JPH11335768A - Aluminum alloy material for projection welding nut - Google Patents
Aluminum alloy material for projection welding nutInfo
- Publication number
- JPH11335768A JPH11335768A JP14129698A JP14129698A JPH11335768A JP H11335768 A JPH11335768 A JP H11335768A JP 14129698 A JP14129698 A JP 14129698A JP 14129698 A JP14129698 A JP 14129698A JP H11335768 A JPH11335768 A JP H11335768A
- Authority
- JP
- Japan
- Prior art keywords
- welding
- aluminum alloy
- alloy material
- nut
- aluminum
- 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.)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、抵抗溶接方法の一
種であるプロジェクション溶接用のナットを製造するの
に用いられるＡｌ−Ｍｇ系アルミニウム合金材に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an Al-Mg-based aluminum alloy material used for manufacturing a nut for projection welding, which is a kind of resistance welding method.
【０００２】[0002]
【従来の技術】プロジェクション溶接は、一方の被溶接
材に予め突起（プロジェクション）を形成しておき、こ
の突起を他方の被溶接材に接触させ、この接触部分に電
流と加圧力を集中することで発熱効率を高めた抵抗溶接
法である。これは例えば自動車産業などでは、ボルト、
ナット等の冷間鍛造品の溶接に用いられることの多い技
術で、車両の軽量化などからアルミニウム合金の使用比
率が増大している近年、アルミニウム合金製ナットを用
いたプロジェクション溶接技術の確立が要望されてい
る。しかし、アルミニウム合金は熱伝導性が高いうえ、
表面に高融点の酸化皮膜が生じており、そのままでは溶
接強度が低く、一般的には抵抗溶接には不向きである。
すなわち、従来の方法においてアルミニウム合金製のナ
ット又は押出形材を用いる場合、押出成形性からＪＩＳ
６０００系の、いわゆるＡｌ−Ｍｇ−Ｓｉ系合金を用
いているが、Ａｌ−Ｍｇ−Ｓｉ系合金はアルミニウム合
金の中でも導電率が高く、溶融開始温度も純アルミニウ
ムに近く高い。このため、抵抗スポット溶接を行う際に
は材料が発熱しにくく、溶接電流を高くしないと一定の
溶接強度が得られないという問題がある。そのため、こ
のアルミニウム合金材料に関して、次のようにいくつか
の抵抗溶接の方法が提案されているものの工業的実施の
観点から必ずしも満足できるものではない。例えば特開
平２−２０９６１１号においては、ＪＩＳ ６０００系
アルミニウム合金製のナットをＪＩＳ ５０００系アル
ミニウム合金製の板に固定するために、両翼を設けた押
出形材にネジ孔をあけナット状にし、その両翼を板面に
スポット溶接する方法が提案されているが、施工工数が
かかるという問題がある。また、アルミニウム合金製ナ
ットとアルミニウム合金板の間にアルミニウムのインサ
ート材を挿入して溶接する方法（特公平６−６３７５９
号）、鋼製ナット全面にアルミニウムの被覆を施しスポ
ット溶接する方法（特開平６−１２３３０７号）、同じ
く鋼製ナットにアルミニウムのプレートをかしめ、アル
ミニウム合金板とプレートとをスポット溶接する方法
（実用新案登録第１９９００００号）なども提案されて
いるが、いずれもナットと板とを直接溶接することがで
きず、手間がかかるという欠点を有する。2. Description of the Related Art In projection welding, a projection (projection) is previously formed on one material to be welded, and this projection is brought into contact with the other material to be welded, and current and pressure are concentrated on the contact portion. This is a resistance welding method with improved heat generation efficiency. This is, for example, in the automotive industry, bolts,
This technology is often used for welding cold forged products such as nuts.The use of aluminum alloy is increasing due to the weight reduction of vehicles.In recent years, there is a demand for the establishment of projection welding technology using aluminum alloy nuts. Have been. However, aluminum alloy has high thermal conductivity,
Since a high melting point oxide film is formed on the surface, the welding strength is low as it is, and is generally not suitable for resistance welding.
That is, when an aluminum alloy nut or an extruded shape is used in the conventional method, the JIS is used based on the extrudability.
Although a so-called 6000-based Al-Mg-Si-based alloy is used, the Al-Mg-Si-based alloy has a high conductivity among aluminum alloys and a melting start temperature close to that of pure aluminum. For this reason, when performing resistance spot welding, there is a problem that the material hardly generates heat, and a constant welding strength cannot be obtained unless the welding current is increased. Therefore, although several resistance welding methods have been proposed for this aluminum alloy material as described below, they are not always satisfactory from the viewpoint of industrial implementation. For example, in Japanese Patent Application Laid-Open No. Hei 2-209611, in order to fix a nut made of JIS 6000 series aluminum alloy to a plate made of JIS 5000 series aluminum alloy, a screw hole is formed in an extruded member having both wings, and the nut is formed. Although a method of spot welding both wings to a plate surface has been proposed, there is a problem that the number of construction steps is increased. Further, a method of welding by inserting an aluminum insert material between an aluminum alloy nut and an aluminum alloy plate (Japanese Patent Publication No. 6-63759).
No.), a method of spot-welding a steel nut by applying an aluminum coating on the entire surface (Japanese Patent Laid-Open No. 6-123307), and a method of spot-welding an aluminum alloy plate and a plate by caulking an aluminum plate to a steel nut. Although new model registration No. 19900000) and the like have been proposed, none of them has a drawback that the nut and the plate cannot be directly welded and it takes time and effort.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、このような
従来のアルミニウム合金材料の問題点を克服し、良好な
成形性、加工性を有するとともに、抵抗溶接を行いやす
く、高い溶接強度の得られる、プロジェクション溶接ナ
ット用アルミニウム合金材を提供することを目的とす
る。SUMMARY OF THE INVENTION The present invention overcomes such problems of the conventional aluminum alloy materials, has good formability and workability, easily performs resistance welding, and provides high welding strength. An object of the present invention is to provide an aluminum alloy material for projection welding nuts.
【０００４】[0004]
【課題を解決するための手段】本発明者は上記課題に鑑
み鋭意検討した結果、特定組成のＡｌ−Ｍｇ系合金材が
上記目的に適合することを見出し、この知見に基づき本
発明をなすに至った。すなわち本発明は、（１）Ｍｇ
１．５〜５．０ｗｔ％及びＺｒ ０．３ｗｔ％以下を含
み、残部がアルミニウム及び不可避不純物からなること
を特徴とするプロジェクション溶接ナット用アルミニウ
ム合金材、（２）Ｍｇ １．５〜５．０ｗｔ％及びＮｉ
１．０〜２．０ｗｔ％を含み、残部がアルミニウム及
び不可避不純物からなることを特徴とするプロジェクシ
ョン溶接ナット用アルミニウム合金材、及び（３）Ｍｇ
１．５〜５．０ｗｔ％、Ｚｒ ０．３ｗｔ％以下、及
びＮｉ １．０〜２．０ｗｔ％を含み、残部がアルミニ
ウム及び不可避不純物からなることを特徴とするプロジ
ェクション溶接ナット用アルミニウム合金材を提供する
ものである。The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, have found that an Al-Mg-based alloy material having a specific composition is suitable for the above-mentioned objects. Reached. That is, the present invention relates to (1) Mg
An aluminum alloy material for a projection welding nut, comprising 1.5 to 5.0 wt% and Zr 0.3 wt% or less, with the balance being aluminum and unavoidable impurities, (2) Mg 1.5 to 5.0 wt% % And Ni
An aluminum alloy material for a projection welding nut, comprising 1.0 to 2.0 wt%, with the balance being aluminum and unavoidable impurities; and (3) Mg
An aluminum alloy material for a projection welding nut, comprising 1.5 to 5.0 wt%, Zr 0.3 wt% or less, and Ni 1.0 to 2.0 wt%, with the balance being aluminum and unavoidable impurities. To provide.
【０００５】[0005]
【発明の実施の形態】本発明のプロジェクション溶接ナ
ット用アルミニウム合金材（以下、アルミニウム合金材
という）はＭｇを１．５〜５．０ｗｔ％、好ましくは
２．０〜４．５ｗｔ％含有する。本発明のアルミニウム
合金材においてＭｇは溶接強度を向上させるが、１．５
ｗｔ％未満ではこの効果が十分に得られない。また、
５．０ｗｔ％を越えるとアルミニウム合金材の押出性が
大きく低下し、また、粒界腐食、応力腐食を発生するお
それが生ずる。BEST MODE FOR CARRYING OUT THE INVENTION The aluminum alloy material for projection welding nuts of the present invention (hereinafter referred to as aluminum alloy material) contains 1.5 to 5.0 wt%, preferably 2.0 to 4.5 wt% of Mg. In the aluminum alloy material of the present invention, Mg improves welding strength, but 1.5%.
If it is less than wt%, this effect cannot be sufficiently obtained. Also,
If it exceeds 5.0 wt%, the extrudability of the aluminum alloy material is greatly reduced, and there is a possibility that intergranular corrosion and stress corrosion may occur.
【０００６】本発明のアルミニウム合金材はＭｇととも
にＺｒ及び／又はＮｉを含有する。本発明においてＺｒ
は、アルミニウム合金材の結晶を微細化し、耐熱性を向
上させる。従って、Ｚｒを含むことによって溶接時の発
熱による材料の軟化が防止され、溶接強度が向上する。
Ｚｒが０．３ｗｔ％を越えると巨大な晶出物が生成して
押出性を低下させ、強度、靭性及び加工性も低下するた
め、Ｚｒは０．３ｗｔ％以下、好ましくは０．０５〜
０．２ｗｔ％とする。Ｎｉはアルミニウム合金材の耐熱
性を向上させ、従ってＺｒと同様に溶接時の発熱による
材料の軟化を防止し、溶接強度を向上させる。Ｎｉが
１．０ｗｔ％未満ではこの効果が十分に得られない。ま
た、２．０ｗｔ％を越えると巨大な晶出物が生成して強
度、靭性及び加工性が低下する。このため、Ｎｉは１．
０〜２．０ｗｔ％、好ましくは１．２〜１．８ｗｔ％と
する。[0006] The aluminum alloy material of the present invention contains Zr and / or Ni together with Mg. In the present invention, Zr
Reduces the crystal size of the aluminum alloy material and improves heat resistance. Therefore, by including Zr, softening of the material due to heat generation during welding is prevented, and welding strength is improved.
If Zr exceeds 0.3% by weight, a large crystallized substance is formed and the extrudability is reduced, and the strength, toughness and workability are also reduced. Therefore, Zr is 0.3% by weight or less, preferably 0.05 to 0.05%.
0.2 wt%. Ni improves the heat resistance of the aluminum alloy material, and thus, like Zr, prevents the material from softening due to heat generated during welding and improves welding strength. If the Ni content is less than 1.0 wt%, this effect cannot be sufficiently obtained. On the other hand, if the content exceeds 2.0% by weight, a huge crystallized substance is formed, and the strength, toughness and workability are reduced. Therefore, Ni is 1.
0 to 2.0 wt%, preferably 1.2 to 1.8 wt%.
【０００７】本発明のアルミニウム合金材において、上
記したＭｇ並びにＺｒ及び／又はＮｉの残部はアルミニ
ウム及び不可避不純物である。不可避不純物はＡｌ、Ｍ
ｇ、Ｚｒ及びＮｉ以外の成分であり、例えばＦｅ、Ｓ
ｉ、Ｃｕ、Ｍｎであり、含有量はアルミニウム合金材の
目的とする性質を損なわない範囲であり、通常、Ｆｅは
０．５ｗｔ％以下、Ｓｉは０．３ｗｔ％以下、Ｃｕは
０．２ｗｔ％以下、Ｍｎは０．２ｗｔ％以下である。In the aluminum alloy material of the present invention, the balance of Mg and Zr and / or Ni is aluminum and unavoidable impurities. Inevitable impurities are Al and M
Components other than g, Zr and Ni, such as Fe, S
i, Cu, and Mn, and the content is within a range that does not impair the intended properties of the aluminum alloy material. Usually, Fe is 0.5 wt% or less, Si is 0.3 wt% or less, and Cu is 0.2 wt%. Hereinafter, Mn is 0.2 wt% or less.
【０００８】本発明のアルミニウム合金材の製造は、ア
ルミニウム地金に、上記した組成となる量のＭｇ並びに
Ｚｒ及び／又はＮｉを添加し、これを合金溶湯として、
ビレットに鋳造するなどの方法で行うことができる。本
発明のアルミニウム合金材のプロジェクション溶接用ナ
ットへの成形は、ビレットからの押出加工など、通常行
われる方法で行うことができる。このナットの形状、大
きさ等は特に制限はなく、突起（プロジェクション）を
有し、抵抗溶接されるナットであれば用いることができ
る。図１に本発明のアルミニウム合金材を用いて成形し
たプロジェクション溶接用ナットの一例を、正面図と下
部を切欠断面図とした側面図で示した。図中、１はナッ
ト本体、２はプロジェクション、３はプロジェクション
溶接用ナットを示す。[0008] In the production of the aluminum alloy material of the present invention, Mg and Zr and / or Ni are added to an aluminum base in such an amount that the above composition is obtained.
It can be performed by a method such as casting into a billet. The aluminum alloy material of the present invention can be formed into a projection welding nut by a commonly used method such as extrusion from a billet. The shape, size and the like of the nut are not particularly limited, and any nut having a projection (projection) and resistance welding can be used. FIG. 1 shows an example of a projection welding nut formed by using the aluminum alloy material of the present invention in a front view and a side view in which a lower portion is a cutaway sectional view. In the figure, 1 indicates a nut main body, 2 indicates a projection, and 3 indicates a projection welding nut.
【０００９】本発明のアルミニウム合金材を使用したナ
ットを溶接する母材は、種々のアルミニウム合金板をは
じめとして特に制限はない。またナットと母材の溶接の
方法も、通常の抵抗スポット溶接、プロジェクション溶
接であれば特に制限はなく、例えば特開平６−１２３３
０７号に記載の溶接方法などで溶接することができる。The base material for welding a nut using the aluminum alloy material of the present invention is not particularly limited, including various aluminum alloy plates. The method of welding the nut and the base metal is not particularly limited as long as it is a normal resistance spot welding or projection welding.
No. 07 can be used for welding.
【００１０】[0010]
【実施例】次に、本発明を実施例に基づいてさらに詳細
に説明する。 実施例１〜１５ 表１に示した純度のアルミニウム地金（Ｓｉ、Ｆｅ、Ｃ
ｕ及びＭｎは不可避不純物）にＭｇとＺｒ及び／又はＮ
ｉを表１に示した量添加した合金溶湯を半連続鋳造法に
よりビレットに鋳造し、このビレットを押出加工等によ
って加工してナット（六角溶接ナット−パイロット付
き：ネジの呼び名Ｍ６；ＪＡＳ０ Ｆ１１７７−７７に
基づく）Ｎo.１〜１５を得た。Next, the present invention will be described in more detail with reference to examples. Examples 1 to 15 Aluminum ingots having the purity shown in Table 1 (Si, Fe, C
u and Mn are unavoidable impurities) and Mg and Zr and / or N
The alloy melt to which i was added in the amount shown in Table 1 was cast into a billet by a semi-continuous casting method. No. 1 to 15) (based on No. 77).
【００１１】比較例１〜１６ 実施例１〜１５と同様にして表２に示した組成Ｎo.１６
〜３１の合金溶湯をビレットに鋳造し、このビレットを
実施例１〜１５と同様にナットに加工した。ただし、Ｎ
o.１７、２１、２３、２７、３０及び３１についてはビ
レット作製後の押出加工が行えず、ナットに成形できな
かった。Comparative Examples 1 to 16 In the same manner as in Examples 1 to 15, the composition No. 16 shown in Table 2 was used.
The alloy melts Nos. 1 to 31 were cast into billets, and the billets were processed into nuts as in Examples 1 to 15. Where N
As for o, 17, 21, 23, 27, 30, and 31, extrusion processing after billet production could not be performed and molding into nuts was not possible.
【００１２】[0012]
【表１】 [Table 1]
【００１３】[0013]
【表２】 [Table 2]
【００１４】試験例 実施例及び比較例で得られた各ナットを母材（２ｍｍ×
５０ｍｍ×５０ｍｍ、穴径φ９．５ｍｍ）に溶接し、溶
接性を試験した。母材にはＪＩＳ−Ａ５０５２Ｐ−Ｈ３
４（組成は表３に示した。Ｍｇ ２．５ｗｔ％、Ｃｒ
０．２５ｗｔ％のものを使用）を用いた。溶接機は単相
整流式抵抗溶接機、電極はクロム銅φ１９ｍｍ、一体型
のフラット形を用いた。溶接電流は３２ｋＡ、３６ｋＡ
及び４０ｋＡ、加圧力は５８８４Ｎ、通電時間を６ｃｙ
ｃｌｅとして、実施例及び比較例のナットそれぞれにつ
いて溶接数６個で溶接を行い、溶接性を評価した。比較
として、ＪＩＳ Ａ６０６１−Ｔ６材（組成は表３に示
した。）で作製した同形状のナットについても同じ試験
を行った。Test Example Each nut obtained in Examples and Comparative Examples was used as a base material (2 mm ×
(50 mm × 50 mm, hole diameter φ9.5 mm), and the weldability was tested. The base material is JIS-A5052P-H3
4 (The composition is shown in Table 3. Mg 2.5 wt%, Cr
0.25 wt%). The welding machine used was a single-phase rectifying resistance welding machine, and the electrodes used were a chrome copper φ19 mm, integrated flat type. The welding current is 32kA, 36kA
And 40 kA, the pressure is 5883 N, and the energizing time is 6 cy.
As cle, welding was performed with six pieces of each of the nuts of Examples and Comparative Examples, and the weldability was evaluated. As a comparison, the same test was performed on nuts of the same shape made of JIS A6061-T6 material (the composition is shown in Table 3).
【００１５】[0015]
【表３】 [Table 3]
【００１６】溶接性の評価は、トルク剥離試験（ＪＡＳ
０ Ｆ１１７７−７７に基づく）により行った。図２に
示すようにして、トルクレンチ４を用い、溶接したナッ
ト３が母材５より剥離する強度を求めた。結果を表４及
び表５に示した。表４及び表５よりわかるように、実施
例で得られた各ナットは、３２〜４０ｋＡのいずれの溶
接電流においても比較例のナット及びＪＩＳ Ａ６０６
１−Ｔ６材製のナットに比べトルク剥離強度が高く、良
好な溶接強度が得られている。The weldability was evaluated by a torque peel test (JAS
0 F1177-77). As shown in FIG. 2, the strength at which the welded nut 3 was separated from the base material 5 was determined using a torque wrench 4. The results are shown in Tables 4 and 5. As can be seen from Tables 4 and 5, each of the nuts obtained in the examples was the same as the nut of the comparative example and JIS A606 at any welding current of 32 to 40 kA.
The torque peel strength is higher than that of the nut made of 1-T6 material, and good welding strength is obtained.
【００１７】[0017]
【表４】 [Table 4]
【００１８】[0018]
【表５】 [Table 5]
【００１９】[0019]
【発明の効果】本発明のプロジェクション溶接ナット用
アルミニウム合金材は、ナットに成形するのに好適な押
出性、強度、靭性及び加工性を有し、かつ、溶接性に優
れる。したがって、本発明のアルミニウム合金材を用い
たプロジェクション溶接用ナットは抵抗溶接を行いやす
く、溶接電流を特に高くしなくとも高い溶接強度で母材
と溶接することができる。The aluminum alloy material for projection welding nuts of the present invention has extrudability, strength, toughness and workability suitable for molding into nuts, and is excellent in weldability. Therefore, the projection welding nut using the aluminum alloy material of the present invention can easily perform resistance welding, and can be welded to the base metal with high welding strength without particularly increasing the welding current.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明のアルミニウム合金材を用いたプロジェ
クション溶接用ナットの一例を示す正面図及び下部を切
欠断面図とした側面図である。FIG. 1 is a front view showing an example of a projection welding nut using an aluminum alloy material of the present invention, and a side view in which a lower portion is a cutaway sectional view.
【図２】トルク剥離試験方法を示す説明図である。FIG. 2 is an explanatory view showing a torque peel test method.
１ ナット本体 ２ プロジェクション ３ ナット 1 Nut body 2 Projection 3 Nut
Claims (3)
０．３ｗｔ％以下を含み、残部がアルミニウム及び不可
避不純物からなることを特徴とするプロジェクション溶
接ナット用アルミニウム合金材。1. Mg 1.5-5.0 wt% and Zr
An aluminum alloy material for projection welding nuts, containing 0.3 wt% or less, with the balance being aluminum and unavoidable impurities.
１．０〜２．０ｗｔ％を含み、残部がアルミニウム及び
不可避不純物からなることを特徴とするプロジェクショ
ン溶接ナット用アルミニウム合金材。2. 1.5 to 5.0 wt% of Mg and Ni
An aluminum alloy material for projection welding nuts, comprising 1.0 to 2.0 wt%, with the balance being aluminum and unavoidable impurities.
０．３ｗｔ％以下、及びＮｉ １．０〜２．０ｗｔ％を
含み、残部がアルミニウム及び不可避不純物からなるこ
とを特徴とするプロジェクション溶接ナット用アルミニ
ウム合金材。3. Mg 1.5-5.0 wt%, Zr
An aluminum alloy material for a projection welding nut, comprising 0.3 wt% or less, and 1.0 to 2.0 wt% of Ni, with the balance being aluminum and unavoidable impurities.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14129698A JP3830659B2 (en) | 1998-05-22 | 1998-05-22 | Aluminum alloy material for projection weld nuts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14129698A JP3830659B2 (en) | 1998-05-22 | 1998-05-22 | Aluminum alloy material for projection weld nuts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11335768A true JPH11335768A (en) | 1999-12-07 |
| JP3830659B2 JP3830659B2 (en) | 2006-10-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14129698A Expired - Fee Related JP3830659B2 (en) | 1998-05-22 | 1998-05-22 | Aluminum alloy material for projection weld nuts |
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| Country | Link |
|---|---|
| JP (1) | JP3830659B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233268A (en) * | 2004-02-18 | 2005-09-02 | Toyota Motor Corp | Projection welding nut made of aluminum alloy |
| CN113751967A (en) * | 2021-09-01 | 2021-12-07 | 瑞安市威孚标准件有限公司 | Forming method of welded nut |
-
1998
- 1998-05-22 JP JP14129698A patent/JP3830659B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005233268A (en) * | 2004-02-18 | 2005-09-02 | Toyota Motor Corp | Projection welding nut made of aluminum alloy |
| CN113751967A (en) * | 2021-09-01 | 2021-12-07 | 瑞安市威孚标准件有限公司 | Forming method of welded nut |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3830659B2 (en) | 2006-10-04 |
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