten drops. According to welding technological parameters, when first welding is carried out, the welding current ranges from 300 A to 450 A, the welding voltage ranges from 25 V to 32 V, and the welding speed ranges from 250 mm/min to 400 mm/min. According to the welding technology, the K-type groove is adopted, the working procedure can be simplified, gas shielded welding or welding rod welding backing is not needed, submerged arc welding is directly adopted in first welding, double-face welding is achieved, the back chipping working procedure can be reduced, and meanwhile welding defects caused by backing weld and back chipping can be removed. Through groove and welding technology adjustment, the welding cracks generated by first welding are avoided, and the quality of a joint is improved.
Description
Technical field
The invention belongs to ferrous materials welding field, relate to a kind of submerged-arc welding process, specifically a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove.
Background technology
K type groove is a kind of form that slab welding and T connector full penetration often adopt in Practical Project, particularly some Welding on Properties of Welding Joint require higher field, as offshore engineering structure part, consider its severe Service Environment, the comprehensive mechanical performance of general butt welded seam quality and welding point requires very high, welding point adopts K type bevel design usually, and domestic and international classification society is K type to the groove that the welding approral test of thicker steel ship plate also General Requirements uses.
Submerged-arc welding is a kind of welding method of welding heavy plate K type groove and commonly using, and during welding, generally needs to adopt gas shielded arc welding or welding rod weldering bottoming, then carries out back chipping process, complex process.During backing welding, in order to prevent burning, general small area analysis of selecting welds, and easily occurs lack of penetration phenomenon; When welding structural element thickness is larger; groove chin-deep; due to the restriction of jet size, welding wire is difficult to reach bottom groove, and swings difficulty; also not easily electric arc is seen; bring difficulty to operation, to make welding wire reach bottom groove, then welding wire stretches out long; cause gas shield not good, easily form pore.
During back chipping process, normal employing carbon arc air gouging and grinder buffing, the weld seam glacing flatness after gouge is poor, and very easily digs the groove of an oblique cutting test plate (panel) straight flange side root, after producing groove, easily produces weld defect herein.In addition, backing weld seam place groove is narrower, and root scarfing cinder not easily, also easily produces the defect such as incomplete fusion and slag inclusion in follow-up welding.Therefore, when butt welded seam carries out radiographic inspection (RT) or ultrasonic examination (UT), often find root of weld incomplete fusion or lack of penetration in various degree, need to reprocess, greatly reduce product percent of pass and add production cost.
Summary of the invention
Technical problem to be solved by this invention is; overcome the shortcoming of prior art; a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove is provided; the welding procedure of the present invention's design adopts K type groove; operation can be simplified; undesirable gas protection weldering or welding rod weldering bottoming; Article 1, welding bead directly adopts submerged arc welding; double-faced forming; reduce back chipping operation, eliminate the weld defect that backing welding and back chipping cause, by groove and welding procedure adjustment simultaneously; the weld crack produced when avoiding first to weld, improves joint quality.
In order to solve above technical problem, the invention provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, submerged arc welding bevel design is K type, the value of bevel angle α, γ is all 45-55 °, γ≤α, root face b is 0-2mm, groove gap e is 1-3mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 30 °-40 °, welding wire tip contact groove straight flange be 3-4mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 300-450A, and weldingvoltage is 25-32V, and speed of welding is 250-400mm/min.
The technical scheme that the present invention limits further is:
When groove is asymmetric, first weldering is executed in the side that, the degree of depth little in bevel angle is large.
The present invention takes the design of rational bevel angle, root face and groove gap size, and when first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, by adjustment welding wire angle and position, controls heat input and speed of welding; Submerged arc welding bevel design is K type, the value of bevel angle α, γ is all 45-55 °, γ≤α, root face b are 0-2mm, and groove gap e is 1-3mm, when executing first weldering, make the angle β of welding torch and test specimen straight flange be 30 °-40 °, welding wire tip contact groove straight flange be 3-4mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange, when ensureing to execute first weldering with low_input_power, can through welding and don't can produce seriously burn.
When executing first weldering, the angle β of welding torch and test specimen straight flange is made to control between 30 °-40 °, welding wire tip contact groove straight flange be 3-4mm with the distance f bottom groove, molten drop is allowed preferentially fully to infiltrate straight flange, contained distributed force when weld seam being solidified and cools is adjusted, thus improve stress distribution, reduce crackle tendency.
Further,
The invention provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, submerged arc welding bevel design is K type, bevel angle α is 55 °, γ is 45 °, root face b is 0, and groove gap e is 3mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 30 °, welding wire tip contact groove straight flange be 4mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 310 ± 10A, and weldingvoltage is 28 ± 2.5V, and speed of welding is 250mm/min.
The invention provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, submerged arc welding bevel design is K type, bevel angle α is 55 °, γ is 50 °, root face b is 2mm, and groove gap e is 1mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 40 °, welding wire tip contact groove straight flange be 3mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 440 ± 10A, and weldingvoltage is 29 ± 2.5V, and speed of welding is 400mm/min.
The invention provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, submerged arc welding bevel design is K type, bevel angle α is 45 °, γ is 45 °, root face b is 1mm, and groove gap e is 2mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 35 °, welding wire tip contact groove straight flange be 3.5mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 380 ± 10A, and weldingvoltage is 28 ± 2.5V V, and speed of welding is 320mm/min.
The invention has the beneficial effects as follows:
When the present invention adopts submerged-arc welding to execute Article 1 welding bead, for asymmetric groove, groove is comparatively dark and angle smaller side executes first weldering, i.e. γ≤α, to reduce first weld width, thus reduce cooling meat amount, make welding heat source be in weldment thickness middle, cooling velocity is comparatively large, is beneficial to the thermograde improving weld seam in welding and cooling procedure simultaneously, thermal stress is made to be eased like this, degradation crackle tendency; When executing first weldering, bottom weld seam, groove filling flux, seals with welding flux backing, makes solder flux be filled in groove bottom weld seam densely, to realize single face welding and double face shaping; Because the asymmetry of straight flange and groove, and in the depth direction, the change width of weld seam is large, because thermal stress, easily crack during welding, therefore during welding, make the angle β of the straight flange of welding torch and straight flange test specimen control between 30 °-40 °, welding wire top contacts with groove straight flange and is 3-4mm with the distance f bottom groove, molten drop is allowed preferentially fully to infiltrate straight flange, contained distributed force when weld seam being solidified and cools is adjusted, thus improves stress distribution, reduces crackle tendency.
On the other hand, welding pool is in process of setting, and grain growth is along thermograde direction, i.e. R is orthogonal with thermoisopleth for grain growth speed, and R and speed of welding v meets relational expression: R=v cos θ, and final set place forms scalelike mark; Under the input of certain heat, speed of welding is faster, molten bath becomes elongated, the angle of grain growth direction and axis of a weld is comparatively large, and when solidifying, lower melting point inclusion is pulled to Weld pipe mill, easily produces longitudinal crack, and the present invention adopts the speed of welding of 250-400mm/min, not only can reduce crackle tendency, and facilitate stable process of setting, firm welding.
Simplicity of design of the present invention, handled easily, technique scheme; easily realize in welding process; by adopting technique scheme, the technique reducing gas shielded arc welding bottoming and back chipping can be realized, directly adopting submerged-arc welding to realize whole welding process; greatly improve Automation of Welding degree; reduce the amount of labour, enhance productivity, and subtract dirt noise reduction; be beneficial to environmental protection, can welding field be widely used in.
Accompanying drawing explanation
Fig. 1 is the design diagram of K type groove of the present invention;
Fig. 2 is that the present invention executes weld seam layout schematic diagram when first welds;
Fig. 3 is weld seam of the present invention grain growth velocity analysis figure when solidifying;
Wherein, α, γ-K type bevel angle, t-thickness of slab, e-groove gap, b-root face, β-welding torch and groove straight flange angle, f-executes welding wire and groove distance from bottom when first welds;
1-K type groove test specimen, 2-welding torch center line, 3-straight flange test specimen, 4-solder flux, 5-welding flux backing, 6-molten bath, 7-crystallization direction, 8-thermoisopleth, 9-scalelike mark, 10-axis of a weld.
Detailed description of the invention
Embodiment 1
The present embodiment provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, structure as shown in Figure 1, Figure 2, Figure 3 shows, the K type groove test specimen of thickness t=50mm, K type bevel angle α=55 °, dark 20mm, thickness of slab γ=45 °, root face b=0mm, groove gap e=3mm;
When executing first weldering, in bevel angle γ=45 °, the side that groove is darker, welding torch and groove straight flange angle β are 30 °, and executing welding wire and groove distance from bottom f when first welds is 4mm; ° side, bevel angle α=55, dense packing effect solder flux, posts the tight soldering and sealing agent of welding flux backing;
When executing first weldering, welding current is 310 ± 10A, and weldingvoltage is 28 ± 2.5V, and speed of welding is 250mm/min;
Remaining welding bead adopts larger current and higher speed of welding, and between road, temperature is less than 200 DEG C, and detailed welding parameter is as shown in table 1.
Table 1 submerged-arc welding process parameter
Embodiment 2
The present embodiment provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, and structure as shown in Figure 1, Figure 2, Figure 3 shows, chooses the K type groove test specimen of thickness t=50mm, K type bevel angle α=55 °, dark 20mm, γ=50 °, root face b=2mm, groove gap e=1mm;
When executing first weldering, in bevel angle γ=50 °, the side that groove is darker, welding torch and groove straight flange angle β are 40 °, and executing welding wire and groove distance from bottom f when first welds is 3mm; ° side, bevel angle α=55, dense packing effect solder flux, posts the tight soldering and sealing agent of welding flux backing;
When executing first weldering, welding current is 440 ± 10A, and weldingvoltage is 29 ± 2.5V, and speed of welding is 400mm/min;
Remaining welding bead adopts larger current and higher speed of welding, and between road, temperature is less than 200 DEG C, and detailed welding parameter is as shown in table 2.
Table 2 submerged-arc welding process parameter
Embodiment 3
The present embodiment provides a kind of submerged-arc welding process of exempting from backing welding and connecting K type groove, and structure as shown in Figure 1, Figure 2, Figure 3 shows, chooses the K type groove test specimen of thickness t=50mm, K type bevel angle α=45 °, dark 20mm, γ=45 °, root face b=1mm, groove gap e=2mm;
When executing first weldering, in bevel angle γ=45 °, the side that groove is darker, welding torch and groove straight flange angle β are 35 °, and executing welding wire and groove distance from bottom f when first welds is 3.5mm; ° side, bevel angle α=50, dense packing effect solder flux, posts the tight soldering and sealing agent of welding flux backing;
When executing first weldering, welding current is 380 ± 10A, and weldingvoltage is 28 ± 2.5V, and speed of welding is 320mm/min;
Remaining welding bead adopts larger current and higher speed of welding, and between road, temperature is less than 200 DEG C, and detailed welding parameter is as shown in table 3.
Table 3 submerged-arc welding process parameter
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (5)
1. the submerged-arc welding process of exempting from backing welding and connecting K type groove, it is characterized in that, submerged arc welding bevel design is K type, the value of bevel angle α, γ is all 45-55 °, γ≤α, root face b is 0-2mm, groove gap e is 1-3mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 30 °-40 °, welding wire tip contact groove straight flange be 3-4mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 300-450A, and weldingvoltage is 25-32V, and speed of welding is 250-400mm/min.
2. the submerged-arc welding process of exempting from backing welding and connecting K type groove according to claim 1, is characterized in that, when groove is asymmetric, first weldering is executed in the side that, the degree of depth little in bevel angle is large.
3. the submerged-arc welding process of exempting from backing welding connection K type groove according to claim arbitrary in claims 1 to 3, it is characterized in that, submerged arc welding bevel design is K type, bevel angle α is 55 °, γ is 45 °, root face b is 0, groove gap e is 3mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 30 °, welding wire tip contact groove straight flange be 4mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 310 ± 10A, and weldingvoltage is 28 ± 2.5V, and speed of welding is 250mm/min.
4. the submerged-arc welding process of exempting from backing welding connection K type groove according to claim arbitrary in claims 1 to 3, it is characterized in that, submerged arc welding bevel design is K type, bevel angle α is 55 °, γ is 50 °, root face b is 2mm, groove gap e is 1mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 40 °, welding wire tip contact groove straight flange be 3mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 440 ± 10A, and weldingvoltage is 29 ± 2.5V, and speed of welding is 400mm/min.
5. the submerged-arc welding process of exempting from backing welding connection K type groove according to claim arbitrary in claims 1 to 3, it is characterized in that, submerged arc welding bevel design is K type, bevel angle α is 45 °, γ is 45 °, root face b is 1mm, groove gap e is 2mm, when executing first submerged-arc welding, back of weld dense packing effect solder flux also tightly seals with welding flux backing, and make the angle β of welding torch and test specimen straight flange be 35 °, welding wire tip contact groove straight flange be 3.5mm with the distance f bottom groove, and allow molten drop preferentially fully infiltrate straight flange;
Welding condition: when executing first weldering, welding current is 380 ± 10A, and weldingvoltage is 28 ± 2.5V V, and speed of welding is 320mm/min.
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Cited By (7)
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| CN104923893A (en) * | 2015-06-25 | 2015-09-23 | 江苏省沙钢钢铁研究院有限公司 | K-shaped groove submerged-arc welding technology for good shape of welded plate |
| CN105215519A (en) * | 2015-11-04 | 2016-01-06 | 唐山轨道客车有限责任公司 | The welding method of DHV type weld seam |
| CN105294245A (en) * | 2015-10-21 | 2016-02-03 | 蚌埠龙达农业专业合作社 | Planting soil suitable for magnolia denudata |
| CN112518083A (en) * | 2020-10-23 | 2021-03-19 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel K-shaped groove at low temperature |
| CN113182651A (en) * | 2021-04-25 | 2021-07-30 | 中建钢构天津有限公司 | H-shaped steel welding method without back chipping |
| CN114589379A (en) * | 2022-04-18 | 2022-06-07 | 山东蓬翔汽车有限公司 | Axle body longitudinal weld root gap local out-of-tolerance welding method |
| CN117862647A (en) * | 2023-12-19 | 2024-04-12 | 山东方垠智能制造有限公司 | T-shaped joint penetration weld construction method |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104923893A (en) * | 2015-06-25 | 2015-09-23 | 江苏省沙钢钢铁研究院有限公司 | K-shaped groove submerged-arc welding technology for good shape of welded plate |
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| CN112518083A (en) * | 2020-10-23 | 2021-03-19 | 南京钢铁股份有限公司 | Submerged-arc welding method for high-manganese austenitic steel K-shaped groove at low temperature |
| CN113182651A (en) * | 2021-04-25 | 2021-07-30 | 中建钢构天津有限公司 | H-shaped steel welding method without back chipping |
| CN114589379A (en) * | 2022-04-18 | 2022-06-07 | 山东蓬翔汽车有限公司 | Axle body longitudinal weld root gap local out-of-tolerance welding method |
| CN117862647A (en) * | 2023-12-19 | 2024-04-12 | 山东方垠智能制造有限公司 | T-shaped joint penetration weld construction method |
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Application publication date: 20150107 |