JPH03257183A - Aluminum and aluminum alloy material having superior weldability - Google Patents
Aluminum and aluminum alloy material having superior weldabilityInfo
- Publication number
- JPH03257183A JPH03257183A JP5749890A JP5749890A JPH03257183A JP H03257183 A JPH03257183 A JP H03257183A JP 5749890 A JP5749890 A JP 5749890A JP 5749890 A JP5749890 A JP 5749890A JP H03257183 A JPH03257183 A JP H03257183A
- Authority
- JP
- Japan
- Prior art keywords
- aluminum
- oxidized film
- thickness
- aluminum alloy
- weldability
- 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.)
- Pending
Links
- 229910000838 Al alloy Inorganic materials 0.000 title claims abstract description 20
- 239000000956 alloy Substances 0.000 title claims abstract description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 15
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 6
- 239000002344 surface layer Substances 0.000 claims abstract description 6
- 239000011777 magnesium Substances 0.000 claims description 15
- 229910052782 aluminium Inorganic materials 0.000 claims description 13
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 9
- 229910052749 magnesium Inorganic materials 0.000 claims description 9
- 230000003449 preventive effect Effects 0.000 claims description 4
- 238000003466 welding Methods 0.000 abstract description 19
- 239000000463 material Substances 0.000 abstract description 11
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract description 2
- 238000000576 coating method Methods 0.000 abstract description 2
- 229910052760 oxygen Inorganic materials 0.000 abstract description 2
- 239000001301 oxygen Substances 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 abstract 2
- 238000012360 testing method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 230000001680 brushing effect Effects 0.000 description 3
- 230000003750 conditioning effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000005303 weighing Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001420 photoelectron spectroscopy Methods 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910000881 Cu alloy Inorganic materials 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- ZTXONRUJVYXVTJ-UHFFFAOYSA-N chromium copper Chemical compound [Cr][Cu][Cr] ZTXONRUJVYXVTJ-UHFFFAOYSA-N 0.000 description 1
- 239000012459 cleaning agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 210000003127 knee Anatomy 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 229910000162 sodium phosphate Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 210000003454 tympanic membrane Anatomy 0.000 description 1
Abstract
Description
（産業上利用分野）
本発明は溶接性に優れたアルミニウム及びアルミニウム
合金（以下、総称して「アルミニウム合金」と記す）材
料に係り、自動車、車両、航空機或いは電気機器用等で
溶接して用いられるアルミニウム合金材料に関するもの
である。
（従来の技術及び解決しようとする課題）アルミニウム
合金材料は、その軽量性のほか、成形性や耐食性の点で
優れているため、自動車、車両、航空機などの運送関係
、或いは電気機器関係等々の部材として用いられており
、溶接によって接合され、使用される場合が多い。
ところで、アルミニウム合金材料は、その表面の酸化皮
膜が緻密で融点が高いため、溶接性を阻害する要因とな
り、特に熱処理によって酸化皮膜が厚く生成した場合に
は、ワイヤーブラシかけ等による酸化皮膜の破壊処理が
必要とされていた。
しかし、このような破壊処理は溶接箇所のみに且つ溶接
直前に施す必要があるが、その作業は煩雑であって、必
要箇所のみの酸化皮膜を完全に除去することも困難であ
り、ひいては溶接欠陥の発生を招き、コストアップの原
因ともなっていた。
本発明は、か）る状況を鑑みて、溶接、特に抵抗スポッ
ト溶接の直前にワイヤーブラシがけ等の酸化皮膜の除去
作業の省略を可能とする溶接性に優れたアルミニウム合
金材を提供することを目的とするものである。
（課題を解決するための手段）
前記目的を達成するために、本発明者は、酸化皮膜の性
状並びに溶接性との関連について効果的な対策を見い出
すべく鋭意研究を重ねた結果、ここに本発明をなしたも
のである。
すなわち、本発明は、アルミニウム及びアルミニウム合
金材の酸化皮膜が厚さ７０Å以下に調整されており、か
つ、両面に０．１〜７ｇ／ｍ２の防錆油が塗布されてい
ることを特徴とする溶接性に優れたアルミニウム及びア
ルミニウム合金材を要旨とするものである。
また、他の本発明は、前記表面層におけるマグネシウム
とアルミニウムの比（Ｍｇ／Ａ Ｉ２）が原子％で０．
７以下であることを特徴とするものである。
以下に本発明を更に詳述する。
（作用）
前述の如く、アルミニウム合金材においては、酸化皮膜
は溶接性、特にスポット溶接性を阻害するものである。
しかし、本発明者の研究によれば、酸化皮膜の厚さを７
０Å以下に調整するならば１、実用上の問題は少ないこ
とが判明した。
このような酸化鼓膜厚さの調整法としては、化学的方法
、機械的方法、或いはその他の適当な方法により可能で
ある。
例えば、機械的性質を調整するための熱処理によって成
長した酸化皮膜は、エツチングタイプのアルカリ洗浄剤
（例えば、りん酸ソーダ、炭酸ソーダ、苛性ソーダ等）
や、酸類（硝酸、硫酸等）によって効果的に低減できる
。また、圧延乃至はブラッシング等の機械的手段によっ
ても、酸化皮膜を破壊することが可能である。
しかして、酸化皮膜の厚さを調整した後、空気中の水分
、酸素等との接触を防止し、酸化皮膜の成長を抑制する
ために、両面に防錆油を０．１〜７ｇ／ｍ２塗布する。
その際、塗布量がＱ、１ｇ／ｍ”未満ではその効果は充
分でなく、また７ｇ／ｍ２を超えるとその効果は飽和す
るだけでなく、かえって溶接性そのものを阻害するよう
になるので望ましくない。
アルミニウム合金がマグネシウムを含有する成分系（例
えば、ＪＩＳ５１８２など）の場合は、表面にマグネシ
ウムが濃縮された酸化皮膜が形成され、溶接性を阻害す
ることがある。しかし、本発明者の研究によれば、上述
の酸化皮膜の厚さ調整に加えて、表面層におけるマグネ
シウムとアルミニウムの比（Ｍｇ／ Ａ Ｑ ）を原子
％で０．７以下に調整することにより健全な溶接接合が
得られることが判明した。なお、マグネシウムとアルミ
ニウムの比は光電子分光分析により測定可能であるが、
ここで云うマグネシウム及びアルミニウムとは、Ｍｇ金
属、ＡＱ金金属ほか、マグネシウム皺化物中のＭｇ威分
及びアルミニウム酸化物中のへ２成分もカウントされる
値である。また、表面調整の具体的な手段は前述した通
りの方法でよい。
なお、前述の防錆油としては適当なものを用いることが
でき、特には制限されない。
次に本発明の実施例を示す。
（実施例）
第１表に示す各種の品種、調質のアルミニウム又はアル
ミニウム合金について、板厚１■の板材に第１表に示す
表面調整及び塗油を施して供試材とし、その２５ｍｍｗ
Ｘ５０ｍｍ１２の寸法の試験片を以下の溶接条件で２枚
重ねスポット溶接して、溶接性を評価した。
〔溶接条件〕
電 極＝１６１１１１φのクロム−銅合金で先端半径
５０鳳朧のＲ形
加圧パターンニー段一定加圧７００ｋｇ主通電時間：９
サイクル
電 流：約３８ＫＡ
なお、供試材は、３５℃、相対湿度８５％の雰囲気に１
週間放置後、溶接試験に供した。
また、溶接性の評価は、３０点の溶接強度（剪断強さ）
を求め、溶接強度の変動（平均からの変動最大値）が５
０ｋｇ以内のものを良（０）、５０〜１００ｋｇのもの
をやや良（Δ）、１００ｋｇ以上のものを不良（×）と
した。
酸化皮膜の厚さは静電容量法により求めた。但し、誘電
率を７とした。また、表面層のマグネシウムとアルミニ
ウムの原子％の比は光電子分光分析により求めた。
これらの試験結果を第１表に併記するが、本発明材はい
ずれも溶接性が良好であることがわかる。
特にＭｇ含有アルミニウム合金材の場合には、表面層の
Ｍｇ１ＡＱ比を規制することにより良好な溶接性を確保
できる。
一方、比較材は良好な溶接性が得られていない。
酸化皮膜厚さを７０Ａ以下に表面調整した場合でも（恥
８、恥１０）、塗油しないか或いは過剰の塗油を行うと
溶接性の低下を招いている。
なお、このスポット溶接試験の結果より、他の溶接法の
場合においても優れた溶接性が得られることは明らかで
ある。(Industrial Application Field) The present invention relates to aluminum and aluminum alloy (hereinafter collectively referred to as "aluminum alloy") materials that have excellent weldability, and are used by welding in automobiles, vehicles, aircraft, electrical equipment, etc. The invention relates to aluminum alloy materials. (Prior art and problems to be solved) Aluminum alloy materials are lightweight, have excellent formability and corrosion resistance, and are therefore used in transportation-related applications such as automobiles, vehicles, and aircraft, as well as electrical equipment-related applications. It is used as a member and is often joined by welding. By the way, the oxide film on the surface of aluminum alloy materials is dense and has a high melting point, which is a factor that inhibits weldability. Especially when a thick oxide film is formed by heat treatment, the oxide film may be destroyed by wire brushing, etc. processing was required. However, such destructive treatment needs to be applied only to the welding area immediately before welding, but this work is complicated and it is difficult to completely remove the oxide film only from the necessary areas, which can lead to welding defects. This led to the occurrence of problems, which led to an increase in costs. In view of the above situation, the present invention aims to provide an aluminum alloy material with excellent weldability that makes it possible to omit oxide film removal work such as wire brushing immediately before welding, especially resistance spot welding. This is the purpose. (Means for Solving the Problems) In order to achieve the above object, the present inventor has conducted extensive research to find effective measures regarding the properties of oxide films and their relationship with weldability, and as a result has hereby presented the present invention. It is an invention. That is, the present invention is characterized in that the oxide film of the aluminum and aluminum alloy material is adjusted to a thickness of 70 Å or less, and that both surfaces are coated with 0.1 to 7 g/m2 of rust preventive oil. This article focuses on aluminum and aluminum alloy materials with excellent weldability. Further, in another aspect of the present invention, the ratio of magnesium to aluminum (Mg/A I2) in the surface layer is 0.0 at %.
It is characterized by being 7 or less. The present invention will be explained in further detail below. (Function) As mentioned above, in aluminum alloy materials, oxide films impede weldability, particularly spot weldability. However, according to the research of the present inventor, the thickness of the oxide film was reduced to 7
It has been found that if the thickness is adjusted to 0 Å or less, there are few practical problems. The thickness of the oxidized eardrum can be adjusted by chemical methods, mechanical methods, or other suitable methods. For example, an oxide film grown by heat treatment to adjust mechanical properties can be removed using an etching type alkaline cleaning agent (e.g., sodium phosphate, soda carbonate, caustic soda, etc.).
or acids (nitric acid, sulfuric acid, etc.). The oxide film can also be destroyed by mechanical means such as rolling or brushing. After adjusting the thickness of the oxide film, 0.1 to 7 g/m2 of rust preventive oil is applied to both sides to prevent contact with moisture, oxygen, etc. in the air and to suppress the growth of the oxide film. Apply. In this case, if the coating amount is less than Q, 1 g/m2, the effect will not be sufficient, and if it exceeds 7 g/m2, the effect will not only be saturated, but will also impede weldability itself, which is not desirable. If the aluminum alloy has a component system containing magnesium (for example, JIS 5182), an oxide film with concentrated magnesium may be formed on the surface, which may impede weldability.However, the inventor's research According to the above, in addition to adjusting the thickness of the oxide film, a sound welded joint can be obtained by adjusting the ratio of magnesium to aluminum (Mg/AQ) in the surface layer to 0.7 or less in atomic percent. It was found that the ratio of magnesium to aluminum can be measured by photoelectron spectroscopy;
Magnesium and aluminum referred to here are values that include Mg metal, AQ gold metal, as well as Mg content in magnesium corrugated material and H2 component in aluminum oxide. Further, the specific means for surface conditioning may be the same as described above. Note that any suitable rust preventive oil may be used and is not particularly limited. Next, examples of the present invention will be shown. (Example) For the various types and heat-treated aluminum or aluminum alloys shown in Table 1, the surface conditioning and oiling shown in Table 1 were applied to the plate materials with a thickness of 1 cm to prepare test materials, and the 25 mmw
Weldability was evaluated by spot welding two test pieces with dimensions of 50mm x 12 under the following welding conditions. [Welding conditions] Electrode = 161111φ chromium-copper alloy, tip radius 50mm, R-shaped pressure pattern, knee stage constant pressure 700kg, main current application time: 9
Cycle current: Approximately 38 KA The test material was placed in an atmosphere of 35°C and 85% relative humidity.
After being left for a week, it was subjected to a welding test. In addition, weldability evaluation is based on welding strength (shear strength) at 30 points.
The variation in welding strength (maximum variation from the average) is 5.
Those weighing less than 0 kg were rated good (0), those weighing 50 to 100 kg were rated fair (Δ), and those weighing 100 kg or more were rated poor (×). The thickness of the oxide film was determined by the capacitance method. However, the dielectric constant was set to 7. Further, the atomic percent ratio of magnesium and aluminum in the surface layer was determined by photoelectron spectroscopy. These test results are also listed in Table 1, and it can be seen that all the materials of the present invention have good weldability. Particularly in the case of Mg-containing aluminum alloy materials, good weldability can be ensured by regulating the Mg1AQ ratio of the surface layer. On the other hand, the comparative material did not have good weldability. Even when the surface is adjusted to have an oxide film thickness of 70A or less (8th grade, 10th grade), if no oil is applied or excessive oil is applied, weldability deteriorates. Note that from the results of this spot welding test, it is clear that excellent weldability can be obtained even in the case of other welding methods.
（発明の効果）
以上詳述したように、本発明によれば、アルミニウム及
びアルミニウム合金材が表面調整後に塗油しであるので
、優れた溶接性を具備しており、したがって、各種用途
における溶接に際して溶接直前に酸化皮膜除去などの煩
雑な作業が不要となり、その実用上の効果は顕著である
。(Effects of the Invention) As detailed above, according to the present invention, since aluminum and aluminum alloy materials are coated with oil after surface conditioning, they have excellent weldability. This eliminates the need for complicated operations such as removing an oxide film immediately before welding, and its practical effects are significant.
Claims (2)
が厚さ７０Å以下に調整されており、かつ、両面に０．
１〜７ｇ／ｍ＾２の防錆油が塗布されていることを特徴
とする溶接性に優れたアルミニウム及びアルミニウム合
金材。(1) The oxide film on the aluminum and aluminum alloy material is adjusted to a thickness of 70 Å or less, and the thickness is adjusted to 0.0 Å or less on both sides.
Aluminum and aluminum alloy materials with excellent weldability characterized by being coated with 1 to 7 g/m^2 of rust preventive oil.
（Ｍｇ／Ａｌ）が原子％で０．７以下である請求項１に
記載の溶接性に優れたアルミニウム及びアルミニウム合
金材。(2) The aluminum and aluminum alloy material with excellent weldability according to claim 1, wherein the ratio of magnesium to aluminum (Mg/Al) in the surface layer is 0.7 or less in atomic %.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5749890A JPH03257183A (en) | 1990-03-08 | 1990-03-08 | Aluminum and aluminum alloy material having superior weldability |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5749890A JPH03257183A (en) | 1990-03-08 | 1990-03-08 | Aluminum and aluminum alloy material having superior weldability |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03257183A true JPH03257183A (en) | 1991-11-15 |
Family
ID=13057395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5749890A Pending JPH03257183A (en) | 1990-03-08 | 1990-03-08 | Aluminum and aluminum alloy material having superior weldability |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03257183A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0657464A (en) * | 1992-07-29 | 1994-03-01 | Kawasaki Steel Corp | Aluminum material excellent in spot resistance weldability and workability |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60187483A (en) * | 1984-02-15 | 1985-09-24 | アルカン・インターナシヨナル・リミテツド | Pre-treatment of metal for resistance spot welding of aluminum |
| JPS63105998A (en) * | 1986-10-21 | 1988-05-11 | Furukawa Alum Co Ltd | Drawn material of aluminum and aluminum alloy having superior resistance weldability |
| JPH01319692A (en) * | 1988-06-17 | 1989-12-25 | Kobe Steel Ltd | Production of mg-containing aluminum alloy sheet having excellent degreasing property |
| JPH0257692A (en) * | 1988-08-22 | 1990-02-27 | Nissan Motor Co Ltd | Aluminum alloy member for automobile |
| JPH02115385A (en) * | 1988-10-24 | 1990-04-27 | Kobe Steel Ltd | Oil-coated aluminum alloy sheet having excellent degreasing property |
| JPH03140498A (en) * | 1989-10-27 | 1991-06-14 | Sumitomo Light Metal Ind Ltd | Surface treatment of mg-containing al for automobile |
-
1990
- 1990-03-08 JP JP5749890A patent/JPH03257183A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60187483A (en) * | 1984-02-15 | 1985-09-24 | アルカン・インターナシヨナル・リミテツド | Pre-treatment of metal for resistance spot welding of aluminum |
| JPS63105998A (en) * | 1986-10-21 | 1988-05-11 | Furukawa Alum Co Ltd | Drawn material of aluminum and aluminum alloy having superior resistance weldability |
| JPH01319692A (en) * | 1988-06-17 | 1989-12-25 | Kobe Steel Ltd | Production of mg-containing aluminum alloy sheet having excellent degreasing property |
| JPH0257692A (en) * | 1988-08-22 | 1990-02-27 | Nissan Motor Co Ltd | Aluminum alloy member for automobile |
| JPH02115385A (en) * | 1988-10-24 | 1990-04-27 | Kobe Steel Ltd | Oil-coated aluminum alloy sheet having excellent degreasing property |
| JPH03140498A (en) * | 1989-10-27 | 1991-06-14 | Sumitomo Light Metal Ind Ltd | Surface treatment of mg-containing al for automobile |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0657464A (en) * | 1992-07-29 | 1994-03-01 | Kawasaki Steel Corp | Aluminum material excellent in spot resistance weldability and workability |
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