JP3017378B2 - Sintered welded joint structural member - Google Patents
Sintered welded joint structural memberInfo
- Publication number
- JP3017378B2 JP3017378B2 JP5160215A JP16021593A JP3017378B2 JP 3017378 B2 JP3017378 B2 JP 3017378B2 JP 5160215 A JP5160215 A JP 5160215A JP 16021593 A JP16021593 A JP 16021593A JP 3017378 B2 JP3017378 B2 JP 3017378B2
- Authority
- JP
- Japan
- Prior art keywords
- iron
- based sintered
- hardness
- sintered material
- steel
- 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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Description
【０００１】[0001]
【産業上の利用分野】本発明は主に自動車の動力伝達系
等に用いられる鉄系焼結材の溶接継手部を持った構造部
材に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structural member having a weld joint made of an iron-based sintered material mainly used for a power transmission system of an automobile and the like.
【０００２】[0002]
【従来の技術及び発明が解決しようとする課題】鉄系焼
結材の溶接は、鉄系焼結材同士を溶接し、或いは一方が
鉄系焼結材で他方が鋼材等の他材料として溶接する場合
がある。しかし、鉄系焼結材は多孔質であるため、一般
のアーク溶接などで溶接すると、母材の空孔が集合し、
大きなブローホールが溶接金属に形成され、溶接部の強
度が確保できなくなると共に割れが発生する。BACKGROUND OF THE INVENTION In the welding of iron-based sintered materials, iron-based sintered materials are welded to each other, or one is iron-based sintered material and the other is welded as another material such as steel. May be. However, since iron-based sintered materials are porous, if they are welded by general arc welding, etc., holes in the base material will aggregate,
A large blow hole is formed in the weld metal, so that the strength of the weld cannot be ensured and cracks occur.
【０００３】このため、特開平４−２８４９８９号に代
表される如く、特定の成分の溶加材を供給しながら、レ
ーザ溶接する方法が提案されている。しかしながら、溶
接継手部の引張特性において、必ずしも母材と同等の強
度が得られないケースがあり、母材並の強度が必要な重
要部材への適用が難しい状況である。[0003] For this reason, a method of laser welding while supplying a filler metal of a specific component has been proposed, as typified by Japanese Patent Application Laid-Open No. 4-284899. However, in some cases, the same tensile strength as that of the base material is not always obtained in the tensile properties of the welded joint, and it is difficult to apply it to important members that require the same strength as the base material.
【０００４】本発明は、上記従来技術の問題点を解決
し、鉄系焼結材の溶接において、母材並の強度の溶接継
手が得られる技術を提供することを目的とするものであ
る。[0004] It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a technique for welding a ferrous sintered material to obtain a welded joint having a strength equivalent to that of a base metal.
【０００５】[0005]
【課題を解決するための手段】本発明者は、前記課題を
解決するために鋭意研究を重ねた結果、対象とする材料
組合せの溶接継手の引張特性において、焼結材同士であ
れば、強度の低い側の焼結母材と同等の引張強度が得ら
れ、焼結材と他材料の組合せの場合は、強度の低い側の
材料と同等の引張強度が得られる継手構造を持った構造
部材を見い出し、ここに本発明をなしたものである。Means for Solving the Problems The present inventor has conducted intensive studies in order to solve the above-mentioned problems, and as a result, as for the tensile properties of the welded joint of the target material combination, if the sintered materials are mutually sintered, the strength will be higher. Structural member with a joint structure that can obtain the same tensile strength as the sintered base material on the lower side and, in the case of a combination of sintered material and other materials, the same tensile strength as the material on the lower side The present invention has been made here.
【０００６】すなわち、本発明は、鉄系焼結材同士、鉄
系焼結材と鋼材、鋳鋼、鋳鉄または中高炭素鋼との溶接
継手を持った構造部材において、溶接金属の平均硬さが
ビッカース硬さＨｖ（以下、Ｈｖで示されるビッカース
硬さは、全て測定荷重５００ｇ以下で測定した値を意味
する）で１００〜３５０の範囲であって、かつ、鉄系焼
結材側の溶接熱影響部の最高硬さＨｖが１００〜４５０
の範囲であることを特徴とする焼結材溶接継手構造部材
を要旨としている。That is, according to the present invention, the average hardness of a weld metal is Vickers in a structural member having a welded joint between iron-based sintered materials, iron-based sintered material and steel, cast steel, cast iron or medium-high carbon steel. Hardness Hv (hereinafter, Vickers hardness indicated by Hv means a value measured under a measurement load of 500 g or less) in the range of 100 to 350 and the effect of welding heat on the iron-based sintered material side The maximum hardness Hv of the part is 100 to 450
The gist is a sintered material welded joint structural member characterized by the following range.
【０００７】また、他の本発明は、鉄系焼結材同士、鉄
系焼結材と鋼材、鋳鋼、鋳鉄又は中高炭素鋼との溶接継
手部を持った構造部材において、鉄系焼結材側の溶接熱
影響部の最高硬さＨvが４５０を超え６００以下の範囲
であって、かつ、溶接金属の平均硬さＨvが１００〜３
５０の範囲であることを特徴とする焼結材溶接継手構造
部材を要旨としている。Another object of the present invention is to provide a structural member having a weld joint between iron-based sintered materials, an iron-based sintered material and a steel material, cast steel, cast iron or medium-high carbon steel. The maximum hardness Hv of the welding heat affected zone on the side is in the range of more than 450 to 600 or less, and the average hardness Hv of the weld metal is 100 to 3
The gist is a sintered material welded joint structural member having a range of 50.
【０００８】更に、他の本発明は、鉄系焼結材同士、鉄
系焼結材と鋼材、鋳鋼、鋳鉄又は中高炭素鋼との溶接継
手部を持った構造部材において、溶接金属の平均硬さＨ
vが３５０を超え５００以下の範囲であって、かつ、鉄
系焼結材側の溶接熱影響部の最高硬さＨvが１００〜４
５０の範囲であることを特徴とする焼結材溶接継手構造
部材を要旨としている。Further, the present invention also relates to a structural member having a weld joint between iron-based sintered materials, between an iron-based sintered material and steel, cast steel, cast iron or medium-high carbon steel. H
v is in the range of more than 350 to 500 or less, and the maximum hardness Hv of the welding heat affected zone on the iron-based sintered material side is 100 to 4
The gist is a sintered material welded joint structural member having a range of 50.
【０００９】以下に本発明を更に詳細に説明する。Hereinafter, the present invention will be described in more detail.
【作用】[Action]
【００１０】本発明が対象とする溶接継手は、少なくと
も片方が鉄系焼結材で構成されている。鉄系焼結材に
は、通常ポアと呼ばれている空洞が存在している。一
方、鉄系焼結材はその強度を確保するためにＣが０.３
％程度以上添加されている。したがって、これを溶接す
ると、溶接金属は勿論のこと、溶接熱影響部も硬化する
傾向がある。溶接金属については適当な溶加材を添加す
ることにより、硬さを低減することが可能であるが、溶
接熱影響部については何らかの熱処理を行うか、或いは
硬化が低減される条件で溶接する必要がある。[0010] At least one of the welded joints targeted by the present invention is made of an iron-based sintered material. The iron-based sintered material has a cavity usually called a pore. On the other hand, the iron-based sintered material has a C of 0.3 to secure its strength.
% Or more. Therefore, when this is welded, the weld heat affected zone as well as the weld metal tends to harden. It is possible to reduce the hardness of the weld metal by adding an appropriate filler, but it is necessary to perform some kind of heat treatment on the heat affected zone or weld under conditions that reduce hardening. There is.
【０００９】硬度が高く、かつ空洞が存在する鉄系焼結
材は、いわゆる切欠強度が極めて低いため、少なくとも
片方が鉄系焼結材で構成されている溶接継手(溶接金属
に欠陥がない場合)の引張試験を行うと、鉄系焼結材母
材の強度に比べて、かなり低い強度で焼結材側の溶接熱
影響部で破断する。[0009] Since the so-called notched strength of an iron-based sintered material having a high hardness and having cavities is extremely low, a welded joint having at least one of the iron-based sintered materials (when there is no defect in the weld metal). When the tensile test is performed, the fracture occurs in the weld heat affected zone on the sintered material side at a considerably lower strength than the strength of the iron-based sintered material base material.
【００１０】但し、この傾向は、単に溶接熱影響部の硬
さのみで決定されるものでなく、ある硬さ以上の範囲で
は、溶接熱影響部の硬さと溶接金属の硬さのバランスが
関係することが判明した。[0010] However, this tendency is not determined solely by the hardness of the weld heat affected zone, but in a range above a certain hardness, the balance between the hardness of the weld heat affected zone and the hardness of the weld metal is related. It turned out to be.
【００１１】すなわち、具体的には、図１に示すよう
に、溶接金属の硬さＨvが１００〜３５０の範囲で、
かつ、鉄系焼結材側の溶接熱影響部の最高硬さＨvが１
００〜４５０の範囲であること、鉄系焼結材側の溶接
熱影響部の最高硬さＨvが４５０を超え６００以下の範
囲であって、かつ、溶接金属の平均硬さＨvが１００〜
３５０の範囲であること、溶接金属の平均硬さＨvが
３５０を超え５００以下の範囲であって、かつ、鉄系焼
結材側の溶接熱影響部の最高硬さＨvが１００〜４５０
の範囲であること、というバランスが必要である。More specifically, as shown in FIG. 1, when the hardness Hv of the weld metal is in the range of 100 to 350,
In addition, the maximum hardness Hv of the welding heat affected zone on the iron-based sintered material side is 1
100 to 450, the maximum hardness Hv of the welding heat affected zone on the iron-based sintered material side is more than 450 and 600 or less, and the average hardness Hv of the weld metal is 100 to 450.
350, the average hardness Hv of the weld metal is in the range of more than 350 to 500 or less, and the maximum hardness Hv of the welding heat affected zone on the iron-based sintered material side is 100 to 450.
It is necessary to have the balance that
【００１２】このようなバランスは、要するに、溶接継
手全体としては、溶接熱影響部、溶接金属部ともに或る
硬さ以下である場合(上記)には、パランスが良い。し
かし、溶接熱影響部の最高硬さが高い範囲(上記)にお
いては、溶接金属の硬さを低い範囲に抑えることが重要
である。これにより溶接熱影響部における硬化部にかか
る応力が、硬さの低い溶接金属部に吸収され、低強度破
壊が阻止される。一方、溶接金属の硬さが高い範囲(上
記)においては、この溶接金属は応力の吸収能が低い
ため、溶接熱影響部の最高硬さを低いレベルにまで抑え
る必要がある。In short, such a balance is good when the weld heat affected zone and the weld metal portion of the welded joint as a whole have a certain hardness or less (as described above). However, in the range where the maximum hardness of the weld heat affected zone is high (described above), it is important to suppress the hardness of the weld metal to a low range. Thereby, the stress applied to the hardened portion in the heat affected zone is absorbed by the weld metal having low hardness, and low strength fracture is prevented. On the other hand, in the range where the hardness of the weld metal is high (as described above), the weld metal has a low ability to absorb stress, so it is necessary to suppress the maximum hardness of the weld heat affected zone to a low level.
【００１３】以上のように、焼結材側の溶接熱影響部と
溶接金属部の硬さバランスの良い継手構造とすることに
より、引張特性として、鉄系焼結材同士の場合は鉄系焼
結材母材並の強度が得られ、鉄系焼結材材と他の材料と
の組合せの場合は強度の低い他の材料側母材と同等の強
度が得られる。As described above, the joint structure having a good balance between the hardness of the weld heat-affected zone on the sintered material side and the hardness of the weld metal portion allows the iron-based sintered material to have a tensile property as a tensile characteristic. The strength equivalent to that of the binder base material is obtained, and in the case of a combination of the iron-based sintered material and another material, the same strength as the other material side base material having low strength is obtained.
【００１４】鋼材を代表とする他の材料側の熱影響部の
硬さに制限されないのは、一般にこのような溶製材には
空洞欠陥(強度に影響する)が存在しないため、一般にい
われているように、切欠が存在しない場合の強度は、硬
さとほぼ比例して強度が上がるため、高硬度＝低引張強
度といった式が成立しないからである。It is generally said that the hardness of the heat-affected zone on the side of another material typified by steel is not limited because such a smelted material generally does not have cavity defects (affecting strength). As described above, the strength in the case where there is no notch increases almost in proportion to the hardness, so that the equation of high hardness = low tensile strength does not hold.
【００１５】なお、溶接継手の硬さを制御する方法とし
て、溶接金属については組織がオーステナイト或いはオ
ーステナイトとの混合組織になるような、溶加材を利用
したり、溶接後熱処理により軟化させたりすることで制
御できる。また、溶接熱影響部については、予熱を施し
て溶接したり、冷却速度の遅い溶接条件を選定して溶接
したり、多重パスの溶接により熱影響部を軟化させた
り、或いは後熱処理により全体の硬さを低下させたりす
ることで制御することができる。As a method for controlling the hardness of the welded joint, a filler metal is used so that the structure of the weld metal becomes austenite or a mixed structure with austenite, or the weld metal is softened by heat treatment after welding. Can be controlled by For the heat affected zone, welding is performed by preheating, welding is performed by selecting welding conditions with a low cooling rate, the heat affected zone is softened by multi-pass welding, or the overall It can be controlled by reducing the hardness.
【００１６】溶接方法の種類としてはレーザ溶接が最も
好ましいが、プラズマアーク溶接等の高エネルギービー
ムを用いた溶接法も可能である。Laser welding is the most preferable type of welding method, but a welding method using a high energy beam such as plasma arc welding is also possible.
【００１７】また、本発明において、他の材料側として
は、鉄系焼結材との異材溶接として利用される鋼材、鋳
鋼、鋳鉄又は中高炭素鋼である。これらは溶製材であ
り、種々の組成のものが可能である。Further, in the present invention, the other material side is steel, cast steel, cast iron or medium-high carbon steel used as dissimilar material welding with an iron-based sintered material. These are ingots, and various compositions are possible.
【００１８】次に本発明の実施例を示す。Next, an embodiment of the present invention will be described.
【００１９】[0019]
【実施例１】本例は焼結材同士の溶接継手の例である。[Embodiment 1] This embodiment is an example of a welded joint between sintered materials.
【００２０】表１に示す鉄系焼結材(サイズ：５mm厚×
(５０＋５０)mm幅×１００mm長さ)に対して、表２の条
件でレーザ溶接を行った後、図２に示す引張試験片を採
取して継手引張試験を行った。溶接に当たり、予熱、後
熱を施したり、溶加材の成分や供給速度を変化させて、
種々の硬さの溶接継手を得た。An iron-based sintered material shown in Table 1 (size: 5 mm thick ×
After (50 + 50) mm width × 100 mm length), laser welding was performed under the conditions shown in Table 2, and a tensile test piece shown in FIG. 2 was taken to conduct a joint tensile test. During welding, preheating and post-heating are performed, and the components and supply speed of the filler metal are changed.
Welded joints of various hardness were obtained.
【００２１】継手引張試験結果及び硬さ測定結果を表３
に示す。引張試験結果の基準判定として、母材強度の９
０％以上の継手効率が得られたものを合格とした。表３
より明らかなように、本発明例は、いずれも、焼結材母
材側で破断している。Table 3 shows the results of the joint tensile test and the hardness measurement.
Shown in As a reference judgment of the tensile test result, 9
Those with a joint efficiency of 0% or more were judged as acceptable. Table 3
As is clear, all of the examples of the present invention are broken on the sintered material base material side.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【表２】 [Table 2]
【００２４】[0024]
【表３】 [Table 3]
【００２５】[0025]
【実施例２】本例は焼結材と鋼材の異材溶接継手の例で
ある。Embodiment 2 This embodiment is an example of a dissimilar material welded joint between a sintered material and a steel material.
【００２６】実施例１で用いた鉄系焼結材と、ＳＭ４９
０Ａ鋼材(サイズは焼結材と同じ)との突き合わせ溶接を
行った上で、継手引張試験を行った。試験要領は実施例
１と同様である。継手引張試験結果及び硬さ測定結果を
表４に示す。表４より明らかなように、本発明例は、い
ずれも、焼結材母材側で破断している。The iron-based sintered material used in Example 1 and SM49
After performing butt welding with a 0A steel material (the size is the same as that of the sintered material), a joint tensile test was performed. The test procedure is the same as in Example 1. Table 4 shows the joint tensile test results and the hardness measurement results. As is clear from Table 4, all of the examples of the present invention are broken on the sintered material base material side.
【００２７】[0027]
【表４】 [Table 4]
【００２８】[0028]
【実施例３】本例は鉄系焼結材と鋳鋼、鋳鉄又は中高炭
素鋼との異材溶接継手の例である。Embodiment 3 This embodiment is an example of a dissimilar material welded joint between an iron-based sintered material and cast steel, cast iron or medium-high carbon steel.
【００２９】実施例１と同様の鉄系焼結材を用い、この
焼結材とＳＣ４８０、焼結材とＦＣＤ５００、焼結材と
Ｓ２５Ｃ又はＳ５０Ｃの組合せ継手について、実施例２
と同様の溶接試験を行った結果、本発明で規定される硬
さバランスを有する場合は、鉄系焼結材母材側で破断
し、鉄系焼結材の母材並強度が得られることが確認され
た。Using the same iron-based sintered material as in Example 1, a combination joint of this sintered material with SC480, a sintered material with FCD500, and a sintered material with S25C or S50C was used.
As a result of performing the same welding test as above, if the steel has the hardness balance defined by the present invention, the steel-based sintered material breaks on the base material side, and the base material equivalent strength of the iron-based sintered material is obtained. Was confirmed.
【００３０】[0030]
【発明の効果】以上詳述したように、本発明によれば、
鉄系焼結材同士、或いは鉄系焼結材と鋼材、鋳鋼、鋳鉄
又は中高炭素鋼との溶接継手部において、強度の低い側
の母材並の強度の溶接継手が得られるので、鉄系焼結部
材の溶接に寄与する効果は大きい。As described in detail above, according to the present invention,
In a welded joint between iron-based sintered materials or between an iron-based sintered material and steel, cast steel, cast iron or medium-high carbon steel, a welded joint having a strength similar to that of the base material on the lower strength side can be obtained. The effect of contributing to welding of the sintered member is great.
【図１】本発明における溶接熱影響部の硬さと溶接金属
の硬さのバランス関係を示す図である。FIG. 1 is a diagram showing a balance relationship between the hardness of a welding heat affected zone and the hardness of a weld metal in the present invention.
【図２】引張試験片を示す図である。FIG. 2 is a view showing a tensile test piece.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 芳野文人 神奈川県藤沢市宮前字裏河内100番１株 式会社神戸製鋼所藤沢事業所内 (56)参考文献 特開 平４−339591（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) B23K 31/00 B23K 26/00 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Fumito Yoshino 100-1 Urakawachi, Miyama-ji, Fujisawa-shi, Kanagawa Prefecture Kobe Steel Fujisawa Works (56) References JP-A-4-339591 (JP, A) (58) Field surveyed (Int. Cl. 7 , DB name) B23K 31/00 B23K 26/00
Claims (3)
鋼、鋳鉄または中高炭素鋼との溶接継手を持った構造部
材において、溶接金属の平均硬さがビッカース硬さＨｖ
（測定荷重５００ｇ以下）で１００〜３５０の範囲であ
って、かつ、鉄系焼結材側の溶接熱影響部の最高硬さＨ
ｖ（測定荷重５００ｇ以下）が１００〜４５０の範囲で
あることを特徴とする焼結材溶接継手構造部材。1. In a structural member having a welded joint between iron-based sintered materials, or between an iron-based sintered material and a steel material, cast steel, cast iron or medium-high carbon steel, the average hardness of the weld metal is Vickers hardness Hv.
(Measured load of 500 g or less) in the range of 100 to 350 and the maximum hardness H of the weld heat affected zone on the iron-based sintered material side.
v (measured load 500 g or less) is in the range of 100 to 450, a sintered material welded joint structural member.
鋼、鋳鉄または中高炭素鋼との溶接継手を持った構造部
材において、溶接金属の平均硬さがビッカース硬さＨｖ
（測定荷重５００ｇ以下）で１００〜３５０の範囲であ
って、かつ、鉄系焼結材側の溶接熱影響部の最高硬さＨ
ｖ（測定荷重５００ｇ以下）が４５０を超え６００以下
の範囲であることを特徴とする焼結材溶接継手構造部
材。2. In a structural member having a welded joint between iron-based sintered materials, or between an iron-based sintered material and a steel material, cast steel, cast iron or medium-high carbon steel, the average hardness of the weld metal is Vickers hardness Hv.
(Measured load of 500 g or less) in the range of 100 to 350 and the maximum hardness H of the weld heat affected zone on the iron-based sintered material side.
v (measured load: 500 g or less) is in the range of more than 450 to 600 or less.
鋼、鋳鉄または中高炭素鋼との溶接継手を持った構造部
材において、溶接金属の平均硬さがビッカース硬さＨｖ
（測定荷重５００ｇ以下）で３５０を超え５００以下の
範囲であって、かつ、鉄系焼結材側の溶接熱影響部の最
高硬さＨｖ（測定荷重５００ｇ以下）が１００〜４５０
の範囲であることを特徴とする焼結材溶接継手構造部
材。3. The average hardness of a weld metal in a structural member having a welded joint between iron-based sintered materials, between an iron-based sintered material and a steel material, cast steel, cast iron, or medium-high carbon steel is Vickers hardness Hv.
(Measurement load of 500 g or less) is more than 350 and 500 or less, and the maximum hardness Hv (measurement load of 500 g or less) of the welding heat affected zone on the iron-based sintered material side is 100 to 450.
A sintered material welded joint structural member characterized by the following range.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5160215A JP3017378B2 (en) | 1993-06-03 | 1993-06-03 | Sintered welded joint structural member |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5160215A JP3017378B2 (en) | 1993-06-03 | 1993-06-03 | Sintered welded joint structural member |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06344174A JPH06344174A (en) | 1994-12-20 |
| JP3017378B2 true JP3017378B2 (en) | 2000-03-06 |
Family
ID=15710228
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5160215A Expired - Fee Related JP3017378B2 (en) | 1993-06-03 | 1993-06-03 | Sintered welded joint structural member |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3017378B2 (en) |
-
1993
- 1993-06-03 JP JP5160215A patent/JP3017378B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06344174A (en) | 1994-12-20 |
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