CN104002030B - Butt joint method for super-thick steel plates - Google Patents
Butt joint method for super-thick steel plates Download PDFInfo
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- CN104002030B CN104002030B CN201410252792.1A CN201410252792A CN104002030B CN 104002030 B CN104002030 B CN 104002030B CN 201410252792 A CN201410252792 A CN 201410252792A CN 104002030 B CN104002030 B CN 104002030B
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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
-
- 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
- B23K9/02—Seam welding; Backing means; Inserts
-
- 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
- B23K9/00—Arc welding or cutting
- B23K9/32—Accessories
-
- 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
-
- 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 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 is divided by thickness, sheet metal < 4 millimeters (the thinnest 0.2 millimeter), 4～60 millimeters of steel plate, super-thick steel plate 60～
115 millimeters.Ma'an Mountain's head tower steel reinforced concrete overlapping section bedplate thickness of slab reaches 150mm, overall size is 7800x15900mm, weight reaches
136.9t, elevator hole of gathering thereon, concreting hole, prestress wire pass through hole etc..Bedplate and shifting board thereon
All require polishing to hold out against welding, during making, base plate unit integral planar degree is required very high.Due to steel used by bedplate
For q345d/150mm steel plate, affected by steel mill's rolling mill practice, its raw material flatness of dispatching from the factory is poor, far can not expire
Foot design and manufacture requirements.And the steel plate thickness of 150mm, manufacture field in bridge steel structure and apply less, the processing energy of lathe
Power is also unable to reach the effect that roller plate rolls out.For these reasons it is necessary to be studied from manufacturing process, so that steel plate is reached and set
How the flatness that meter requires, thus ensureing the steel reinforced concrete overlapping workmanship of section and the total quality of whole head tower, improve special thickness
Flatness after the docking of steel plate is always the applicant's problem demanding prompt solution to reach design requirement.
Content of the invention
The purpose of the present invention is in view of the shortcomings of the prior art, provides a kind of docking calculation of super-thick steel plate, improves
Flatness after super-thick steel plate docking, meets design requirement.
For achieving the above object, the docking calculation of super-thick steel plate of the present invention the technical scheme is that a kind of super-thick steel plate
Docking calculation, the thickness of steel plate is 140-200mm, and material is q345d, the joint groove of two blocks of steel plates of processing, and groove is
Double-sided symmetrical u groove, bevel angle is 8 °～10 °, and the radius of groove root circular arc is 9～11mm；Preheated before welding,
Preheating temperature reaches 40～60 DEG C, after preheating, weld seam is positioned；Replace welding, every layer of weldering using repeatedly standing up two side welds
Seam backstep；Between welding process road, temperature keeps not higher than 200 DEG C；It is incubated after welding, slow cooling.Using this u groove,
Ensure that greatly reducing section of weld joint while operability amasss, and decreases heat input, is conducive to the control of welding deformation, adopts
Lower welding residual stress with the method for backstep, repeatedly stand up welding so that the both sides uniform force of steel plate weld seam,
Deformation in correction welding process, preheating temperature should not be too high, and the higher sheet material of temperature is heated and is deformed, and also results in tack welding
Cracking, the radiating of special heavy plate postwelding is very fast, and after the completion of thick plates, the method using postweld heat preservation to guarantee weldquality, delays
Cold can reduce stress deformation.
In welding process, anti-deformation constraint is carried out to steel plate.Anti-deformation constrains and repeatedly stands up two side welds and replace welding
Combine, reduce welding deformation.
Welding process heats to the back side of weld seam.Reverse side heating during welding, is allowed to synchronously expand with solder side
And synchronous, simultaneously work as reducing the effect of welding stress.
Described preheating, back of weld heating are heated using crawler type heating cushion, and heating-up temperature is 100-120 DEG C.Using
Crawler type heating cushion, both ensured weld preheating temperature uniformly and continuity, can also postweld heat preservation ring is cold bring down a fever when play
Effect.
After the completion of welding, 190 DEG C～210 DEG C are heated to weld, insulation is not less than 8 hours, weld seam asbestos cover slow
Cold.Preferably 200 DEG C.
Crawler type heating cushion is adopted to heat weld after the completion of welding.Heating is stable, during slow cooling also
The effect of insulation can be played.
Repeatedly stand up, overturning steel plate when first welding fillet in normal shear is soldered to 1/4 depth of u groove, then weld reverse side weldering
Seam, be soldered to u groove 1/2 depth when overturning steel plate again, then weld the u groove in full front, third time overturning steel plate,
The u groove of the full reverse side of weldering.
Described steel plate thickness is 150mm, and joint groove is double-sided symmetrical u groove, and bevel angle is 9 °, groove root
Portion's circular arc is 8mm for radius.
Welding material is welding wire for submerged-arc welding h10mn2, and gage of wire is 5mm, joins sj101q solder flux；Welding current be 580～
720a, weldingvoltage is 26～32v, and weldering speed is 20～23m/h.
The present invention compared with prior art, has the advantage that
Traditional tack welding adopts flame to preheat, special heavy plate thickness of slab rapid heat dissipation, and tack welding cool time is very fast, cools down and expands
During due to the effect of stress all can cause tack weld ftracture；Expansion energy along with slab local heating thermometal causes
Whole weldment occur in plane or out-of-plane various form deformation.
The design adopts crawler type heating cushion, has both ensured the uniform of weld preheating temperature and continuity；During welding, reverse side adds
Heat, is allowed to synchronously be expanded and synchronous with solder side, simultaneously works as reducing the effect of welding stress；Can also be in postweld heat preservation
Ring is cold to be played a role when bringing down a fever.
When tack welding preheating temperature reaches 50 DEG C, weld seam is positioned.Tack welding preheating temperature should not be too high, and temperature is relatively
High sheet material is heated and is deformed, and also results in tack welding cracking.
Postweld heat preservation, the radiating of special heavy plate postwelding is very fast, and after the completion of thick plates, the method using postweld heat preservation to guarantee
Weldquality, postheating pad heats 200 DEG C about, is incubated 2 hours, weld seam asbestos cover slow cooling.
Special heavy plate joint adopts double-sided symmetrical u groove, and bevel angle is 8 °～10 ° preferably 9 °, groove root circular arc
The preferred 10mm of radius, greatly reduces section of weld joint while ensureing operability and amasss, decrease heat input, is conducive to welding
Connect the control of deformation.
Brief description
Fig. 1 is the joint divided edge structure schematic diagram of super-thick steel plate.
Fig. 2 is commissure welding sequence schematic diagram.
Specific embodiment
With reference to the accompanying drawings and detailed description, it is further elucidated with the present invention it should be understood that these embodiments are only used for
The present invention is described rather than limits the scope of the present invention, after having read the present invention, those skilled in the art are to the present invention
The modification of the various equivalent form of values all fall within the application claims limited range.
It is illustrated in figure 1 the joint divided edge structure schematic diagram of super-thick steel plate, the joint groove of two blocks of steel plates is two-sided
Symmetrical u groove, the angle theta angle of groove is 8 °～10 °, and the radius of groove root circular arc 1 is 9～11mm.
A kind of docking calculation of super-thick steel plate, the thickness of steel plate is 140mm-200mm, and material is q345d, first processes two pieces
The joint groove of steel plate, groove is double-sided symmetrical u groove, and bevel angle is 8 °～10 °, and the radius of groove root circular arc is
9～11mm；Preheated before welding, preheating temperature reaches 40～60 DEG C, after preheating, weld seam is positioned；Using repeatedly standing up
Two side welds replace and weld, as shown in Figure 2 first welding fillet in normal shear be soldered to u groove 1/4 depth when overturning steel plate, then weld
Reversed face weld seam, be soldered to u groove 1/2 depth when overturning steel plate again, then weld the u groove in full front, for the third time
Overturning steel plate, the u groove of the full reverse side of weldering, every layer of weld seam backstep；In welding process, anti-deformation constraint is carried out to steel plate,
While welding, the back side of weld seam is heated, heating-up temperature is 100-120 DEG C, between welding process road, temperature keeps being not higher than
200 DEG C, preheating, back of weld heating are using the heating of crawler type heating cushion；The heating weldering of crawler type heating cushion is adopted after the completion of welding
Connect place's temperature control at 190 DEG C～210 DEG C, insulation is not less than 8 hours, and weld seam asbestos cover slow cooling.Welding material is submerged arc
Welding wire h10mn2, gage of wire is 5mm, joins sj101q solder flux；Welding current is 580～720a, and weldingvoltage is 26～32v,
Weldering speed is 20～23m/h.
The welding procedure test that the performance of weld seam is passed through repeatedly determines, during welding procedure test, we are to slope
Mouth size, welding condition etc. has done substantial amounts of test.Test shows, the welding performance of this groove type is all relatively good.Weldering
Seam center low temperature impact mean value is 147j, and low-temperature impact mean value in heat affected area is 107j.Three area's maximum hardness are 180,
Minimum of a value is 150.Weld metal zone tensile strength, yield strength, elongation after fracture, joint tensile strength all meet design requirement and phase
Pass standard requires, and has larger storage level.Test welding point is checked through appearance test, ultrasonic examination, macroscopical section inspection
Test, up-to-standard.Completely can be used as the foundation making Ma'an Mountain bridge head tower 150mm thickness steel welding technology.
In welding process, the moment pays close attention to welding deformation, can increase suitable constraint to reduce when weldment starts deformation
Deformation.When deformation angle reaches 10 degree about, butt-welding fitting is stood up (back chipping) welding, and effect is preferable.As deformation angle relatively
Little just stand up, need to increase and stand up number of times, consume Production Time, produce unnecessary economic consumption.Stand up as deformation angle is larger,
Reverse side welding contraction falls flat.Postwelding flatness is poor, and finishing is difficult, the unnecessary economic consumption of same generation.
Stood up using vertical weld when standing up and avoid weld seam stress as far as possible.If conditions permit is preferably with vacantly turning over, significantly lower weld seam
Stress.
Embodiment one
The thickness of steel plate is 140mm, and material is q345d, first processes the joint groove of two blocks of steel plates, and groove is two-sided right
Claim u groove, bevel angle is 8 °, the radius of groove root circular arc is 9mm；Preheated before welding, preheating temperature reaches 40
± 5 DEG C, after preheating, weld seam is positioned；Replace welding using repeatedly standing up two side welds, first welding fillet in normal shear is soldered to u
Overturning steel plate during 1/4 depth of type groove, then weld reverse side weld seam, overturn steel again during 1/2 depth being soldered to u groove
Plate, then welds the u groove in full front, third time overturning steel plate, the u groove of the full reverse side of weldering, every layer of weld seam backstep；?
In welding process, anti-deformation constraint is carried out to steel plate, while welding, the back side of weld seam is heated, heating-up temperature is 90 DEG C,
Between welding process road, temperature keeps not higher than 200 DEG C, and preheating, back of weld heating are using the heating of crawler type heating cushion；Weld
Adopt crawler type heating cushion heating weld temperature control at 190 DEG C after one-tenth, be incubated 8 hours, weld seam asbestos cover slow cooling.Weldering
Connecing material is welding wire for submerged-arc welding h10mn2, and gage of wire is 5mm, joins sj101q solder flux；Welding current is 580～720a, welding electricity
Press as 26～32v, weldering speed is 20m/h.
Embodiment two
The thickness of steel plate is 150mm, and material is q345d, first processes the joint groove of two blocks of steel plates, and groove is two-sided right
Claim u groove, bevel angle is 9 °, the radius of groove root circular arc is 10mm；Preheated before welding, preheating temperature reaches 50
± 5 DEG C, after preheating, weld seam is positioned；Replace welding using repeatedly standing up two side welds, first welding fillet in normal shear is soldered to u
Overturning steel plate during 1/4 depth of type groove, then weld reverse side weld seam, overturn steel again during 1/2 depth being soldered to u groove
Plate, then welds the u groove in full front, third time overturning steel plate, the u groove of the full reverse side of weldering, every layer of weld seam backstep；?
In welding process, anti-deformation constraint is carried out to steel plate, while welding, the back side of weld seam is heated, heating-up temperature is 110
DEG C, between welding process road, temperature keeps not higher than 200 DEG C, and preheating, back of weld heating are using the heating of crawler type heating cushion；Welding
After the completion of using crawler type heating cushion heating weld temperature control at 200 DEG C, be incubated 8 hours, weld seam asbestos cover slow cooling.
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, welding
Voltage is 26～32v, and weldering speed is 21.5m/h.
Embodiment three
The thickness of steel plate is 180mm, and material is q345d, first processes the joint groove of two blocks of steel plates, and groove is two-sided right
Claim u groove, bevel angle is 10 °, the radius of groove root circular arc is 11mm；Preheated before welding, preheating temperature reaches
60 ± 5 DEG C, after preheating, weld seam is positioned；Replace welding using repeatedly standing up two side welds, first the welding of welding fillet in normal shear
To u groove 1/4 depth when overturning steel plate, then weld reverse side weld seam, overturn again during 1/2 depth being soldered to u groove
Steel plate, then welds the u groove in full front, third time overturning steel plate, the u groove of the full reverse side of weldering, every layer of weld seam backstep；
In welding process, anti-deformation constraint is carried out to steel plate, while welding, the back side of weld seam is heated, heating-up temperature is 125
DEG C, between welding process road, temperature keeps not higher than 200 DEG C, and preheating, back of weld heating are using the heating of crawler type heating cushion；Welding
After the completion of using crawler type heating cushion heating weld temperature control at 210 DEG C, be incubated 8 hours, weld seam asbestos cover slow cooling.
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, welding
Voltage is 26～32v, and weldering speed is 23m/h.
Example IV
The thickness of steel plate is 200mm, and material is q345d, first processes the joint groove of two blocks of steel plates, and groove is two-sided right
Claim u groove, bevel angle is 10 °, the radius of groove root circular arc is 11mm；Preheated before welding, preheating temperature reaches
60 ± 5 DEG C, after preheating, weld seam is positioned；Replace welding using repeatedly standing up two side welds, first the welding of welding fillet in normal shear
To u groove 1/4 depth when overturning steel plate, then weld reverse side weld seam, overturn again during 1/2 depth being soldered to u groove
Steel plate, then welds the u groove in full front, third time overturning steel plate, the u groove of the full reverse side of weldering, every layer of weld seam backstep；
In welding process, anti-deformation constraint is carried out to steel plate, while welding, the back side of weld seam is heated, heating-up temperature is 125
DEG C, between welding process road, temperature keeps not higher than 200 DEG C, and preheating, back of weld heating are using the heating of crawler type heating cushion；Welding
After the completion of using crawler type heating cushion heating weld temperature control at 210 DEG C, be incubated 8 hours, weld seam asbestos cover slow cooling.
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, welding
Voltage is 26～32v, and weldering speed is 23m/h.
Claims (5)
1. a kind of docking calculation of super-thick steel plate, the thickness of steel plate is 140-200mm, material be q345d it is characterised in that: plus
The joint groove of two blocks of steel plates of work, groove is double-sided symmetrical u groove, and bevel angle is 8 °～10 °, groove root circular arc
Radius is 9～11mm；Preheated before welding, preheating temperature reaches 40～60 DEG C, after preheating, weld seam is positioned；Using many
Secondary two side welds that stand up replace welding, and when deformation angle reaches 10 degree about, butt-welding fitting carries out standing up back chipping welding, every layer of weldering
Seam backstep；Between welding process road, temperature keeps not higher than 200 DEG C；It is incubated after welding, slow cooling, to steel plate in welding process
Carry out anti-deformation constraint, in welding process, the back side of weld seam is heated, heating-up temperature is 100-120 DEG C, and welding completes
Afterwards 190 DEG C～210 DEG C are heated to weld, insulation is not less than 8 hours, and weld seam asbestos cover slow cooling.
2. super-thick steel plate according to claim 1 docking calculation it is characterised in that: after the completion of welding to weld adopt
Crawler type heating cushion heats.
3. super-thick steel plate according to claim 1 docking calculation it is characterised in that: repeatedly stand up, first weld face bonding
Overturning steel plate when seam weld is connected to 1/4 depth of u groove, then weld reverse side weld seam, be soldered to u groove 1/2 depth when again
Secondary overturning steel plate, then welds the u groove in full front, third time overturning steel plate, the u groove of the full reverse side of weldering.
4. the docking calculation according to any one super-thick steel plate of claims 1 to 3 it is characterised in that: described steel plate thickness is
150mm, joint groove is double-sided symmetrical u groove, and bevel angle is 9 °, and groove root circular arc is 8mm for radius.
5. super-thick steel plate according to claim 4 docking calculation it is characterised in that: welding material be welding wire for submerged-arc welding
H10mn2, gage of wire is 5mm, joins sj101q solder flux；Welding current is 580～720a, and weldingvoltage is 26～32v, weldering speed
For 20～23m/h.
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| CN201410252792.1A CN104002030B (en) | 2014-06-10 | 2014-06-10 | Butt joint method for super-thick steel plates |
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| CN201410252792.1A CN104002030B (en) | 2014-06-10 | 2014-06-10 | Butt joint method for super-thick steel plates |
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2014
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