CN102240851A - Welding forming method of thin invar alloy - Google Patents
Welding forming method of thin invar alloy Download PDFInfo
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- CN102240851A CN102240851A CN2011101844348A CN201110184434A CN102240851A CN 102240851 A CN102240851 A CN 102240851A CN 2011101844348 A CN2011101844348 A CN 2011101844348A CN 201110184434 A CN201110184434 A CN 201110184434A CN 102240851 A CN102240851 A CN 102240851A
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Abstract
本发明公开了一种薄因瓦合金的焊接成形方法，利用Nd:YAG激光器进行焊接。把因瓦合金固定于夹具后安装至工作台，调整Nd:YAG激光器的脉冲宽度、脉冲频率、激光与薄因瓦合金的相对位置以及侧吹保护气体压力，确定合适的激光平均线能量密度，对薄因瓦合金进行成形焊接。本发明利用激光直接实现了因瓦合金的焊接，因此焊接时不需要额外填加焊丝。由于本发明所使用的激光器激光脉冲宽度、频率以及离焦量连续可调，可实现0.5～2mm厚度因瓦合金的自熔焊接成形。由于本发明的Nd:YAG激光器的脉冲激光线能量密度在100～900J/mm之间，可实现焊缝处无明显正负余高和无气孔裂纹缺陷，无需对焊缝进行后续加工。
The invention discloses a welding and forming method of a thin Invar alloy, which utilizes a Nd:YAG laser for welding. Fix the Invar alloy on the fixture and install it on the workbench, adjust the pulse width and pulse frequency of the Nd:YAG laser, the relative position of the laser and the thin Invar alloy, and the pressure of the side blowing protective gas to determine the appropriate average laser energy density. Form welding of thin Invar alloys. The invention uses laser to directly realize the welding of Invar alloy, so no additional welding wire needs to be added during welding. Since the laser pulse width, frequency and defocus amount of the laser used in the present invention are continuously adjustable, the self-melting welding forming of the Invar alloy with a thickness of 0.5-2 mm can be realized. Since the pulsed laser line energy density of the Nd:YAG laser of the present invention is between 100 and 900 J/mm, no obvious positive and negative reinforcement and no pore crack defect can be realized at the weld seam, and no subsequent processing of the weld seam is required.
Description
Technical field
The present invention relates to the welding forming method of a kind of solder technology, particularly a kind of thin invar alloy.
Background technology
Continuous development along with science and technology, invar alloy (Invar36) is because its lower thermal coefficient of expansion characteristic, obtained using widely in Aero-Space, petrochemical industry transportation, IC equipment manufacturing industry, as be used for mobile satellite location equipment pedestal, liquefied natural gas constant temperature transfer cask, aircraft composite material mould, electronic applications microwave cavity and litho machine specific function parts etc.And above-mentioned application relates to the welding processing to invar alloy without exception, so the solder technology of invar alloy has directly influenced the accuracy of manufacture and the result of use of above-mentioned application parts.The method that can realize the above invar alloy material of throat thickness 2mm at present comprises: arc welding and submerged-arc welding, but the invar alloy material of throat thickness 0.5～2mm has not yet to see report.And be easy to generate fire check when adopting the said method welding, it is very harsh to the requirement of composition to add welding wire, the plate sheet welding process is strict to electric arc control, commissure reinforcement phenomenon is obvious, increase the control difficulty and the subsequent treatment process of welding procedure, limited the application of invar alloy solder technology.And laser weld utilizes the laser and the heat effect of material to realize that the fusing of material is connected, the welding process laser beam energy is adjustable continuously, and welded seam area is little, help realizing to light sheet material from fusion welding, need not additionally to dose welding wire and following process and handle, simplified welding procedure; Laser weld has characteristics with short production cycle, that easily be automated in addition, and does not have any pollution, meets the development trend of green manufacturing.
Summary of the invention
Be to solve the problems referred to above that prior art exists, the present invention will design a kind ofly can not need additionally to dose welding wire, can realize the welding forming method of not having the thin invar alloy of obvious positive and negative reinforcement and pore-free crack defect from fusion welding shaping and commissure of 0.5～2mm thickness invar alloy.
To achieve these goals, technical scheme of the present invention is as follows:
A kind of welding forming method of thin invar alloy utilizes the Nd:YAG laser instrument to weld, and may further comprise the steps:
A, clean with the acetone wiping again after handling around will weld seam with mechanical means, guarantee around the butt weld smooth smooth, non-oxidation layer and greasy dirt;
B, the invar alloy that cleaned is fixed in anchor clamps, guarantees that opposite joint is good;
C, be mounted to workbench after invar alloy is fixed in anchor clamps, adjust the relative position and the protective gas pressure that blows side of pulse width, pulse frequency, laser and the thin invar alloy of Nd:YAG laser instrument, determine suitable laser average line energy density;
D, thin invar alloy is formed welding with the laser beam of Nd:YAG laser instrument.
The mass fraction of invar alloy elemental composition of the present invention is: Ni, 35%-37%; Mn, 0.2%-0.6%; Si ,≤0.2%; C ,≤0.05%; P ,≤0.02%; S ,≤0.02%; Fe, surplus.
The pulsed light beam wavelength of Nd:YAG laser instrument of the present invention be 1064nm, pulse width between 6～8ms, frequency between 20～40Hz, guarantee that laser is to the fusing fully of material and the stability in molten bath.
Shaping of the present invention welding by the Online Video system adjust the laser beam foucing position make defocusing amount-3～+ 3mm between, be used for determining rational power density and weld width.
Shaping welding process of the present invention adopts the side-blown argon shield, and pressure is 0.1～0.5MPa.
The pulse laser heat input density of Nd:YAG laser instrument of the present invention is between 100～900J/mm.
Compared with prior art, the present invention has following beneficial effect:
1, because the present invention utilizes laser directly to realize the welding of invar alloy, do not need additionally to dose welding wire when therefore welding.
2, because laser instrument laser pulse width used in the present invention, frequency and defocusing amount are adjustable continuously, can realize being shaped of 0.5～2mm thickness invar alloy from fusion welding.
3, because the pulse laser heat input density of Nd:YAG laser instrument of the present invention between 100～900J/mm, can realize that the commissure do not have obvious positive and negative reinforcement and pore-free crack defect, need not butt welded seam and carry out following process.
4, because the 1064nm laser that the present invention uses can adopt Optical Fiber Transmission, therefore easy to operate, be beneficial to the realization automation.
Description of drawings
2 in the total accompanying drawing of the present invention, wherein:
Fig. 1 is the welding schematic diagram.
Fig. 2 is an invar alloy opposite joint mode schematic diagram.
Among the figure: 1, Online Video system, 2, condenser lens, 3, laser beam, 4, the laser beam foucing position, 5, invar alloy, 6, anchor clamps, 7, weld seam.
The specific embodiment
Below in conjunction with accompanying drawing the present invention is described further.Shown in Fig. 1-2, a kind of welding forming method of thin invar alloy utilizes Nd:YAG laser instrument, Online Video system 1 and condenser lens 2 etc. to weld, and may further comprise the steps:
A, clean with the acetone wiping again after will weld seam handling around 7 with mechanical means, guarantee around the butt weld 7 smooth smooth, non-oxidation layer and greasy dirt;
B, the invar alloy 5 that cleaned is fixed in anchor clamps 6, guarantees that opposite joint is good;
C, be mounted to workbench after invar alloy 5 is fixed in anchor clamps 6, adjust the relative position and the protective gas pressure that blows side of pulse width, pulse frequency, laser and the thin invar alloy 5 of Nd:YAG laser instrument, determine suitable laser average line energy density;
D, form welding with 3 pairs of thin invar alloy 5 of laser beam of Nd:YAG laser instrument.
The mass fraction of invar alloy 5 elemental compositions of the present invention is: Ni, 35%-37%; Mn, 0.2%-0.6%; Si ,≤0.2%; C ,≤0.05%; P ,≤0.02%; S ,≤0.02%; Fe, surplus.
The pulsed light beam wavelength of Nd:YAG laser instrument of the present invention be 1064nm, pulse width between 6～8ms, frequency between 20～40Hz, guarantee that laser is to the fusing fully of material and the stability in molten bath.
Shaping of the present invention welding by Online Video system 1 adjust laser beam foucing position 4 make defocusing amount-3～+ 3mm between, be used for determining rational power density and weld seam 7 width.
Shaping welding process of the present invention adopts the side-blown argon shield, and pressure is 0.1～0.5MPa.
The pulse laser heat input density of Nd:YAG laser instrument of the present invention is between 100～900J/mm.
Claims (6)
1. the welding forming method of a thin invar alloy is characterized in that: utilize the Nd:YAG laser instrument to weld, may further comprise the steps:
A, clean with the acetone wiping again after with mechanical means weld seam (7) being handled on every side, guarantee that butt weld (7) is smooth smooth on every side, non-oxidation layer and greasy dirt;
B, the invar alloy that cleaned (5) is fixed in anchor clamps (6), guarantees that opposite joint is good;
C, be mounted to workbench after invar alloy (5) is fixed in anchor clamps (6), adjust the relative position and the side-blown protective gas pressure of pulse width, pulse frequency, laser and the thin invar alloy (5) of Nd:YAG laser instrument, determine suitable laser average line energy density;
D, thin invar alloy (5) is formed welding with the laser beam (3) of Nd:YAG laser instrument.
2. the welding forming method of a kind of thin invar alloy according to claim 1, it is characterized in that: the mass fraction of described invar alloy (5) elemental composition is: Ni, 35%-37%; Mn, 0.2%-0.6%; Si ,≤0.2%; C ,≤0.05%; P ,≤0.02%; S ,≤0.02%; Fe, surplus.
3. the welding forming method of a kind of thin invar alloy according to claim 1, it is characterized in that: the pulsed light beam wavelength of described Nd:YAG laser instrument be 1064nm, pulse width between 6～8ms, frequency between 20～40Hz, guarantee that laser is to the fusing fully of material and the stability in molten bath.
4. the welding forming method of a kind of thin invar alloy according to claim 1, it is characterized in that: described shaping welding by Online Video system (1) adjust laser beam foucing position (4) make defocusing amount-3～+ 3mm between, be used for definite rational power density and weld seam (7) width.
5. the welding forming method of a kind of thin invar alloy according to claim 1 is characterized in that: described shaping welding process adopts the side-blown argon shield, and pressure is 0.1～0.5MPa.
6. the welding forming method of a kind of thin invar alloy according to claim 1, it is characterized in that: the pulse laser heat input density of described Nd:YAG laser instrument is between 100～900J/mm.
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| CN2011101844348A CN102240851A (en) | 2011-07-01 | 2011-07-01 | Welding forming method of thin invar alloy |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103252577A (en) * | 2012-02-20 | 2013-08-21 | 上海工程技术大学 | Method for controlling dissolution of tungsten carbide of laser welding head interface |
| CN103862173A (en) * | 2014-03-25 | 2014-06-18 | 大连理工大学 | A high-speed laser welding method for invar steel film |
| CN105316576A (en) * | 2014-07-31 | 2016-02-10 | 宝钢特钢有限公司 | FeNi invar alloy with good welding property |
| CN105665933A (en) * | 2016-03-08 | 2016-06-15 | 南京航空航天大学 | Laser-arc hybrid welding method for Invar die steel |
| CN106735904A (en) * | 2016-12-20 | 2017-05-31 | 柳州振业焊接机电设备制造有限公司 | The method for laser welding of aluminium alloy |
| CN107138855A (en) * | 2017-05-05 | 2017-09-08 | 上海航天设备制造总厂 | A kind of method for laser welding of ultra-thin-wall medium carbon steel bridging arrangement |
| CN107866647A (en) * | 2016-09-26 | 2018-04-03 | 宝钢特钢有限公司 | A kind of Fe Ni invar alloy welding wire and its manufacture method |
| CN108436272A (en) * | 2018-06-13 | 2018-08-24 | 沈阳富创精密设备有限公司 | 200mm etching cavities laser is from fusion welding technique |
| CN114367742A (en) * | 2022-02-17 | 2022-04-19 | 上海工程技术大学 | A method for reducing porosity in laser welding of iron-nickel alloys |
| CN115805321A (en) * | 2022-12-12 | 2023-03-17 | 上海无线电设备研究所 | Preparation method of porous structure invar alloy connecting ring based on mixed additive manufacturing |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103252577A (en) * | 2012-02-20 | 2013-08-21 | 上海工程技术大学 | Method for controlling dissolution of tungsten carbide of laser welding head interface |
| CN103862173A (en) * | 2014-03-25 | 2014-06-18 | 大连理工大学 | A high-speed laser welding method for invar steel film |
| CN105316576A (en) * | 2014-07-31 | 2016-02-10 | 宝钢特钢有限公司 | FeNi invar alloy with good welding property |
| CN105665933A (en) * | 2016-03-08 | 2016-06-15 | 南京航空航天大学 | Laser-arc hybrid welding method for Invar die steel |
| CN105665933B (en) * | 2016-03-08 | 2017-06-13 | 南京航空航天大学 | A kind of Invar mould steel laser electrical arc complex welding method |
| CN107866647A (en) * | 2016-09-26 | 2018-04-03 | 宝钢特钢有限公司 | A kind of Fe Ni invar alloy welding wire and its manufacture method |
| CN106735904A (en) * | 2016-12-20 | 2017-05-31 | 柳州振业焊接机电设备制造有限公司 | The method for laser welding of aluminium alloy |
| CN107138855A (en) * | 2017-05-05 | 2017-09-08 | 上海航天设备制造总厂 | A kind of method for laser welding of ultra-thin-wall medium carbon steel bridging arrangement |
| CN108436272A (en) * | 2018-06-13 | 2018-08-24 | 沈阳富创精密设备有限公司 | 200mm etching cavities laser is from fusion welding technique |
| CN114367742A (en) * | 2022-02-17 | 2022-04-19 | 上海工程技术大学 | A method for reducing porosity in laser welding of iron-nickel alloys |
| CN115805321A (en) * | 2022-12-12 | 2023-03-17 | 上海无线电设备研究所 | Preparation method of porous structure invar alloy connecting ring based on mixed additive manufacturing |
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Application publication date: 20111116 |