CN104002030A - Butt joint method for super-thick steel plates - Google Patents
Butt joint method for super-thick steel plates Download PDFInfo
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- CN104002030A CN104002030A CN201410252792.1A CN201410252792A CN104002030A CN 104002030 A CN104002030 A CN 104002030A CN 201410252792 A CN201410252792 A CN 201410252792A CN 104002030 A CN104002030 A CN 104002030A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K9/00—Arc welding or cutting
- B23K9/18—Submerged-arc welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K33/00—Specially-profiled edge portions of workpieces for making soldering or welding connections; Filling the seams formed thereby
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- 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
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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
- B23K9/235—Preliminary treatment
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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
- B23K9/32—Accessories
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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
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
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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
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Arc Welding In General (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The invention discloses a butt joint method for super-thick steel plates. The butt joint method for the super-thick steel plates comprises the steps of: machining grooves at butt joint parts of the steel plates, wherein the grooves are U-shaped grooves with symmetrical two surfaces, the angle of each groove is 8-10 degrees, and the radius of the arc at the root of each groove is 9-11mm; pre-heating before welding, wherein the preheating temperature is 40-60 DEG C, and locating welded joints after preheating; alternatively welding the welded joints on two sides by turning over for many times, backstep welding the layers of welding joints; keeping temperature in a welding process to be not more than 200 DEG C; keeping warm after welding, and cooling slowly. Since the U-shaped grooves are employed, the sectional area of the welded joints are greatly reduced, thermal input is reduced, control on welding deformation is facilitated, welding residual stress is reduced by backstep welding, two sides of the welded joint of the steel plate are subjected to uniform force by turning over for many times in welding, deformation in the welding process is corrected, the super-thick steel plate is rapid in heat dissipation after welding, quality of the welded joint is ensured by the method of keeping warm after welding, and stress deformation can be reduced by slowly cooling.
Description
Technical field
The present invention relates to a kind of docking calculation of super-thick steel plate.
Background technology
Steel plate divides by thickness, sheet metal <4 millimeter (the thinnest 0.2 millimeter), 4～60 millimeters of steel plates, 60～115 millimeters of super-thick steel plates.Superimposed section of bedplate thickness of slab of Ma'an Mountain's head tower steel reinforced concrete reaches 150mm, overall size is that 7800X15900mm, weight reach 136.9t, and elevator hole of gathering on it, concreting hole, prestress wire are by hole etc.Bedplate and the shifting board on it all require polishing to hold out against welding, during making, to bedplate whole unit flatness, require very high.Because bedplate steel used are Q345D/150mm steel plate, be subject to the impact of steel mill's rolling mill practice, its raw material flatness of dispatching from the factory is poor, can not meet design and manufacture requirement far away.And the steel plate thickness of 150mm, less in bridge steel structure manufacture field application, the working ability of lathe also cannot reach the flat effect of roller plate roller.In view of above reason, must study from manufacturing process, make steel plate reach the flatness of designing requirement, thereby guarantee the workmanship of superimposed section of steel reinforced concrete and the total quality of whole head tower, the flatness how improving after the docking of super-thick steel plate is the applicant's problem demanding prompt solution to reach designing requirement always.
Summary of the invention
The object of the invention is the deficiency existing for prior art, a kind of docking calculation of super-thick steel plate is provided, improved the flatness after super-thick steel plate docking, meet design requirement.
For achieving the above object, the technical scheme that the docking calculation of super-thick steel plate of the present invention adopts is: a kind of docking calculation of super-thick steel plate, the thickness of steel plate is 140-200mm, material is Q345D, process the joint cut of two block plates, cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 8 °～10 °, and the radius of groove root circular arc is 9～11mm; Before welding, carry out preheating, preheat temperature reaches 40～60 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, every layer of weld seam backstep; Between welding process road, temperature keeps not higher than 200 ℃; Insulation after welding, slow cooling.Adopt this U-shaped cut, when guaranteeing operability, greatly reduce section of weld joint long-pending, reduced heat input, be conducive to the control of welding deformation, adopt the method for backstep to lower welding residual stress, repeatedly standing up welding can be so that the both sides of steel plate weld seam be stressed evenly, proofread and correct the distortion in welding process, preheat temperature should not be too high, the higher sheet material of temperature is heated and produces distortion, also can cause tack welding cracking, the heat radiation of special heavy plate postwelding is very fast, after thick plates completes, adopt the method for postweld heat preservation to guarantee weldquality, slow cooling can reduce stress deformation.
In welding process, steel plate is carried out to anti-deformation constraint.Anti-deformation constraint is alternately welded and is combined with repeatedly standing up two side welds, reduces welding deformation.
In welding process, heat at the back side of butt welded seam.Reverse side heating during welding, makes it to synchronize with solder side to expand and synchronous, plays the effect that reduces welding stress simultaneously.
Described preheating, back of weld add the heating of thermal recovery crawler type heating cushion, and heating-up temperature is 100-120 ℃.Adopt crawler type heating cushion, both guaranteed weld preheating temperature evenly and continuity, can also play a role while bringing down a fever postweld heat preservation ring is cold.
Welded afterwards to 190 ℃～210 ℃ of weld heating, insulation is not less than 8 hours, and weld seam covers slow cooling with asbestos.Preferably 200 ℃.
Welded rear to the heating of weld employing crawler type heating cushion.Heating is stable, can also play the effect of insulation in the process of slow cooling.
Repeatedly stand up, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, then weld reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side for the third time.
Described steel plate thickness is 150mm, and joint cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 9 °, and groove root circular arc is that radius is 8mm.
Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 20～23 m/h.
The present invention compared with prior art, has the following advantages:
Tradition tack welding adopts flame preheat, special heavy plate thickness of slab rapid heat dissipation, and tack welding is very fast cool time, and the effect due to stress in cooling and expansion process all can cause tack weld cracking; The expansion energy of adding slab local heating thermometal causes in whole weldment generation plane or the distortion of out-of-plane various forms.
The design adopts crawler type heating cushion, has both guaranteed the even and continuity of weld preheating temperature; Reverse side heating during welding, makes it to synchronize with solder side to expand and synchronous, plays the effect that reduces welding stress simultaneously; Can also play a role while bringing down a fever postweld heat preservation ring is cold.
When tack welding preheat temperature reaches 50 ℃, butt welded seam positions.Tack welding preheat temperature should not be too high, and the higher sheet material of temperature is heated and produces distortion, also can cause tack welding cracking.
Postweld heat preservation, the heat radiation of special heavy plate postwelding is very fast, after thick plates completes, adopts the method for postweld heat preservation to guarantee weldquality, and 200 ℃ of left and right of postheating pad heating, are incubated 2 hours, and weld seam covers slow cooling with asbestos.
Special heavy plate joint adopts the U-shaped groove of double-sided symmetrical, bevel angle is 8 °～10 ° preferably 9 °, and the preferred 10mm of groove root arc radius greatly reduces section of weld joint long-pending when guaranteeing operability, reduce heat input, be conducive to the control of welding deformation.
Accompanying drawing explanation
Fig. 1 is the joint cut structural representation of super-thick steel plate.
Fig. 2 is commissure welding sequence schematic diagram.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, further illustrate the present invention, should understand these embodiments is only not used in and limits the scope of the invention for the present invention is described, after having read the present invention, those skilled in the art all fall within the application's claims limited range to the modification of the various equivalent form of values of the present invention.
Be illustrated in figure 1 the joint cut structural representation of super-thick steel plate, the joint cut of two block plates is the U-shaped groove of double-sided symmetrical, and the angle theta angle of groove is 8 °～10 °, and the radius of groove root circular arc 1 is 9～11mm.
A docking calculation for super-thick steel plate, the thickness of steel plate is 140mm-200mm, and material is Q345D, first processes the joint cut of two block plates, and cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 8 °～10 °, the radius of groove root circular arc is 9～11mm; Before welding, carry out preheating, preheat temperature reaches 40～60 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, overturning steel plate when first welding as shown in Figure 2 fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side, every layer of weld seam backstep for the third time; In welding process, steel plate is carried out to anti-deformation constraint, in the time of welding, heat at the back side of butt welded seam, and heating-up temperature is 100-120 ℃, and between welding process road, temperature keeps not higher than 200 ℃, and preheating, back of weld add the heating of thermal recovery crawler type heating cushion; Welded rear employing crawler type heating cushion heating weld temperature and be controlled at 190 ℃～210 ℃, insulation is not less than 8 hours, and weld seam covers slow cooling with asbestos.Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 20～23 m/h.
The welding procedure test of the performance of weld seam by repeatedly determine, in welding procedure test process, we are to groove size, and welding condition etc. have been done a large amount of tests.Test shows, the welding performance of this groove type is all relatively good.Low-temperature impact mean value in weld seam center is 147J, and low-temperature impact mean value in heat affected area is 107J.Three district's maximum hardness are 180, and minimum of a value is 150.Weld metal zone tensile strength, yield strength, elongation after fracture, joint tensile strength all meet design requirement and relevant criterion requirement, and have larger storage level.Test welding point is through appearance test, ultrasonic examination check, the check of macroscopical section, up-to-standard.Can be used as the foundation of making the thick steel welding technology of Ma'an Mountain bridge head tower 150mm completely.
In welding process, constantly pay close attention to welding deformation, when weldment starts to be out of shape, can increase suitable constraint and carry out Reducing distortion.When deformation angle reaches 10 degree left and right, butt-welding fitting stands up (back chipping) welding, and effect is better.As deformation angle is less, just stand up, need to increase and stand up number of times, consume Production Time, produce unnecessary economy consumption.As deformation angle stands up more greatly, reverse side welding is shunk and is fallen flat.Postwelding flatness is poor, and finishing difficulty, produces unnecessary economy consumption equally.While standing up, adopt vertical weld to stand up avoids weld seam stressed as far as possible.As conditions permit preferably adopts unsettled turning over, greatly lower the stressed of weld seam.
Embodiment mono-
The thickness of steel plate is 140mm, and material is Q345D, first processes the joint cut of two block plates, and cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 8 °, and the radius of groove root circular arc is 9mm; Before welding, carry out preheating, preheat temperature reaches 40 ± 5 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side, every layer of weld seam backstep for the third time; In welding process, steel plate is carried out to anti-deformation constraint, in the time of welding, heat at the back side of butt welded seam, and heating-up temperature is 90 ℃, and between welding process road, temperature keeps not higher than 200 ℃, and preheating, back of weld add the heating of thermal recovery crawler type heating cushion; Welded rear employing crawler type heating cushion heating weld temperature and be controlled at 190 ℃, be incubated 8 hours, weld seam covers slow cooling with asbestos.Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 20 m/h.
Embodiment bis-
The thickness of steel plate is 150mm, and material is Q345D, first processes the joint cut of two block plates, and cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 9 °, and the radius of groove root circular arc is 10mm; Before welding, carry out preheating, preheat temperature reaches 50 ± 5 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side, every layer of weld seam backstep for the third time; In welding process, steel plate is carried out to anti-deformation constraint, in the time of welding, heat at the back side of butt welded seam, and heating-up temperature is 110 ℃, and between welding process road, temperature keeps not higher than 200 ℃, and preheating, back of weld add the heating of thermal recovery crawler type heating cushion; Welded rear employing crawler type heating cushion heating weld temperature and be controlled at 200 ℃, be incubated 8 hours, weld seam covers slow cooling with asbestos.Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 21.5 m/h.
Embodiment tri-
The thickness of steel plate is 180mm, and material is Q345D, first processes the joint cut of two block plates, and cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 10 °, and the radius of groove root circular arc is 11mm; Before welding, carry out preheating, preheat temperature reaches 60 ± 5 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side, every layer of weld seam backstep for the third time; In welding process, steel plate is carried out to anti-deformation constraint, in the time of welding, heat at the back side of butt welded seam, and heating-up temperature is 125 ℃, and between welding process road, temperature keeps not higher than 200 ℃, and preheating, back of weld add the heating of thermal recovery crawler type heating cushion; Welded rear employing crawler type heating cushion heating weld temperature and be controlled at 210 ℃, be incubated 8 hours, weld seam covers slow cooling with asbestos.Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 23 m/h.
Embodiment tetra-
The thickness of steel plate is 200mm, and material is Q345D, first processes the joint cut of two block plates, and cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 10 °, and the radius of groove root circular arc is 11mm; Before welding, carry out preheating, preheat temperature reaches 60 ± 5 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side, every layer of weld seam backstep for the third time; In welding process, steel plate is carried out to anti-deformation constraint, in the time of welding, heat at the back side of butt welded seam, and heating-up temperature is 125 ℃, and between welding process road, temperature keeps not higher than 200 ℃, and preheating, back of weld add the heating of thermal recovery crawler type heating cushion; Welded rear employing crawler type heating cushion heating weld temperature and be controlled at 210 ℃, be incubated 8 hours, weld seam covers slow cooling with asbestos.Welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 23 m/h.
Claims (9)
1. a docking calculation for super-thick steel plate, the thickness of steel plate is 140-200mm, material is Q345D, it is characterized in that: the joint cut of processing two block plates, cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 8 °～10 °, and the radius of groove root circular arc is 9～11mm; Before welding, carry out preheating, preheat temperature reaches 40～60 ℃, and after preheating, butt welded seam positions; Adopt and repeatedly stand up the alternately welding of two side welds, every layer of weld seam backstep; Between welding process road, temperature keeps not higher than 200 ℃; Insulation after welding, slow cooling.
2. the docking calculation of super-thick steel plate according to claim 1, is characterized in that: in welding process, steel plate is carried out to anti-deformation constraint.
3. the docking calculation of super-thick steel plate according to claim 1, is characterized in that: in welding process, heat at the back side of butt welded seam.
4. the docking calculation of super-thick steel plate according to claim 3, is characterized in that: described preheating, back of weld add the heating of thermal recovery crawler type heating cushion, and heating-up temperature is 100-120 ℃.
5. the docking calculation of super-thick steel plate according to claim 1, is characterized in that: welded that rear insulation is not less than 8 hours to 190 ℃～210 ℃ of weld heating, weld seam covers slow cooling with asbestos.
6. the docking calculation of super-thick steel plate according to claim 5, is characterized in that: welded rear to the heating of weld employing crawler type heating cushion.
7. the docking calculation of super-thick steel plate according to claim 1, it is characterized in that: repeatedly stand up, overturning steel plate when first welding fillet in normal shear and being soldered to 1/4 degree of depth of U-shaped groove, weld again reverse side weld seam, overturning steel plate again while being soldered to 1/2 degree of depth of U-shaped groove, then weld full positive U-shaped groove, overturning steel plate, welds the completely U-shaped groove of reverse side for the third time.
8. according to the docking calculation of any one super-thick steel plate of claim 1～7, it is characterized in that: described steel plate thickness is 150mm, joint cut is the U-shaped groove of double-sided symmetrical, and bevel angle is 9 °, and groove root circular arc is that radius is 8mm.
9. the docking calculation of super-thick steel plate according to claim 8, is characterized in that: welding material is welding wire for submerged-arc welding H10Mn2, and gage of wire is 5mm, joins SJ101Q solder flux; Welding current is 580～720A, and weldingvoltage is 26～32V, and weldering speed is 20～23 m/h.
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| CN114769811A (en) * | 2022-05-25 | 2022-07-22 | 中国建筑第八工程局有限公司 | Welding method for cross-shaped high-strength super-thick steel plate |
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