CN103464895A - Shielding gas for laser welding and welding method - Google Patents
Shielding gas for laser welding and welding method Download PDFInfo
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- CN103464895A CN103464895A CN2013103841536A CN201310384153A CN103464895A CN 103464895 A CN103464895 A CN 103464895A CN 2013103841536 A CN2013103841536 A CN 2013103841536A CN 201310384153 A CN201310384153 A CN 201310384153A CN 103464895 A CN103464895 A CN 103464895A
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Abstract
The invention discloses a shielding gas for laser welding. The shielding gas includes 92% to 96% of inert gas and 4% to 8% of CO2 by volume; the inert gas comprises 60% to 70% of He and 30% to 40% of Ar by volume. The invention further provides a welding method. The shielding gas is side-blowing sprayed during welding to remove light-induced plasmas above a welding region effectively. The shielding gas is capable of removing the light-induced plasmas above the welding region effectively, beam absorption and scattering losses can be reduced, and coupling between laser energy and the welded workpiece can be improved; ingredient cost of the shielding gas is lower, production cost is reduced, and the shielding gas is adaptable to large-scale industrial production.
Description
Technical field
The present invention relates to relate to the welding processing technical field, relate in particular to a kind of protective gas and welding method of laser weld.
Background technology
Laser weld is to take high power focused laser beam as thermal source, and laser beam is shone directly into to material surface, by Reciprocity of Laser & Materials, makes the material melting and connects, and forms the technical process of good welding point.Laser weld can be divided into pulsed laser welding and continuous laser welding, by its Thermodynamic Mechanism, can be divided into again laser heat conduction weld and Laser Deep Penetration Welding (or claiming the laser deep penetration welding).The application of laser weld starts from 1964, but only limits in early days carry out with the small-power pulsed solid stale laser welding of thin finding.Since the seventies, along with the high-power CO of multikilowatt
2the appearance of laser instrument, Laser Deep Penetration Welding has obtained development rapidly.The thickness of laser weld is brought up to 50mm from a few tenths of a mm, has been applied to the essential industry departments such as automobile, iron and steel, aviation, atomic energy, electric and electronic.In the application of countries in the world Laser Processing, the application of laser weld is only second to laser cutting, accounts for 20.9% at present.
In the process of laser weld, the heat that the welding work pieces Surface absorption is a large amount of and melting rapidly and further vaporization forms the steam cloud cluster above welding work pieces, and the steam cloud cluster, on the incident path of laser beam, absorbs heat ionization, produces plasma.Can absorb and reflect by contrary bremstrahlen after photo plasma forms laser beam is produced to screen effect, affect the coupling of light energy and welding work pieces, cause a large amount of light energy losses, thereby affect the size of welding penetration, the generation of pore and the morphological element of weld seam etc.
Adopt at present usually the mode of injecting protective gas to blow down photo plasma, injecting protective gas mainly contains side blown type and coaxial-type, and side blown type is simple in structure and be easy to realize being widely used due to it.Described protective gas can be He, Ar, N
2or CO
2, different protective gas has different impacts to the fusion penetration of laser weld, wherein; adopt pure helium can obtain larger fusion penetration as protective gas, but its molecular wt is less, therefore; helium-atmosphere gas needs larger flow velocity, effectively the metallic vapour on laser beam path is discharged guaranteeing; And, because the unit cost of helium is higher, the pure helium of a large amount of employings has increased production cost as protective gas.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiency in prior art; a kind of protective gas and welding method of laser weld are provided; this protective gas can effectively be driven away the photo plasma of welding region top; reduce beam absorption and scattering loss, improve the coupling of laser energy and welding work pieces; And the constituent cost of this protective gas is low, has reduced production cost, is suitable for large-scale industrial production.
The technical solution adopted for the present invention to solve the technical problems is: a kind of protective gas of laser weld, wherein, with volume ratio, calculate, and described protective gas comprises 92%～96% inert gas and 4%～8% CO
2; Wherein, described inert gas comprises He and Ar, with volume ratio, calculates, and the ratio of He and Ar is 60%～70%:30%～40%.
Preferably, with volume ratio, calculate, described protective gas comprises 94%～96% inert gas and 6%～8% CO
2.
Preferably, with volume ratio, calculate, the ratio of He and Ar is 65%～68%:32%～35%.
Preferably, calculate by volume, described protective gas comprises 95% inert gas and 5% CO
2; Wherein, described inert gas comprises He and Ar, calculates by volume, and the ratio of He and Ar is 65%:35%.
Another aspect of the present invention is to provide a kind of method of laser weld, wherein, the photo plasma in welding process above employing side blown type injecting protective gas expeling welding region, wherein, described protective gas is protective gas as above.
Preferably, the horizontal plane of welding region of take is benchmark, and the spray angle of described side blown type injecting protective gas is for being 30～50 °.
Preferably, described side blown type injecting protective gas flow velocity be 10～20L/min.
Preferably, the light source of described laser weld is CO
2gas laser or YAG solid state laser.
The invention has the beneficial effects as follows, laser welding protective body provided by the invention is inert gas and CO
2mist; the mist that wherein said inert gas is He and Ar; and He has larger ratio in mist; this protective gas can effectively be driven away the photo plasma of welding region top; reduce beam absorption and scattering loss, improve the coupling of laser energy and welding work pieces; And the constituent cost of this protective gas is low, has reduced production cost, is suitable for large-scale industrial production.
The specific embodiment
The present invention is further detailed explanation in conjunction with specific embodiments now.
The protective gas of a kind of laser weld that the present embodiment provides is inert gas and CO
2mist, calculate by volume, described protective gas comprises 95% inert gas and 5% CO
2; Wherein, the mist that wherein said inert gas is He and Ar, calculate by volume, and the ratio of He and Ar is 65%:35%.
In some other embodiment, with volume ratio, calculate, described protective gas can be chosen as 92%～96% inert gas and 4%～8% CO
2; Wherein, described inert gas comprises He and Ar, with volume ratio, calculates, and the ratio of He and Ar can be chosen as 60%～70%:30%～40%; Further, with volume ratio, calculate, described protective gas can be chosen as 94%～96% inert gas and 6%～8% CO
2, in described inert gas, with volume ratio, to calculate, the ratio of He and Ar is 65%～68%:32%～35%.
The present embodiment also provides a kind of method of laser weld, wherein, the photo plasma in welding process above employing side blown type injecting protective gas expeling welding region, wherein, described protective gas is protective gas as above.
Wherein, the horizontal plane of welding region of take is benchmark, and the spray angle of described side blown type injecting protective gas can be chosen as 30～50 °; In the present embodiment, this angle Selection is 30 °.
Wherein, described side blown type injecting protective gas flow velocity can be chosen as 10～20L/min; In the present embodiment, this flow velocity is chosen as 20L/min.
Wherein, the light source of described laser weld is CO
2gas laser or YAG solid state laser.
In sum, laser welding protective body provided by the invention is inert gas and CO
2mist; the mist that wherein said inert gas is He and Ar; and He has larger ratio in mist; this protective gas can effectively be driven away the photo plasma of welding region top; reduce beam absorption and scattering loss, improve the coupling of laser energy and welding work pieces; And the composition cost of protective gas is low, has reduced production cost, is suitable for large-scale industrial production.
The above-mentioned foundation desirable embodiment of the present invention of take is enlightenment, and by above-mentioned description, the relevant staff can, in the scope that does not depart from this invention technological thought, carry out various change and modification fully.The technical scope of this invention is not limited to the content on specification, must determine its technical scope according to the claim scope.
Claims (8)
1. the protective gas of a laser weld, is characterized in that, with volume ratio, calculates, and described protective gas comprises 92%～96% inert gas and 4%～8% CO
2; Wherein, described inert gas comprises He and Ar, with volume ratio, calculates, and the ratio of He and Ar is 60%～70%:30%～40%.
2. protective gas according to claim 1, is characterized in that, with volume ratio, calculates, and described protective gas comprises 94%～96% inert gas and 6%～8% CO
2.
3. protective gas according to claim 1, is characterized in that, in described inert gas, with volume ratio, calculates, and the ratio of He and Ar is 65%～68%:32%～35%.
4. protective gas according to claim 1, is characterized in that, calculates by volume, and described protective gas comprises 95% inert gas and 5% CO
2; Wherein, described inert gas comprises He and Ar, calculates by volume, and the ratio of He and Ar is 65%:35%.
5. the method for a laser weld, is characterized in that, the photo plasma in welding process above employing side blown type injecting protective gas expeling welding region, and wherein, described protective gas is the arbitrary described protective gas of claim 1-4.
6. the method for laser weld according to claim 5, is characterized in that, the horizontal plane of welding region of take is benchmark, and the spray angle of described side blown type injecting protective gas is for being 30～50 °.
7. the method for laser weld according to claim 5, is characterized in that, described side blown type injecting protective gas flow velocity be 10～20L/min.
8. the method for laser weld according to claim 5, is characterized in that, the light source of described laser weld is CO
2gas laser or YAG solid state laser.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103841536A CN103464895A (en) | 2013-08-29 | 2013-08-29 | Shielding gas for laser welding and welding method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103841536A CN103464895A (en) | 2013-08-29 | 2013-08-29 | Shielding gas for laser welding and welding method |
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| CN103464895A true CN103464895A (en) | 2013-12-25 |
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Citations (8)
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| CN1972040A (en) * | 2005-11-25 | 2007-05-30 | 乔治洛德方法研究和开发液化空气有限公司 | Method of cutting stainless steel by using fiber laser |
| CN101015889A (en) * | 2006-02-07 | 2007-08-15 | 乔治洛德方法研究和开发液化空气有限公司 | Laser beam cutting method of a workpiece of titanium with the help of a gas mixture of ar/he |
| US20070235429A1 (en) * | 2006-03-15 | 2007-10-11 | Air Liquide Industrial Us Lp | Braze-welding of steel workpieces with copper wire and oxidizing gas mixture |
| CN101502918A (en) * | 2009-01-16 | 2009-08-12 | 北京工业大学 | Method for reducing laser welding pores of cast magnesium alloy |
| CN102211243A (en) * | 2010-04-09 | 2011-10-12 | 株式会社东芝 | Shielding gas for MAG welding, MAG welding method, and welded structure |
| CN102225494A (en) * | 2011-06-07 | 2011-10-26 | 上海交通大学 | Laser-arc hybrid welding double-wide narrow-groove welding method |
| CN103056524A (en) * | 2012-12-24 | 2013-04-24 | 长春轨道客车股份有限公司 | Laser overlapping half penetration welding method with non-oxidation non-penetration face |
| CN103071951A (en) * | 2012-12-21 | 2013-05-01 | 武汉市润之达石化设备有限公司 | Ultra-low-temperature stainless steel welding protection gas |
-
2013
- 2013-08-29 CN CN2013103841536A patent/CN103464895A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1972040A (en) * | 2005-11-25 | 2007-05-30 | 乔治洛德方法研究和开发液化空气有限公司 | Method of cutting stainless steel by using fiber laser |
| CN101015889A (en) * | 2006-02-07 | 2007-08-15 | 乔治洛德方法研究和开发液化空气有限公司 | Laser beam cutting method of a workpiece of titanium with the help of a gas mixture of ar/he |
| US20070235429A1 (en) * | 2006-03-15 | 2007-10-11 | Air Liquide Industrial Us Lp | Braze-welding of steel workpieces with copper wire and oxidizing gas mixture |
| CN101502918A (en) * | 2009-01-16 | 2009-08-12 | 北京工业大学 | Method for reducing laser welding pores of cast magnesium alloy |
| CN102211243A (en) * | 2010-04-09 | 2011-10-12 | 株式会社东芝 | Shielding gas for MAG welding, MAG welding method, and welded structure |
| CN102225494A (en) * | 2011-06-07 | 2011-10-26 | 上海交通大学 | Laser-arc hybrid welding double-wide narrow-groove welding method |
| CN103071951A (en) * | 2012-12-21 | 2013-05-01 | 武汉市润之达石化设备有限公司 | Ultra-low-temperature stainless steel welding protection gas |
| CN103056524A (en) * | 2012-12-24 | 2013-04-24 | 长春轨道客车股份有限公司 | Laser overlapping half penetration welding method with non-oxidation non-penetration face |
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Application publication date: 20131225 |