CN102922103A - Submerged arc welding method for K-shaped groove of 80mm extra-thick steel plate with excellent plate shape after welding - Google Patents
Submerged arc welding method for K-shaped groove of 80mm extra-thick steel plate with excellent plate shape after welding Download PDFInfo
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Abstract
The invention discloses a submerged arc welding method for a K-shaped groove of an 80mm extra-thick steel plate with an excellent plate shape after welding. The method comprises the following steps of: taking a K-shaped symmetrical groove machined by machinery as the groove type, wherein a truncated edge is not remained at the root, and the assembling clearance of the groove is 2-3mm; performing backing welding on a front root weld pass of a K-shaped groove test plate by adopting a solid gas shield welding wire during backing welding, so that partial weld metal penetrates through the reverse side of the groove after the root weld pass is penetrated, the backing welding is finished, and employing mixed gas protection of argon and carbon dioxide during welding; performing positive submerged arc welding after backing welding is finished, turning over and performing back chipping while welding to 2/3 depth of the groove, performing reverse submerged arc welding until the reverse welding line is totally filled, and finishing welding of the residual 1/3 depth on the positive side after the welding on the reverse side is completely finished. The method is easy and convenient to operate, the turn-over frequency is reduced, the labor intensity is reduced, the working efficiency is improved, the residual deformation of a soldering block is small, and the welding quality is high.
Description
Technical field
The present invention relates to a kind of welding technique of super-thick steel plate, the 80mm super-thick steel plate K type groove buried arc welding method that a kind of postwelding plate shape is good specifically.
Background technology
Special heavy plate adopts the Lincoln weld welding, both can raise labour efficiency, and reduced labour intensity, improves work situation, economize on resources, and can reduce labour cost again.But the special heavy plate Lincoln weld easily produces pore, crackle, slag inclusion, incomplete fusion, the defect such as lack of penetration.Most important shortcoming is that welding deformation is wayward, and the main cause that causes welding deformation is the welding residual stress caused due to the uneven temperature field of welding generation.The factor that affects welding stress and distortion mainly contains two aspects, and the one, the scope of weld seam and near non-uniform heat flux thereof and degree, namely produce scope and the degree of thermal deformation; The 2nd, the rigidity of weldment itself and the degree of being restrained on every side, be exactly in fact namely the degree that stops weld seam and thermal deformation that near heating produces thereof.The result of two aspect effects has determined near the size in the compressive plastic deformation of weld seam district and has distributed, also determined the size of residual stress and residual deformation.
Because the super-thick steel plate structural rigidity is large, after welding, cooling velocity is fast, and weld seam is subject to larger restraining, so the residual stress that weld seam is subject to is also large, thereby easily produces large deformation, causes the rear plate shape of welding bad.
Chinese Patent Application No. is 201110435335.2, and the patent that publication number is 102554416A has been described a kind of buried arc welding method of asymmetric K type groove slab, but described thickness of slab is only 60mm, and asymmetric K type groove easily produces welding deformation.Chinese Patent Application No. is 201010579763.8, publication number is for having described the buried arc welding method of the thick E36 steel plate of 100mm for the patent of 102000901A, but what adopt is the X-type groove, beveling machine processing is than K type groove complexity, and this patent is directly used the submerged-arc welding bottoming, but root face is too little while directly carrying out the submerged-arc welding bottoming welding of larger heat input burn-through very easily, for the K type groove without root face, more can not be suitable for, and the method for describing by this patent is carried out submerged-arc welding and is at least wanted turnover panel 4 times, and labour intensity is higher.
Summary of the invention
Technical problem to be solved by this invention is, overcome the shortcoming of prior art, characteristics according to super-thick steel plate docking Lincoln weld, for the super-thick steel plate Lincoln weld of 80mm, provide a kind of super-thick steel plate buried arc welding method that can control well welded plate shape.
The technical scheme that the present invention solves above technical problem is:
The 80mm super-thick steel plate K type groove buried arc welding method that a kind of postwelding plate shape is good comprises the following steps:
(i) slope type adopts the symmetrical groove of machining K type, and root does not stay root face, groove fit-up gap 2～3mm;
When (ii) bottoming is welded, adopt solid gas protecting welding wire to carry out the bottoming welding of K type groove test plate (panel) front root pass, after making the root pass penetration, the part weld metal sees through the groove reverse side, complete the bottoming welding, adopt the mixed gas protected of argon gas and carbon dioxide during welding;
(iii) after bottoming has been welded, carry out positive submerged-arc welding, when being soldered to groove 2/3 degree of depth, the turn-over back chipping, then carry out reverse side submerged-arc welding, until the reverse side weld seam all fills up, after reverse side has all welded, then completes the positive welding that remains 1/3 degree of depth.
The technical scheme that the present invention further limits is:
The 80mm super-thick steel plate K type groove buried arc welding method that aforesaid postwelding plate shape is good, step (i) in, the front groove of K type groove and reverse side bevel angle are 45 °～50 °.
The 80mm super-thick steel plate K type groove buried arc welding method that aforesaid postwelding plate shape is good, step (ii) in, described mist is comprised of volume ratio 80% argon gas and 20% carbon dioxide.
The 80mm super-thick steel plate K type groove buried arc welding method that aforesaid postwelding plate shape is good, step (iii) in, described back chipping method is the polishing of carbon arc air gouging or abrasive machine.
The 80mm super-thick steel plate K type groove buried arc welding method that aforesaid postwelding plate shape is good, the submerged-arc welding process parameter is: welding current 450～750A, weldingvoltage 28～32V, speed of welding 28～50cm/min, interlayer temperature<200 ℃.
The invention has the beneficial effects as follows: first face bonding is to 2/3 of groove depth, after being soldered, can produce to positive crooked distortion, turn-over is soldered to the reverse side weld seam and all fills up again, and two effects are arranged: the one, and can produce to the distortion of reverse side bending during the reverse side welding, thereby correct to positive crooked distortion; The reverse side multi-layer multi-pass welding is equivalent to repeatedly spot annealing heat treatment in addition, has reduced the residual stress peak value.Face bonding is to 2/3 of groove depth, and reverse side once all fills up, and reason is the amount of contraction maximum that first welding bead causes, each road reduces gradually later, only has the distortion produced when the reverse side welding bead is more could offset positive welding.
Adopt above-mentioned symmetrical K type groove welding technological measure, the welding quality of 80mm super-thick steel plate is under control, the welding line ultrasonic flaw detection reaches the I level, and welding deformation obtains desirable control, and the mechanical property of welding point meets standard-required.
Welding operation of the present invention is easy, has reduced the turn-over number of times, has reduced labour intensity, has improved operating efficiency, and the welding plate residual deformation obtained is little, and welding quality is high, is applicable to large ocean structure and boats and ships and applies.
The accompanying drawing explanation
Fig. 1 is welding procedure K type slope type of the present invention.
The buried arc welding method that Fig. 2 is is 15kJ/cm with heat input of the present invention is soldered the pattern of rear test plate (panel).
The buried arc welding method that Fig. 3 is is 50kJ/cm with heat input of the present invention is soldered the pattern of rear test plate (panel).
The specific embodiment
Embodiment 1
The present embodiment is the 80mm super-thick steel plate K type groove buried arc welding method that a kind of postwelding plate shape is good, comprises the following steps:
(i) slope type: adopt the symmetrical groove of machining K type, front groove and reverse side groove hypotenuse are 45 °, and root does not stay root face, groove fit-up gap 2mm;
(ii) bottoming welding: during welding, adopt the solid welding wire under pulse current to carry out the bottoming welding of K type groove test plate (panel) front root pass, after making the root pass penetration, the part weld metal sees through the groove reverse side, completes the bottoming welding; Adopt the mixed gas protected of argon gas and carbon dioxide, the mist that the mist that mist is argon gas and carbon dioxide is volume ratio 80% argon gas+20% carbon dioxide during welding;
(iii) after the bottoming welding, with Lincoln weld, carry out the front multi-layer multi-pass welding, while being welded to groove depth 2/3, turn-over; With carbon arc air gouging or abrasive machine to the finishing of polishing of groove reverse side root, thereby reach the purpose of back chipping;
(iv) after back chipping completes, with Lincoln weld, carry out the reverse side multi-layer multi-pass welding, until the reverse side weld seam all fills up; Complete again the welding of positive residue 1/3 degree of depth with Lincoln weld.
The submerged-arc welding process parameter is: welding current 450A, weldingvoltage 28V, speed of welding 50cm/min, interlayer temperature<200 ℃.
Embodiment 2
The present embodiment is the 80mm super-thick steel plate K type groove buried arc welding method that a kind of postwelding plate shape is good, comprises the following steps:
(i) slope type: adopt the symmetrical groove of machining K type, front groove and reverse side groove hypotenuse are 50 °, and root does not stay root face, groove fit-up gap 3mm;
(ii) bottoming welding: during welding, adopt the solid welding wire under pulse current to carry out the bottoming welding of K type groove test plate (panel) front root pass, after making the root pass penetration, the part weld metal sees through the groove reverse side, completes the bottoming welding; Adopt the mixed gas protected of argon gas and carbon dioxide, the mist that the mist that mist is argon gas and carbon dioxide is volume ratio 80% argon gas+20% carbon dioxide during welding;
(iii) after the bottoming welding, with Lincoln weld, carry out the front multi-layer multi-pass welding, while being welded to groove depth 2/3, turn-over; With carbon arc air gouging or abrasive machine to the finishing of polishing of groove reverse side root, thereby reach the purpose of back chipping;
(iv) after back chipping completes, with Lincoln weld, carry out the reverse side multi-layer multi-pass welding, until the reverse side weld seam all fills up; Complete again the welding of positive residue 1/3 degree of depth with Lincoln weld.
The submerged-arc welding process parameter is: welding current 750A, weldingvoltage 32V, speed of welding 28cm/min, interlayer temperature<200 ℃.
The present embodiment 1 and embodiment 2 preferred dimensions are that 900mm(is long) * 250mm(is wide) * 80mm(is thick) the E36 steel plate for ocean engineering spliced submerged-arc welding, respectively with two pairs of test plate (panel)s of heat input splicing welding of 15kJ/cm and 50kJ/cm.Before welding; test plate (panel) is processed symmetrical K type groove by the method for machining; then press the method assembling in Fig. 1; first with argon gas and carbon dioxide gas mixture protection weldering, carry out the bottoming welding; then carry out front groove submerged arc welding; be welded to the rear carbon arc air gouging of groove depth 2/3 or abrasive machine back chipping, after polishing is clean, carry out the reverse side groove welding again, reverse side welds the front remainder after all having welded again.The submerged arc welding parameter is as shown in table 1.
Table 1 submerged-arc welding process parameter
Test plate (panel) after having welded with said method 15kJ/cm and two kinds of heat inputs of 50kJ/cm, Fig. 2 is the pattern that buried arc welding method that heat input is 15kJ/cm is soldered rear test plate (panel), Fig. 3 is the pattern that buried arc welding method that heat input is 50kJ/cm is soldered rear test plate (panel), as seen from the figure, profile is straight, and the welding residual deformation amount is little, after ultrasonic examination, do not find open defect, reach I level level.Welded Joints carries out mechanical properties test, all reaches the nine state classification societies requirements such as DNV, ABS, CCS, has good comprehensive mechanical property.
In addition to the implementation, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (5)
1. the 80mm super-thick steel plate K type groove buried arc welding method that postwelding plate shape is good is characterized in that: comprise the following steps:
(i) slope type adopts the symmetrical groove of machining K type, and root does not stay root face, groove fit-up gap 2～3mm;
When (ii) bottoming is welded, adopt solid gas protecting welding wire to carry out the bottoming welding of K type groove test plate (panel) front root pass, after making the root pass penetration, the part weld metal sees through the groove reverse side, complete the bottoming welding, adopt the mixed gas protected of argon gas and carbon dioxide during welding;
(iii) after bottoming has been welded, carry out positive submerged-arc welding, when being soldered to groove 2/3 degree of depth, the turn-over back chipping, then carry out reverse side submerged-arc welding, until the reverse side weld seam all fills up, after reverse side has all welded, then completes the positive welding that remains 1/3 degree of depth.
2. the 80mm super-thick steel plate K type groove buried arc welding method that postwelding plate shape as claimed in claim 1 is good is characterized in that: described step (i) in, the front groove of K type groove and reverse side bevel angle are 45 °～50 °.
3. the 80mm super-thick steel plate K type groove buried arc welding method that postwelding plate shape as claimed in claim 1 is good is characterized in that: described step (ii) in, described mist is comprised of volume ratio 80% argon gas and 20% carbon dioxide.
4. the 80mm super-thick steel plate K type groove buried arc welding method that postwelding plate shape as claimed in claim 1 is good is characterized in that: described step (iii) in, described back chipping method is the polishing of carbon arc air gouging or abrasive machine.
5. the 80mm super-thick steel plate K type groove buried arc welding method that postwelding plate shape as claimed in claim 1 is good, it is characterized in that: the submerged-arc welding process parameter is: welding current 450～750A, weldingvoltage 28～32V, speed of welding 28～50cm/min, interlayer temperature<200 ℃.
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| CN103286527A (en) * | 2013-03-29 | 2013-09-11 | 常州钢劲型钢有限公司 | Production process for extra-large aperture super wall thickness square steel pipe |
| CN104002023A (en) * | 2014-05-29 | 2014-08-27 | 南通中远重工有限公司 | Welding process special for thick dissimilar material plate |
| CN104259635A (en) * | 2014-07-30 | 2015-01-07 | 南京钢铁股份有限公司 | Submerged arc welding technology for backing-weld-free connection of K-type groove |
| CN104384670A (en) * | 2014-09-30 | 2015-03-04 | 山东钢铁股份有限公司 | Welding method for steel plate of ocean platform |
| 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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| CN105269163A (en) * | 2014-06-11 | 2016-01-27 | 中建钢构有限公司 | Anti-deformation mounting method of steel plate shear wall in high-rise steel structure |
| CN105414784A (en) * | 2015-12-09 | 2016-03-23 | 福建省马尾造船股份有限公司 | Round steel butt welding technique |
| CN105880815A (en) * | 2016-06-15 | 2016-08-24 | 通号轨道车辆有限公司 | Tube plate angle joint aided welding device and welding method |
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| CN107866624A (en) * | 2016-09-22 | 2018-04-03 | 唐山开元机器人系统有限公司 | Cut deal K-type groove exempts from back chipping full penetration（I level components）Robot welding technique |
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| CN103286527A (en) * | 2013-03-29 | 2013-09-11 | 常州钢劲型钢有限公司 | Production process for extra-large aperture super wall thickness square steel pipe |
| CN104002023A (en) * | 2014-05-29 | 2014-08-27 | 南通中远重工有限公司 | Welding process special for thick dissimilar material plate |
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| CN105269163A (en) * | 2014-06-11 | 2016-01-27 | 中建钢构有限公司 | Anti-deformation mounting method of steel plate shear wall in high-rise steel structure |
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| CN104384670B (en) * | 2014-09-30 | 2016-04-27 | 山东钢铁股份有限公司 | A kind of offshore platform steel plate welding method |
| CN104384670A (en) * | 2014-09-30 | 2015-03-04 | 山东钢铁股份有限公司 | Welding method for steel plate of ocean platform |
| 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 |
| CN104923893B (en) * | 2015-06-25 | 2017-04-19 | 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 |
| CN112935538A (en) * | 2021-01-25 | 2021-06-11 | 广西建工集团第一安装有限公司 | Efficient welding method for spliced thick plate |
| 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 |
| CN115365607A (en) * | 2022-09-26 | 2022-11-22 | 中国电建集团江西省水电工程局有限公司 | Welding device and welding method for thick plate T-shaped joint |
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Application publication date: 20130213 |