CN101468427A - Laser welding method for joint of beginning and end of closed curve - Google Patents
Laser welding method for joint of beginning and end of closed curve Download PDFInfo
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- CN101468427A CN101468427A CN 200710308513 CN200710308513A CN101468427A CN 101468427 A CN101468427 A CN 101468427A CN 200710308513 CN200710308513 CN 200710308513 CN 200710308513 A CN200710308513 A CN 200710308513A CN 101468427 A CN101468427 A CN 101468427A
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Abstract
The invention discloses a method for welding the end-to-end joint of a closed curve by laser. In an ending stage for welding welding seams of the closed curve by laser, the rest parts of the welding seams of the closed curve are welded by suddenly improving a welding speed or lowering laser power at the same time of improving the welding speed; therefore, the method ensures that the end-to-end joints of the welding seams have no defect of concave pits, etc. at the end of welding the closed curve by laser, achieves a good forming effect at the end of welding, and also ensures smooth connection of the welded end-to-end joints of the closed welding seams. Moreover, the method can be realized by software control on a present laser automatic welding device, so that the method has the advantage of convenient and simple application.
Description
Technical field
The present invention relates to the laser welding technology field, more specifically, the present invention relates to a kind of laser weld joint of beginning and end of closed curve method.
Background technology
Use laser to come the welded closed curved welding seam, what technological parameter cooperated during usually owing to Laser Deep Penetration Welding keyhole effect and welding is unreasonable, generally can occur the defective of similar pit at the welding ending place of closed curve weld seam, as shown in Figure 1.At present, handle the method for this pit defect and mainly use the laser instrument that has T type power, but the additional function that T type power provides for laser manufacturers combines difficulty with laser instrument, involves great expense, make most laser instruments be difficult to configuration.That is to say that at present because the deficiency of closed curve laser processing technology, the defectives such as pit at the laser weld ending place of closed curve do not have good removing method.
Summary of the invention
For overcoming the defective that pit appears in laser weld ending place in the prior art, the present invention proposes a kind of laser weld joint of beginning and end of closed curve method.
According to an aspect of the present invention, provide a kind of laser weld joint of beginning and end of closed curve method, comprising: enter ending after the stage in laser weld, improve speed of welding, the remainder of welded closed curved welding seam.
Wherein, described closed curve weld seam comprises the weld seam of plane annular weld seam and space circular weld and other welding track closure.
Wherein, the moment of improving speed of welding can be to enter with the closed curve center of gravity to be the center of circle, to be the arbitrary moment after the scopes of positive and negative 30 degree from the head and the tail junction of closed curve weld seam angle.
Wherein, determine the numerical value that speed of welding improves according to the attribute and the weld penetration of welding material, usually, speed of welding improves more than 1 times.
According to a further aspect in the invention, provide a kind of laser weld joint of beginning and end of closed curve method, comprising: enter ending after the stage in laser weld, reduce laser power, the remainder of welded closed curved welding seam when improving speed of welding.
Wherein, described reduction laser power comprises that unexpected reduction laser power arrives a certain fixed value to a certain fixed value or linear reduction laser power.
Wherein, determine described fixed value according to the attribute of welding material and the weld penetration of described closed curve, generally, described fixed value is below 2/3 of former laser power.
By using the present invention, weld seam when guaranteeing the laser weld joint of beginning and end of closed curve does not produce defectives such as pit, reach good welding ending molding effect, guarantee the smooth connection of closed weld seam welding head and the tail junction, and this method can be used convenient and simple by the software control realization on present laser automatic welding device.
Description of drawings
Fig. 1 is the pit schematic diagram of closed curve welding head and the tail junction;
Fig. 2 is the closed weld seam schematic diagram of a kind of space annular;
Fig. 3 is the closed weld seam schematic diagram of a kind of plane annular;
Fig. 4 changes schematic diagram according to speed of welding in the embodiments of the invention 2 and laser power with soldering angle;
Fig. 5 changes schematic diagram according to speed of welding in the embodiments of the invention 3 and laser power with soldering angle;
Fig. 6 is to use joint of beginning and end of closed curve laser weld effect schematic diagram of the present invention.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, the method for a kind of laser weld joint of beginning and end of closed curve provided by the invention is described further.
Use laser weld closed curve weld seam, occur the defective of similar pit in welding head and the tail junction easily, described closed curve weld seam generally comprises the weld seam of plane annular weld seam and spatial loop weld seam and other welding track closure.
In an embodiment according to the present invention, during as shown in Figures 2 and 3 annular closed weld seam of laser weld, the part of need welding is fixed on the workbench, laser welding system places in the First Five-Year Plan axle interlock robot, and the five-axle linkage robot can carry out circular motion.During laser weld, the five-axle linkage robot makes circular motion to provide welding required speed.When laser weld closed curve weld seam, speed of welding is brought up to a stationary value, and laser head penetrates laser under this stable speed of welding, welds.When welding enter with the closed curve center of gravity be the center of circle, from weld seam curve head and the tail junction angle be positive and negative 30 degree scopes (in the present embodiment, this scope limits the ending stage) after, speed of welding brought up to a higher stable numerical value, finish the welding of residue section suddenly.The numerical value that speed improves is determined according to the attribute of welding material and the attribute of welding curve, rule of thumb be worth, if the thermal conductivity height of welding material, then speed can improve higher, weld penetration is darker, and then the speed raising is smaller, generally speaking, speed of welding need be enhanced about more than once, and the duration is for playing the welding end constantly from improving speed of welding.Improve the moment of speed of welding, can be in arbitrary moment in welding ending stage, preferably, not entering from weld seam curve head and the tail junction angle is moment within the positive and negative 2 degree scopes, but when the diameter of welding material is very big, then angular range can get that to enter from weld seam curve head and the tail junction angle be within the positive and negative 2 degree scopes.
In addition, also can work as laser weld and enter ending after the stage, when improving speed of welding, reducing laser power is a certain fixed value, rule of thumb be worth, described fixed value is relevant with the attribute and the weld penetration of welding material, the thermal conductivity height of welding material, under powered height is more, and weld penetration is big, it is few that power improves, generally speaking, need reduce to below 2/3 of former power, perhaps can be when improving speed of welding, linear reduction laser power, the slope of linear reduction power is by being starting point with former bonding power, the fixed value of setting is that the straightway of terminal point is determined.Adopt the method that reduces laser power when improving speed of welding, compare with the method that only improves speed of welding, the speed that is improved can be less relatively, and is easier in the realization, and welding effect is more good, and the welding curve is more level and smooth.
Embodiment 1
Laser weld circular weld as shown in Figure 3, shown in weld seam can get any diameter, in the present embodiment, the circular weld diameter is 50mm, parts fixation is on rotary table, laser welding system places on the weld seam to be welded.After laser weld begins, rotary table drives part to be welded and rotates, reach at the uniform velocity back (for example 5mm/s) laser welding system and penetrate laser, laser power P is 2000W, when welding enters the ending stage, in the present embodiment, the ending stage begins to locate to be set to be spun welded to the part of finishing 340 degree, at this moment, improves the speed V (for example 20mm/s) of rotary table suddenly, with this processing of speed of welding continuation faster, the residue welding section is finished in welding.
Embodiment 2
When embodiment 1 described circular weld was welded, after laser weld began, rotary table drove part to be welded and rotates, and reached at the uniform velocity back (for example 5mm/s) laser welding system and penetrated laser, and laser power P is 2000W.As shown in Figure 4, L is laser weld length (representing with angle for circular weld) among the figure, and P is a laser power, and V is a laser weld speed.When welding enters the ending stage, in the present embodiment, the ending stage begins to locate to be set to be spun welded to the part of finishing 330 degree, at this moment, improve turntable speed V (for example 20mm/s) suddenly, reducing laser power simultaneously is 800W, and with the power continuation processing of this speed of welding that improves and reduction, the residue welding section is finished in welding.
Embodiment 3
Laser weld circular weld as shown in Figure 3, welding enters ending after the stage as different from Example 2, improve turntable speed V suddenly, linear reduction laser power simultaneously, promptly last ending place laser power is not to be reduced to a fixed numbers at once, but linearly drops to a fixed value, as shown in Figure 5, L is laser weld length (representing with angle for circular weld) among the figure, and P is a laser power, and V is a laser weld speed.
Fig. 6 illustrates and uses ending of the present invention place welding effect schematic diagram, finds out that obviously the closed place of weld seam of closed curve ending does not produce defectives such as pit, reaches good welding ending molding effect, guarantees the smooth connection of closed weld seam welding head and the tail junction.
It should be noted that at last, above embodiment is only in order to illustrate that technical scheme of the present invention is not intended to limit, and on using, can extend to other modification, variation, application and embodiment, think that simultaneously all such modifications, variation, application, embodiment are within the spirit and scope of the present invention.
Claims (7)
1, a kind of method of laser weld joint of beginning and end of closed curve comprises: enter ending after the stage in laser weld, improve speed of welding, the remainder of welded closed curved welding seam.
The process of claim 1 wherein that 2, described closed curve weld seam comprises the weld seam of plane annular weld seam and space circular weld and other welding track closure.
The process of claim 1 wherein that 3, the moment of improving speed of welding can be to enter with the closed curve center of gravity to be the center of circle, to be the arbitrary moment after the scopes of positive and negative 30 degree from the head and the tail junction of closed curve weld seam angle.
The process of claim 1 wherein that 4, determine the numerical value that speed of welding improves according to the attribute and the weld penetration of welding material, usually, speed of welding improves more than 1 times.
5, the method for claim 1 further comprises: reduce laser power, the remainder of welded closed curved welding seam when improving speed of welding.
6, the method for claim 5, wherein, described reduction laser power comprises that unexpected reduction laser power arrives a certain fixed value to a certain fixed value or linear reduction laser power.
7, the method for claim 6 wherein, is determined described fixed value according to the attribute of welding material and the weld penetration of described closed curve, and generally, described fixed value is below 2/3 of former laser power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200710308513 CN101468427A (en) | 2007-12-29 | 2007-12-29 | Laser welding method for joint of beginning and end of closed curve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200710308513 CN101468427A (en) | 2007-12-29 | 2007-12-29 | Laser welding method for joint of beginning and end of closed curve |
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| CN101468427A true CN101468427A (en) | 2009-07-01 |
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| CN 200710308513 Pending CN101468427A (en) | 2007-12-29 | 2007-12-29 | Laser welding method for joint of beginning and end of closed curve |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000920A (en) * | 2011-01-06 | 2011-04-06 | 格特拉克（江西）传动系统有限公司 | Laser welding ending process |
| CN102220457A (en) * | 2011-05-25 | 2011-10-19 | 中国兵器工业集团第七○研究所 | Method for inhibiting laser melting and strengthening ending defects of valve seat ring |
| CN102658426A (en) * | 2012-05-11 | 2012-09-12 | 中国第一汽车股份有限公司 | Laser welding method of driver flexible disk assembly between engine and speed changing box |
| CN104607799A (en) * | 2015-01-30 | 2015-05-13 | 江苏中科四象激光科技有限公司 | Laser welding method for automobile skylight guide rail |
| CN104668776A (en) * | 2015-01-30 | 2015-06-03 | 江苏中科四象激光科技有限公司 | Laser welding method for closed type circumferential welds |
| CN106141450A (en) * | 2016-07-21 | 2016-11-23 | 成都福誉科技有限公司 | A kind of CO2cut Poewr control method and system |
| CN107243694A (en) * | 2017-07-19 | 2017-10-13 | 大族激光科技产业集团股份有限公司 | A kind of stitch welding of automobile galvanized sheet |
| CN107876979A (en) * | 2017-10-19 | 2018-04-06 | 江西恒动新能源有限公司 | A kind of power lithium-ion battery liquid injection port seals method for laser welding |
| CN110936013A (en) * | 2018-09-21 | 2020-03-31 | 大族激光科技产业集团股份有限公司 | Sealing method and sealing body of kovar alloy and dissimilar metal |
-
2007
- 2007-12-29 CN CN 200710308513 patent/CN101468427A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102000920A (en) * | 2011-01-06 | 2011-04-06 | 格特拉克（江西）传动系统有限公司 | Laser welding ending process |
| CN102220457A (en) * | 2011-05-25 | 2011-10-19 | 中国兵器工业集团第七○研究所 | Method for inhibiting laser melting and strengthening ending defects of valve seat ring |
| CN102658426A (en) * | 2012-05-11 | 2012-09-12 | 中国第一汽车股份有限公司 | Laser welding method of driver flexible disk assembly between engine and speed changing box |
| CN104607799A (en) * | 2015-01-30 | 2015-05-13 | 江苏中科四象激光科技有限公司 | Laser welding method for automobile skylight guide rail |
| CN104668776A (en) * | 2015-01-30 | 2015-06-03 | 江苏中科四象激光科技有限公司 | Laser welding method for closed type circumferential welds |
| CN106141450A (en) * | 2016-07-21 | 2016-11-23 | 成都福誉科技有限公司 | A kind of CO2cut Poewr control method and system |
| CN106141450B (en) * | 2016-07-21 | 2018-04-24 | 成都福誉科技有限公司 | A kind of CO2It is cut by laser Poewr control method and system |
| CN107243694A (en) * | 2017-07-19 | 2017-10-13 | 大族激光科技产业集团股份有限公司 | A kind of stitch welding of automobile galvanized sheet |
| CN107243694B (en) * | 2017-07-19 | 2019-08-30 | 大族激光科技产业集团股份有限公司 | A kind of stitch welding of automobile galvanized sheet |
| CN107876979A (en) * | 2017-10-19 | 2018-04-06 | 江西恒动新能源有限公司 | A kind of power lithium-ion battery liquid injection port seals method for laser welding |
| CN110936013A (en) * | 2018-09-21 | 2020-03-31 | 大族激光科技产业集团股份有限公司 | Sealing method and sealing body of kovar alloy and dissimilar metal |
| CN110936013B (en) * | 2018-09-21 | 2021-12-10 | 大族激光科技产业集团股份有限公司 | Sealing method and sealing body of kovar alloy and dissimilar metal |
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Open date: 20090701 |