CN105643061B - For the CO of superhigh intensity steel plate2The welding method of gas shielded arc welding - Google Patents
For the CO of superhigh intensity steel plate2The welding method of gas shielded arc welding Download PDFInfo
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- CN105643061B CN105643061B CN201610127782.4A CN201610127782A CN105643061B CN 105643061 B CN105643061 B CN 105643061B CN 201610127782 A CN201610127782 A CN 201610127782A CN 105643061 B CN105643061 B CN 105643061B
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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
- B23K9/16—Arc welding or cutting making use of shielding gas
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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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- Plasma & Fusion (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention relates to a kind of CO for superhigh intensity steel plate2The welding method of gas shielded arc welding.Its technical solution is：First to the superhigh intensity steel plate finished edge to be welded after blanking, groove is asymmetric X-type, then using CO2Gas-shield welding method carries out prime coat welding and filled layer welding successively, and then weld seam using ultrasonic wave is carried out non-destructive testing and Welded Joints carry out mechanics properties testing.The prime coat welding is welded using 500 ~ 600MPa grades of welding wire, and the thickness of prime coat is 2 ~ 8mm；The filled layer welding is welded using welding wire equicohesive with base material.The superhigh intensity steel plate to be welded is the steel plate that intensity is 890MPa grades or more and thickness is 25 ~ 30mm.The present invention have the characteristics that simple for process, artificial intensity is small, welding cost is low and welding efficiency is high, the welding point which is formed obtains good comprehensive mechanical property, be suitable for 890MPa and more than the big thick plate structure steel of superhigh intensity.
Description
Technical field
The invention belongs to CO2Gas shielded arc welding technical field.More particularly to a kind of CO for superhigh intensity steel plate2Gas
The welding method of body protection weldering.
Background technology
In recent years, structural steel constantly develops towards the direction of superhigh intensity, big structure, intensity reach 890MPa grades or more and
Thickness is at 25mm grades or more, and to meet large-size chemical container, petroleum pipeline, thermoelectricity, nuclear power pressure pipeline, ship, ocean are put down
The requirement of the large-scale components such as platform and engineering machinery.
This kind of high-performance steel iron material usually higher alloy content of addition, such as C, Mn, Cr, Mo and Ni is strong to ensure
Degree, toughness, fatigue and the performances such as corrosion-resistant, and high alloy content also directly enhances the carbon equivalent of material（Ceq）And cold crack
Sensitivity coefficient（Pcm）, difficulty is brought to subsequent welding processing.Therefore, it in the big slab of this kind of superhigh intensity of welding, needs to weld
Preceding preheating, control interlayer temperature and postheating, cold crack, the tissue for ensureing welding heat affected zone and reduction is reduced or avoided
Welding stress.Preheating in Welding is generally carried out using oxy-acetylene flame heating, annealing stove heat or cladding crawler type heating tape
Heating controls temperature >=100 ~ 150 DEG C, heat preservation a period of time.It is after one of weld seam has been welded to control interlayer temperature process, is added
Or cooling equipment is not added with, weld seam is cooled to 100 ~ 150 DEG C, then carry out down one of weld seam.Postheating technique is to weld
It is slowly cooled to room temperature into rear using thermal insulation material clad welded connector.These processes need to heat or Slow cooling is set
Standby and device, increases the complexity of technique, improves welding labor intensity, simultaneously the time that control is needed to heat and cool down
Cost of labor is also increased, the result is that improving construction period and the cost of entire engineering.
Invention content
The present invention is directed to overcome the deficiencies in the prior art, it is therefore an objective to which offer one kind is simple for process, labor intensity is small, is welded into
This low and high CO for superhigh intensity steel plate of welding efficiency2The welding method of gas shielded arc welding, the welding method institute shape
Into welding point comprehensive mechanical property it is good.
To achieve the above object, the technical solution adopted by the present invention：First to the superhigh intensity thickness steel to be welded after blanking
Plate finished edge, groove are asymmetric X-type, then using CO2Gas-shield welding method carries out prime coat welding and filling successively
Layer welding, is then carried out non-destructive testing weld seam using ultrasonic wave and Welded Joints carry out mechanics properties testing.
The prime coat welding is welded using 500 ~ 600MPa grades of welding wire, and the thickness of prime coat is 2 ~ 8mm；The filling
Layer welding is welded using welding wire equicohesive with base material.
The superhigh intensity steel plate to be welded is the steel plate that intensity is 890MPa grades or more and thickness is 25 ~ 30mm.
The technical parameter of the welding is：Welding current is 260 ~ 270A, and arc voltage is 29 ~ 30V, and speed of welding is
300 ~ 380mm/min, protective gas 80vol.%Ar+20vol.%CO2, gas flow is 15 ~ 20L/min.
By adopting the above-described technical solution, compared with prior art, the present invention with following good effect：
The present invention uses 500 ~ 600MPa grades of welding wire to carry out prime coat welding, and bottoming layer thickness is 2 ~ 8mm, is welded
890MPa grades or more of superhigh intensity slab using the thermal weld stress of 15 ~ 18kJ/cm, does not preheat, interlayer temperature is not controlled before weldering
System, postwelding do not need to slow cooling, and welding procedure is simple.
The prime coat welding of the present invention is the CO using 500 ~ 600MPa grades2Gas protecting welding wire, since welding wire intensity is remote
Far below base material, the alloy content in chemical system is also less than base material, thus carbon equivalent and cold crack sensitivity coefficient are below
In the case of without weld preheating, not needing to interlayer temperature control and not needing to slow cooling, cold crack will not occur for base material,
Therefore it is simple for process, labor intensity is small, welding cost is low and welding efficiency is high.
The thickness of prime coat of the present invention is 2 ~ 8mm, controls the angular deformation of structural member well, it is therefore prevented that filler pass
Burn phenomenon.
The weld seam formed to the present invention is carried out non-destructive testing with ultrasonic wave and the Mechanics Performance Testing of Welded Joints：Nothing
Damage flaw detection 100% is qualified；Welding point tensile strength is 941 ~ 982MPa, and the welding point formed has comparable with base material
Tensile strength, -20 DEG C of impact flexibility average values of weld metal are 89J ~ 104J, i.e., with good impact flexibility, are suitable for
The welding of 890MPa grades or more of large-sized structural parts.
Therefore, the present invention have it is simple for process, do not need to additional heating or cooling device or device, can reduce it is artificial strong
Degree reduces the characteristics of welding cost and raising welding efficiency, and the welding point which is formed obtains good comprehensive
Mechanical property is closed, tensile strength is kept not reduce, the impact flexibility of weld metal is improved instead, particularly suitable for 890MPa
And the above big thick plate structure steel of superhigh intensity.
Description of the drawings
Fig. 1 is a kind of schematic diagram of asymmetry X-groove of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and detailed description, not to the limit of this its protection domain
System.
To avoid repeating, the technical parameter Unify legislation for first welding present embodiment is as follows：Welding current is 260
~ 270A, arc voltage are 29 ~ 30V, and speed of welding is 300 ~ 380mm/min, protective gas 80vol.%Ar+20vol.%
CO2, gas flow is 15 ~ 20L/min.It is repeated no more in embodiment.
Embodiment 1
A kind of CO for superhigh intensity steel plate2The welding method of gas shielded arc welding.First to be welded after blanking
Superhigh intensity steel plate finished edge, as shown in Figure 1, groove is asymmetric X-type, the angle of groove is 60 °, the thickness of upper groove
2/3 for the steel plate thickness.CO is used again2Gas-shield welding method carries out prime coat welding and filled layer welding successively, so
Weld seam using ultrasonic wave is carried out non-destructive testing afterwards and Welded Joints carry out mechanics properties testing.It is not required to before the present embodiment welding
Preheat, weld in do not need to control interlayer temperature and postwelding do not need to slow cooling.
Prime coat welding is using 500MPa grades of welding wire ER50-6, gage of wire 1.2mm, prime coat described in the present embodiment
Thickness is 5 ~ 8mm；The filled layer welding uses 900MPa grades of welding wire BHG-5, gage of wire 1.2mm.
Superhigh intensity steel plate to be welded described in the present embodiment is Q890, and chemical constituent is as shown in table 1, and surrender is strong
It spends for 890MPa, tensile strength is 940 ~ 1100MPa, and -20 DEG C of notched bar impact strengths are >=34J.Steel plate thickness is 30mm.
The chemical composition of 1 Q890 steel plates of table
| C | Si | Mn | S | P | Cr+Ni+Mo | Nb+V+Ti | B | Al | |
| Q890 | 0.087 | 0.27 | 1.64 | 0.002 | 0.009 | 0.99 | 0.094 | 0.0014 | 0.039 |
The weld seam formed to the present embodiment is carried out non-destructive testing with ultrasonic wave and the Mechanics Performance Testing of Welded Joints,
As a result it is as follows：Nondestructive inspection 100% is qualified；Welding point tensile strength be 941 ~ 955MPa, -20 DEG C of impact flexibility of weld metal
Average value is 104J, and test result shows：Using the prime coat welding described in the present embodiment using 500MPa welding wires, through 12 ~
The CO of 16kJ/cm heat inputs2Gas shield postwelding, welding point and weld metal performance fully meet 890MPa grades of large size
The high intensity technology requirement of component, and with good impact flexibility.
Embodiment 2
A kind of CO for superhigh intensity steel plate2The welding method of gas shielded arc welding.First to be welded after blanking
Superhigh intensity steel plate finished edge, as shown in Figure 1, groove is asymmetric X-type, the angle of groove is 60 °, the thickness of upper groove
2/3 for the steel plate thickness.CO is used again2Gas-shield welding method carries out prime coat welding and filled layer welding successively, so
Weld seam using ultrasonic wave is carried out non-destructive testing afterwards and Welded Joints carry out mechanics properties testing.It is not required to before the present embodiment welding
Preheat, weld in do not need to control interlayer temperature and postwelding do not need to slow cooling.
Prime coat welding is using 600MPa grades of welding wire ER60-6, gage of wire 1.2mm, prime coat described in the present embodiment
Thickness is 2 ~ 5mm；Using 1000MPa grades of welding wire FK1000, gage of wire is 1.2 mm for the filled layer welding.
Superhigh intensity steel plate to be welded described in the present embodiment is Q960, and chemical constituent is as shown in table 2, and surrender is strong
It spends for 960MPa, tensile strength is 980 ~ 1150MPa, and -20 DEG C of notched bar impact strengths are >=34J.Steel plate thickness is 25mm.
The chemical composition of 2 Q960 steel plates of table
| C | Si | Mn | S | P | Cr+Ni+Mo | Nb+V+Ti | B | Al | |
| Q960 | 0.098 | 0.26 | 1.75 | 0.001 | 0.01 | 1.11 | 0.094 | 0.0016 | 0.038 |
The weld seam formed to the present embodiment is carried out non-destructive testing with ultrasonic wave and the Mechanics Performance Testing of Welded Joints,
As a result it is as follows：Nondestructive inspection 100% is qualified；Welding point tensile strength be 980 ~ 982MPa, -20 DEG C of impact flexibility of weld metal
Average value is 89J.Test result shows：Using the prime coat welding described in the present embodiment using 600MPa welding wires, through 12 ~
The CO of 16kJ/cm heat inputs2Gas shield postwelding, welding point and weld metal performance fully meet 960MPa grades of large size
The high intensity technology requirement of component, and with good impact flexibility.
Present embodiment compared with prior art, has following good effect：
Present embodiment uses 500 ~ 600MPa grades of welding wire to carry out prime coat welding, bottoming layer thickness for 2 ~
8mm, the superhigh intensity slab of 890MPa grades or more of welding using the thermal weld stress of 15 ~ 18kJ/cm, do not preheat, interlayer before weldering
Temperature does not control, and postwelding does not need to slow cooling, and welding procedure is simple.
The prime coat welding of present embodiment is the CO using 500 ~ 600MPa grades2Gas protecting welding wire, due to weldering
Silk intensity is well below base material, and alloy content in chemical system is also less than base material, thus carbon equivalent and cold crack sensitivity system
Number is below base material, in the case of without weld preheating, not needing to interlayer temperature control and not needing to slow cooling, will not occur
Cold crack, thus it is simple for process, labor intensity is small, welding cost is low and welding efficiency is high.
The thickness of present embodiment prime coat is 2 ~ 8mm, controls the angular deformation of structural member well, it is therefore prevented that fill out
Fill the burn-through phenomenon of welding bead.
The weld seam formed to present embodiment is carried out non-destructive testing with ultrasonic wave and the mechanical property of Welded Joints
It can test：Nondestructive inspection 100% is qualified；Welding point tensile strength is 941 ~ 982MPa, and the welding point formed has and mother
The comparable tensile strength of material, -20 DEG C of impact flexibility average values of weld metal are 89J ~ 104J, i.e., with good impact flexibility,
Suitable for the welding of 890MPa grades or more of large-sized structural parts.
Therefore, present embodiment have it is simple for process, do not need to additional heating or cooling device or device, can subtract
Small artificial intensity reduces the characteristics of welding cost and raising welding efficiency, and the welding point which is formed obtains
Good comprehensive mechanical property keeps tensile strength not reduce, improves the impact flexibility of weld metal instead, is particularly suitable for
In 890MPa and more than the big thick plate structure steel of superhigh intensity.
Claims (2)
1. a kind of CO for superhigh intensity steel plate2The welding method of gas shielded arc welding, it is characterised in that the welding method
It is that, first to the superhigh intensity steel plate finished edge to be welded after blanking, groove is asymmetric X-type, then using CO2Gas is protected
Shield welding method carries out prime coat welding and filled layer welding successively, then weld seam is carried out non-destructive testing using ultrasonic wave and right
Welding point carries out mechanics properties testing；
The prime coat welding is welded using 500 ~ 600MPa grades of welding wire, and the thickness of prime coat is 2 ~ 8mm；The filled layer weldering
It connects and is welded using welding wire equicohesive with base material；
The superhigh intensity steel plate to be welded is the steel plate that intensity is 890MPa grades or more and thickness is 25 ~ 30mm.
2. it to be used for the CO of superhigh intensity steel plate according to claim 12The welding method of gas shielded arc welding, it is characterised in that
The parameter of the welding is：Welding current is 260 ~ 270A, and arc voltage is 29 ~ 30V, and speed of welding is 300 ~ 380mm/min,
Protective gas is 80vol.%Ar+20vol.%CO2, gas flow is 15 ~ 20 L/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610127782.4A CN105643061B (en) | 2016-03-07 | 2016-03-07 | For the CO of superhigh intensity steel plate2The welding method of gas shielded arc welding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610127782.4A CN105643061B (en) | 2016-03-07 | 2016-03-07 | For the CO of superhigh intensity steel plate2The welding method of gas shielded arc welding |
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| CN105643061B true CN105643061B (en) | 2018-06-19 |
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| CN110153583A (en) * | 2019-05-24 | 2019-08-23 | 南京钢铁股份有限公司 | A method of improving Q890DQP steel welded joint obdurability |
| CN111945077B (en) * | 2020-07-24 | 2022-01-25 | 邯郸钢铁集团有限责任公司 | Steel Q890D for ultra-high-strength engineering machinery and production method thereof |
| CN114515890A (en) * | 2022-02-24 | 2022-05-20 | 南京钢铁股份有限公司 | Submerged-arc welding process for 890-grade ultrahigh-strength marine plate |
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| CN101733562B (en) * | 2009-12-08 | 2011-07-20 | 山东大学 | 900MPa high-strength steel preheating-free combined welding method |
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