CN102107312B - Butt welding and T-shaped welding construction method for thick steel plate in normal temperature state - Google Patents
Butt welding and T-shaped welding construction method for thick steel plate in normal temperature state Download PDFInfo
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Abstract
The invention discloses a butt welding and T-shaped welding construction method for a thick steel plate in a normal temperature state, which sequentially comprises the following steps of: preheating the thick steel plate to be cut, wherein an inclined angle of 10 degrees is formed between a cutting torch and the surface of the thick steel plate; cutting the thick steel plate into dimension meeting the requirement by employing a liquefied petroleum gas cutting process to obtain a web plate or a flange plate; during cutting, making the cutting torch vertical to the surface of the thick steel plate, making the cutting airflow length 1/2 of the thickness of the thick steel plate, and correspondingly processing a groove of the web plate or the flange plate; and finally, performing butt welding or T-shaped welding treatment on the web plate or the flange plate. The method is convenient to operate and can effectively avoid welding cracks, welding deformation and other defects in the process of welding the thick steel plate.
Description
Technical field:
The present invention relates generally to a kind of welding procedure method, relates in particular to a kind of docking welding and T-shaped welding procedure method of thick steel plate in normal temperature state.
Background technology:
Along with the fast development of Building Trade in China, architectural image becomes increasingly complex, and version is more and more novel, and steel construction application under construction is also more and more frequent.The buildings such as the different stadiums of large quantities of forms of particularly building up in recent years, conference and exhibition center, airport building have nearly all adopted various forms of steel constructions.Because the needs of building and structure, many new models have all appearred in the member of steel construction and node, make for construction and have brought many new problems.
The welding of Guangzhou New Baiyun International Airport steel plate (125mm).Baiyun Airport in Guangzhou connecting bridge steel construction has adopted 90,100 in a large number, the full penetration H steel of 125mm thickness, the material of this steel is the A572Grade50 that meets U.S. ASTM standard, the steel solderability is general, easily cracks and larger welding deformation.Therefore how to guarantee in the welding process of steel plate, prevent the crackle that causes owing to welding and reduce difficult point and the emphasis that welding deformation is this technique.
Summary of the invention:
The object of the invention is exactly in order to remedy the defective of prior art, and a kind of docking welding and T-shaped welding procedure method of thick steel plate in normal temperature state is provided, and it is easy to operate, the welding deformation that can reduce to cause in the welding process.
The present invention is achieved by the following technical solutions:
The docking welding construction method of thick steel plate in normal temperature state is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 8-12 ° of inclination angle with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web or flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), the banjo fixing butt jointing place of web or the banjo fixing butt jointing place of flange plate are opened upper double-U-shaped groove;
(3), the ultrasonic examination internal defects is adopted at the position of the double-U-shaped groove on web or the flange plate and double-U-shaped bevelled edge 80-120mm, crackle and dreg defect that liquefied petroleum gas cutting technique causes are processed, simultaneously, clean double-U-shaped groove polishing;
(4), the web after will processing or flange plate docking location, be positioned at welding bead both sides 80-120mm scope at mother metal, every 400-600mm an electric furnace plate be set, to the mother metal homogeneous heating to 90-110 ℃, stopped heating 8-12min continues to be heated to 150-180 ℃ again;
(5), the web after the above-mentioned heat treated or flange plate are welded, concrete steps are: weld first 1/3 of positive groove depth, then the web after the upset docking or flange plate and it is adopted the carbon arc air gouging back chipping after, use grinder buffing, remove carburized layer and slag, until adopt pyromagnetic powder defectoscopy to carry out the MT flaw detection of bottom after exposing metallic luster, after the free from flaw to be determined, carry out the welding of reverse side weld seam; Web or flange plate after upset is docked again after being soldered, all the other 2/3 welding beads that welding is positive are until finish cosmetic welding; After cosmetic welding finishes, the position of weld seam and weld edge 140-160mm is covered with asbestos cloth, and be heated to 200-300 ℃, insulation 5-6h; Behind the weld seam welding 24h, do the ultrasonic flaw detection check, get final product.
The T shape welding welding procedure method of thick steel plate in normal temperature state is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 8-12 ° of inclination angle with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web and flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), at the T junction place of web and flange plate, the joint area on the web is opened upper two-sided half U-shaped groove;
(3), the two-sided half U-shaped groove on the web and the position of two-sided half U-shaped bevelled edge 80-120mm are checked, inboard clean with the polishing of web junction to flange plate, and with ultrasonic wave web and flange plate are checked, the crackle that liquefied petroleum gas cutting technique causes is processed;
(4), web and flange plate group are stood and are adjusted to the ship shape position, be positioned at welding bead both sides 80-120mm scope at mother metal, every 400-600mm an electric furnace plate be set, to the mother metal homogeneous heating to 90-110 ℃, stopped heating 8-12min continues to be heated to 150-180 ℃ again;
(5), adopt Lincoln weld to weld to the web after the above-mentioned processing and flange plate, and adopt the multiple tracks block welding sequence: be soldered first the left side groove depth 1/4 after, stand up 1/4 of weldering right side groove depth, stand up again and be soldered 1/2 of left side groove depth, circulate repeatedly, until be welded to the weld bead height of requirement;
(6), postwelding carries out after heat and insulation is processed, get final product.
The docking welding construction method of described thick steel plate in normal temperature state is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web or flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), the banjo fixing butt jointing place of web or the banjo fixing butt jointing place of flange plate are opened upper double-U-shaped groove;
(3), the ultrasonic examination internal defects is adopted at the position of the double-U-shaped groove on web or the flange plate and double-U-shaped bevelled edge 100mm, crackle and dreg defect that liquefied petroleum gas cutting technique causes are processed, simultaneously, clean double-U-shaped groove polishing;
(4), the web after will processing or flange plate docking location, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again;
(5), the web after the above-mentioned heat treated or flange plate are welded, concrete steps are: weld first 1/3 of positive groove depth, then the web after the upset docking or flange plate and it is adopted the carbon arc air gouging back chipping after, use grinder buffing, remove carburized layer and slag, until adopt pyromagnetic powder defectoscopy to carry out the MT flaw detection of bottom after exposing metallic luster, after the free from flaw to be determined, carry out the welding of reverse side weld seam; Web or flange plate after upset is docked again after being soldered, all the other 2/3 welding beads that welding is positive are until finish cosmetic welding; After cosmetic welding finishes, the position of weld seam and weld edge 150mm is covered with asbestos cloth, and be heated to 250 ℃, insulation 5h; Behind the weld seam welding 24h, do the ultrasonic flaw detection check, get final product.
The T shape welding welding procedure method of described thick steel plate in normal temperature state is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web and flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), at the T junction place of web and flange plate, the joint area on the web is opened upper two-sided half U-shaped groove;
(3), the two-sided half U-shaped groove on the web and the position of two-sided half U-shaped bevelled edge 100mm are checked, inboard clean with the polishing of web junction to flange plate, and with ultrasonic wave web and flange plate are checked, the crackle that liquefied petroleum gas cutting technique causes is processed;
(4), web and flange plate group is vertical and be adjusted to the ship shape position, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again;
(5), adopt Lincoln weld to weld to the web after the above-mentioned processing and flange plate, and adopt the multiple tracks block welding sequence: be soldered first the left side groove depth 1/4 after, stand up 1/4 of weldering right side groove depth, stand up again and be soldered 1/2 of left side groove depth, circulate repeatedly, until be welded to the weld bead height of requirement;
(6), postwelding carries out after heat and insulation is processed, get final product.
The docking welding construction method of described thick steel plate in normal temperature state, it is characterized in that: the point for measuring temperature on the described mother metal is arranged on welding bead both sides 100mm edge.
The T shape welding welding procedure method of described thick steel plate in normal temperature state, it is characterized in that: after welding is finished, carrying out visual examination of weld confirms, after qualified, with homogeneous heating in the 150mm scope of electric furnace plate butt welded seam both sides to 250-300 ℃, then with the asbestos cloth insulation of wrapping, insulation 5h recession is except protection; Postwelding 24h carries out Ultrasonic Nondestructive.
The docking welding of flange plate or web includes 50mm, 70mm, 90mm, 100mm and five kinds of thickness of 125mm.The welding of the T shape of web and flange plate comprises 50/90,50/100 and 70/,125 3 kind of Type of Welding, and material is the A572Grade50 that meets U.S. ASTM standard.
The docking bevel for welding of flange plate or web is selected the double-U groove that the weld seam loading is few, be convenient to back root cleaning and abrasive machine polishing.Lincoln weld is adopted in welding, and docking only allows the length direction docking.Do not allow the width docking.
The T junction of web and flange plate is opened two-sided half U-shaped groove at the web place, groove adopts the double housing planer planing to form.The T junction of web and flange plate adopts hydraulic pressure gate-type automatic assembling machine to assemble.
After web and flange plate group are vertical, be adjusted to the ship shape position at jig frame special, adopt Lincoln weld to weld.
During the steel plate cutting, done comparative test to adopting autogenous cutting and liquefied petroleum lancing, result of the test shows: it is longer that preheating time is compared in the cutting of liquefied petroleum lancing and acetylene gas, cutting speed is slower, but cut surface is smooth, not carburizing, cost descends more than 15%, both economical safety, therefore final definite liquefied petroleum gas that adopts carries out the steel plate cutting, and cutting parameter sees Table 1.
Table 1 cutting parameter
The liquefied petroleum gas cutting technique requires:
It is large that preheat flame when 1) steel plate cuts is wanted, and cutting steam length selects slightly to be longer than 1/2 of thickness of slab.Cutting torch becomes 10 ° of inclination angles during preheating with surface of the work, prevents from cutting the slag bounce-back and stops up the cutting torch hole.
2) cutting torch is confirmed before the mobile cutting that whole thickness of slab all cuts open to wear perpendicular to surface of the work during gas cutting, and speed is slow before the gas cutting termination, guarantees kerf quality.
Flange plate or web to giveing a thorough inspection in groove and the bevelled edge 100mm scope, and adopt the ultrasonic examination internal flaw before docking.The defectives such as the crackle that gas cutting is caused, slag inclusion are in time processed, and are clean the groove polishing simultaneously.
Behind flange plate or the web docking location, mother metal in the 100mm scope of welding bead both sides arranges one of electric furnace plate (2.0kW) every 500mm, about homogeneous heating to 100 ℃, stopped heating 10min, being beneficial to heat transmits to the plate center, then continue to be heated to 150-180 ℃, point for measuring temperature is arranged on welding bead both sides 100mm edge.
During flange plate or web docking welding, backing welding adopts manual electric arc welding, and intermediate layer and capping layer adopt Lincoln weld, controls interlayer temperature well.Staying root face 6mm in flange plate or the web groove welding, mainly is in order to prevent burn-through.
In the butt-welded welding process of flange plate or web, the windproof and Insulation of strict guarantee.Add a cover immediately the asbestos cloth insulation after the welding bead welding, prevent that weld seam from cooling off fast at short notice and crack.
In the T shape welding process of web and flange plate welding wire centering tracking means should be set, guarantee the welding position, guarantee the center, molten bath, eliminate the distortion that produces because the welding position is asymmetric.
The T shape postwelding of web and flange plate carries out after heat and insulation is processed.Eliminating or the minimizing residual stress, is to prevent crackle, reduces the key of welding deformation.After welding is finished, carry out visual examination of weld and confirm, use immediately after qualified in the 150mm scope of electric furnace plate butt welded seam both sides homogeneous heating to 250-00 ℃, then with the asbestos cloth insulation of wrapping, insulation 5h recession is except protecting.Postwelding 24h carries out Ultrasonic Nondestructive.
Advantage of the present invention is:
The inventive method is easy to operate, can effectively avoid the defectives such as the weld crack that occurs in welding steel plate process and welding deformation.
The specific embodiment:
Embodiment one:
The docking welding construction method of thick steel plate in normal temperature state, carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web or flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness.
(2), the banjo fixing butt jointing place of web or the banjo fixing butt jointing place of flange plate are opened upper double-U-shaped groove.
(3), the ultrasonic examination internal defects is adopted at the position of the double-U-shaped groove on web or the flange plate and double-U-shaped bevelled edge 100mm, crackle and dreg defect that liquefied petroleum gas cutting technique causes are processed, simultaneously, clean double-U-shaped groove polishing.
(4), the web after will processing or flange plate docking location, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again.
(5), the web after the above-mentioned heat treated or flange plate are welded, concrete steps are: weld first 1/3 of positive groove depth, then the web after the upset docking or flange plate and it is adopted the carbon arc air gouging back chipping after, use grinder buffing, remove carburized layer and slag, until adopt pyromagnetic powder defectoscopy to carry out the MT flaw detection of bottom after exposing metallic luster, after the free from flaw to be determined, carry out the welding of reverse side weld seam; Web or flange plate after upset is docked again after being soldered, all the other 2/3 welding beads that welding is positive are until finish cosmetic welding; After cosmetic welding finishes, the position of weld seam and weld edge 150mm is covered with asbestos cloth, and be heated to 250 ℃, insulation 5h; Behind the weld seam welding 24h, do the ultrasonic flaw detection check, get final product.
Embodiment two:
The T shape welding welding procedure method of thick steel plate in normal temperature state, carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web and flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness.
(2), at the T junction place of web and flange plate, the joint area on the web is opened upper two-sided half U-shaped groove.
(3), the two-sided half U-shaped groove on the web and the position of two-sided half U-shaped bevelled edge 100mm are checked, inboard clean with the polishing of web junction to flange plate, and with ultrasonic wave web and flange plate are checked, the crackle that liquefied petroleum gas cutting technique causes is processed.
(4), web and flange plate group is vertical and be adjusted to the ship shape position, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again.
(5), adopt Lincoln weld to weld to the web after the above-mentioned processing and flange plate, and adopt the multiple tracks block welding sequence: be soldered first the left side groove depth 1/4 after, stand up 1/4 of weldering right side groove depth, stand up again and be soldered 1/2 of left side groove depth, circulate repeatedly, until be welded to the weld bead height of requirement.
(6), after welding finishes, carry out visual examination of weld and confirm, qualified after, to 250-300 ℃, then with the asbestos cloth insulation of wrapping, insulation 5h recession is except protecting with homogeneous heating in the 150mm scope of electric furnace plate butt welded seam both sides; Postwelding 24h carries out Ultrasonic Nondestructive.
Claims (6)
1. construction method is welded in the docking of thick steel plate in normal temperature state, it is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 8-12 ° of inclination angle with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web or flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), the banjo fixing butt jointing place of web or the banjo fixing butt jointing place of flange plate are opened upper double-U-shaped groove;
(3), the ultrasonic examination internal defects is adopted at the position of the double-U-shaped groove on web or the flange plate and double-U-shaped bevelled edge 80-120 mm, crackle and dreg defect that liquefied petroleum gas cutting technique causes are processed, simultaneously, clean double-U-shaped groove polishing;
(4), the web after will processing or flange plate docking location, be positioned at welding bead both sides 120mm scope at mother metal, every 400-600mm an electric furnace plate be set, to the mother metal homogeneous heating to 90-110 ℃, stopped heating 8-12min continues to be heated to 150-180 ℃ again;
(5), the web after the above-mentioned heat treated or flange plate are welded, concrete steps are: weld first 1/3 of positive groove depth, then the web after the upset docking or flange plate and it is adopted the carbon arc air gouging back chipping after, use grinder buffing, remove carburized layer and slag, until adopt pyromagnetic powder defectoscopy to carry out the MT flaw detection of bottom after exposing metallic luster, after the free from flaw to be determined, carry out the welding of reverse side weld seam; Web or flange plate after upset is docked again after being soldered, all the other 2/3 welding beads that welding is positive are until finish cosmetic welding; After cosmetic welding finishes, the position of weld seam and weld edge 140-160mm is covered with asbestos cloth, and be heated to 200-300 ℃, insulation 5-6h; Behind the weld seam welding 24h, do the ultrasonic flaw detection check, get final product.
2. construction method is welded in the docking of thick steel plate in normal temperature state according to claim 1, it is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web or flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), the banjo fixing butt jointing place of web or the banjo fixing butt jointing place of flange plate are opened upper double-U-shaped groove;
(3), the ultrasonic examination internal defects is adopted at the position of the double-U-shaped groove on web or the flange plate and double-U-shaped bevelled edge 100mm, crackle and dreg defect that liquefied petroleum gas cutting technique causes are processed, simultaneously, clean double-U-shaped groove polishing;
(4), the web after will processing or flange plate docking location, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again;
(5), the web after the above-mentioned heat treated or flange plate are welded, concrete steps are: weld first 1/3 of positive groove depth, then the web after the upset docking or flange plate and it is adopted the carbon arc air gouging back chipping after, use grinder buffing, remove carburized layer and slag, until adopt pyromagnetic powder defectoscopy to carry out the MT flaw detection of bottom after exposing metallic luster, after the free from flaw to be determined, carry out the welding of reverse side weld seam; Web or flange plate after upset is docked again after being soldered, all the other 2/3 welding beads that welding is positive are until finish cosmetic welding; After cosmetic welding finishes, the position of weld seam and weld edge 150mm is covered with asbestos cloth, and be heated to 250 ℃, insulation 5h; Behind the weld seam welding 24h, do the ultrasonic flaw detection check, get final product.
3. construction method is welded in the docking of thick steel plate in normal temperature state according to claim 1, it is characterized in that:
Point for measuring temperature on the described mother metal is arranged on welding bead both sides 100mm edge.
4. the T shape welding procedure method of thick steel plate in normal temperature state is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 8-12 ° of inclination angle with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web and flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), at the T junction place of web and flange plate, the joint area on the web is opened upper two-sided half U-shaped groove;
(3), the two-sided half U-shaped groove on the web and the position of two-sided half U-shaped bevelled edge 80-120mm are checked, inboard clean with the polishing of web junction to flange plate, and with ultrasonic wave web and flange plate are checked, the crackle that liquefied petroleum gas cutting technique causes is processed;
(4), web and flange plate group are stood and are adjusted to the ship shape position, be positioned at welding bead both sides 120mm scope at mother metal, every 400-600mm an electric furnace plate be set, to the mother metal homogeneous heating to 90-110 ℃, stopped heating 8-12min continues to be heated to 150-180 ℃ again;
(5), adopt Lincoln weld to weld to the web after the above-mentioned processing and flange plate, and adopt the multiple tracks block welding sequence: be soldered first the left side groove depth 1/4 after, stand up 1/4 of weldering right side groove depth, stand up again and be soldered 1/2 of left side groove depth, circulate repeatedly, until be welded to the weld bead height of requirement;
(6), postwelding carries out after heat and insulation is processed, get final product.
5. the T shape of thick steel plate in normal temperature state according to claim 4 is welded the welding procedure method, it is characterized in that: carry out according to the following steps successively:
(1), make steel plate: steel plate to be cut is carried out the pre-heat treatment, and cutting torch becomes 10 ° of inclination angles with the steel plate surface during preheating, adopts the liquefied petroleum gas cutting technique that steel plate is cut into satisfactory size again, obtains web and flange plate; During cutting, cutting torch is perpendicular to the steel plate surface, and cutting steam length is 1/2 of steel plate thickness;
(2), at the T junction place of web and flange plate, the joint area on the web is opened upper two-sided half U-shaped groove;
(3), the two-sided half U-shaped groove on the web and the position of two-sided half U-shaped bevelled edge 100mm are checked, inboard clean with the polishing of web junction to flange plate, and with ultrasonic wave web and flange plate are checked, the crackle that liquefied petroleum gas cutting technique causes is processed;
(4), web and flange plate group is vertical and be adjusted to the ship shape position, be positioned at welding bead both sides 100mm scope at mother metal, every 500mm an electric furnace plate is set, to mother metal homogeneous heating to 100 ℃, stopped heating 10min continues to be heated to 160 ℃ again;
(5), adopt Lincoln weld to weld to the web after the above-mentioned processing and flange plate, and adopt the multiple tracks block welding sequence: be soldered first the left side groove depth 1/4 after, stand up 1/4 of weldering right side groove depth, stand up again and be soldered 1/2 of left side groove depth, circulate repeatedly, until be welded to the weld bead height of requirement;
(6), postwelding carries out after heat and insulation is processed, get final product.
6. the T shape of thick steel plate in normal temperature state according to claim 4 is welded the welding procedure method, it is characterized in that: after welding is finished, carrying out visual examination of weld confirms, after qualified, with homogeneous heating in the 150mm scope of electric furnace plate butt welded seam both sides to 250-300 ℃, then with the asbestos cloth insulation of wrapping, insulation 5h recession is except protection; Postwelding 24h carries out Ultrasonic Nondestructive.
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| CN103128427B (en) * | 2011-12-01 | 2016-01-20 | 安徽跨宇钢结构网架工程有限公司 | A kind of welding procedure method of large cast steel node under low-temperature condition |
| CN102632316A (en) * | 2012-03-21 | 2012-08-15 | 包头多维钢构彩板有限公司 | Welding method |
| CN102756227B (en) * | 2012-07-24 | 2014-09-17 | 四川科新机电股份有限公司 | Method for detecting temperature of high-strength Cr-Mo steel double-side welding back gouging groove belt |
| CN103017539B (en) * | 2013-01-15 | 2016-01-20 | 湖北新冶钢有限公司 | The manufacture method of continuous-type furnace and fire door and this fire door |
| 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 |
| CN115647503A (en) * | 2022-12-26 | 2023-01-31 | 北京坤飞航天科技有限公司 | Welding method and system for T-shaped joint of super-thick steel plate, electronic device and medium |
| CN117226370B (en) * | 2023-11-16 | 2024-03-19 | 中铁建工集团有限公司 | Steel structure overpass truss structure, welding device and welding installation method thereof |
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| JP2000167670A (en) * | 1998-12-08 | 2000-06-20 | Kawasaki Steel Corp | Fillet welding method of high strength thick plate steel |
| JP2004106008A (en) * | 2002-09-18 | 2004-04-08 | Hitachi Constr Mach Co Ltd | Welding joint and welding method thereof |
| CN100548562C (en) * | 2007-12-27 | 2009-10-14 | 中铁四局集团有限公司 | The welding method of 50+120mm slab |
| CN101318254B (en) * | 2008-07-01 | 2011-04-20 | 武汉钢铁(集团)公司 | Thick steel plate buried arc welding method for high-strength bridge |
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