CN109940298A - A kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method - Google Patents
A kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method Download PDFInfo
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Abstract
The invention discloses a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method in welding technology field, in two blocks of steel plates to finished edge two-sided at spelling, the two-sided entirety of groove is in X-type for elder generation；Side low-angle bevel angle is 29 °~31 °, and other side wide-angle bevel angle is 39 °~41 °, and root face is 1.5~2.5mm；The depth of the low-angle groove and the depth ratio of wide-angle groove are (2~2.5): 1.Low-angle groove side is welded in using gas shield again and carries out welding 2~4; form backing weld seam; then welding groove is welded using Lincoln weld in low-angle groove the same side full; steel plate is turned over again; carbon arc air gouging finishing is carried out to wide-angle groove side, is then welded in wide-angle groove side using Lincoln weld, groove welding is expired; it is finally kept the temperature, slowly cools to room temperature.The joint mechanical property welded is excellent, and welding quality is good, can be used in bridge construction.
Description
Technical field
The present invention relates to a kind of varying strength bridge steel plate complex welding methods, belong to Steel Bridge manufacturing field, are applicable in
In the welding of Q370qE and Q690qE high-strength bridge steel varying strength half-and-half joint.
Background technique
Currently, domestic bridge steel plate is based on Q345 steel and Q370 steel, the biggish component of part steel truss beam stress is
Using Q420 steel and Q500 steel, bridge steel develops to high-intensitive, high-performance direction.State key plan researches and develops me
State's bridge high-strength steel, is dressed to advanced international standard, and it is anti-to release ultra-low carbon bainite high intensity bridge steel plate Q690qE(for the first time
Tensile strength >=810Mpa), and be applied in Wuhan Jiang-Han Area Qi Qiao demonstration engineering.
It is 672m that Wuhan Jiang-Han Area Qi Qiao, which is overall length, the heavily loaded highway bridge in two-way 6 lane, main truss two sides pier top arch rib lower edge
Part rod node plate uses Q690qE high-strength bridge steel.Lower boom gusset plate and web in design, there are Q370qE and
Q690qE varying strength high-strength steel half-and-half joint, in bridge manufacturing field temporarily without related Q370qE and Q690qE varying strength connector
Welding experience can be used for reference, and two kinds of high-strength steel tensile strength gaps are more than 200Mpa or so, and either wlding matches, still
In selection of Welding, great difficulty is all had, existing welding method is carried out using the welding method of conventional bridge steel
Welding, but welding deformation is big, weld strength is inadequate.Therefore, it expands and high-strength steel varying strength Joint Welding is studied.
This research will have substantial economics and social benefit to utilization of the Q690qE in exemplary engineering, while also be China
Bridge cause accumulates associated welds experience.
For these reasons, the present invention must be from the selection of welding material, the design and welding condition of welding groove
The various aspects control such as adjustment, Q370qE and Q690qE varying strength high-strength steel half-and-half joint is welded, so that high-strength steel
The mechanics of varying strength half-and-half joint meets design and standard requirements.
Summary of the invention
In light of the defects in the prior art, the purpose of the invention is to provide a kind of Q370qE and Q690qE bridge structures
Steel varying strength half-and-half joint complex welding method, and the mechanical property of welding point is made to meet design requirement.
To achieve the above object, the present invention provides a kind of Q370qE and Q690qE structural steel for bridge varying strengths to spelling
Connector complex welding method, in turn includes the following steps:
It (1) is respectively two blocks of steel plates of Q370qE and Q690qE to finished edge two-sided at spelling, the two-sided entirety of groove in material
In X-type；Side low-angle bevel angle be 29 °~31 °, other side wide-angle bevel angle be 39 °~41 °, root face be 1.5~
2.5mm；The depth of the low-angle groove and the depth ratio of wide-angle groove are (2~2.5): 1.In the angle and corresponding ratio
Under example relationship, it is ensured that weld strength is high, and welding capacity is smaller, and when welding, the thermal deformation on steel plate two sides can cancel out each other.
(2) low-angle groove side is first welded in using gas shield and carries out welding 2~4, backing weld seam is formed, before welding
By steel plate preheating temperature as 70~80 DEG C；Electromagnetic induction heating device heating can be used when preheating steel plate.
(3) after the completion of backing weld seam, the temperature of steel plate is promoted to 115~155 DEG C, uses and buries in low-angle groove the same side
Arc automatic welding welds welding groove completely, and thermal weld stress control is carried out in 30~35KJ/cm using the welding method of multilayer multiple tracks
Welding；To prevent crackle from generating, before low-angle groove side is using submerged arc welding, as plate thickness δ < 32mm, preferably control
Steel billet temperature is 100 ± 5 DEG C；When plate thickness 32≤δ < 50mm, preferably control steel billet temperature is 120 ± 5 DEG C；Plate thickness δ >=50mm
When, preferably control steel billet temperature is 150 ± 5 DEG C.
(4) steel plate is turned over, carbon arc air gouging is carried out to wide-angle groove side, channeling depth and width keep uniform
Unanimously, 8mm >=R >=6mm circular arc is processed in the root of wide-angle groove, root face is all excluded, modify wide-angle groove
Carburized layer is removed in one side surface.
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, by groove welding
Full, thermal weld stress is controlled in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks.
(6) Insulation is taken after the completion of welding, the heat preservation of covering and heat insulating cotton slowly cools to room temperature.
It is as a further improvement of the present invention, backing weld seam is welded using solid welding wire, solid welding wire chemistry
Ingredient and weight percent are as follows:
C 0.070~0.72%,
Mn 1.5~1.7%,
Si 0.55~0.59%,
S 0.0025~0.035%,
P 0.012~0.014%,
Cr 0.32~0.34%,
Ni 1.01~1.05%,
Cu 0.21~0.25%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO218~22%,
Ar 78~82%.
The diameter of solid welding wire is preferably 1.2~1.8mm.Yield strength Rel 700MPa tensile strength Rm 764MPa breaks
Elongation 22% afterwards, -40 DEG C of cold impact values are 110J；
It is as a further improvement of the present invention, the welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses
Are as follows:
C 0.085~0.095%,
Mn 1.95~1.99%,
Si 0.05~0.07%,
P 0.01~0.014%,
S 0.0045~0.0055%,
Mo 0.26~0.30%,
Ni 0.96~1%,
Cr 0.26~0.3%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 3.8~4.2mm, yield strength Rel 630MPa, tensile strength Rm 720MPa, elongation after fracture
25%, -40 DEG C of cold impact values are 103J；Solder flux is SJ105q, and solder flux baking temperature is 350 ± 10 DEG C, baking time 1.5
~2.5h.
When carrying out multi-layer multi-pass welding using Lincoln weld, 140~180 DEG C of steel billet temperature are kept between road.
The present invention is compound using the protection weldering+Lincoln weld of solid welding wire argon gas by designing reasonable welding groove
Welding method carries out welding, is finally completed the welding of high-strength steel varying strength half-and-half joint, carries out ultrasonic wave spy after the completion of welding
Wound after ultrasonic examination is qualified, carries out mechanical property test, specific as follows:
The X-type groove of design, root face are 1.5~2.5mm, the back chipping amount of diminishbb weld seam, so that weld seam two sides after back chipping
Deposited metal loading is suitable, reduces welding deformation amount, while it is smaller to design bevel angle, reduces thermal weld stress, finally
Flatness after guaranteeing the welding of varying strength connector steel plate.
Three are welded in low-angle groove side using solid welding wire mixed gas arc welding, welding position state is prosposition.It is solid
After welding wire welds three backing weld seams, the temperature of steel plate can be promoted to 150 DEG C or more, and more single is welded using Lincoln weld
Cut deal substantially reduces welding pre-heating temperature, improves production efficiency.
Using the welding method of multilayer multiple tracks, prevents impurity element in welding wire to be precipitated in Weld pipe mill, influence the power of weld seam
Learn performance；The substrate steel sheet: material is respectively Q370qE and Q690qE, and plate thickness is preferably 32~50mm, backing weld seam welding
3.When steel plate thickness 32mm, Q690qE Mechanical Characteristics are as follows: yield strength ReL >=690MPa, tensile strength Rm >=
810MPa, elongation percentage A >=14%, -40 DEG C of KV2 ballistic work >=120J:Q370qE Mechanical Characteristics are as follows: yield strength ReL >=
370MPa, tensile strength Rm >=510MPa, elongation percentage A >=20%, -40 DEG C of KV2 ballistic work >=120J.
The performance of welding point: the tensile strength of weld seam half-and-half joint is 556MPa, and fracture position is low material Q370qE
Side；The yield strength of weld seam is 708MPa, weld seam tensile strength 759Mpa, elongation after fracture 25；Three area's highest of welding point
Hardness HV10It is 319, -40 DEG C of cold impact values of weld seam are respectively 123J, 132J, 150J；- 40 DEG C of the side Q370qE heat affected area is low
Warm impact value is respectively 225J, 227J, 204J；- 40 DEG C of the heat affected area in the side Q690qE cold impact value is respectively 245J, 246J,
219J；Half-and-half joint bend test does not find crackle；High-strength steel welding joint mechanical property is good, can satisfy design and correlation
Standard requirements, weld dimensions low-temperature impact have biggish surplus, and three area's hardness of weld seam is less than HV10 380, it does not generate
Hardened structure.
The preheating is heated using electromagnetic induction heating device, and heating temperature is 70~80 DEG C.Using electromagnetic induction plus
Hot equipment can guarantee that steel plate is fully warmed-up, and keep steel thickness center and surface of steel plate that can reach technique requirement.
Temperature is maintained at 140~180 DEG C between the welding process road；Microalloy member is added in high strength steel plate Q690qE
Element answers strict control to weld temperature between road, avoids alloying element scaling loss.
Compared with prior art, the present invention having the advantage that
The present invention has chosen suitable welding material combination, realizes the high-intensitive bridge that tensile strength gap is greater than 300Mpa for the first time
With the welding of steel Q370qE and Q690qE varying strength half-and-half joint.Firstly, what is considered is weld metal intensity, solid weldering is chosen
It is former to belong to moderate strength matching between Q370qE and Q690qE for the combination of silk and welding wire for submerged-arc welding, the tensile strength of deposited metal
Then, the transition weld seam of one layer of intermediate intensity, the alloying element in deposited metal are formed among two kinds of varying strength intensity base materials
Reinforcement has been carried out to the side Q370qE chemical analysis, has improved the mechanical property of Q370qE side weld fusion area, while not by Q690qE
The alloying element of side dilutes, and the mechanical property of the side Q690qE fusion area is maintained, to guarantee entire weld metal zone mechanical property.Its
It is secondary, it is contemplated that two kinds of varying strength connector low-temperature impact requirements are -40 DEG C, solid welding wire and the welding wire for submerged-arc welding combination of selection,
A certain amount of nickel element is added in deposited metal, -40 DEG C of low temperature impact properties are good.Selected welding material combination intensity and low temperature
Impact flexibility has both, and is to weld the ideal material of Q370qE and Q690qE steel varying strength connector.
The present invention is right to the regulation according to GB 4675.1 " the oblique Y type groove welding crack test method of weldability test "
32mm and 50mm steel plate, which test small iron and grinds, grinds test with big iron, and it is solid welding wire that small iron, which grinds test welding material, and diameter is
Φ1.2.It is welding wire for submerged-arc welding that big iron, which grinds test welding material, and diameter is Φ 4.0.After 2~4 backing weld seam of bottom welding, interlayer
Temperature can reach 150 DEG C, considerably reduce the preheating temperature of Q690qE steel, so that preheating temperature declines as 70~80 DEG C,
The generation that can prevent weld seam delayed crack can be improved production efficiency, and have excellent craftsmanship and exploitativeness.
After the welding material combination that the present invention chooses welds Q370qE and Q690qE varying strength half-and-half joint, Ge Xiangli
Learning performance can satisfy standard and design requirement, while the intensity of Seam and heat effected zone is above Q370qE strength of parent, weldering
Seam bond pull tension failure position is low material Q370qE base material side, not in half-and-half joint stress concentration point and weld seam weakness position
Fracture is set, for having preferable safety on science of bridge building Q370qE and Q690qE varying strength connector.
The present invention is designed using X-type groove, root face 2mm, the less back chipping workload of wide-angle groove, guarantee can
Section of weld joint product is greatly reduced while operational, is reduced heat input, is conducive to the control of welding deformation.
The formulation of technical solution of the present invention is according to being all built upon on the basis of qualification of welding procedure, and the present invention is in implementation process
In, it can achieve that good welding joint mechanical property is excellent and efficient welding, it is practical.Therefore, the present invention is to high intensity
The welding important in inhibiting of bridge steel varying strength half-and-half joint.
Detailed description of the invention
Fig. 1 is divided edge structure schematic diagram at 1 pair of reply spelling of embodiment.
Fig. 2 is commissure welding sequence schematic diagram, and in figure, 1,3 illustrate for submerged-arc welding position, and 2 show for backing weld seam position
Meaning.
Specific embodiment
Embodiment 1
Welding steel with a thickness of 32mm, material is respectively Q370qE and Q690qE, and when welding successively carries out in accordance with the following steps:
(1) as shown in Figure 1 to spelling divided edge structure schematic diagram, two blocks of steel plates to finished edge two-sided at spelling, the two-sided entirety of groove
In X-type；Side low-angle bevel angle is 30 °, and 60 ° of angle is integrally formed in the low-angle groove between two blocks of steel plates, another
Side wide-angle bevel angle is 40 °, and 80 ° of angle, root face 2mm is integrally formed in the wide-angle groove between two blocks of steel plates；Institute
The depth ratio of the depth and wide-angle groove of stating low-angle groove is 2:1, and the depth of low-angle groove is 20mm, wide-angle groove
Depth be 10mm.
(2) it is heated before weldering using electromagnetic induction heating device, heating temperature is 70~80 DEG C, as shown in Fig. 2, first using gas
Body protection is welded in low-angle groove side and carries out 3 backing weld seams of welding；
Welding material is solid welding wire, diameter 1.2mm；The volume content of protective gas is 20%CO2+80%Ar.Welding current
For 240~260A, weldingvoltage is 25~28V, and weldering speed is 280~320 mm/min.
(3) after the completion of backing weld seam, the temperature of steel plate is promoted to 115~155 DEG C, uses and buries in low-angle groove the same side
Arc automatic welding welds welding groove completely, and thermal weld stress control is carried out in 30~35KJ/cm using the welding method of multilayer multiple tracks
Welding；Welding welding material is welding wire for submerged-arc welding, and diameter 4.0mm matches SJ105Q solder flux, and welding current is 630~660A, welding
Voltage is 29~31V, and weldering speed is 360~400 mm/min, and when welding is welded using the welding method of multilayer multiple tracks；
(4) steel plate is turned over, in wide-angle groove side gouge back chipping, uses diameter for the carbon-point of 5mm, carry out carbon arc air gouging, plane
Groove depth and width keep uniformity, and root should have the circular arc of R=6mm, root face all be excluded, and will modify surface, use
Simultaneously remove carburized layer in angular sander finishing surface；
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, groove welding is expired, welded
Heat input control is connect in 30~35KJ/cm, welding welding material is welding wire for submerged-arc welding, and diameter 4.0mm matches SJ105Q solder flux, weldering
Connecing electric current is 630~660A, and weldingvoltage is 29~31V, and weldering speed is 360~400 mm/min；Multilayer multiple tracks is used when welding
Welding method welded；
(6) it after the completion of welding, is kept the temperature using heat-preservation cotton, slow cooling to room temperature, avoids hardening since cooling velocity comparatively fast generates
Tissue.
When carrying out multi-layer multi-pass welding using Lincoln weld, 140~180 DEG C of steel billet temperature are kept between road.
For welding point through visual examination and non-destructive testing, presentation quality is all satisfied 4.9.12 in Q/CR 9211-2015
Requirement, internal soundness meets I grade of level weld seam requirement in Q/CR 9211-2015.
Backing weld seam is welded using solid welding wire, solid welding wire chemical component and weight percent are as follows:
C 0.071%,
Mn 1.6%,
Si 0.57%,
S 0.003%,
P 0.013%,
Cr 0.34%,
Ni 1.03%,
Cu 0.23%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO220%,
Ar 80%, gas purity >=99.9%.
The welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.09%,
Mn 1.97%,
Si 0.06%,
P 0.012%,
S 0.005%,
Mo 0.28%,
Ni 0.98%,
Cr 0.28%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 4.0mm, and solder flux SJ105q, solder flux baking temperature is 350 DEG C, baking time 2h.
Embodiment 2
Q370qE the and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method of plate thickness 50mm successively includes
Following steps:
It (1) is respectively two blocks of steel plates of Q370qE and Q690qE to finished edge two-sided at spelling, the two-sided entirety of groove in material
In X-type；Side low-angle bevel angle is 31 °, and other side wide-angle bevel angle is 41 °, root face 2.5mm；The small angle
The depth ratio of the depth and wide-angle groove of spending groove is 2.5:1；
(2) low-angle groove side is first welded in using gas shield and carries out welding 3, backing weld seam is formed, by steel plate before welding
Preheating temperature is as 70~80 DEG C；
(3) after the completion of backing weld seam, sweating heat makes the temperature of steel plate be promoted to 115~155 DEG C, in low-angle groove the same side
Welding groove is welded completely using Lincoln weld, thermal weld stress is controlled in 30~35KJ/cm, using the welding side of multilayer multiple tracks
Method is welded；Before low-angle groove side is using submerged arc welding, control steel billet temperature carries out submerged arc when being 150 ± 5 DEG C
Welding；
(4) steel plate is turned over, carbon arc air gouging is carried out to wide-angle groove side, channeling depth and width keep uniform one
It causes, processes the circular arc of R=8mm in the root of wide-angle groove, root face is all excluded, modify wide-angle groove side surface,
Remove carburized layer；
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, groove welding is expired, welded
Heat input control is connect in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks；
(6) Insulation is taken after the completion of welding, the heat preservation of covering and heat insulating cotton slowly cools to room temperature.
Backing weld seam is welded using solid welding wire, solid welding wire chemical component and weight percent are as follows:
C 0.070%,
Mn 1.7%,
Si 0.55%,
S 0.035%,
P 0.012%,
Cr 0.34%,
Ni 1.01%,
Cu 0.25%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO222%,
Ar 78%。
Gas purity >=99.9%.
The welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.085%,
Mn 1.99%,
Si 0.05%,
P 0.014%,
S 0.0045%,
Mo 0.30%,
Ni 0.96%,
Cr 0.3%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 4.2mm, and solder flux SJ105q, solder flux baking temperature is 350 ± 10 DEG C, baking time 2.5h.
Submerged arc welding electric current is 630~660A, and weldingvoltage is 29~31V, and weldering speed is 360~400 mm/min.Solid welding wire is straight
Diameter is 1.2mm, and welding current is 240~260A, and weldingvoltage is 25~28V, and weldering speed is 280~320 mm/min.
Test piece for welding ultrasonic examination is qualified.Welding point is through detecting, mechanical property: the tensile strength of welding point is
574MPa breaks in the side low material Q370qE, elongation after fracture 24.5；Three area maximum hardness HV10 of welding point is 345；Weldering
Stitching -40 DEG C of cold impact values is respectively 114J, 121J, 111J；- 40 DEG C of the heat affected area in the side Q370qE cold impact value is respectively
203J, 224J, 236J；- 40 DEG C of the heat affected area in the side Q690qE cold impact value is respectively 208J, 177J, 159J；Half-and-half joint is curved
Song test does not find crackle；Plate face is smooth, and part is without buckling deformation.
The present invention has chosen suitable welding material combination, and compound using solid welding wire mixed gas arc welding and submerged-arc welding
Welding method, Q370qE and Q690qE varying strength welding point is welded, beautiful appearance outside weld seam, inside weld seam
Reliable performance, weldquality are stablized.For welding point through visual examination and non-destructive testing, presentation quality is all satisfied Q/CR 9211-
The requirement of 4.9.12 in 2015, internal soundness meet I grade of level weld seam requirement in Q/CR 9211-2015.Welding point tensile strength
For 550-570MPa, bond pull fracture and low material base material side, joint welding and -40 DEG C of heat affected area low-temperature impact work exist
111~246J, welding point low-temperature flexibility have more rich deposit, meet the requirement of standard and design.
Embodiment 3
Q370qE the and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method of plate thickness 50mm successively includes
Following steps:
It (1) is respectively two blocks of steel plates of Q370qE and Q690qE to finished edge two-sided at spelling, the two-sided entirety of groove in material
In X-type；Side low-angle bevel angle is 29 °~31 °, and other side wide-angle bevel angle is 39 °~41 °, and root face is
2.5mm；The depth of the low-angle groove and the depth ratio of wide-angle groove are 2.5:1；
(2) low-angle groove side is first welded in using gas shield and carries out welding 3, backing weld seam is formed, by steel plate before welding
Preheating temperature is as 70~80 DEG C；
(3) after the completion of backing weld seam, sweating heat makes the temperature of steel plate be promoted to 115~155 DEG C, in low-angle groove the same side
Welding groove is welded completely using Lincoln weld, thermal weld stress is controlled in 30~35KJ/cm, using the welding method of multilayer multiple tracks
It is welded；Before low-angle groove side is using submerged arc welding, control steel billet temperature carries out submerged arc welding when being 150 ± 5 DEG C；
(4) steel plate is turned over, carbon arc air gouging is carried out to wide-angle groove side, channeling depth and width keep uniform one
It causes, processes the circular arc of R=8mm in the root of wide-angle groove, root face is all excluded, modify wide-angle groove side surface,
Remove carburized layer；
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, groove welding is expired, welded
Heat input control is connect in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks；
(6) Insulation is taken after the completion of welding, the heat preservation of covering and heat insulating cotton slowly cools to room temperature.
Backing weld seam is welded using solid welding wire, solid welding wire chemical component and weight percent are as follows:
C 0.72%,
Mn 1.5%,
Si 0.59%,
S 0.0025%,
P 0.014%,
Cr 0.32%,
Ni 1.05%,
Cu 0.21%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO218%,
Ar 82%。
Gas purity >=99.9%.
The welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.095%,
Mn 1.95%,
Si 0.07%,
P 0.01%,
S 0.0055%,
Mo 0.26%,
Ni 1%,
Cr 0.26%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 3.8mm, and solder flux SJ105q, solder flux baking temperature is 350 ± 10 DEG C, baking time 1.5h.
Submerged arc welding electric current is 630~660A, and weldingvoltage is 29~31V, and weldering speed is 360~400 mm/min.Solid welding wire is straight
Diameter is 1.2mm, and welding current is 240~260A, and weldingvoltage is 25~28V, and weldering speed is 280~320 mm/min.
For welding point through visual examination and non-destructive testing, presentation quality is all satisfied 4.9.12 in Q/CR 9211-2015
Requirement, internal soundness meets I grade of level weld seam requirement in Q/CR 9211-2015.
Embodiment 4
Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method successively carries out as follows:
It (1) is respectively two blocks of steel plates of Q370qE and Q690qE to finished edge two-sided at spelling, the two-sided entirety of groove in material
In X-type；Side low-angle bevel angle be 29 °~31 °, other side wide-angle bevel angle be 39 °~41 °, root face be 1.5~
2.5mm；The depth of the low-angle groove and the depth ratio of wide-angle groove are (2~2.5): 1；
(2) low-angle groove side is first welded in using gas shield and carries out welding 2~4, backing weld seam is formed, by steel before welding
Plate preheating temperature is as 70~80 DEG C；
(3) after the completion of backing weld seam, the temperature of steel plate is promoted to 115~155 DEG C, uses submerged arc certainly in low-angle groove the same side
Dynamic weldering welds welding groove completely, and thermal weld stress is controlled in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks；
(4) steel plate is turned over, carbon arc air gouging is carried out to wide-angle groove side, channeling depth and width keep uniform one
It causes, processes 8mm >=R >=6mm circular arc in the root of wide-angle groove, root face is all excluded, modify wide-angle groove one
Carburized layer is removed in side surface；
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, groove welding is expired, welded
Heat input control is connect in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks；
(6) Insulation is taken after the completion of welding, the heat preservation of covering and heat insulating cotton slowly cools to room temperature.
To prevent crackle from generating, before low-angle groove side is using submerged arc welding, as plate thickness δ < 32mm, control
Steel billet temperature is 100 ± 5 DEG C；When plate thickness 32≤δ < 50mm, control steel billet temperature is 120 ± 5 DEG C；When plate thickness δ >=50mm, control
Steel billet temperature processed is 150 ± 5 DEG C.
When the steel plate thickness welded is 32~50mm, backing weld seam welding 3.
Backing weld seam is welded using solid welding wire, solid welding wire chemical component and weight percent are as follows:
C 0.070~0.72%,
Mn 1.5~1.7%,
Si 0.55~0.59%,
S 0.0025~0.035%,
P 0.012~0.014%,
Cr 0.32~0.34%,
Ni 1.01~1.05%,
Cu 0.21~0.25%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO218~22%,
Ar 78~82%.
5, a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint according to claim 3 is multiple
Close welding method, which is characterized in that the diameter of the solid welding wire is 1.2~1.8mm.
The welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.085~0.095%,
Mn 1.95~1.99%,
Si 0.05~0.07%,
P 0.01~0.014%,
S 0.0045~0.0055%,
Mo 0.26~0.30%,
Ni 0.96~1%,
Cr 0.26~0.3%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 3.8~4.2mm, and solder flux SJ105q, solder flux baking temperature is 350 ± 10 DEG C, and baking time is
1.5~2.5h.
When carrying out multi-layer multi-pass welding using Lincoln weld, 140~180 DEG C of steel billet temperature are kept between road.
The present invention is not limited to the above embodiments, on the basis of technical solution disclosed by the invention, the skill of this field
For art personnel according to disclosed technology contents, one can be made to some of which technical characteristic by not needing creative labor
A little replacements and deformation, these replacements and deformation are within the scope of the invention.
Claims (10)
1. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint complex welding method, which is characterized in that
It in turn includes the following steps:
It (1) is respectively two blocks of steel plates of Q370qE and Q690qE to finished edge two-sided at spelling, the two-sided entirety of groove in material
In X-type；Side low-angle bevel angle be 29 °~31 °, other side wide-angle bevel angle be 39 °~41 °, root face be 1.5~
2.5mm；The depth of the low-angle groove and the depth ratio of wide-angle groove are (2~2.5): 1；
(2) low-angle groove side is first welded in using gas shield and carries out welding 2~4, backing weld seam is formed, by steel before welding
Plate preheating temperature is as 70~80 DEG C；
(3) after the completion of backing weld seam, the temperature of steel plate is promoted to 115~155 DEG C, uses submerged arc certainly in low-angle groove the same side
Dynamic weldering welds welding groove completely, and thermal weld stress is controlled in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks
It connects；
(4) steel plate is turned over, carbon arc air gouging is carried out to wide-angle groove side, channeling depth and width keep uniform one
It causes, processes 8mm >=R >=6mm circular arc in the root of wide-angle groove, root face is all excluded, modify wide-angle groove one
Carburized layer is removed in side surface；
(5) 150~200 DEG C of steel billet temperature are kept, is welded in wide-angle groove side using Lincoln weld, groove welding is expired, welded
Heat input control is connect in 30~35KJ/cm, is welded using the welding method of multilayer multiple tracks；
(6) Insulation is taken after the completion of welding, the heat preservation of covering and heat insulating cotton slowly cools to room temperature.
2. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint Combined Welding according to claim 1
Connect method, which is characterized in that prevent crackle from generating, before low-angle groove side is using submerged arc welding, as plate thickness δ <
When 32mm, control steel billet temperature is 100 ± 5 DEG C；When plate thickness 32≤δ < 50mm, control steel billet temperature is 120 ± 5 DEG C；Plate thickness δ
When >=50mm, control steel billet temperature is 150 ± 5 DEG C.
3. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint Combined Welding according to claim 1
Connect method, which is characterized in that the steel plate thickness welded is 32~50mm, backing weld seam welding 3.
4. a kind of Q370qE and Q690qE structural steel for bridge varying strength pair according to any one of claims 1 to 3
Spelling joint complex welding method, which is characterized in that backing weld seam is welded using solid welding wire, solid welding wire chemical component and
Weight percent are as follows:
C 0.070~0.72%,
Mn 1.5~1.7%,
Si 0.55~0.59%,
S 0.0025~0.035%,
P 0.012~0.014%,
Cr 0.32~0.34%,
Ni 1.01~1.05%,
Cu 0.21~0.25%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO218~22%,
Ar 78~82%.
5. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint Combined Welding according to claim 4
Connect method, which is characterized in that backing weld seam is welded using solid welding wire, solid welding wire chemical component and weight percent
Are as follows:
C 0.071%,
Mn 1.6%,
Si 0.57%,
S 0.003%,
P 0.013%,
Cr 0.34%,
Ni 1.03%,
Cu 0.23%,
Surplus is Fe；
The component and percent by volume of the protective gas of use are as follows:
CO220%,
Ar 80%, gas purity >=99.9%.
6. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint Combined Welding according to claim 4
Connect method, which is characterized in that the diameter of the solid welding wire is 1.2~1.8mm.
7. a kind of Q370qE and Q690qE structural steel for bridge varying strength pair according to any one of claims 1 to 3
Spelling joint complex welding method, which is characterized in that the welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.085~0.095%,
Mn 1.95~1.99%,
Si 0.05~0.07%,
P 0.01~0.014%,
S 0.0045~0.0055%,
Mo 0.26~0.30%,
Ni 0.96~1%,
Cr 0.26~0.3%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 3.8~4.2mm, and solder flux SJ105q, solder flux baking temperature is 350 ± 10 DEG C, and baking time is
1.5~2.5h.
8. a kind of Q370qE and Q690qE structural steel for bridge varying strength half-and-half joint Combined Welding according to claim 7
Connect method, which is characterized in that the welding wire for submerged-arc welding chemical component and weight percent that Lincoln weld uses are as follows:
C 0.09%,
Mn 1.97%,
Si 0.06%,
P 0.012%,
S 0.005%,
Mo 0.28%,
Ni 0.98%,
Cr 0.28%,
Surplus is Fe,
Welding wire for submerged-arc welding diameter is 4.0, solder flux SJ105q, and solder flux baking temperature is 350 DEG C, baking time 2h.
9. a kind of Q370qE and Q690qE structural steel for bridge varying strength pair according to any one of claims 1 to 3
Spelling joint complex welding method, which is characterized in that when carrying out multi-layer multi-pass welding using Lincoln weld, steel plate temperature is kept between road
140~180 DEG C of degree.
10. a kind of Q370qE and Q690qE structural steel for bridge varying strength pair according to any one of claims 1 to 3
Spelling joint complex welding method, which is characterized in that heated when preheating steel plate using electromagnetic induction heating device.
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| CN115519216A (en) * | 2022-09-21 | 2022-12-27 | 中铁宝桥（扬州）有限公司 | Method for controlling welding deformation of open type large-scale steel tower block with asymmetric cross section |
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