CN104209625A - Q460 steel thick plate welding process - Google Patents
Q460 steel thick plate welding process Download PDFInfo
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- CN104209625A CN104209625A CN201410471836.XA CN201410471836A CN104209625A CN 104209625 A CN104209625 A CN 104209625A CN 201410471836 A CN201410471836 A CN 201410471836A CN 104209625 A CN104209625 A CN 104209625A
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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
- B23K9/02—Seam welding; Backing means; Inserts
- B23K9/025—Seam welding; Backing means; Inserts for rectilinear seams
-
- 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
-
- 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
- B23K9/013—Arc cutting, gouging, scarfing or desurfacing
-
- 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
- B23K9/16—Arc welding or cutting making use of shielding gas
-
- 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
- B23K9/235—Preliminary treatment
-
- 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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
- B23K2101/185—Tailored blanks
-
- 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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Abstract
The invention discloses a Q460 steel thick plate welding process, which comprises the following steps that the top end and the bottom end of the side surface of a Q460 steel workpiece to be welded are cut, so that two workpieces are in butt joint for forming two asymmetric double-V-shaped grooves; the ground workpieces are subjected to pairing welding; welding seam regions are preheated; the preheated workpieces are subjected to priming layer, filling layer and cover surface layer welding by a multilayer multi-pass and narrow-gap thin layer welding method; carbon arc air gouging is adopted for back chipping processing, and back defects can be totally chipped in the back chipping process. The Q460 steel thick plate welding process disclosed by the invention has the advantages that the welding quality of a Q460 steel thick plate is improved, and the generation of welding stress and welding deformation is reduced.
Description
Technical field
The present invention relates to welding procedure control technology field, particularly relate to a kind of welding procedure of Q460 steel thick plate.
Background technology
Q460GJC steel belongs to low-alloy high-strength high building structure steel, is widely used in skyscraper.Compared with common low-alloy high-strength steel, this steel grade has that carbon equivalent is high, tendency of hardenability is large, preheating and interlayer temperature control overflow high, and more easily produce the defects such as weld crack, and Q460GJC steel thick plate is in welding process, as improper in welding procedure control, be very easy to produce large welding stress and welding deformation.Therefore, select best welding condition, formulate rational technical requirement, effectively to eliminate weld defect, thus obtain the emphasis that high-quality weld seam and stable Welding Structure are the welding of Q460GJC steel thick plate.
Summary of the invention
Main purpose of the present invention is the welding procedure providing a kind of Q460 steel thick plate, is intended to the welding quality improving Q460 steel thick plate, reduces the generation of welding stress and welding deformation.
For achieving the above object, the invention provides a kind of welding procedure of Q460 steel thick plate, comprise the following steps:
Cut on the top, side of the workpiece of Q460 steel to be welded and bottom, make the asymmetric double V-shaped groove of two workpiece docking formation two, the angle of bevel of described workpiece is 20 ~ 22 °, and polishes to the groove after cutting;
Welding is grouping to the workpiece after polishing;
Carry out preheating to the welded seam area of the workpiece after welding, adopt the method for crawler type electric heater heating or fire endurance period heating during preheating, heating-up temperature is 100 ~ 150 DEG C;
The method of multilayer multiple tracks, narrow gap thin layer weldering is adopted to carry out the welding of prime coat, packed layer and capping layer to the workpiece after preheating;
Adopt carbon arc air gouging to carry out back chipping process to workpiece, root defect all removed in the process of back chipping, and polishing makes channeling rounding off, back chipping Current Control is 500 ~ 550A.
Preferably, the step that the described method adopting multilayer multiple tracks, narrow gap thin layer to weld to the workpiece after preheating carries out the welding of prime coat, packed layer and capping layer specifically comprises:
The gap of the little groove of first welding work pieces, welding 3 ~ 4 road prime coats after, according to the deformation turn-over back chipping of described workpiece, then by large groove welding to large groove thickness 3/5 time, after turn-over is full by disposable for the gap of little groove weldering, turn-over is carried out to described workpiece and the gap of large groove is once welded full.
Preferably, described employing carbon arc air gouging carries out back chipping process, root defect is all removed in the process of back chipping, and polishing also comprises after making the step of channeling rounding off:
When the weld seam of described workpiece has not once welded continuously, after the slow cooling to normal temperature of weld seam covering and heat insulating cotton-wadded quilt, re-start preheating, preheat temperature has been 100 ~ 150 DEG C, and again welds, after having welded, by the slow cooling of weld seam covering and heat insulating cotton-wadded quilt to normal temperature.
Preferably, the method for multilayer multiple tracks, narrow gap thin layer weldering is adopted to carry out in the step of the welding of prime coat, packed layer and capping layer to the workpiece after preheating,
The technological parameter of prime coat is: welding current is 200 ~ 220A, and arc voltage is 24 ~ 26V, and speed of welding is 16 ~ 20cm/min, and nozzle diameter is 20mm, and tip to workpiece spacing is 10 ~ 15mm, CO
2gas flow is 15 ~ 25L/min;
The technological parameter of packed layer and capping layer is: welding current is 240 ~ 260A, and arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 24cm/min, and nozzle diameter is 20mm, and tip is 15 ~ 20mm, CO to the spacing of workpiece
2gas flow is 15 ~ 25L/min.
Preferably, the method of multilayer multiple tracks, narrow gap thin layer weldering is adopted to carry out in the step of prime coat, filling and cover welding to the workpiece after preheating, the amplitude of fluctuation controlling welding gun is less than or equal to 20mm, welding gun and workpiece angle are ± 30 °, the thickness of prime coat is 4 ~ 6mm, the single-pass welding thickness of packed layer and capping layer is all less than or equal to 4mm, and control temperature between welding bead is 100 ~ 200 DEG C simultaneously.
Preferably, described employing carbon arc air gouging carries out back chipping process, root defect is all removed in the process of back chipping, and polishing also comprises after making the step of channeling rounding off:
Workpiece weld seam carries out ray or ultrasound examination after welding completes 24h;
When detecting discovery workpiece and there is excessive defect, carbon arc air gouging removal of defects is adopted also to use CO
2gas shielded arc welding carries out repair welding, and same position repair welding number of times is no more than twice.
Preferably, the thickness of the little groove offered at the workpiece of Q460 steel to be welded is the half of the thickness of large groove.
Preferably, butt welded seam region is carried out in the step of preheating, heat in weld seam both sides during heating, width of heating is 100 ~ 120mm, and adopting infrared radiation thermometer to measure heating-up temperature, point for measuring temperature is arranged on each 75mm place, weld seam original edge both sides, during thermometric, infrared radiation thermometer is perpendicular to surface of the work, and the spacing between infrared radiation thermometer and surface of the work is less than or equal to 200mm.
Preferably, when welding, controlling its welding current is 280 ~ 300A, arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 25cm/min, and workpiece grooves gap is 0 ~ 2mm, unfitness of butt controls to be less than or equal to 1mm, and tack weld length is 15 ~ 30mm, and tack weld spacing is 100 ~ 300mm.
The welding procedure of the Q460 steel thick plate that the present invention proposes, asymmetric double V-shaped groove is offered by the top end face of the workpiece at Q460 steel and bottom face, be easy to the control to workpiece deformation on the one hand, on the other hand when carbon arc air gouging back chipping, can reduce waste to mother metal (if because of the groove depth of gouge back chipping side larger time, the mother metal of weld seam both sides and the weld seam welded can be swept off during gouge, thus cause the waste of mother metal).Simultaneously, workpiece adopts the method for multilayer multiple tracks, narrow gap thin layer weldering to carry out the welding of prime coat, packed layer and capping layer, because front road weld seam has heat treated effect to rear road weld seam, therefore multi-layer multi-pass welding can improve weld metal quality, meanwhile, multi-layer multi-pass welding also can improve weld seam Non-Destructive Testing qualification rate.The method weld heat-affected zone of narrow gap thin layer weldering is little, and can improve and increase workpiece performance, the workpiece satisfactory mechanical property after welding, welding residual stress is little, and workpiece deformation is little.In addition, the method for narrow gap thin layer weldering also can reduce weld interval, reduces the use of packing material, can reduce costs, boost productivity.The welding procedure of the Q460 steel thick plate that the present embodiment proposes, take above-mentioned welding parameter to control, make it the welding being best suited for Q460 steel thick plate, significantly reduce welding stress, reduce welding deformation, decrease the generation of weld crack, ensure that the weldquality of Q460 steel thick plate, improve solder yield.Fully meet manufacturability and the usability requirement of high-strength steel.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet of the welding procedure preferred embodiment of Q460 steel thick plate of the present invention;
Fig. 2 is the structural representation of the workpiece of the welding procedure using Q460 steel thick plate of the present invention;
Fig. 3 is the Fundamentals of Welding schematic diagram of the workpiece of the welding procedure using Q460 steel thick plate of the present invention.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Detailed description of the invention
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention proposes a kind of welding procedure of Q460 steel thick plate.
With reference to the schematic flow sheet that Fig. 1, Fig. 1 are the welding procedure preferred embodiment of Q460 steel thick plate of the present invention.
In this preferred embodiment, a kind of welding procedure of Q460 steel thick plate, comprises the following steps:
Step S10, cut on the top, side of the workpiece of Q460 steel to be welded and bottom, make group to after two workpiece docking formation two asymmetric double V-shaped grooves [when workpiece is grouping welding the workpiece group pair of 2 Q460 steel to be welded (time), form asymmetric double V-shaped groove], the angle of bevel of described workpiece is 20 ~ 22 °, and polishes to the groove after cutting;
Step S20, is grouping welding to the workpiece after polishing;
Step S30, preheating is carried out in butt welded seam region, and adopt the method for crawler type electric heater heating or fire endurance period heating during preheating, heating-up temperature is 100 ~ 150 DEG C;
Step S40, adopts the method for multilayer multiple tracks, narrow gap thin layer weldering to carry out the welding of prime coat, packed layer and capping layer to the workpiece (in double V-groove) after preheating;
Step S50, adopt carbon arc air gouging to carry out back chipping process to workpiece, root defect all removed in the process of back chipping, and polishing makes channeling rounding off, back chipping Current Control is 500 ~ 550A.
In the present embodiment, with workpiece model for Q460GJC, thickness of slab is the steel plate of 60mm is that example illustrates.Preparation before welding has following aspect:
Welding equipment and other instruments prepare: CO
2gas shield soldering equipment (model: NBC-350 type) 1, electric angle grinder, wire brush, steel ruler, weld seam chi, heat-preservation cotton etc. needed for workpiece welding;
Welding material prepares: the welding wire CHW-60CS(model that low alloy steel welding wire adopts Zigong Atlantic Welding Wire Co., Ltd. to produce: ER55-D2, specification: diameter phi 1.2mm) 1 volume, CO
2gas (CO2 purity>=99.7%, water content≤0.005%).
In Fig. 2, c represents root face, and c is that 0 ~ 2mm, a1 and a2 are 40 ~ 44 °.Particularly, in step S20, when welding, controlling its welding current is 280 ~ 300A, and arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 25cm/min, (b namely shown in Fig. 2) is 0 ~ 2mm in workpiece grooves gap, unfitness of butt controls to be less than or equal to 1mm, and tack weld length is 15 ~ 30mm, and tack weld spacing is 100 ~ 300mm.In step S50, back chipping uses the specification of circular carbon-point for diameter phi 10mm.Asymmetric double V-shaped groove refers to that the top end face of the workpiece of Q460 steel is not identical with the groove thickness of bottom face.Particularly, in the present embodiment, the thickness of the little groove offered at the workpiece of Q460 steel to be welded is the half of the thickness of large groove.With reference to Fig. 2, semiautomatic flame cutting machine can be used workpiece to be opened 1/ (3t-3c), 1/ (3t-3c) (t is the thickness of steel plate) asymmetric double V-shaped groove, angle of bevel refers to that the angle of 1/ shown in Fig. 2 (2*a1) and 1/ (2*a2), a1 and a2 preferably arranges identical.To the groove polishing after cutting, make it to exposing metallic luster, polishing scope is groove face and each 30mm in both sides thereof.
In step S20, when welding is grouping to workpiece, as tack weld there is the defect such as crackle, pore time, must remove in time and again weld.
Particularly, in conjunction with reference Fig. 2 and Fig. 3, step S40 specifically comprises:
The gap of the little groove (groove of the below namely shown in Fig. 2) of first welding work pieces, after welding 3 ~ 4 road prime coats, according to the deformation turn-over back chipping of described workpiece, when larger groove (groove of the top namely shown in Fig. 2) being welded to 3/5 of large groove thickness, after turn-over is full by disposable for the gap of little groove weldering, turn-over is carried out to described workpiece, then the gap of large groove is once welded full.The sequencing of label representative welding in Fig. 3.In the welding process of step S40, should be noted and observe weld seam end face angle distortion change, adjust turn-over and welding operation at any time according to actual conditions.
In step s 40, the technological parameter of prime coat is: welding current is 200 ~ 220A, and arc voltage is 24 ~ 26V, and speed of welding is 16 ~ 20cm/min, and nozzle diameter is 20mm, and tip to workpiece spacing is 10 ~ 15mm, CO
2gas flow is 15 ~ 25L/min;
The technological parameter of packed layer and capping layer is: welding current is 240 ~ 260A, and arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 24cm/min, and nozzle diameter is 20mm, and tip is 15 ~ 20mm, CO to the spacing of workpiece
2gas flow is 15 ~ 25L/min.
In step s 40, the amplitude of fluctuation controlling welding gun is less than or equal to 20mm, and welding gun and workpiece angle are ± 30 °, and the thickness of prime coat is 4 ~ 6mm, the single-pass welding thickness of packed layer and capping layer is all less than or equal to 4mm, and control temperature between welding bead is 100 ~ 200 DEG C simultaneously.Between welding bead, temperature measures by infrared radiation thermometer.
Further, also comprise after step S50:
When the weld seam of described workpiece has not once welded continuously, after the slow cooling to normal temperature of weld seam covering and heat insulating cotton-wadded quilt, re-start preheating, preheat temperature has been 100 ~ 150 DEG C, and again welds, after having welded, by the slow cooling of weld seam covering and heat insulating cotton-wadded quilt to normal temperature.
In the present embodiment, the slow cooling of butt welded seam covering and heat insulating cotton-wadded quilt, to normal temperature, can reduce the cooling velocity of welding point in low-temperature transformation on the one hand, extends the time of weld seam more than 100 DEG C, the effect that weld metal zone also can be made to be under pressure when solid thermal strain on the other hand, eliminates the mechanics factors such as cold crack.State modulator when again welding is identical with the design parameter in step S40.
Further, also comprise after step S50:
Workpiece weld seam completes 24h(hour in welding) after carry out ray or ultrasound examination;
When detecting discovery workpiece and there is excessive defect, adopt carbon arc air gouging removal of defects and carry out repair welding with CO2 gas shielded arc welding, same position repair welding number of times is no more than twice.
Excessive defect refers to crackle, pore, slag inclusion and incomplete fusion etc.
Particularly, in step s 30, heat in weld seam both sides during heating, width of heating is 100 ~ 120mm, and adopting infrared radiation thermometer to measure heating-up temperature, point for measuring temperature is arranged on each 75mm place, weld seam original edge both sides, during thermometric, infrared radiation thermometer is perpendicular to surface of the work, and the spacing between infrared radiation thermometer and surface of the work is less than or equal to 200mm.Need in heating process to avoid local temperature too high.
The welding procedure of the Q460 steel thick plate that the present embodiment proposes, asymmetric double V-shaped groove is offered by the top end face of the workpiece at Q460 steel and bottom face, be easy to the control to workpiece deformation on the one hand, on the other hand when carbon arc air gouging back chipping, can reduce waste to mother metal (if because of the groove depth of gouge back chipping side larger time, the mother metal of weld seam both sides and the weld seam welded can be swept off during gouge, thus cause the waste of mother metal).Simultaneously, workpiece adopts the method for multilayer multiple tracks, narrow gap thin layer weldering to carry out the welding of prime coat, packed layer and capping layer, because front road weld seam has heat treated effect to rear road weld seam, therefore multi-layer multi-pass welding can improve weld metal quality, meanwhile, multi-layer multi-pass welding also can improve weld seam Non-Destructive Testing qualification rate.And the method butt welded seam heat affected area of narrow gap thin layer weldering is little, can improve and increase workpiece performance, the workpiece satisfactory mechanical property after welding, welding residual stress is little, and workpiece deformation is little.In addition, the method for narrow gap thin layer weldering also can reduce weld interval, reduces the use of packing material, can reduce costs, boost productivity.The welding procedure of the Q460 steel thick plate that the present embodiment proposes, control by taking above-mentioned welding parameter, make it the welding being best suited for Q460 steel thick plate, significantly reduce welding stress, reduce welding deformation, decrease the generation of weld crack, ensure that the weldquality of Q460 steel thick plate, improve solder yield.Fully meet manufacturability and the usability requirement of high-strength steel.
These are only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every equivalent structure transformation utilizing description of the present invention and accompanying drawing content to do, or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (9)
1. a welding procedure for Q460 steel thick plate, is characterized in that, comprises the following steps:
Cut on the top, side of the workpiece of Q460 steel to be welded and bottom, make the asymmetric double V-shaped groove of two workpiece docking formation two, the angle of bevel of described workpiece is 20 ~ 22 °, and polishes to the groove after cutting;
Welding is grouping to the workpiece after polishing;
Carry out preheating to the welded seam area of the workpiece after welding, adopt the method for crawler type electric heater heating or fire endurance period heating during preheating, heating-up temperature is 100 ~ 150 DEG C;
The method of multilayer multiple tracks, narrow gap thin layer weldering is adopted to carry out the welding of prime coat, packed layer and capping layer to the workpiece after preheating;
Adopt carbon arc air gouging to carry out back chipping process to workpiece, root defect all removed in the process of back chipping, and polishing makes channeling rounding off, back chipping Current Control is 500 ~ 550A.
2. the welding procedure of Q460 steel thick plate as claimed in claim 1, is characterized in that, the step that the described method adopting multilayer multiple tracks, narrow gap thin layer to weld to the workpiece after preheating carries out the welding of prime coat, packed layer and capping layer specifically comprises:
The gap of the little groove of first welding work pieces, welding 3 ~ 4 road prime coats after, according to the deformation turn-over back chipping of described workpiece, then by large groove welding to large groove thickness 3/5 time, after turn-over is full by disposable for the gap of little groove weldering, turn-over is carried out to described workpiece and the gap of large groove is once welded full.
3. the welding procedure of Q460 steel thick plate as claimed in claim 1, it is characterized in that, described employing carbon arc air gouging carries out back chipping process, root defect is all removed in the process of back chipping, and polishing also comprises after making the step of channeling rounding off:
When the weld seam of described workpiece has not once welded continuously, after the slow cooling to normal temperature of weld seam covering and heat insulating cotton-wadded quilt, re-start preheating, preheat temperature has been 100 ~ 150 DEG C, and again welds, after having welded, by the slow cooling of weld seam covering and heat insulating cotton-wadded quilt to normal temperature.
4. the welding procedure of Q460 steel thick plate as claimed in claim 3, is characterized in that, adopts the method for multilayer multiple tracks, narrow gap thin layer weldering to carry out in the step of the welding of prime coat, packed layer and capping layer to the workpiece after preheating,
The technological parameter of prime coat is: welding current is 200 ~ 220A, and arc voltage is 24 ~ 26V, and speed of welding is 16 ~ 20cm/min, and nozzle diameter is 20mm, and tip to workpiece spacing is 10 ~ 15mm, CO
2gas flow is 15 ~ 25L/min;
The technological parameter of packed layer and capping layer is: welding current is 240 ~ 260A, and arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 24cm/min, and nozzle diameter is 20mm, and tip is 15 ~ 20mm, CO to the spacing of workpiece
2gas flow is 15 ~ 25L/min.
5. the welding procedure of Q460 steel thick plate as claimed in claim 4, it is characterized in that, the method of multilayer multiple tracks, narrow gap thin layer weldering is adopted to carry out in the step of prime coat, filling and cover welding to the workpiece after preheating, the amplitude of fluctuation controlling welding gun is less than or equal to 20mm, welding gun and workpiece angle are ± 30 °, the thickness of prime coat is 4 ~ 6mm, and the single-pass welding thickness of packed layer and capping layer is all less than or equal to 4mm, and control temperature between welding bead is 100 ~ 200 DEG C simultaneously.
6. the welding procedure of Q460 steel thick plate as claimed in claim 5, it is characterized in that, described employing carbon arc air gouging carries out back chipping process, root defect is all removed in the process of back chipping, and polishing also comprises after making the step of channeling rounding off:
Workpiece weld seam carries out ray or ultrasound examination after welding completes 24h;
When detecting discovery workpiece and there is excessive defect, carbon arc air gouging removal of defects is adopted also to use CO
2gas shielded arc welding carries out repair welding, and same position repair welding number of times is no more than twice.
7. the welding procedure of Q460 steel thick plate as claimed in claim 1, is characterized in that, the thickness of the little groove offered at the workpiece of Q460 steel to be welded is the half of the thickness of large groove.
8. the welding procedure of Q460 steel thick plate as claimed in any of claims 1 to 7 in one of claims, it is characterized in that, butt welded seam region is carried out in the step of preheating, heat in weld seam both sides during heating, width of heating is 100 ~ 120mm, and adopts infrared radiation thermometer to measure heating-up temperature, point for measuring temperature is arranged on each 75mm place, weld seam original edge both sides, during thermometric, infrared radiation thermometer is perpendicular to surface of the work, and the spacing between infrared radiation thermometer and surface of the work is less than or equal to 200mm.
9. the welding procedure of Q460 steel thick plate as claimed in any of claims 1 to 7 in one of claims, it is characterized in that, when welding, controlling its welding current is 280 ~ 300A, and arc voltage is 28 ~ 30V, and speed of welding is 20 ~ 25cm/min, workpiece grooves gap is 0 ~ 2mm, unfitness of butt controls to be less than or equal to 1mm, and tack weld length is 15 ~ 30mm, and tack weld spacing is 100 ~ 300mm.
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| CN105537788A (en) * | 2015-11-17 | 2016-05-04 | 浙江盛达铁塔有限公司 | Welding seam alloy and welding method of weather-resistant steel |
| CN105598563A (en) * | 2016-02-24 | 2016-05-25 | 鞍钢建设集团有限公司 | Gas shielded welding technology of steel Q420GJC for building structure |
| CN106238863A (en) * | 2016-08-17 | 2016-12-21 | 国投新集能源股份有限公司 | A kind of method abolishing the steel borehole wall |
| CN106270928A (en) * | 2016-08-30 | 2017-01-04 | 鞍钢建设集团有限公司 | A kind of welding method of building structural steel Q460GJC |
| CN106363281A (en) * | 2016-08-30 | 2017-02-01 | 鞍钢建设集团有限公司 | Welding method for steel Q390GJC for building structure |
| CN106392255A (en) * | 2016-10-31 | 2017-02-15 | 中车长春轨道客车股份有限公司 | Welding control process for vehicle body doorway stand column stress relief hole |
| CN108723558A (en) * | 2018-06-25 | 2018-11-02 | 广州市泰诚船舶工业有限公司 | A kind of ship slab welding process |
| CN109454313A (en) * | 2018-03-28 | 2019-03-12 | 南京宝色股份公司 | A kind of big specification low-alloy steel tube sheet welding plate preparation process |
| CN110076420A (en) * | 2019-06-03 | 2019-08-02 | 山东大学 | Consider the slab Robotic Dynamic path of welding method and system for planning of angular deformation |
| CN111822823A (en) * | 2020-07-02 | 2020-10-27 | 大连船舶重工集团有限公司 | Ultra-thick plate narrow gap welding process method |
| CN112475549A (en) * | 2020-12-02 | 2021-03-12 | 甘肃电投金昌发电有限责任公司 | Argon arc welding multilayer multi-channel water wall pipe repairing method |
| CN113146084A (en) * | 2021-03-04 | 2021-07-23 | 江苏科技大学 | Welding process of thick plate high-strength steel |
| CN113319403A (en) * | 2021-06-07 | 2021-08-31 | 中国建筑一局(集团)有限公司 | Welding construction method for ultra-thick plate |
| CN114273764A (en) * | 2022-02-21 | 2022-04-05 | 中铁山桥集团有限公司 | Method for welding butt ring weld of high-strength steel pipe pile |
| CN114799419A (en) * | 2022-06-06 | 2022-07-29 | 安徽精工钢结构有限公司 | CO 2 Gas shielded welding coarse welding wire full penetration bottoming and filling welding process |
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| CN111822823A (en) * | 2020-07-02 | 2020-10-27 | 大连船舶重工集团有限公司 | Ultra-thick plate narrow gap welding process method |
| CN111822823B (en) * | 2020-07-02 | 2022-04-08 | 大连船舶重工集团有限公司 | Ultra-thick plate narrow gap welding process method |
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