JP4744987B2 - Friction stir welding method - Google Patents
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- JP4744987B2 JP4744987B2 JP2005253901A JP2005253901A JP4744987B2 JP 4744987 B2 JP4744987 B2 JP 4744987B2 JP 2005253901 A JP2005253901 A JP 2005253901A JP 2005253901 A JP2005253901 A JP 2005253901A JP 4744987 B2 JP4744987 B2 JP 4744987B2
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本発明は、摩擦攪拌接合方法に関するものである。 The present invention relates to a friction stir welding method.
金属材の接合方法には種々の方法がある。その一種として、摩擦攪拌接合(FSW=Friction Stir Welding)が、知られている。摩擦攪拌接合は、接合しようとする二つの金属材それぞれの端部を突き合わせ、回転ツールの先端に設けられたピンを両者の端部の間に挿入し、これら端部の長手方向に沿って回転ツールを回転させつつ移動させることによって、二つの金属部材を接合する方法である。
ところで、接合後の接合部位の強度をより向上させることが可能な摩擦攪拌接合方法が要請されている。 Incidentally, there is a demand for a friction stir welding method that can further improve the strength of the joined portion after joining.
そこで、本発明は、接合後の接合部位の強度をより向上させることが可能な摩擦攪拌接合方法を提供することを目的としている。 Then, this invention aims at providing the friction stir welding method which can improve the intensity | strength of the joining site | part after joining more.
本発明の摩擦攪拌接合方法は、冷間加工を施して調質したオーステナイト系ステンレス鋼である二つの金属材を400℃以上550℃以下の所定温度に加熱する工程と、この工程によって加熱された金属材の端部を突き合わせて、該端部間に回転ツールのピンを挿入し該ピンを回転させつつ該端部に沿って移動させることにより摩擦攪拌接合を行う工程と、を含む。このオーステナイト系ステンレス鋼には、JIS E 4049に規定のSUS301L−HTが含まれる。また、摩擦攪拌接合は、スポットFSWを含むものである。 The friction stir welding method of the present invention is a process of heating two metal materials, which are austenitic stainless steel tempered by cold working, to a predetermined temperature of 400 ° C. or more and 550 ° C. or less, and is heated by this step. A step of performing friction stir welding by abutting the ends of the metal material, inserting a pin of a rotating tool between the ends, and moving the pin along the end while rotating the pin . This austenitic stainless steel includes SUS301L-HT defined in JIS E 4049. Further, the friction stir welding includes a spot FSW.
本発明によれば、接合後の接合部位の強度をより向上させることが可能な摩擦攪拌接合方法が提供される。 ADVANTAGE OF THE INVENTION According to this invention, the friction stir welding method which can improve the intensity | strength of the joining site | part after joining is provided.
以下、図面を参照して本発明の好適な実施形態について詳細に説明する。なお、各図面において同一又は相当の部分に対しては同一の符号を附すこととする。 DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.
図1は、実施の形態に係る摩擦攪拌接合方法の工程図である。図1に示すように、本実施の形態の摩擦攪拌接合方法では、まず、冷間加工を施して調質したオーステナイト系ステンレス鋼である二つの金属を所定温度に加熱する工程が、実施される(ステップS01)。 FIG. 1 is a process diagram of a friction stir welding method according to an embodiment. As shown in FIG. 1, in the friction stir welding method of the present embodiment, first, a step of heating two metals, which are austenitic stainless steel tempered by cold working, to a predetermined temperature is performed. (Step S01).
なお、所定温度とは、400℃以上550℃以下の温度である。また、加熱とは、所定温度に至るまで、金属材が十分な時間加熱されていること意味する。このように、所定温度に金属材を加熱すると、転位が減少し、且つ、結晶粒の粒径が適切な値に制御され、後述の摩擦攪拌接合後の接合部位の強度が向上されるものと考えられる。 The predetermined temperature is a temperature of 400 ° C. or higher and 550 ° C. or lower. Further, the heating means that the metal material is heated for a sufficient time until reaching a predetermined temperature. Thus, when the metal material is heated to a predetermined temperature, the dislocation is reduced, the grain size of the crystal grains is controlled to an appropriate value, and the strength of the bonded portion after the friction stir welding described later is improved. Conceivable.
次に、本実施の形態の摩擦攪拌接合方法では、ステップS01において加熱された二つの金属材が摩擦攪拌接合される(ステップS02)。図2は、摩擦攪拌接合を説明するための図である。図2において(a)には、摩擦攪拌接合の様子が示されており、(b)には、摩擦攪拌接合に用いられる回転ツールの側面図が示されている。 Next, in the friction stir welding method of the present embodiment, the two metal materials heated in step S01 are friction stir welded (step S02). FIG. 2 is a view for explaining friction stir welding. In FIG. 2, (a) shows a state of friction stir welding, and (b) shows a side view of a rotary tool used for friction stir welding.
摩擦攪拌接合は、図2における(a)に示すように、金属材1a及び金属材1bそれぞれの端部をつきあせて、棒状の回転ツール10の先端に設けられたピン11を端部間に挿入し、ピン11を回転させつつ端部に沿って移動させる方法である。
In the friction stir welding, as shown in FIG. 2 (a), the ends of the
図2における(b)に示すように、回転ツール10は、略円柱状のショルダー12とその先端にあり金属材の端部間に挿入されるピン11から構成されている。ピン11は、ショルダー12より小径の略円柱形をなしている。
As shown in FIG. 2B, the
このように、ステップS02において、摩擦攪拌接合が実施されることによって、本実施の形態の摩擦攪拌接合方法が、完了する。 Thus, in step S02, the friction stir welding method according to the present embodiment is completed by performing the friction stir welding.
以下、本実施の形態に従って行った実験例について説明する。 Hereinafter, experimental examples performed in accordance with the present embodiment will be described.
この実験例において作成したサンプルNo.1〜No.12の金属材、及び摩擦攪拌接合方法における各条件を表1に示す。
Sample No. created in this experimental example. 1-No. Table 1 shows conditions for the 12 metal materials and the friction stir welding method.
表1に示すように、サンプルNo.1〜No.12の金属材には、冷間加工を施して調質したオーステナイト系ステンレス鋼として、JIS E 4049に規定のSUS301L−HTであって、厚さ1.5mm、幅30mm、長さ300mmのSUS301L−HT材を用いた。この実験例では、サンプルNo.1〜No.12の金属材を、表1に示す温度で、30分間加熱した(ステップS01)。なお、加熱は、シリコユニット炉で大気雰囲気中で行った。 As shown in Table 1, sample no. 1-No. 12 is a SUS301L-HT specified in JIS E 4049 as an austenitic stainless steel tempered by cold working, and has a thickness of 1.5 mm, a width of 30 mm, and a length of 300 mm. HT material was used. In this experimental example, sample no. 1-No. Twelve metal materials were heated at the temperature shown in Table 1 for 30 minutes (step S01). The heating was performed in an air atmosphere in a silicon unit furnace.
そして、加熱後の各サンプル材を用いて、表1に示すとおりの条件で、摩擦攪拌接合(ステップS02)を行った。摩擦攪拌接合には、窒化珪素(Si3N4)製であり、ショルダー径12mm、ピン径4mm、ピン長1.4mmの回転ツールを用いた。 Then, friction stir welding (step S02) was performed under the conditions shown in Table 1 using each sample material after heating. For the friction stir welding, a rotating tool made of silicon nitride (Si 3 N 4 ) and having a shoulder diameter of 12 mm, a pin diameter of 4 mm, and a pin length of 1.4 mm was used.
次に、摩擦攪拌接合後の部材から試験片を作成して、引張試験を行った。引張試験においては、図3に示すように、攪拌部Sにおける接合部位Jが中心を横切る試験片を用いた。この試験片の各パラメータは、L1:60mm、W1:16mm、L2:10mm、L3:7.5mm、L4:25mm、W2=12mm、R=15mmである。かかる試験片に対して、INSTRON社製の引張試験機を用いて、室温にて引張速度1mm/minの引張試験を行った。 Next, a test piece was prepared from the member after friction stir welding, and a tensile test was performed. In the tensile test, as shown in FIG. 3, a test piece in which the joint portion J in the stirring portion S crosses the center was used. Each parameter of this test piece is L1: 60mm, W1: 16mm, L2: 10mm, L3: 7.5mm, L4: 25mm, W2 = 12mm, R = 15mm. The test piece was subjected to a tensile test at a tensile speed of 1 mm / min at room temperature using a tensile tester manufactured by INSTRON.
図4は、実験例2にかかる金属材の加熱温度と引張強度の関係を示すグラフである。図4には、サンプルNo.1〜No.12の金属材の加熱温度と引張強度の関係が示されている。図4に示すように、SUS301L−HTの金属材は、400℃以上550℃以下の所定温度に加熱されることによって、加熱を行わない場合或いは加熱温度が高すぎる場合に比して、その接合部位の強度が向上されることが確認された。 FIG. 4 is a graph showing the relationship between the heating temperature and the tensile strength of the metal material according to Experimental Example 2. In FIG. 1-No. The relationship between the heating temperature of 12 metal materials and tensile strength is shown. As shown in FIG. 4, the metal material of SUS301L-HT is heated to a predetermined temperature of 400 ° C. or more and 550 ° C. or less, so that the bonding is not performed when heating is not performed or when the heating temperature is too high. It was confirmed that the strength of the part was improved.
1a,1b…金属材、10…回転ツール、11…ピン、12…ショルダー。
1a, 1b ... metal material, 10 ... rotating tool, 11 ... pin, 12 ... shoulder.
Claims (1)
前記工程によって加熱された前記金属材の端部を突き合わせて、該端部間に回転ツールのピンを挿入し該ピンを回転させつつ該端部に沿って移動させることにより摩擦攪拌接合を行う工程と、
を含む摩擦攪拌接合方法。 Heating two metallic materials that are austenitic stainless steel tempered by cold working to a predetermined temperature of 400 ° C. or higher and 550 ° C. or lower;
A process of performing friction stir welding by abutting the end portions of the metal material heated in the step, inserting a pin of a rotating tool between the end portions, and moving the pin along the end portion while rotating the pin. When,
A friction stir welding method including:
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