JP4280670B2 - 鋼/アルミニウムの接合構造体 - Google Patents
鋼/アルミニウムの接合構造体 Download PDFInfo
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- JP4280670B2 JP4280670B2 JP2004135446A JP2004135446A JP4280670B2 JP 4280670 B2 JP4280670 B2 JP 4280670B2 JP 2004135446 A JP2004135446 A JP 2004135446A JP 2004135446 A JP2004135446 A JP 2004135446A JP 4280670 B2 JP4280670 B2 JP 4280670B2
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- Prior art keywords
- aluminum
- mass
- steel
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- 229910052782 aluminium Inorganic materials 0.000 title claims description 73
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims description 73
- 229910000831 Steel Inorganic materials 0.000 title claims description 51
- 239000010959 steel Substances 0.000 title claims description 51
- 238000007747 plating Methods 0.000 claims description 42
- 229910018084 Al-Fe Inorganic materials 0.000 claims description 38
- 229910018192 Al—Fe Inorganic materials 0.000 claims description 38
- 229910002056 binary alloy Inorganic materials 0.000 claims description 34
- 238000003466 welding Methods 0.000 claims description 29
- 229910002058 ternary alloy Inorganic materials 0.000 claims description 18
- 229910000838 Al alloy Inorganic materials 0.000 claims description 16
- 229910018191 Al—Fe—Si Inorganic materials 0.000 claims description 16
- 238000005304 joining Methods 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 90
- 239000000463 material Substances 0.000 description 37
- 239000000203 mixture Substances 0.000 description 8
- 229910000680 Aluminized steel Inorganic materials 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 6
- 229910045601 alloy Inorganic materials 0.000 description 5
- 239000000956 alloy Substances 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 5
- 229910000765 intermetallic Inorganic materials 0.000 description 5
- 230000035882 stress Effects 0.000 description 4
- 229910000881 Cu alloy Inorganic materials 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229910001335 Galvanized steel Inorganic materials 0.000 description 2
- 229910019018 Mg 2 Si Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008397 galvanized steel Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000001226 reprecipitation Methods 0.000 description 2
- 238000009864 tensile test Methods 0.000 description 2
- 230000008719 thickening Effects 0.000 description 2
- 229910000851 Alloy steel Inorganic materials 0.000 description 1
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 101000993059 Homo sapiens Hereditary hemochromatosis protein Proteins 0.000 description 1
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 229910000954 Medium-carbon steel Inorganic materials 0.000 description 1
- -1 Si: 0.11% by mass Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 238000005219 brazing Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052712 strontium Inorganic materials 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Images
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- Resistance Welding (AREA)
- Coating With Molten Metal (AREA)
Description
アルミニウム又はアルミニウム合金には、好ましくはFe含有量が1.0質量%以下に規制され、必要に応じてMg:0.1〜6.0質量%,Si:3.0質量%以下を含むアルミニウム合金が使用される。
たとえば、Feの再析出しがたい或いは遅延する溶融Alを生成するめっき層組成に調整すると、Feの再析出が完了する前に溶融Alが凝固し、Al-Fe二元合金層7が十分に生成していない接合界面が形成される。Feの再析出を抑制又は遅延させる上で、Si:3〜12質量%,Fe:0.5〜5質量%を含む溶融アルミニウムめっき層が好適である。当該組成のめっき層は、予めFe濃度を高くしているので下地鋼5から溶融Alに溶け込むFe量,ひいては再析出するFe量が少なくなる。また、Si濃度が高いため、Al-Fe-Si三元合金層6から溶融AlへのSiの溶込みが抑えられ、スポット溶接時に高温加熱された後でも残存するAl-Fe-Si三元合金層6の割合が高くなる。
めっき原板を溶融アルミニウムめっき浴に浸漬して引き上げると、めっき原板に随伴して溶融めっき浴から持ち上げられた溶融めっき金属が凝固して溶融アルミニウムめっき層を形成する。溶融アルミニウムめっき層の厚みは、引上げ直後の鋼帯に対するワイピングガス吹付け等の付着量制御によって調整されるが、厚膜にするほどAl-Fe二元合金層の成長が遅延するので5μm以上にすることが好ましい。
溶融アルミニウムめっき鋼板,アルミニウム合金板から切り出した試験片を脱脂・洗浄した後、重ね合わせてスポット溶接用の電極間に挟み込み、3kNの圧力を加えた。電極には径16mm,先端アール20mmの銅合金チップを用い、溶接電流を10〜27kAの範囲に設定してスポット溶接した。
相手材には、Si:0.11質量%,Fe:0.25質量%,Mg:5.52質量%,Cu:0.02質量%,Zn:0.01質量%,残部Alで板厚1.0mmのアルミニウム合金板を使用した。
作製された鋼/アルミニウム接合構造体の接合強度を引張り剪断試験,十字引張剪断試験で測定した。表2の測定結果にみられるように、溶融アルミニウムめっき層のSi,Fe濃度が適正範囲(Si:3〜12質量%,Fe:0.5〜5質量%)に維持されると、引張り剪断強度:3.5kN以上.十字引張り強度:1.3kN以上と高い接合強度であった。
Claims (4)
- 溶融アルミニウムめっき鋼板にアルミニウム又はアルミニウム合金をスポット溶接で積層した接合構造体であり、溶融アルミニウムめっき層がSi:3〜12質量%,Fe:0.5〜5質量%,残部実質的にAlの組成をもち、N:0.002〜0.020質量%を含む鋼板を下地鋼とし、該下地鋼と溶融アルミニウムめっき層の界面にN:3.0原子%以上のN濃縮層が形成されていて、かつナゲットの接合界面にAl-Fe二元合金層及びAl-Fe-Si三元合金層が互いに入り組んだ混在領域があることを特徴とする鋼/アルミニウムの接合構造体。
- Al-Fe二元合金層が15μm以下の厚さに抑えられている請求項1記載の接合構造体。
- アルミニウム又はアルミニウム合金のFe含有量が1.0質量%以下に規制されている請求項1記載の接合構造体。
- 請求項1又は3記載のアルミニウム合金がMg:0.1〜6.0質量%,Si:3.0質量%以下を含むアルミニウム合金である接合構造体。
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JP2004135446A JP4280670B2 (ja) | 2004-04-30 | 2004-04-30 | 鋼/アルミニウムの接合構造体 |
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Publications (2)
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JP2005313210A JP2005313210A (ja) | 2005-11-10 |
JP4280670B2 true JP4280670B2 (ja) | 2009-06-17 |
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JP2004135446A Expired - Lifetime JP4280670B2 (ja) | 2004-04-30 | 2004-04-30 | 鋼/アルミニウムの接合構造体 |
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Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10625367B2 (en) * | 2016-04-08 | 2020-04-21 | GM Global Technology Operations LLC | Method of resistance spot welding aluminum to steel |
JP7021591B2 (ja) * | 2018-03-30 | 2022-02-17 | 日本製鉄株式会社 | 接合構造体およびその製造方法 |
JP7003806B2 (ja) * | 2018-03-30 | 2022-01-21 | 日本製鉄株式会社 | 接合構造体およびその製造方法 |
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