CN104517002A - Test method for cooling crack sensitivity of pipeline girth weld - Google Patents
Test method for cooling crack sensitivity of pipeline girth weld Download PDFInfo
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- CN104517002A CN104517002A CN201410442983.4A CN201410442983A CN104517002A CN 104517002 A CN104517002 A CN 104517002A CN 201410442983 A CN201410442983 A CN 201410442983A CN 104517002 A CN104517002 A CN 104517002A
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Abstract
The invention discloses a test method for cooling crack sensitivity of pipeline girth weld, comprising: establishing a plate finite element model for a Caspian Sea test; establishing a pipeline finite element model for a butt joint of a pipeline; setting first restraint intensity in a first functional relationship to be equal to second restraint intensity in a second functional relationship, and obtaining a corresponding third functional relationship of a slotting length X of a plate in the Caspian Sea test, the pipe diameter D of a steel pipe and a wall thickness t which have the same restraint intensity; according to the plate finite element model, conducting the process of finite element simulation for the Caspian Sea test. The test method can more accurately determine the preheating temperature in the welding parameter through test simulation, and carries out prediction to the cooling crack sensitivity of a pipeline girth welding joint through a prediction model.
Description
Technical field
The present invention relates to pipe welding seam technical field, particularly a kind of pipeline girth weld cold cracking sensitivity test method.
Background technology
In pipeline welding, cold crack is defect the most common.Avoid welding cold cracking the most simple effective method be exactly that Welded Pipe carries out preheating, preheat temperature is not more high better, and the key of problem is the determination of preheat temperature range and minimum preheat temperature.Preheat temperature is generally determined according to crazing-resistance test method.The cold crack test method that current engineering is commonly used comprises: implant test method and oblique Y groove docking cracking test method.But in actual engineering design with formulation welding technology, the preheat temperature determined from the angle of security insurance is usually higher, the too high meeting of preheat temperature causes the thermocatalysis excessively of weld seam, thus causes the generation of accident.Research is suitable for pipe ring welding cold crack test method, and the formulation for weld procedure specification is even more important, and does not also have the method accurately determining the preheat temperature in welding condition in prior art.
Summary of the invention
Technical matters to be solved by this invention is to provide a kind of pipeline girth weld cold cracking sensitivity test method determining the preheat temperature in welding condition by test simulation more accurately.
For solving the problems of the technologies described above, the invention provides a kind of pipeline girth weld cold cracking sensitivity test method, comprising:
Set up the sheet material finite element model of the Caspian Sea test; The first constraint (restraint) degree corresponding to different slotting length value X in the middle part of sheet material is calculated by described sheet material finite element model; Carry out matching by the value of described first constraint (restraint) degree corresponding to different described slotting length X and draw matched curve; The first funtcional relationship between described slotting length X and corresponding described first constraint (restraint) degree is drawn by described matched curve;
Set up the pipeline finite element model of pipeline open joint; By the value calculating the second constraint (restraint) degree of the steel pipe of different tube diameters D and different wall t of described pipeline finite element model; Carry out matching by the value of described second constraint (restraint) degree corresponding to the steel pipe of different described caliber D and different described wall thickness t and draw out fitting surface; The second funtcional relationship between described caliber D and wall thickness t and corresponding described second constraint (restraint) degree is drawn by described fitting surface;
The first constraint (restraint) degree in described first funtcional relationship is set the second constraint (restraint) degree equaled in described second funtcional relationship, draws the 3rd corresponding funtcional relationship of the described slotting length X of sheet material and the described caliber D of steel pipe and wall thickness t in the Caspian Sea test with identical constraint (restraint) degree;
Identical with the cracking breakout of the described steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of the sheet material in the test of described the Caspian Sea; Reflected by the Caspian Sea test that corresponding described slotting length is X by the cracking breakout of described 3rd funtcional relationship to be D and wall thickness by described caliber the be steel pipe of t;
The FEM numerical simulation process of the Caspian Sea test is carried out according to described sheet material finite element model; Described simulation process comprises: be the sheet material finite element model grid division of the sheet coupon of X to described slotting length, give material properties, determine boundary condition, load welding heat source weld and welded rear air cooling to room temperature; Described boundary condition comprises: preheat temperature; The finite element analogy tested by described the Caspian Sea can show that described slotting length is surface crack rate and the section crack rate of the sheet coupon of X;
Wherein, it be D and wall thickness is the steel pipe of t that the sheet coupon being X by described slotting length by described 3rd funtcional relationship is converted to corresponding described caliber; Described slotting length is that to be described caliber be D and wall thickness is surface crack rate and the section crack rate of the steel pipe of t for the surface crack rate of the sheet coupon of X and section crack rate; Can complete by setting different described slotting length X the prediction steel pipe of different described caliber D and wall thickness t being carried out to cracking breakout, the preheat temperature in welding condition can be predicted more accurately.
As preferably, both sides and the two ends of the described sheet coupon of described sheet material finite element model have the line of rabbet joint running through thickness of slab; The groove of described sheet coupon medial launder can change to the distance of described line of rabbet joint end;
The calculating of described sheet material finite element model comprises: carry out stress and strain model to described sheet material finite element model, determine boundary condition, imposed load and carry out FEM (finite element) calculation.
As preferably, the FEM numerical simulation process of described the Caspian Sea test also comprises: after described welding completes, on weld seam both sides, loading force makes it produce transversal displacement;
The application point of multiple described power is carried in weld seam both sides, and described application point is uniformly distributed on described weld seam both sides.
As preferably, described boundary condition also comprises: temperature, humidity, electric current, voltage, weld interval and speed of welding.
A kind of pipeline girth weld cold cracking sensitivity test method provided by the invention is by adopting finite element Modling model, the constraint (restraint) degree of the steel pipe seam of calculating different tube diameters, wall thickness, calculate the funtcional relationship between the caliber of the slotting length of sheet coupon and steel pipe in the test of the Caspian Sea, wall thickness, carry out curve fitting.Then the finite element simulation calculation by testing the Caspian Sea goes out the surface crack rate and section crack rate that slotting length is the sheet coupon of X, the rule identical with the cracking breakout of the steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of sheet material in the test of the Caspian Sea, and then the cracking breakout drawing the caliber corresponding with the sheet coupon of slotting length X to be D and wall thickness be the steel pipe of t; Can complete by setting different slotting length X the prediction steel pipe of different caliber D and wall thickness t being carried out to cracking breakout (i.e. girth joint cold cracking sensitivity), the finite element simulation calculation tested by the Caspian Sea like this can predict the preheat temperature in welding condition more accurately.
Accompanying drawing explanation
Fig. 1 is the structural representation of the sheet coupon shape and size of the Caspian Sea test that the embodiment of the present invention provides.
Fig. 2 is the matched curve figure of the different slotting length X that provides of the embodiment of the present invention and the first constraint (restraint) degree R1.
Fig. 3 is the fitting surface figure of the second constraint (restraint) degree R2 that steel pipe different tube diameters D, wall thickness t that the embodiment of the present invention provides are corresponding.
Embodiment
The invention provides a kind of pipeline girth weld cold cracking sensitivity test method, comprising:
See accompanying drawing 1, step S1: the sheet material finite element model setting up the Caspian Sea test; The first constraint (restraint) degree corresponding to different slotting length value X in the middle part of sheet material is calculated by sheet material finite element model; Carry out matching by the value of the first constraint (restraint) degree corresponding to different slotting length X and draw matched curve; See accompanying drawing 2, draw the first funtcional relationship between slotting length X and the first corresponding constraint (restraint) degree by matched curve.
Step S2: the pipeline finite element model setting up pipeline open joint; By the value calculating the second constraint (restraint) degree of the steel pipe of different tube diameters D and different wall t of pipeline finite element model; Carry out matching by the value of the second constraint (restraint) degree corresponding to the steel pipe of different caliber D and different wall thickness t and draw out fitting surface; See accompanying drawing 3, draw caliber D and the second funtcional relationship between wall thickness t and the second corresponding constraint (restraint) degree by fitting surface.
Step S3: the first constraint (restraint) degree in the first funtcional relationship is set the second constraint (restraint) degree equaled in the second funtcional relationship, draws the 3rd corresponding funtcional relationship of the slotting length X of sheet material and the caliber D of steel pipe and wall thickness t in the Caspian Sea test with identical constraint (restraint) degree.
Identical with the cracking breakout of the steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of the sheet material in the test of the Caspian Sea; Reflected by the Caspian Sea test that corresponding slotting length is X by the cracking breakout of the 3rd funtcional relationship to be D and wall thickness by caliber the be steel pipe of t; Cracking breakout comprises: surface crack rate and section crack rate.
Step S4: the FEM numerical simulation process of carrying out the Caspian Sea test according to sheet material finite element model; Simulation process comprises: cross-notching length be the sheet coupon of X sheet material finite element model grid division, give material properties, determine boundary condition, load welding heat source and carry out welding and welded rear air cooling to room temperature.Boundary condition comprises: preheat temperature; The finite element analogy tested by the Caspian Sea can show that slotting length is surface crack rate and the section crack rate of the sheet coupon of X.
Wherein, it be D and wall thickness is the steel pipe of t that the sheet coupon being X by slotting length by the 3rd funtcional relationship is converted to corresponding caliber; Slotting length is that to be caliber be D and wall thickness is surface crack rate and the section crack rate of the steel pipe of t for the surface crack rate of the sheet coupon of X and section crack rate; Can complete by setting different slotting length X the prediction steel pipe of different caliber D and wall thickness t being carried out to cracking breakout, the preheat temperature in welding condition can be predicted more accurately.
As preferably, in step S1, the both sides of the sheet coupon of sheet material finite element model and two ends have the line of rabbet joint running through thickness of slab; The constraint (restraint) degree of sheet coupon is made to reduce like this.The groove of sheet coupon medial launder can change to the distance of line of rabbet joint end, thus regulates constraint (restraint) degree size; When this distance equals certain value and just causes crackle, this value is just called critical constraint (restraint) degree, so the Caspian Sea test quantitative sign can cause the critical constraint (restraint) degree value of crackle.The calculating of sheet material finite element model comprises: carry out stress and strain model to sheet material finite element model, determine boundary condition, imposed load and carry out FEM (finite element) calculation.
As preferably, the FEM numerical simulation process of the Caspian Sea test in step S4 also comprises: after having welded, on weld seam both sides, loading force makes it produce transversal displacement; The application point of multiple power is carried in weld seam both sides, and application point is uniformly distributed on weld seam both sides.
Below by specific embodiment, the present invention is described in detail:
Step S1: the sheet material finite element model setting up the Caspian Sea test; Stress and strain model is carried out to sheet material finite element model, determines boundary condition, imposed load and carry out FEM (finite element) calculation, draw:
First of slotting length value X=25mm in the middle part of sheet material restrains angle value R1=2563MPa, and the displacement that simultaneously can obtain weld seam is 216.70 × 10
-3mm; Change slotting length value X successively and obtain the first corresponding contained angle value R1.
Namely slotting length value X=33mm obtain first restrain angle value R1=3832MPa, the displacement of weld seam is 144.97 × 10
-3mm.
The first contained angle value R1=6590MPa that slotting length value X=50mm obtains, the displacement of weld seam is 84.30 × 10
-3mm.
The first contained angle value R1=7183MPa that slotting length value X=55mm obtains, the displacement of weld seam is 77.34 × 10
-3mm.
The first contained angle value R1=8487MPa that slotting length value X=60mm obtains, the displacement of weld seam is 65.46 × 10
-3mm.
The first contained angle value R1=9571MPa that slotting length value X=64mm obtains, the displacement of weld seam is 58.04 × 10
-3mm.
The first contained angle value R1=13701MPa that slotting length value X=70mm obtains, the displacement of weld seam is 40.55 × 10
-3mm.
The first contained angle value R1=14430MPa that slotting length value X=73mm obtains, the displacement of weld seam is 38.50 × 10
-3mm.
The first contained angle value R1=16100MPa that slotting length value X=75mm obtains, the displacement of weld seam is 34.51 × 10
-3mm.
The first contained angle value R1=16966MPa that slotting length value X=84mm obtains, the displacement of weld seam is 32.75 × 10
-3mm.
The first contained angle value R1=17603MPa that slotting length value X=92mm obtains, the displacement of weld seam is 31.56 × 10
-3mm.
The first contained angle value R1=18269MPa that slotting length value X=100mm obtains, the displacement of weld seam is 30.41 × 10
-3mm.
Carry out matching by the value of the first constraint (restraint) degree R1 corresponding to slotting length X and draw matched curve; The first funtcional relationship between slotting length X and the first corresponding constraint (restraint) degree is drawn by matched curve:
Step S2: the pipeline finite element model setting up pipeline open joint; Stress and strain model is carried out to pipeline finite element model, determines boundary condition, imposed load and carry out FEM (finite element) calculation, draw:
Caliber is D=325mm and wall thickness is that angle value R2=9884MPa restrained by second of the steel pipe of t=15mm; Caliber is D=325mm and wall thickness is that angle value R2=10000MPa restrained by second of the steel pipe of t=17mm; Caliber is D=325mm and wall thickness is that angle value R2=12193MPa restrained by second of the steel pipe of t=20mm; Caliber is D=325mm and wall thickness is that angle value R2=13423MPa restrained by second of the steel pipe of t=22.5mm.
Caliber is D=406mm and wall thickness is that angle value R2=9823MPa restrained by second of the steel pipe of t=15mm; Caliber is D=406mm and wall thickness is that angle value R2=9835MPa restrained by second of the steel pipe of t=17mm; Caliber is D=406mm and wall thickness is that angle value R2=11739MPa restrained by second of the steel pipe of t=20mm; Caliber is D=406mm and wall thickness is that angle value R2=12559MPa restrained by second of the steel pipe of t=22.5mm.
Caliber is D=508mm and wall thickness is that angle value R2=9522MPa restrained by second of the steel pipe of t=15mm; Caliber is D=508mm and wall thickness is that angle value R2=9604MPa restrained by second of the steel pipe of t=17mm; Caliber is D=508mm and wall thickness is that angle value R2=10991MPa restrained by second of the steel pipe of t=20mm; Caliber is D=508mm and wall thickness is that angle value R2=11927MPa restrained by second of the steel pipe of t=22.5mm.
Caliber is D=813mm and wall thickness is that angle value R2=8256MPa restrained by second of the steel pipe of t=15mm; Caliber is D=813mm and wall thickness is that angle value R2=8733MPa restrained by second of the steel pipe of t=17mm; Caliber is D=813mm and wall thickness is that angle value R2=9051MPa restrained by second of the steel pipe of t=20mm; Caliber is D=813mm and wall thickness is that angle value R2=10703MPa restrained by second of the steel pipe of t=22.5mm.
Caliber is D=1016mm and wall thickness is that angle value R2=6711MPa restrained by second of the steel pipe of t=15mm; Caliber is D=1016mm and wall thickness is that angle value R2=7025MPa restrained by second of the steel pipe of t=17mm; Caliber is D=1016mm and wall thickness is that angle value R2=7679MPa restrained by second of the steel pipe of t=20mm; Caliber is D=1016mm and wall thickness is that angle value R2=8873MPa restrained by second of the steel pipe of t=22.5mm.
Carry out matching by the value of the second constraint (restraint) degree R2 corresponding to the steel pipe of different caliber D and different wall thickness t and draw out fitting surface; Caliber D and the second funtcional relationship between wall thickness t and the second corresponding constraint (restraint) degree R2 is drawn by fitting surface:
R2＝12840+4.51*D-662.2*t-0.003436*D
2-0.2788*D*t+32.01*t
2；
Step S3: the first constraint (restraint) degree in the first funtcional relationship is set the second constraint (restraint) degree equaled in the second funtcional relationship, and R1=R2 draws the 3rd corresponding funtcional relationship of the slotting length X of sheet material and the described caliber D of steel pipe and wall thickness t in the Caspian Sea test with identical constraint (restraint) degree:
Identical with the cracking breakout of the steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of the sheet material in the test of the Caspian Sea; Reflected by the Caspian Sea test that corresponding slotting length is X by the cracking breakout (i.e. girth joint cold cracking sensitivity) of the 3rd funtcional relationship to be D and wall thickness by caliber the be steel pipe of t; Cracking breakout comprises: surface crack rate and section crack rate;
Step S4: the FEM numerical simulation process of carrying out the Caspian Sea test according to sheet material finite element model; Simulation process comprises: cross-notching length be the sheet coupon of X sheet material finite element model grid division, give material properties, determine boundary condition, load welding heat source and carry out welding and welded rear air cooling to room temperature; The finite element analogy tested by the Caspian Sea can show that slotting length is surface crack rate and the section crack rate of the sheet coupon of X.
Below for caliber is 1219mm, wall thickness is the surface crack rate that draws of finite element analogy and the section crack rate statistical form in the Caspian Sea test (the slotting length X=80 of sheet coupon) corresponding to steel pipe of 22.0: (wherein table 1 is steel the Caspian Sea testing record sheet at-5 DEG C of temperature, and table 2 is steel the Caspian Sea testing record sheet at-30 DEG C of temperature)
Table 1
Table 2
It is D and wall thickness is the steel pipe of t that the sheet coupon being X by slotting length by the 3rd funtcional relationship is converted to corresponding caliber; Slotting length is that to be caliber be D and wall thickness is surface crack rate and the section crack rate of the steel pipe of t for the surface crack rate of the sheet coupon of X and section crack rate; Can complete by setting different slotting length X the prediction steel pipe of different caliber D and wall thickness t being carried out to cracking breakout (i.e. girth joint cold cracking sensitivity), the preheat temperature in welding condition can be predicted more accurately.
A kind of pipeline girth weld cold cracking sensitivity test method provided by the invention is by adopting finite element Modling model, the constraint (restraint) degree of the steel pipe seam of calculating different tube diameters, wall thickness, calculate the funtcional relationship between the caliber of the slotting length of sheet coupon and steel pipe in the test of the Caspian Sea, wall thickness, carry out curve fitting.Then the finite element simulation calculation by testing the Caspian Sea goes out the surface crack rate and section crack rate that slotting length is the sheet coupon of X, the rule identical with the cracking breakout of the steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of sheet material in the test of the Caspian Sea, and then the cracking breakout drawing the caliber corresponding with the sheet coupon of slotting length X to be D and wall thickness be the steel pipe of t; Can complete by setting different slotting length X the prediction steel pipe of different caliber D and wall thickness t being carried out to cracking breakout (i.e. girth joint cold cracking sensitivity), the finite element simulation calculation tested by the Caspian Sea like this can predict the preheat temperature in welding condition more accurately.
It should be noted last that, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to example to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from the spirit and scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (4)
1. a pipeline girth weld cold cracking sensitivity test method, is characterized in that, comprising:
Set up the sheet material finite element model of the Caspian Sea test; The first constraint (restraint) degree corresponding to different slotting length value X in the middle part of sheet material is calculated by described sheet material finite element model; Carry out matching by the value of described first constraint (restraint) degree corresponding to different described slotting length X and draw matched curve; The first funtcional relationship between described slotting length X and corresponding described first constraint (restraint) degree is drawn by described matched curve;
Set up the pipeline finite element model of pipeline open joint; By the value calculating the second constraint (restraint) degree of the steel pipe of different tube diameters D and different wall t of described pipeline finite element model; Carry out matching by the value of described second constraint (restraint) degree corresponding to the steel pipe of different described caliber D and different described wall thickness t and draw out fitting surface; The second funtcional relationship between described caliber D and wall thickness t and corresponding described second constraint (restraint) degree is drawn by described fitting surface;
The first constraint (restraint) degree in described first funtcional relationship is set the second constraint (restraint) degree equaled in described second funtcional relationship, draws the 3rd corresponding funtcional relationship of the described slotting length X of sheet material and the described caliber D of steel pipe and wall thickness t in the Caspian Sea test with identical constraint (restraint) degree;
Identical with the cracking breakout of the described steel pipe with identical constraint (restraint) degree under identical welding condition according to the cracking breakout of the sheet material in the test of described the Caspian Sea; Reflected by the Caspian Sea test that corresponding described slotting length is X by the cracking breakout of described 3rd funtcional relationship to be D and wall thickness by described caliber the be steel pipe of t; The FEM numerical simulation process of the Caspian Sea test is carried out according to described sheet material finite element model; Described simulation process comprises: be the sheet material finite element model grid division of the sheet coupon of X to described slotting length, give material properties, determine boundary condition, load welding heat source weld and welded rear air cooling to room temperature; Described boundary condition comprises: preheat temperature; The finite element analogy tested by described the Caspian Sea can show that described slotting length is surface crack rate and the section crack rate of the sheet coupon of X;
Wherein, it be D and wall thickness is the steel pipe of t that the sheet coupon being X by described slotting length by described 3rd funtcional relationship is converted to corresponding described caliber; Described slotting length is that to be described caliber be D and wall thickness is surface crack rate and the section crack rate of the steel pipe of t for the surface crack rate of the sheet coupon of X and section crack rate; Can complete by setting different described slotting length X the prediction steel pipe of different described caliber D and wall thickness t being carried out to cracking breakout, the preheat temperature in welding condition can be predicted more accurately.
2. test method according to claim 1, is characterized in that:
Both sides and the two ends of the described sheet coupon of described sheet material finite element model have the line of rabbet joint running through thickness of slab; The groove of described sheet coupon medial launder can change to the distance of described line of rabbet joint end;
The calculating of described sheet material finite element model comprises: carry out stress and strain model to described sheet material finite element model, determine boundary condition, imposed load and carry out FEM (finite element) calculation.
3. test method according to claim 1, is characterized in that:
The FEM numerical simulation process of described the Caspian Sea test also comprises: after described welding completes, on weld seam both sides, loading force makes it produce transversal displacement;
The application point of multiple described power is carried in weld seam both sides, and described application point is uniformly distributed on described weld seam both sides.
4. test method according to claim 1, is characterized in that:
Described boundary condition also comprises: temperature, humidity, electric current, voltage, weld interval and speed of welding.
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| CN114509318A (en) * | 2022-01-20 | 2022-05-17 | 天津大学 | Quantitative evaluation method for transverse cold crack sensitivity of typical joint welding of jacket |
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