CN107876942A - Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint - Google Patents
Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint Download PDFInfo
- Publication number
- CN107876942A CN107876942A CN201711282262.1A CN201711282262A CN107876942A CN 107876942 A CN107876942 A CN 107876942A CN 201711282262 A CN201711282262 A CN 201711282262A CN 107876942 A CN107876942 A CN 107876942A
- Authority
- CN
- China
- Prior art keywords
- welding
- temperature impact
- impact toughness
- capping
- cover
- 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.)
- Pending
Links
- 238000003466 welding Methods 0.000 title claims abstract description 100
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 24
- 239000010959 steel Substances 0.000 title claims abstract description 24
- 239000011324 bead Substances 0.000 abstract description 8
- 230000014509 gene expression Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 6
- 238000010438 heat treatment Methods 0.000 description 5
- 238000010276 construction Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000742 Cotton Polymers 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009863 impact test Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000010583 slow cooling Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- RMLPZKRPSQVRAB-UHFFFAOYSA-N tris(3-methylphenyl) phosphate Chemical compound CC1=CC=CC(OP(=O)(OC=2C=C(C)C=CC=2)OC=2C=C(C)C=CC=2)=C1 RMLPZKRPSQVRAB-UHFFFAOYSA-N 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
- B23K9/18—Submerged-arc welding
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a normalizing steel submerged-arc welding method for improving low-temperature impact toughness of a welding joint, wherein a cover bead is welded from two sides to the middle, the welding current of the cover bead is 550-600A, the voltage is 25-27V, and the welding speed is 50-55 cm/min; the number of the cover tracks n is (h + m-50)/20, wherein h is the plate thickness, and m is the groove angle; when two sides are welded, the distance d between the welding wire and the two side walls is 4- (m-50)/30. According to the invention, the relational expressions of the number of the cover surface tracks, the distances between the welding wires and the two sides during the cover surface, the angle of the groove and the plate thickness are respectively fitted according to the influences of factors such as the number of the cover surface tracks, the distances between the welding wires and the two sides during the cover surface and the like on the low-temperature impact toughness of the welding seam and the heat affected zone, so that the submerged-arc welding process can be regularly circulated, and the low-temperature impact toughness of the welding seam and the heat affected zone is effectively ensured by standardizing the number of the cover surface tracks, adjusting the welding direction of the welding bead of the cover.
Description
Technical field
The invention belongs to welding technique, and in particular to a kind of normalized steel submerged-arc welding for improving welding point low-temperature impact toughness
Welding method.
Background technology
With the maximization of steel construction and the raising of safe class, it disclosure satisfy that -40 DEG C of impact properties require (E levels)
Steel plate has gradually obtained widely used in large-scale national project.In view of the uniformity of cut deal mechanical property, normalized steel exists
Some mega projects are applied, but normalized steel alloying element content is higher, and the tendency of hardenability of welding heat affected zone has increased
Add.The normalized steel relatively low to intensity rank and carbon equivalent, cold cracking inclination is little, but welding point low-temperature impact toughness is usually not easy
It is met, and the welding procedure of TMCP steel plates is still transplanted completely when carrying out normalized steel welding by steel construction factory mostly, and then
Welding point Seam and heat effected zone low-temperature impact toughness occur can not meet to require.
It is capping passage for whole Seam and heat effected zone impact flexibility most weak part, because remaining passage is all passed through
The heat treatment process of passage below, its low-temperature impact toughness, which is obtained for, to be significantly improved, and capping passage does not pass through this
Process, Seam and heat effected zone crystal grain is very thick, and preceding slow cooling together is handled together not after, and cooling rate is relatively
It hurry up, some hard phase constitutions more or less occur.So the Seam and heat effected zone impact flexibility of capping passage is worst.Steel construction factory
Typically remove 2 millimeters of positions on welding point surface and carry out -40 DEG C of impact tests, detect the most thin of whole weld seam and welding point
Weak link, therefore it is particularly important by adjusting welding procedure to improve the low-temperature impact toughness of capping passage.And traditional capping work
Skill ensures that weld seam fills up simply by real-time appropriate process is adjusted, during capping mechanicalness from left to right or from right to left, weld seam
Shaping meets requirement, seldom considers the mechanical property of Seam and heat effected zone.
The content of the invention
In view of the shortcomings of the prior art, it is an object of the invention to propose a kind of raising welding point low-temperature impact toughness
Normalized steel buried arc welding method, the present invention is by specification capping road number, the welding direction for adjusting final pass, welding wire away from both sides
Wall distance and control capping heat input and effectively improve the low-temperature impact toughness of whole Seam and heat effected zone weakest link.
For achieving the above object, present invention employs following technical scheme：
A kind of normalized steel buried arc welding method for improving welding point low-temperature impact toughness, comprises the following steps：
(1) normalized steel thickness of slab>30mm, welding groove are double V groove, and bevel angle is 50-60 °, root face 5mm, big slope
Mouth, fit-up gap 0 thicker 5mm than small groove；
(2) backing run welding and middle pass weld；
(3) final pass welds：Welded from both sides to centre, final pass welding current is 550~600A, voltage 25
~27V, speed of welding are 50~55cm/min；Capping road number n=(h+m-50)/20, wherein, h is thickness of slab, and m is groove angle
Degree；When welding both sides, welding wire is away from two side distance d=4- (m-50)/30.
Further, backing run in the normalized steel buried arc welding method of described raising welding point low-temperature impact toughness
Welding current is 550~600A, and voltage is 25~27V, and speed of welding is 50~55cm/min.
Further, middle welding bead in the normalized steel buried arc welding method of described raising welding point low-temperature impact toughness
Welding current is 650~750A, and voltage is 30~32V, and speed of welding is 40~42cm/min.
Above-mentioned processing step is described as follows：
1) reduce thermal weld stress within the specific limits, Seam and heat effected zone low-temperature impact toughness can be effectively improved,
Because capping passage not after together to it is preceding together heat treatment process, be whole welding point weakest link, institute
It is relatively reduced with the heat input of capping passage.
2) for welded seam area, left and right twice infall is weakness zone, and after the heat treatment after together, impact is tough
Property relative can improve, final pass be welded from both sides to centre so that last one of weld seam is covered in Weld pipe mill, can effectively be protected
Demonstrate,prove the heat treatment process after together at the cross-seam of layer second from the bottom.
3) capping road number is excessive, and reinforcement is excessive, and capping road number is very few, and filling is discontented, and capping road number is with thickness of slab and slope
The increase of bicker degree will be adjusted accordingly.
4) for heat affected area, coarse grain zone is most weak part, and during capping, when welding both sides, welding wire is away from two side distance
It is particularly important, this distance can cause before together coarse grain zone just past capping road heat treatment process, if this away from
From excessive, it is impossible to ensure that coarse grain zone is all heat-treated, if apart from too small, lid cotton cap is excessive, it may appear that toe crack.
Compared with prior art, the present invention at least has the advantages that：
1. the present invention is low to Seam and heat effected zone according to the factor such as lateral extent of welding wire distance two when capping road number and capping
The influence of warm impact flexibility, the lateral extent of welding wire distance two and bevel angle when fitting capping road number and capping respectively, thickness of slab
Relational expression so that submerged welding process is regular to follow.
2. the present invention is by specification capping road number, the welding direction for adjusting final pass, welding wire away from two side distance and control
Capping heat input processed, effectively improve the low-temperature impact toughness of whole Seam and heat effected zone weakest link.
Brief description of the drawings
Double V groove processing and the assembling figure that Fig. 1 is the thick extra large work steel EH47 of 50mm；
Fig. 2 is 50mm thickness of slab capping schematic diagrames in embodiment 1；
Fig. 3 is 50mm thickness of slab capping schematic diagrames in comparative example 1；
The double V groove processing and assembling figure that Fig. 4 is 100mm thickness bridge steels Q420qE；
Fig. 5 is 100mm thickness of slab capping schematic diagrames in embodiment 2；
Fig. 6 is 100mm thickness of slab capping schematic diagrames in comparative example 2.
Embodiment
Technical scheme is described in further detail below in conjunction with accompanying drawing and some preferred embodiments, but not only
It is limited only to this.
Embodiment 1
Prepare test piece for welding EH47, label A, thickness of slab 50mm, bevel angle is 60 °, and retaining wall on slope and assembling are such as Fig. 1 institutes
Show.
A is from the buried arc welding method in the present invention, and it is 3 to be computed capping road number, and welding wire is apart from side wall distance
3.7mm, submerged-arc welding process parameter are shown in Table 1, and capping schematic diagram is shown in Fig. 2.
Submerged welding process parameter in the embodiment 1 of table 1
| Weld passage | Welding current (A) | Weldingvoltage (V) | Speed of welding (cm/min) | Thermal weld stress (kJ/cm) |
| Bottoming | 550 | 25 | 50 | 16.5 |
| Middle welding bead | 730 | 30 | 40 | 32.8 |
| Capping 2 | 600 | 27 | 50 | 19.4 |
Comparative example 1
It is 60 ° to prepare with identical test piece for welding EH47, label B, thickness of slab 50mm in embodiment 1, bevel angle,
Retaining wall on slope and assembling are as shown in Figure 1.
B uses traditional submerged-arc welding process, and submerged-arc welding process parameter is shown in Table 2, and capping schematic diagram is shown in Fig. 3.
Submerged welding process parameter in the comparative example 1 of table 2
| Weld passage | Welding current (A) | Weldingvoltage (V) | Speed of welding (cm/min) | Thermal weld stress (kJ/cm) |
| Bottoming | 550 | 25 | 50 | 16.5 |
| Middle welding bead | 700 | 29 | 40 | 30.4 |
| Capping 2 | 680 | 30 | 42 | 29.1 |
A and B has welded 19 passages, and weld interval is identical.Surface removes 2 millimeters, carries out -40 DEG C of impact property detections,
Heat affected area takes melt run+1mm positions, and table 3 is comparing result, and compared with using traditional capping technique, use is of the present invention
When technique carries out capping, heat affected area low-temperature impact toughness is remarkably reinforced.
The Impulse Test Result of table 3 contrasts
Embodiment 2
Prepare test piece for welding Q420qE, label C, thickness of slab 100mm, bevel angle is 50 °, and retaining wall on slope and assembling are as schemed
Shown in 4.
C is from the buried arc welding method in the present invention, and it is 5 to be computed capping road number, and welding wire is apart from side wall distance
4mm, submerged-arc welding process parameter are shown in Table 4, and capping schematic diagram is shown in Fig. 5.
Submerged welding process parameter in the embodiment 2 of table 4
| Weld passage | Welding current (A) | Weldingvoltage (V) | Speed of welding (cm/min) | Thermal weld stress (kJ/cm) |
| Bottoming | 570 | 27 | 52 | 17.8 |
| Middle welding bead | 730 | 30 | 40 | 32.8 |
| Capping 5 | 580 | 27 | 51 | 18.4 |
Comparative example 2
Identical test piece for welding Q420qE, label D, thickness of slab 100mm in preparation and embodiment 2, bevel angle are
50 °, retaining wall on slope and assembling are as shown in Figure 4.
D uses traditional submerged-arc welding process, and submerged-arc welding process parameter is shown in Table 5, and capping schematic diagram is shown in Fig. 6.
Submerged welding process parameter in the comparative example 2 of table 5
| Weld passage | Welding current (A) | Weldingvoltage (V) | Speed of welding (cm/min) | Thermal weld stress (kJ/cm) |
| Bottoming | 570 | 27 | 52 | 17.8 |
| Middle welding bead | 720 | 30 | 40 | 32.4 |
| Capping 4 | 700 | 30 | 43 | 29.3 |
C and D has welded 98 passages, and weld interval is identical.Surface removes 2 millimeters, carries out -40 DEG C of impact property detections,
Heat affected area takes melt run+1mm positions, and table 6 is comparing result, and compared with using traditional capping technique, use is of the present invention
When technique carries out capping, heat affected area low-temperature impact toughness is remarkably reinforced.
The Impulse Test Result of table 6 contrasts
Besides these examples, the present invention can also have other embodiment.It is all to use equivalent substitution or equivalent transformation shape
Into technical scheme, all fall within the protection domains of application claims.
Claims (3)
- A kind of 1. normalized steel buried arc welding method for improving welding point low-temperature impact toughness, it is characterised in that：Including as follows Step：(1) normalized steel thickness of slab>30mm, welding groove are double V groove, and bevel angle is 50-60 °, root face 5mm, big groove ratio Small groove thickness 5mm, fit-up gap 0；(2) backing run welding and middle pass weld；(3) final pass welds：Welded from both sides to centre, final pass welding current be 550~600A, voltage for 25~ 27V, speed of welding are 50~55cm/min；Capping road number n=(h+m-50)/20, wherein, h is thickness of slab, and m is bevel angle；Weldering When connecing both sides, welding wire is away from two side distance d=4- (m-50)/30.
- 2. the normalized steel buried arc welding method according to claim 1 for improving welding point low-temperature impact toughness, it is special Sign is：Described backing run welding current is 550~600A, and voltage is 25~27V, and speed of welding is 50~55cm/ min。
- 3. the normalized steel buried arc welding method according to claim 1 for improving welding point low-temperature impact toughness, it is special Sign is：Described middle pass weld electric current is 650~750A, and voltage is 30~32V, and speed of welding is 40~42cm/ min。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711282262.1A CN107876942A (en) | 2017-12-07 | 2017-12-07 | Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711282262.1A CN107876942A (en) | 2017-12-07 | 2017-12-07 | Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107876942A true CN107876942A (en) | 2018-04-06 |
Family
ID=61773373
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711282262.1A Pending CN107876942A (en) | 2017-12-07 | 2017-12-07 | Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107876942A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110598357A (en) * | 2019-09-25 | 2019-12-20 | 华中科技大学 | Welding joint stress deformation simulation method, device, equipment and storage medium |
| CN110834177A (en) * | 2019-10-28 | 2020-02-25 | 中国石油大学(华东) | Method for reducing welding residual stress of large pressure vessel |
| CN112575623A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Butt welding plate group, turnout beam and processing method of butt welding plate group |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101288919A (en) * | 2007-12-27 | 2008-10-22 | 中铁四局集团有限公司 | Welding method for thick plate and ultra-thick plate of 50-120 mm |
| CN103071897A (en) * | 2013-01-28 | 2013-05-01 | 南京钢铁股份有限公司 | Submerged arc welding technology of steel plate for low temperature storage tank |
| CN103406644A (en) * | 2013-08-20 | 2013-11-27 | 中国海洋石油总公司 | Submerged-arc welding process for longitudinal seam and circular seam welding of pipe sections |
| CN103920975A (en) * | 2014-04-17 | 2014-07-16 | 中冶建筑研究总院有限公司 | Automatic submerged-arc welding process of high-performance structural steel Q460GJC for buildings |
-
2017
- 2017-12-07 CN CN201711282262.1A patent/CN107876942A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101288919A (en) * | 2007-12-27 | 2008-10-22 | 中铁四局集团有限公司 | Welding method for thick plate and ultra-thick plate of 50-120 mm |
| CN103071897A (en) * | 2013-01-28 | 2013-05-01 | 南京钢铁股份有限公司 | Submerged arc welding technology of steel plate for low temperature storage tank |
| CN103406644A (en) * | 2013-08-20 | 2013-11-27 | 中国海洋石油总公司 | Submerged-arc welding process for longitudinal seam and circular seam welding of pipe sections |
| CN103920975A (en) * | 2014-04-17 | 2014-07-16 | 中冶建筑研究总院有限公司 | Automatic submerged-arc welding process of high-performance structural steel Q460GJC for buildings |
Non-Patent Citations (3)
| Title |
|---|
| 徐峰: "《焊接工艺简明手册》", 30 September 2014 * |
| 李静等: "低温钢16MnDR焊接工艺研究", 《热加工工艺》 * |
| 王恩建: "14MnNbq正火钢对接焊缝埋弧焊工艺", 《焊接技术》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110598357A (en) * | 2019-09-25 | 2019-12-20 | 华中科技大学 | Welding joint stress deformation simulation method, device, equipment and storage medium |
| CN112575623A (en) * | 2019-09-27 | 2021-03-30 | 比亚迪股份有限公司 | Butt welding plate group, turnout beam and processing method of butt welding plate group |
| CN110834177A (en) * | 2019-10-28 | 2020-02-25 | 中国石油大学(华东) | Method for reducing welding residual stress of large pressure vessel |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107876942A (en) | Normalizing steel submerged-arc welding method for improving low-temperature impact toughness of welded joint | |
| CN104384677B (en) | A kind of super-thick steel plate welding method | |
| CN107042352B (en) | Obliquity vertical gas-electric welding method | |
| CN105252122A (en) | Welding method for high-performance weather-resistant steel which is at Q345qENH-Q420qENH level and used for bridges | |
| CN105583506A (en) | Welding process for high-performance steel | |
| CN103341695A (en) | Method for improving mechanical property of hardened and tempered low-alloy high-strength steel GMAW connector | |
| CN104801922A (en) | Method for repairing fractured roller way spindle nose | |
| CN102049599A (en) | Submerged-arc welding method for ultrahigh-strength steel plate F460Z for ocean structure | |
| CN110666299A (en) | 810 MPa-grade high-performance weather-resistant bridge steel composite welding butt joint method | |
| CN104760351A (en) | Carbon steel and austenitic stainless steel combined steel plate and production method thereof | |
| CN105234527A (en) | Method for performing stainless steel strip-electrode submerged-arc build-up welding on low-alloy parent steel | |
| CN108856992A (en) | A kind of high heat-input double wire hidden arc welding high-efficiency welding method | |
| CN102642067A (en) | Welding method of low-magnetic steel | |
| CN103350287B (en) | F92 valve body and F22 join the technique of pipe dissimilar steel jam welding | |
| EP2883643B1 (en) | Submerged arc welding method | |
| CN102764961B (en) | Technique for manufacturing 150-400mm thick carbon constructional steel plate by using continuous casting slabs | |
| CN103084718B (en) | Welding method for 10CrMo9-10 steel | |
| CN110449698A (en) | A kind of 6-16mm welding method for steel plates | |
| CN107876941A (en) | Steel plate buried arc welding method | |
| CN104070271A (en) | Dissimilar steel welding method of 15 Cr1Mo1V valve body and WB 36 piping | |
| CN104625358B (en) | Abrasion resistant steel and low-carbon steel dissimilar metal submerged-arc welding technology | |
| CN106111717A (en) | A kind of aluminium alloy extrusion mould splits the restorative procedure of bridge and the mould of reparation thereof | |
| CN105643061B (en) | For the CO of superhigh intensity steel plate2The welding method of gas shielded arc welding | |
| CN109530883A (en) | A kind of stainless steel 310S welding procedure | |
| CN110871312A (en) | MAG welding method of low-alloy steel plate with yield strength of 600MPa |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20180406 |
|
| RJ01 | Rejection of invention patent application after publication |