CN106425041B - Welding method of the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead - Google Patents
Welding method of the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead Download PDFInfo
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- CN106425041B CN106425041B CN201510493572.2A CN201510493572A CN106425041B CN 106425041 B CN106425041 B CN 106425041B CN 201510493572 A CN201510493572 A CN 201510493572A CN 106425041 B CN106425041 B CN 106425041B
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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
- B23K9/167—Arc welding or cutting making use of shielding gas and of a non-consumable electrode
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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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- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
- Arc Welding In General (AREA)
Abstract
The present invention provides a kind of LNG low-temperature storage tank 9%Ni steel loop to the welding method of docking welding bead, which comprises the steps of: S100, narrow gap butting grooves of the design with root face, the butting grooves are the butting grooves of X-type；S200, single layer backing welding, bottom reinforcement weldering, filling weldering, cosmetic welding are successively carried out using high frequency heated filament TIG weld method.The welding method passes through design slope type, select root bead and filling cover welding technique, overcome that the welding efficiency of the prior art is low, welding material expenditure is big, welding bead defect is more, property of welded joint is poor, is required to welder's operative skill, which has the characteristics that welding efficiency is high, welding bead is high-quality, property of welded joint is excellent the disadvantages of high.
Description
Technical field
The present invention is suitable for carrying out vertical position welding using narrow gap high frequency heated filament TIG method, and material is the LNG low temperature of 9%Ni steel
Storage tank, tank volume are 3~16 × 106m3。
Background technique
9%Ni steel is the mild steel that ni content is 9%, and minimum reachable -196 DEG C using temperature, be a kind of low-carbon quenched and tempered steel,
Tissue is martensite and bainite, and this steel has broad prospects in LNG low-temperature storage tank field, is manufacture LNG refrigerated storage tank
Main material.The welding of 9%Ni steel is the important link of LNG storage tank construction, the especially welding of the circumference weld of LNG storage tank
Quality directly influences the safety of storage tank military service.
Currently, the method that the welding of LNG storage tank circumference weld mainly uses has: the first is stick electrode arc welding, this
Method has the advantages that flexible operation, simple and easy to do, adaptable.But its welding efficiency is low, and the requirement to welder is high, welder
Technical level welding quality influence it is big, and large labor intensity, personnel cost is high.Second of hand tungsten argon arc welding, this
Kind method can guarantee that welding point has high quality, and this method can control the feeding speed of welding current and welding wire respectively,
It is easy to control dilution rate and obtains satisfied weld bead shape, but its welding efficiency is extremely low, the technical level of welder is to welding matter
The influence of amount is big.The third is flux-cored wire gas metal-arc welding, and this welding method deposition rate is big, high-efficient, main
Wanting problem is to be easy to produce lack of fusion and stomata, and the low-temperature flexibility of welding point is poor, and welding wire relies on import, welding cost
It is high.4th kind is submerged-arc horizontal, and this welding method generallys use Φ 1.6mm welding wire for submerged-arc welding, and deposition rate is big, high-efficient, but
It is that welding sequence is more complex, needs largely to polish.
In the implementation of the present invention, inventor has found that existing LNG low-temperature storage tank circumference weld welding technique is at least deposited
In following problems: first, existing welding method is all manual welding, and welding efficiency is very low, in actual welding construction, is needed
A large amount of exper ienced welders, labor cost are very high；Second, using existing welding method, the consistency of welding point is difficult to
Guarantee, generation welding defect probability is big, and welding point low-temperature flexibility is poor；Third, 9%Ni steel circumference weld is different steel weld,
It needs using biggish groove type, to improve welding penetration ratio, wlding consumption is big；4th, using existing welding method, need
Welding bead back gouging is carried out, welding bead surface needs to polish.
Summary of the invention
In order to solve the problems, such as existing welding technique, the present invention provides a kind of LNG low-temperature storage tank 9%Ni steel loops to docking
The welding method of welding bead, for LNG low-temperature storage tank 9%Ni steel loop to docking welding bead narrow gap high frequency heated filament TIG weld.The weldering
Connect method by design slope type, select root bead and filling cover welding technique, overcome the welding efficiency of the prior art it is low, weldering
Connect the disadvantages of high material consumption, welding bead defect is more, property of welded joint is poor, high to the requirement of welder's operative skill.The welding method
Have the characteristics that welding efficiency is high, welding bead is high-quality, property of welded joint is excellent.
In order to achieve the above object, LNG low-temperature storage tank 9%Ni steel loop of the present invention to docking welding bead welding side
Method includes the following steps:
S100, narrow gap butting grooves of the design with root face, the butting grooves are the butting grooves of X-type, the docking
The root face gap of groove is 0mm, and the root face heights of the butting grooves is 1.5~2.0mm, the butting grooves angle is 3~
5 °, the butting grooves bottom chamfer is 3~5mm.
S200, single layer backing welding, bottom reinforcement weldering, filling weldering, capping are successively carried out using high frequency heated filament TIG weld method
Weldering.
Described stands for LNG low-temperature storage tank 9%Ni steel to butt welding pipeline narrow gap high frequency heated filament TIG weld method, institute
It states in step S200, the base value welding current that the single layer backing welding welding uses is 220A, pulse frequency 200Hz, peak value weldering
Meet electric current 260A, pulse frequency 200Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, wire feed rate 3000~
3500mm/min, heater current 30A.
Welding method of the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead, which is characterized in that the step
In S200, the base value welding current that the filling weldering uses is 260A, pulse frequency 250Hz, peak value welding current 330A, pulse
Frequency 250Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, 3000~3500mm/min of wire feed rate, heated filament electricity
Stream is 30A.
Welding method from the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead, in the step S200, the lid
The base value welding current that face weldering uses is 260A, pulse frequency 250Hz, peak value welding current 330A, pulse frequency 250Hz, weldering
Meet voltage 11V, 140~150mm/min of speed of welding, 3000~3500mm/min of wire feed rate, heater current 30A.
Welding method from the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead, in the step S200, the list
Layer backing welding, bottom reinforce weldering, filling is welded, cosmetic welding is all made of the direct current source of welding current and direct current heater supply.
The LNG low-temperature storage tank 9%Ni steel loop carries out the step S200 operation to the welding method of docking welding bead
When, wire feeding mouth and workpiece angle are 30 °~35 °, and narrow gap welding torque is the vertical workpiece direction.
The LNG low-temperature storage tank 9%Ni steel loop carries out the step S200 operation to the welding method of docking welding bead
When, the protection gas Ar flow being passed through is 15~30L/min.
The present invention can effectively control welding deformation, avoid HOT CRACK FOR WELDING P, weld arc blow, welding point cryomechanics
Functional, the present invention has the advantage that
(1) welding procedure invented realizes the narrow gap heat of LNG low-temperature storage tank 9%Ni steel plate circumferential direction docking welding bead
Silk TIG weld, welding process are stablized.
(2) thermal weld stress amount is small, welding bead is narrow and smooth and beautiful appearance.
(3) it according to JB/T4730.1~6-2005 " bearing device non-destructive testing ", detects a flaw I grade of grade, it is close to save wlding
60%；
(4) -196 DEG C of welding point CTOD average values are 0.65mm.
Below in conjunction with the drawings and specific embodiments, the present invention will be described in detail, but not as a limitation of the invention.
Detailed description of the invention
Fig. 1 is the butting grooves dimensional structure schematic diagram of one embodiment of the invention.
Fig. 2 is the layer distribution schematic diagram of one embodiment of the invention.
Specific embodiment
Structural principle and working principle of the invention are described in detail with reference to the accompanying drawing:
A kind of LNG low-temperature storage tank 9%Ni steel loop provided by the invention including walks as follows to the welding method of docking welding bead
It is rapid:
S100, narrow gap butting grooves of the design with root face, the butting grooves are the butting grooves of X-type；The docking
The root face gap of groove is 0mm, and the root face heights of the butting grooves is 1.5~2.0mm, the butting grooves angle is 3~
5 °, the butting grooves bottom chamfer is 3~5mm.
S200, single layer backing welding, bottom reinforcement weldering, filling weldering, lid are successively carried out using high frequency heated filament TIG weld method
Face weldering.
In detail it, in step S200, the base value welding current that uses of single layer backing welding welding is 220A, pulse frequency
200Hz, peak value welding current 260A, pulse frequency 200Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, wire feed
3000~3500mm/min of speed, heater current 30A.
In step S200, the base value welding current that filling weldering uses is 260A, pulse frequency 250Hz, peak value welding current
330A, pulse frequency 250Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, 3000~3500mm/ of wire feed rate
Min, heater current 30A.
In step S200, the base value welding current that cosmetic welding uses is 260A, pulse frequency 250Hz, peak value welding current
330A, pulse frequency 250Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, 3000~3500mm/ of wire feed rate
Min, heater current 30A.
In step S200, the single layer backing welding, bottom reinforce weldering, filling is welded, cosmetic welding is all made of the direct current source of welding current
With direct current heater supply.
When carrying out step S200 operation, using the high power DC source of welding current, direct current heater supply selects the diameter to be
1.0mm, the trade mark are the welding wire of Inconel625.Narrow gap welding torque is vertical workpiece direction, wire feeding mouth and workpiece angle be 30 °~
35 °, protection gas Ar flow is 15~30L/min.
To further describe welding method of the LNG low-temperature storage tank 9%Ni steel loop to docking welding bead, spy lifts following examples.
As shown in Figure 1,32mm is thick, a pair of of X7Ni9 plate transverse direction butt welding test plate (panel) of 300mm long, 150mm wide, groove X
Type, test plate (panel) thickness δ are 32mm, the long 300mm of test plate (panel), and the wide 150mm of test plate (panel), root face gap b is 0mm, root face height p is 1.5mm, groove
Angle beta is 3 °, bottom chamfer R is 3mm, a=1mm, S=4mm, wherein S=R+a.
Test plate (panel) is first pressed into above-mentioned specifications design, Fig. 2 is shown in specific welding number of plies distribution.The welding parameter that welding process uses is such as
Shown in table 1, table 2.
1 bottom welding technological parameter of table
Table 2 fills capping technological parameter
Narrow gap welding torque is vertical workpiece direction, and wire feeding mouth and workpiece angle are 30 ° ± 2 °
Postwelding, according to according to JB/T4730.1~6-2005 " bearing device non-destructive testing ", is detected a flaw I grade of grade, is pressed to test plate (panel)
NB/T47014-2011 carries out buckling test, and face-bend test, tension test, welding bead and -196 DEG C of heat affected area impact test are full
Sufficient standard requirements；- 196 DEG C of CTOD detections of welding point are carried out by GB/T21143-2007, CTOD mean value is 0.65mm.
Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe
It knows those skilled in the art and makes various corresponding changes and modifications, but these corresponding changes and change in accordance with the present invention
Shape all should fall within the scope of protection of the appended claims of the present invention.
Claims (5)
- Welding method of the 1.LNG low-temperature storage tank 9%Ni steel loop to docking welding bead, which comprises the steps of:S100, narrow gap butting grooves of the design with root face, the butting grooves are the butting grooves of X-type, the butting grooves Root face gap be 0mm, the root face heights of the butting grooves is 1.5~2.0mm, and the butting grooves angle is 3~5 °, institute Stating butting grooves bottom chamfer is 3~5mm；S200, single layer backing welding, bottom reinforcement weldering, filling weldering, cosmetic welding are successively carried out using high frequency heated filament TIG weld method, In the step S200, the base value welding current that the single layer backing welding welding uses is 220A, pulse frequency 200Hz, peak value Welding current 260A, pulse frequency 200Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, wire feed rate 3000~ 3500mm/min, heater current 30A；In the step S200, the base value welding current that the filling weldering uses is 260A, pulse frequency 250Hz, peak value welding Electric current 330A, pulse frequency 250Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, wire feed rate 3000~ 3500mm/min, heater current 30A；In the step S200, the base value welding current that the cosmetic welding uses is 260A, pulse frequency 250Hz, peak value welding Electric current 330A, pulse frequency 250Hz, weldingvoltage 11V, 140~150mm/min of speed of welding, wire feed rate 3000~ 3500mm/min, heater current 30A.
- 2. LNG low-temperature storage tank 9%Ni steel loop as described in claim 1 to docking welding bead welding method, which is characterized in that into When row step S200 operation, wire feeding mouth and workpiece angle are 30 °~35 °, and narrow gap welding torque is the vertical workpiece direction.
- 3. LNG low-temperature storage tank 9%Ni steel loop as described in claim 1 to docking welding bead welding method, which is characterized in that into When row step S200 operation, the protection gas Ar flow being passed through is 15~30L/min.
- 4. LNG low-temperature storage tank 9%Ni steel loop as described in claim 1 to docking welding bead welding method, which is characterized in that into When row step S200 operation, selection diameter is 1.0mm, and the trade mark is the welding wire of Inconel625.
- 5. LNG low-temperature storage tank 9%Ni steel loop as described in claim 1 to docking welding bead welding method, which is characterized in that institute State single layer backing welding, weldering is reinforced in bottom, filling is welded, the thickness of cosmetic welding is respectively 3mm.
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| CN112809135B (en) * | 2021-01-15 | 2021-09-14 | 广东福维德焊接股份有限公司 | Automatic efficient deep-melting argon arc welding process for 9Ni steel |
| CN116174864A (en) * | 2022-12-12 | 2023-05-30 | 南京奥特自动化有限公司 | LNG Rapid-TIG vertical welding process |
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