CN101905380A - Method for determining full penetration laser welding process parameter of sheet - Google Patents
Method for determining full penetration laser welding process parameter of sheet Download PDFInfo
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- CN101905380A CN101905380A CN 201010252689 CN201010252689A CN101905380A CN 101905380 A CN101905380 A CN 101905380A CN 201010252689 CN201010252689 CN 201010252689 CN 201010252689 A CN201010252689 A CN 201010252689A CN 101905380 A CN101905380 A CN 101905380A
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Abstract
The invention belongs to laser welding technology, and relates to a method for determining a process parameter during full penetration laser welding of a metal sheet with the thickness of less than 3 millimeters. The method for determining the process parameter is characterized by comprising the following steps of: defining; establishing a full penetration laser welding process parameter window of the sheet; and determining the full penetration laser welding process parameter of the sheet. The method can ensure weld quality, does not need metallographic phase sampling analysis, and has short work period and low welding cost.
Description
Technical field
The invention belongs to laser welding technology, relate to a kind of definite method of carrying out full penetration laser welding technological parameter when connecing at thickness less than the sheet metal of 3mm.
Background technology
The technological parameter that influences sheet metal full penetration laser welding quality mainly contains laser power, speed of welding and defocusing amount (focus is apart from the distance of material surface).Laser power, speed of welding and out of focus method for determination of amount are at present: by the simple corresponding relation between welding procedure test acquisition laser power, speed of welding and defocusing amount and weld penetration or the weld width, when choosing the laser weld parameter, many is that the employing defocusing amount is 0, under the different laser power conditions of being set up, utilize laser power, the speed of welding of determining the welding of thin plate penetration in the relation curve of speed of welding and weld penetration, the method that this technological parameter is selected is similar to conventional arc welding.And sheet metal full penetration laser welding termination process mechanism is different from arc welding, and the appearance of weld feature of formation also is different from the arc welding weld seam.When sheet metal adopts the high power laser welding, be the penetration fustion welding pattern, in actual applications, constant even welding condition is stablized, the phenomenon of process unstability, appearance of weld shakiness also appears in full penetration laser welding, so the existing processes parameter determination method is difficult for guaranteeing weldquality.And, need do the metallographic sample analysis to the sample weld seam, cause the cycle long, the cost height.
Summary of the invention
The objective of the invention is: the method for definite full penetration laser welding process parameter of sheet of propose a kind ofly to guarantee weldquality, do not need to do the metallographic sample analysis, the cycle is short, cost is low.
Technical scheme of the present invention is: a kind of method of definite full penetration laser welding process parameter of sheet, and use laser welder to carry out plate sheet welding, it is characterized in that, determine that the step of technological parameter is as follows:
1, definition; Definition weld seam across back ratio: the frontal width of thin board welding seam is defined as TW, and back side width is defined as RW, and then the weld seam across back is than η=RW/TW; The definition thin plate: thin plate is the metallic plate that is not more than 3mm;
2, set up the full penetration laser welding process parameter of sheet window;
2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
2.2, carry out laser welding process test;
Adopt high-power CO
2Laser welder or YAG laser welder weld, and carry out the welding of laser full penetration for the thin plate sample of material to be welded;
2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding, be not less than 1000 watts for titanium alloy and steel, be not less than 1500 watts for aluminium alloy, the laser power parameter when in the scope of minimum laser power value and the specified output laser power value of laser welder, equidistantly choosing at least 5 laser power values as welded specimen;
2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination, total
The bond pads parameter combinations, m is the number of laser power parameter, n is the number of speed of welding value;
2.2.4, welding thin plate sample; According to the welding parameter combination that step 2.2.3 determines, weld the thin plate sample respectively;
2.3, estimate the sample weldquality;
2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
2.4, carry out the weld seam across back than calculating;
2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
2.5, draw laser weld parameter coordinate diagram;
2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Advantage of the present invention is: can guarantee weldquality, not need to do the metallographic sample analysis, the work period is short, and welding cost is low.Evidence, the work period of the present invention has shortened more than 80% than existing method.
Description of drawings
Fig. 1 is the laser weld parameter coordinate diagram of embodiment 1.
Fig. 2 is the laser weld parameter coordinate diagram of embodiment 2.
Fig. 3 is the laser weld parameter coordinate diagram of embodiment 3.
The specific embodiment
Below the present invention is described in further details.A kind of method of definite full penetration laser welding process parameter of sheet uses laser welder to carry out plate sheet welding, it is characterized in that, determines that the step of technological parameter is as follows:
1, definition; Definition weld seam across back ratio: the frontal width of thin board welding seam is defined as TW, and back side width is defined as RW, and then the weld seam across back is than η=RW/TW; The definition thin plate: thin plate is the metallic plate that is not more than 3mm;
2, set up the full penetration laser welding process parameter of sheet window;
2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
2.2, carry out laser welding process test;
Adopt high-power CO
2Laser welder or YAG laser welder weld, and carry out the welding of laser full penetration for the thin plate sample of material to be welded;
2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding, be not less than 1000 watts for titanium alloy and steel, be not less than 1500 watts for aluminium alloy, the laser power parameter when in the scope of minimum laser power value and the specified output laser power value of laser welder, equidistantly choosing at least 5 laser power values as welded specimen;
2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination, total
The bond pads parameter combinations, m is the number of laser power parameter, n is the number of speed of welding value;
2.2.4, welding thin plate sample; According to the welding parameter combination that step 2.2.3 determines, weld the thin plate sample respectively;
2.3, estimate the sample weldquality;
2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
2.4, carry out the weld seam across back than calculating;
2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
2.5, draw laser weld parameter coordinate diagram;
2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Operation principle of the present invention is: utilize sheet laser penetration fustion welding appearance of weld geometric properties can reflect the characteristics of weldquality, definition weld seam across back is than being the characteristic quantity of thin plate full penetration weld geometric properties, set up sheet laser penetration fustion welding full penetration welding condition coordinate diagram by process parameter test then, butt welding taps into capable weld porosity defect analysis, define the weld seam across back that obtains to satisfy the weldquality requirement and compare critical value, again full penetration welding condition coordinate diagram is analyzed, finally set up the full penetration sheet laser welding condition interval that weld porosity satisfies quality requirement, can be used as the reference basis that the sheet laser welding condition is selected.
Embodiment 1: titanium-alloy thin-plate CO
2Laser weld
1, embodiment condition: the titanium-alloy thin-plate of thickness of slab 2.5mm;
2, the foundation of full penetration laser welding process parameter of sheet window;
2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
2.2, carry out laser welding process test;
Adopt high-power CO
2Laser welder carries out the welding of laser full penetration;
2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding is got 1000 watts (kW) for titanium alloy, the laser power parameter when equidistantly choosing 5 laser power values as welded specimen in the scope of minimum laser power value and the specified output laser power value of laser welder;
2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination;
2.2.4, welding thin plate sample; According to the welding parameter combination that step 2.2.3 determines, weld the thin plate sample respectively;
2.3, estimate the sample weldquality;
2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
2.4, carry out the weld seam across back than calculating;
2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
2.5, draw laser weld parameter coordinate diagram;
2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Embodiment 2: titanium-alloy thin-plate YAG laser weld
1, embodiment condition: the titanium-alloy thin-plate of thickness of slab 2.5mm;
2, the foundation of full penetration laser welding process parameter of sheet window;
2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
2.2, carry out laser welding process test;
Adopt high-power YAG laser welder to carry out the welding of laser full penetration;
2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding is got 1000 watts (kW) for titanium alloy, the laser power parameter when equidistantly choosing 5 laser power values as welded specimen in the scope of minimum laser power value and the specified output laser power value of laser welder;
2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination;
2.2.4, welding thin plate sample; According to the welding parameter combination that step 2.2.3 determines, weld the thin plate sample respectively;
2.3, estimate the sample weldquality;
2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
2.4, carry out the weld seam across back than calculating;
2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
2.5, draw laser weld parameter coordinate diagram;
2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Embodiment 3: aluminium lithium alloy thin plate YAG laser weld
1, embodiment condition: the aluminium lithium alloy thin plate of thickness of slab 3mm;
2, the foundation of full penetration laser welding process parameter of sheet window;
2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
2.2, carry out laser welding process test;
Adopt high-power YAG laser welder to carry out the welding of laser full penetration;
2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding is got 1600 watts (kW) for aluminium lithium alloy, the laser power parameter when equidistantly choosing 5 laser power values as welded specimen in the scope of minimum laser power value and the specified output laser power value of laser welder;
2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination;
2.2.4, welding thin plate sample; According to the welding parameter combination that step 2.2.3 determines, weld the thin plate sample respectively;
2.3, estimate the sample weldquality;
2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
2.4, carry out the weld seam across back than calculating;
2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
2.5, draw laser weld parameter coordinate diagram;
2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Claims (1)
1. the method for a definite full penetration laser welding process parameter of sheet uses laser welder to carry out plate sheet welding, it is characterized in that, determines that the step of technological parameter is as follows:
1.1, the definition; Definition weld seam across back ratio: the frontal width of thin board welding seam is defined as TW, and back side width is defined as RW, and then the weld seam across back is than η=RW/TW; The definition thin plate: thin plate is the metallic plate that is not more than 3mm;
1.2, set up the full penetration laser welding process parameter of sheet window;
1.2.1, set up the laser welding process parameter coordinate system; Ordinate is a laser power, and abscissa is a speed of welding;
1.2.2, carry out laser welding process test;
Adopt high-power CO
2Laser welder or YAG laser welder weld, and carry out the welding of laser full penetration for the thin plate sample of material to be welded;
1.2.2.1, determine the laser defocusing amount; The laser defocusing amount is in-1mm～1mm scope, when the laser beam focus be positioned at metallic plate to be welded when positive defocusing amount be 0, when the laser beam focus be positioned at metallic plate to be welded front when following defocusing amount for negative, otherwise for just;
1.2.2.2, the laser power p when determining welded specimen; Needed minimum laser power during welding, be not less than 1000 watts for titanium alloy and steel, be not less than 1500 watts for aluminium alloy, the laser power parameter when in the scope of minimum laser power value and the specified output laser power value of laser welder, equidistantly choosing at least 5 laser power values as welded specimen;
1.2.2.2, the speed of welding v when determining welded specimen; Speed of welding is not less than 0.5m/min, on the basis of minimum speed of welding, is step-length with 0.5m/min, determines 4 speed of welding values that increase progressively at least again;
1.2.2.3, the welding parameter when determining welded specimen combination; With a laser power parameter and a speed of welding value combination, obtain a welding parameter combination, total
The bond pads parameter combinations, m is the number of laser power parameter, n is the number of speed of welding value;
1.2.2.4, welding thin plate sample; According to the welding parameter combination that step 1.2.2.3 determines, weld the thin plate sample respectively;
1.2.3, estimate the sample weldquality;
1.2.3.1, carry out visualize; All sample weld seams are carried out visualize, face of weld undercut and the surperficial sample weld seam that stays have been judged to be the blemish weld seam, the pairing welding parameter combination of this sample has been judged to be the blemish welding parameter, be labeled as the category-B parameter combinations;
1.2.3.2, carry out the X-ray flaw detection; All sample weld seams are carried out the X-ray flaw detection, will have weld porosity to be judged to be defective weld seam, the pairing welding parameter combination of this sample is judged to be defective welding parameter, be labeled as C class parameter combinations;
1.2.3.3, remaining sample weld seam is judged to be qualified weld seam, the combination of the pairing welding parameter of this sample is judged to be qualified welding parameter, be labeled as the category-A parameter combinations;
1.2.4, carry out the weld seam across back than calculating;
1.2.4.1, measure the frontal width and the back side width of weld seam; Utilize tool microscope to measure the frontal width and the back side width of all sample weld seams, the method of measuring is: to each sample weld seam along 5 measuring positions of fusion length direction picked at random, measure the frontal width and the back side width of place, 5 measuring positions weld seam respectively, average then as the frontal width and the back side width of this sample weld seam, by measure every bond pads parameter combinations the frontal width and the back side width of corresponding weld seam;
1.2.4.2, according to the definition of weld seam across back ratio calculate every bond pads parameter combinations the across back ratio η of corresponding weld seam
t, t=1,2 ... k;
1.2.5, draw laser weld parameter coordinate diagram;
1.2.5.1, with the classification and the across back ratio η of A, B, C three class welding parameters combination
tMark forms laser weld parameter coordinate diagram in laser welding process parameter coordinate system;
1.2.5.2, determine the last critical curve L1 and the lower critical curve L2 of laser weld parameter;
1.2.5.2.1, determine the last critical curve L1 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain critical curve L1 category-B welding parameter combination coordinate points;
1.2.5.2.2, determine the lower critical curve L2 of laser weld parameter; Utilize the nonlinear function regression fit in the numerical analysis method to obtain lower critical curve L2 than in the coordinate points of 0.4～0.5 scope weld seam across back in A and the C class welding parameter combination coordinate points;
1.3, determine full penetration laser welding process parameter of sheet; Welding parameter between last critical curve L1 and the lower critical curve L2 is combined as the technological parameter selected of thin plate full penetration weld.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010252689 CN101905380A (en) | 2010-08-13 | 2010-08-13 | Method for determining full penetration laser welding process parameter of sheet |
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| CN103433634A (en) * | 2013-08-15 | 2013-12-11 | 北京隆盛泰科石油管科技有限公司 | Testing method for verifying reliability of tee joint welding process |
| CN104679995A (en) * | 2015-02-04 | 2015-06-03 | 大连理工大学 | Mechanical property prediction method for laser heterogeneous weld joint |
| CN109664021A (en) * | 2018-12-17 | 2019-04-23 | 中国航发动力股份有限公司 | A kind of method for laser welding in thin-wall curve narrow face |
| CN110722285A (en) * | 2019-09-30 | 2020-01-24 | 湖南科技大学 | Laser hot wire welding seam forming quality prediction method, system and medium |
| CN112985236A (en) * | 2019-12-17 | 2021-06-18 | 中核建中核燃料元件有限公司 | Method for rapidly and visually inspecting weld penetration without measuring tool |
| CN112986525A (en) * | 2019-12-17 | 2021-06-18 | 中核建中核燃料元件有限公司 | Visual inspection method for weld penetration |
| CN114309939A (en) * | 2022-01-07 | 2022-04-12 | 武汉锐科光纤激光技术股份有限公司 | Copper-based sheet material belt laser welding method and laser welding equipment |
| CN114505584A (en) * | 2022-03-17 | 2022-05-17 | 中国工程物理研究院核物理与化学研究所 | Welding method for miniature fission chamber air extraction adapter and air extraction pipe |
| CN114309939B (en) * | 2022-01-07 | 2024-05-03 | 武汉锐科光纤激光技术股份有限公司 | Laser welding method and laser welding equipment for copper-based sheet material belt |
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| CN104679995B (en) * | 2015-02-04 | 2017-08-01 | 大连理工大学 | A kind of laser Dissimilar metal joints mechanical property prediction method |
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| CN110722285A (en) * | 2019-09-30 | 2020-01-24 | 湖南科技大学 | Laser hot wire welding seam forming quality prediction method, system and medium |
| CN112985236A (en) * | 2019-12-17 | 2021-06-18 | 中核建中核燃料元件有限公司 | Method for rapidly and visually inspecting weld penetration without measuring tool |
| CN112986525A (en) * | 2019-12-17 | 2021-06-18 | 中核建中核燃料元件有限公司 | Visual inspection method for weld penetration |
| CN114309939A (en) * | 2022-01-07 | 2022-04-12 | 武汉锐科光纤激光技术股份有限公司 | Copper-based sheet material belt laser welding method and laser welding equipment |
| CN114309939B (en) * | 2022-01-07 | 2024-05-03 | 武汉锐科光纤激光技术股份有限公司 | Laser welding method and laser welding equipment for copper-based sheet material belt |
| CN114505584A (en) * | 2022-03-17 | 2022-05-17 | 中国工程物理研究院核物理与化学研究所 | Welding method for miniature fission chamber air extraction adapter and air extraction pipe |
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