JPH0520192B2 - - Google Patents
Info
- Publication number
- JPH0520192B2 JPH0520192B2 JP61100683A JP10068386A JPH0520192B2 JP H0520192 B2 JPH0520192 B2 JP H0520192B2 JP 61100683 A JP61100683 A JP 61100683A JP 10068386 A JP10068386 A JP 10068386A JP H0520192 B2 JPH0520192 B2 JP H0520192B2
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- mixed gas
- laser
- welding
- gas
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- Laser Beam Processing (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、アルミニウムやアルミニウム合金
などのアルミニウム系部材のレーザ溶接方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for laser welding aluminum-based members such as aluminum and aluminum alloys.
例えばC02レーザやYAGレーザなどのレーザ光
はエネルギ密度の極めて高い熱源で、レンズやミ
ラーを用いて微小なスポツトに集光できることか
ら、鉄鋼やステンレス鋼などの金属材料や、木
材、アクリル、プラスチツクなどの非金属材料の
切断・溶接など、各種の加工手段として用いられ
るようになつてきている。
For example, laser light such as C0 2 laser or YAG laser is a heat source with extremely high energy density and can be focused on a minute spot using a lens or mirror. It has come to be used as a variety of processing means, such as cutting and welding non-metallic materials such as.
しかし、被加工物として、アルミニウムやアル
ミニウム合金のようなアルミニウム系部材などに
用いると、レーザビームが反射され、十分な吸収
が生じないため、溶接や切断などができない場合
があつた。これらを解決するためには、被加工物
の表面にレーザビーム吸収率を高めるために、カ
ーボン系の表面被覆剤を塗布したり、特別な表面
処理を施す必要があつた。この表面被覆剤を塗布
する方法については、昭和60年度精機学会秋期大
会学術講演論文集（第679頁〜第680頁、発行日・
昭和60年９月24日）「アルミのC02レーザ溶接に
関する基礎研究−表面コーテイングと溶融特性
−」・電子技術総合研究所・安永他に報告されて
いる。 However, when used on an aluminum-based member such as aluminum or an aluminum alloy as a workpiece, the laser beam is reflected and sufficient absorption does not occur, so welding or cutting may not be possible. In order to solve these problems, it was necessary to apply a carbon-based surface coating agent or perform special surface treatment on the surface of the workpiece in order to increase the laser beam absorption rate. Regarding the method of applying this surface coating agent, please refer to the Proceedings of the Academic Lectures at the 1985 Japan Society of Precision Machinery Autumn Conference (pages 679 to 680, publication date and
(September 24, 1985) ``Basic research on C02 laser welding of aluminum - surface coating and melting characteristics'', Electronic Technology Research Institute, Yasunaga et al.
従来の表面被覆剤を用いたり表面処理を施すア
ルミニウム系部材の加工方法により、アルミニウ
ム系部材を切断する際には、表面被覆剤などは蒸
発や燃焼作用により除去されるので、被加工物内
に残留することはなく、加工部の特性を劣化する
ことはない。ところが、アルミニウム系部材同志
を溶接する際には、被加工物の部材が溶融した後
凝固する過程を経るので、表面被覆剤や表面処理
物が溶融金属内に残留し、溶接部の強度低下やブ
ローホール及び割れなどの欠陥を引きおこす原因
となるという問題点があつた。
When cutting aluminum-based parts using conventional processing methods for aluminum-based parts that use surface coating agents or perform surface treatment, the surface coating agents are removed by evaporation or combustion, so there is It does not remain and does not deteriorate the characteristics of the processed part. However, when welding aluminum-based parts together, the workpieces go through a process of melting and then solidifying, so surface coating agents and surface treatments remain in the molten metal, causing a decrease in the strength of the welded part. There was a problem in that it caused defects such as blowholes and cracks.
この発明は上記のような問題点を解決するため
になされたもので、ブローホールや割れなどの溶
接欠陥を生ぜしめることなく、十分な強度を有す
る溶接部を得ることのできるアルミニウム系部材
のレーザ溶接方法を提供することを目的とする。 This invention was made to solve the above-mentioned problems, and it is a laser welding method for aluminum-based members that can obtain welded parts with sufficient strength without causing welding defects such as blowholes and cracks. The purpose is to provide a welding method.
この発明に係るアルミニウム系部材のレーザ溶
接方法は、酸素を含む混合ガスをシールドガスと
し、レーザビームをアルミニウム系部材に照射し
て溶接するようにしたものである。
In the laser welding method for aluminum-based members according to the present invention, a mixed gas containing oxygen is used as a shielding gas, and the aluminum-based members are irradiated with a laser beam for welding.
アルミニウムやアルミニウム合金は溶接時に酸
素、窒素及び水分などの混入を最も嫌うものとさ
れており、純度の高いArやHeなどのシールドガ
スが用いられている。レーザビーム、特にC02レ
ーザによるレーザビームの吸収は被加工物の材質
により大きな影響を受ける。この発明におけるシ
ールドガスは、酸素を含む混合ガスであり、例え
ば酸素とアルゴンの混合ガスの場合には、ビーム
照射部に酸化アルミニウムが生成される。また混
合ガス中に窒素を含む場合には、窒化アルミニウ
ムが生成される。この酸化アルミニウムや窒化ア
ルミニウムはレーザビームの吸収率が高く、表面
被覆剤などを必要とせずにアルミニウム系部材の
レーザ溶接を行うことができる。
Aluminum and aluminum alloys are considered to be the least likely to be contaminated by oxygen, nitrogen, moisture, etc. during welding, and highly pure shielding gases such as Ar and He are used. Absorption of a laser beam, especially a C0 2 laser beam, is greatly affected by the material of the workpiece. The shielding gas in this invention is a mixed gas containing oxygen. For example, in the case of a mixed gas of oxygen and argon, aluminum oxide is produced in the beam irradiation part. Furthermore, when nitrogen is included in the mixed gas, aluminum nitride is produced. These aluminum oxides and aluminum nitrides have a high laser beam absorption rate, and can perform laser welding of aluminum-based members without requiring a surface coating agent or the like.
〔実施例〕
第１図はこの発明の一実施例によるアルミニウ
ム系部材同志のレーザ溶接方法によつて溶接した
溶接部の溶込み深さを示す特性図であり、横軸は
窒素N2と酸素O2による混合ガスをシールドガス
とした場合のシールドガス中のO2の含有量％を
示し、縦軸は溶込み深さmmを示している。この場
合の溶接条件は、例えばレーザとしてC02レーザ
を用い、レーザ出力2.3Kw、溶接速度0.3ｍ／
min、被加工物であるAl合金の材質はJISA1100
を用いている。またシールドガス流量は30／
minで、組成比はN2／O2を０％から100％まで変
化させている。図中、領域はシールドガス中の
O2含有量が15％未満、領域は15％〜90％，領
域は90％を超えた領域であり、それぞれ第２図
，，に示すような形態の溶接ビード断面が
得られる。図において、１はAl部材、２は溶接
金属である。第２図に示されるように領域で
は、溶接金属２の過大な盛り上り部分２ａとアン
ダカツト部２ｂが存在する不良溶接ビードが得ら
れる。また、領域では第２図に示されるよう
に、オーバラツプ部２ｃとアンダフイル部２ｄが
存在する不良ビードが得られる。領域では、第
２図に示されるように、アンダフイル部やアン
ダカツト部のような欠陥を含まない良好な形状の
溶接ビードを得ることができる。また、純N2シ
ールドや純O2シールド状態では形状が第２図，
のようになるばかりでなく、純N2シールドの
場合には溶接ビード表面付近に多量の窒化物を巻
き込み、表面ビードの乱れが激しい。また、純
O2シールドの場合にはブローホールの発生が多
く、良好な溶接は困難である。従つてシールドガ
ス中のO2含有量は15％〜90％が望ましく、特に
15％〜35％にすると、溶込み深さが深く、良好な
溶接部が得られる。[Example] Fig. 1 is a characteristic diagram showing the penetration depth of a welded part welded together by a laser welding method for aluminum-based members according to an embodiment of the present invention. The figure shows the percentage content of O2 in the shielding gas when a mixed gas of O2 is used as the shielding gas, and the vertical axis shows the penetration depth in mm. The welding conditions in this case are, for example, a C0 2 laser, a laser output of 2.3Kw, and a welding speed of 0.3m/
min, the material of the Al alloy that is the workpiece is JISA1100
is used. Also, the shielding gas flow rate is 30/
min, and the composition ratio N 2 /O 2 is varied from 0% to 100%. In the figure, the area is in the shielding gas.
When the O 2 content is less than 15%, the region is 15% to 90%, and the region is greater than 90%, weld bead cross sections of the shapes shown in Fig. 2 are obtained, respectively. In the figure, 1 is an Al member and 2 is a weld metal. In the region shown in FIG. 2, a defective weld bead is obtained in which an excessively raised portion 2a and an undercut portion 2b of the weld metal 2 are present. In addition, as shown in FIG. 2, a defective bead in which an overlap portion 2c and an underfill portion 2d exist is obtained. In this region, as shown in FIG. 2, it is possible to obtain a weld bead with a good shape that does not include defects such as underfill portions and undercut portions. In addition, in the state of pure N 2 shielding and pure O 2 shielding, the shape is as shown in Figure 2.
In addition, in the case of pure N 2 shielding, a large amount of nitride is involved near the weld bead surface, resulting in severe disturbance of the surface bead. Also, pure
In the case of O 2 shielding, blowholes often occur and good welding is difficult. Therefore, the O 2 content in the shielding gas is preferably 15% to 90%, especially
When it is 15% to 35%, the penetration depth is deep and a good welded part can be obtained.
また、第３図はこの発明の他の実施例としてシ
ールドガスを不活性ガスであるアルゴンArとO2
の混合ガスとした時の溶込み深さを示す特性図で
ある。さらに第４図，，はそれぞれ第３図
に示す領域，，のO2含有量のシールドガ
スを用いて得られた溶接ビードを示す断面図であ
る。シールドガスにArとO2の混合ガスを用いた
場合にも効果としてはN2とO2の混合ガスを用い
た場合と同様にO2含有量が15％〜90％の領域
で良好な溶接ビードが得られる。O2含有量が15
％未満の領域及び90％を越える領域ではブロ
ーホール３が多発し、健全な溶接はできない。特
に20％〜50％のO2含有量では残留酸化物が少な
く、強度的にも良好な溶接部が得られる。このレ
ーザ溶接方法では表面被覆剤などを必要としない
ため、これが溶融金属内に残留して引きおこす溶
接部の強度低下やブローホール及び割れなどの欠
陥を防ぐことができる。さらに、この発明によれ
ば、表面処理の工程を必要とせず、シールドガス
の成分を変えるという簡単な操作で実現できる。 In addition, FIG. 3 shows another embodiment of the present invention in which the shielding gas is inert gas Ar and O 2
FIG. 3 is a characteristic diagram showing the penetration depth when a mixed gas is used. Furthermore, FIG. 4 is a cross-sectional view showing a weld bead obtained using a shielding gas having an O 2 content in the region shown in FIG. 3, respectively. When a mixed gas of Ar and O2 is used as the shielding gas, good welding can be achieved in the O2 content range of 15% to 90%, similar to when a mixed gas of N2 and O2 is used. A bead is obtained. O2 content is 15
In areas where it is less than 90% and areas where it is more than 90%, blowholes 3 occur frequently and sound welding cannot be achieved. In particular, with an O 2 content of 20% to 50%, residual oxides are small and welds with good strength can be obtained. Since this laser welding method does not require a surface coating agent, it is possible to prevent defects such as a decrease in the strength of the welded part and blowholes and cracks caused by the agent remaining in the molten metal. Further, according to the present invention, there is no need for a surface treatment process, and it can be realized by a simple operation of changing the components of the shielding gas.
なお、O2との混合ガスを構成する不活性ガス
はArに限らず、ヘリウムHeなどでもよい。ま
た、混合ガス中に炭酸ガスが微量含まれていても
よい。また、レーザとしてCO2レーザに限らず、
YAGレーザなどでもよい。 Note that the inert gas constituting the mixed gas with O 2 is not limited to Ar, but may also be helium He or the like. Further, a trace amount of carbon dioxide gas may be included in the mixed gas. In addition, the laser is not limited to CO 2 laser,
A YAG laser or the like may also be used.
以上述べたように、この発明によれば、酸素を
含む混合ガスをシールドガスとし、レーザビーム
をアルミニウム系部材に照射して溶接することに
より、ブローホールや割れなどの溶接欠陥の発生
を防ぐことができ、十分な強度を有する溶接部を
得ることのできるアルミニウム系部材のレーザ溶
接方法を提供できる効果がある。
As described above, according to the present invention, the generation of welding defects such as blowholes and cracks can be prevented by irradiating and welding aluminum-based members with a laser beam using a mixed gas containing oxygen as a shielding gas. The present invention has the effect of providing a laser welding method for aluminum-based members that can obtain a welded part with sufficient strength.
第１図はこの発明の一実施例によるアルミニウ
ム系部材のレーザ溶接方法に係るシールドガス中
のO2含有量に対する溶込み深さを示す特性図、
第２図，，はそれぞれ一実施例によつて溶
接した溶接部の一部断面図、第３図はこの発明の
他の実施例によるシールドガス中のO2含有量に
対する溶込み深さを示す特性図、第４図，，
はそれぞれ他の実施例によつて溶接した溶接部
の一部断面図である。
１……アルミニウム系部材、２……溶接金属。
なお、図中、同一符号は同一、又は相当部分を示
す。
FIG. 1 is a characteristic diagram showing the penetration depth versus O 2 content in the shielding gas according to the laser welding method for aluminum-based members according to an embodiment of the present invention;
2 and 2 are partial cross-sectional views of welded parts welded according to one embodiment, and FIG. 3 shows the penetration depth versus O 2 content in the shielding gas according to another embodiment of the present invention. Characteristic diagram, Fig. 4,,
3A and 3B are partial cross-sectional views of welded parts welded according to other embodiments, respectively. 1... Aluminum-based member, 2... Welded metal.
In addition, in the figures, the same reference numerals indicate the same or equivalent parts.
Claims (1)
ーザビームをアルミニウム系部材に照射して溶接
するアルミニウム系部材のレーザ溶接方法。 ２ 混合ガスは、酸素と窒素を含むガスであるこ
とを特徴とする特許請求の範囲第１項記載のアル
ミニウム系部材のレーザ溶接方法。 ３ 混合ガスは、酸素と不活性ガスを含むガスで
あることを特徴とする特許請求の範囲第１項記載
のアルミニウム系部材のレーザ溶接方法。 ４ 混合ガス中の酸素の混合割合は、15％〜90％
であることを特徴とする特許請求の範囲第１項な
いし第３項のいずれかに記載のアルミニウム系部
材のレーザ溶接方法。 ５ 混合ガス中の酸素の混合割合は、15％〜35％
であることを特徴とする特許請求の範囲第２項記
載のアルミニウム系部材のレーザ溶接方法。 ６ 混合ガス中の酸素の混合割合は、20％〜50％
であることを特徴とする特許請求の範囲第３項記
載のアルミニウム系部材のレーザ溶接方法。[Scope of Claims] 1. A laser welding method for aluminum-based members, in which a mixed gas containing oxygen is used as a shielding gas, and the aluminum-based members are irradiated with a laser beam for welding. 2. The method for laser welding aluminum-based members according to claim 1, wherein the mixed gas is a gas containing oxygen and nitrogen. 3. The method for laser welding aluminum-based members according to claim 1, wherein the mixed gas is a gas containing oxygen and an inert gas. 4 The mixing ratio of oxygen in the mixed gas is 15% to 90%.
A laser welding method for aluminum-based members according to any one of claims 1 to 3, characterized in that: 5 The mixing ratio of oxygen in the mixed gas is 15% to 35%.
A laser welding method for aluminum-based members according to claim 2, characterized in that: 6 The mixing ratio of oxygen in the mixed gas is 20% to 50%.
A laser welding method for aluminum-based members according to claim 3, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61100683A JPS62254992A (en) | 1986-04-30 | 1986-04-30 | Laser welding method of aluminum member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61100683A JPS62254992A (en) | 1986-04-30 | 1986-04-30 | Laser welding method of aluminum member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62254992A JPS62254992A (en) | 1987-11-06 |
| JPH0520192B2 true JPH0520192B2 (en) | 1993-03-18 |
Family
ID=14280542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61100683A Granted JPS62254992A (en) | 1986-04-30 | 1986-04-30 | Laser welding method of aluminum member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62254992A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0259189A (en) * | 1988-08-26 | 1990-02-28 | Toshiba Corp | Laser welding method for aluminum material and welded parts thereof |
| JP2736182B2 (en) * | 1991-02-28 | 1998-04-02 | ファナック株式会社 | Laser device and laser welding method |
| JPH0679484A (en) * | 1992-07-14 | 1994-03-22 | Mitsubishi Electric Corp | Laser welding method |
| ATE283143T1 (en) † | 2001-03-06 | 2004-12-15 | Linde Ag | LASER WELDING OF NON-FERROUS METALS USING LASER DIODES UNDER PROCESS GAS |
| JP5232840B2 (en) | 2010-09-03 | 2013-07-10 | 日立ビークルエナジー株式会社 | Secondary battery and manufacturing method thereof |
| JP7598274B2 (en) * | 2021-03-24 | 2024-12-11 | 株式会社東芝 | Welding method |
-
1986
- 1986-04-30 JP JP61100683A patent/JPS62254992A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62254992A (en) | 1987-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EXPY | Cancellation because of completion of term |