JPH06344174A - Sintered material weld joint structural member - Google Patents
Sintered material weld joint structural memberInfo
- Publication number
- JPH06344174A JPH06344174A JP5160215A JP16021593A JPH06344174A JP H06344174 A JPH06344174 A JP H06344174A JP 5160215 A JP5160215 A JP 5160215A JP 16021593 A JP16021593 A JP 16021593A JP H06344174 A JPH06344174 A JP H06344174A
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- Prior art keywords
- hardness
- iron
- range
- sintered material
- steel
- Prior art date
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Abstract
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 welded joint of an iron-based sintered material, which is mainly used for power transmission systems of automobiles.
【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。2. Description of the Related Art Welding of iron-based sintered materials is performed by welding iron-based sintered materials to each other, or one of them is an iron-based sintered material and the other is welded as another material such as steel. There is a case. However, since the iron-based sintered material is porous, when it is welded by general arc welding etc., the holes of the base material gather,
Large blowholes are formed in the weld metal, making it impossible to secure the strength of the weld and cracking.
【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。Therefore, as represented by JP-A-4-284989, there has been proposed a method of laser welding while supplying a filler material having specific components. However, in the tensile properties of the welded joint, there are cases where the same strength as that of the base material cannot always be obtained, 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。It is an object of the present invention to solve the above-mentioned problems of the prior art and to provide a technique capable of obtaining a welded joint having the same strength as that of the base metal in the welding of iron-based sintered materials.
【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 As a result of intensive studies to solve the above problems, the present inventor has found that in the tensile properties of the welded joint of the target material combination, if the sintered materials are of the same strength, A structural member with a joint structure that can obtain tensile strength equivalent to that of the sintered base material on the low strength side, and in the case of a combination of the sintered material and other materials, a tensile strength equivalent to that of the material on the low strength side. The present invention was 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が
ビッカース硬さＨv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(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を要旨としている。That is, according to the present invention, in a structural member having a welded joint portion of iron-based sintered materials, iron-based sintered material and steel material, cast steel, cast iron or medium-high carbon steel, the average hardness of the weld metal is The Vickers hardness Hv is in the range of 100 to 350,
Further, the gist is a sintered material welded joint structural member characterized in that the maximum hardness Hv (measuring load of 500 g or less) of the welding heat affected zone on the iron-based sintered material side is in the range of 100 to 450.
【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 aspect of the present invention is a structural member having a welded 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 weld heat-affected zone on the side is in the range of more than 450 and 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。Still another aspect of the present invention is a structural member having a welded joint between iron-based sintered materials, iron-based sintered material and steel material, cast steel, cast iron or medium-high carbon steel, and the average hardness of the weld metal. Sa H
v is in the range of more than 350 and 500 or less, and the maximum hardness Hv of the weld 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。The present invention will be described in more detail below.
【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。At least one of the welded joints of the present invention is made of an iron-based sintered material. The iron-based sintered material has cavities usually called pores. On the other hand, the iron-based sintered material has a C content of 0.3 to secure its strength.
% Or more is added. Therefore, when this is welded, not only the weld metal but also the weld heat affected zone tends to harden. Hardness can be reduced by adding an appropriate filler metal to the weld metal, but it is necessary to perform some heat treatment on the heat-affected zone of the weld or to weld it under the condition that the hardening is reduced. 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。The iron-based sintered material having a high hardness and having voids has a so-called notch strength that is extremely low, so that at least one of the welded joints is made of the iron-based sintered material (when there is no defect in the weld metal). When the tensile test of (1) is performed, the fracture occurs in the weld heat affected zone on the side of the sintered material at a strength considerably lower 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。However, this tendency is not simply determined by the hardness of the welding heat affected zone, but within a certain hardness or more, the balance between the hardness of the welding 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。Specifically, as shown in FIG. 1, when the hardness Hv of the weld metal is in the range of 100 to 350,
Moreover, the maximum hardness Hv of the weld heat affected zone on the iron-based sintered material side is 1
It is in the range of 0 to 450, the maximum hardness Hv of the welding heat affected zone on the side of the iron-based sintered material is in the range of more than 450 and 600 or less, and the average hardness Hv of the weld metal is 100 to
It is in the range of 350, the average hardness Hv of the weld metal is in the range of more than 350 and 500 or less, and the maximum hardness Hv of the welding heat affected zone on the side of the iron-based sintered material is 100 to 450.
It is necessary to have a balance of being within the range.
【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 balance is good when the welded heat-affected zone and the welded metal part 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 (above), it is important to suppress the hardness of the weld metal to a low range. As a result, the stress applied to the hardened portion in the weld heat affected zone is absorbed by the weld metal portion 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 (above), since the weld metal has a low stress absorbing ability, 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, by providing a joint structure in which the hardness of the welded heat affected zone on the sintered material side and the weld metal portion are well balanced, the tensile properties of the iron-based sintered materials are iron-based sintered materials. The same strength as that of the binder base material is obtained, and in the case of the combination of the iron-based sintered material and another material, the same strength as that of 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 represented by a steel material is not limited because voids (which affect the strength) do not exist in such a molten material. As described above, the strength in the absence of the notch increases substantially in proportion to the hardness, and therefore the formula 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 such that the structure of the weld metal is austenite or a mixed structure with austenite, or it is softened by heat treatment after welding. You can control it. Regarding the heat-affected zone of welding, preheating is performed, welding is performed by selecting welding conditions with a slow cooling rate, the heat-affected zone is softened by multi-pass welding, or the entire heat treatment is performed by post heat treatment. It can be controlled by lowering 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 most preferable as the 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 a steel material, cast steel, cast iron or medium-high carbon steel used as a dissimilar material weld with an iron-based sintered material. These are ingots and can have various compositions.
【００１８】次に本発明の実施例を示す。Next, examples 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。Example 1 This example 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。Iron-based sintered materials shown in Table 1 (size: 5 mm thick x
Laser welding was performed under the conditions shown in Table 2 for (50 + 50) mm width × 100 mm length), and then the tensile test piece shown in FIG. 2 was sampled and the joint tensile test was performed. During welding, preheating and post-heating are applied, the composition of the filler material and the feed rate are changed,
Welded joints with different 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。The joint tensile test results and hardness measurement results are shown in Table 3.
Shown in. As the standard judgment of the tensile test result, the base material strength of 9
A joint having a joint efficiency of 0% or more was accepted. Table 3
As is clearer, in all of the examples of the present invention, fracture occurred 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。Example 2 This example is an example of a dissimilar material welded joint of 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
A joint tensile test was performed after butt welding with 0A steel material (size is the same as the sintered material). The test procedure is the same as in Example 1. The joint tensile test results and hardness measurement results are shown in Table 4. As is clear from Table 4, in each of the examples of the present invention, fracture occurred 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, using this sintered material and SC480, sintered material and FCD500, and sintered material and S25C or S50C combined joint, Example 2
As a result of performing a welding test similar to the above, if it has a hardness balance defined by the present invention, it should be fractured on the side of the iron-based sintered material base material to obtain the same strength as the base material of the iron-based sintered material. 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 part of iron-based sintered materials or steel-based sintered material and steel material, cast steel, cast iron or medium-high carbon steel, since a welded joint having the same strength as the base material of the low strength side is obtained, The effect of contributing to the 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 hardness of a welding heat affected zone and 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 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Fumito Yoshino 100-1 Urakawachi Urakawachi, Fujisawa-shi, Kanagawa Kobe Steel, Fujisawa Works
Claims (3)
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がビッカース硬さＨv
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(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 portion of iron-based sintered materials, iron-based sintered material and steel material, cast steel, cast iron or medium-high carbon steel, the average hardness of the weld metal is Vickers hardness Hv.
In the range of 100 to 350, and the maximum hardness Hv (measurement load of 500 g or less) of the welding heat affected zone on the side of the iron-based sintered material is in the range of 100 to 450. Welded joint structural member.
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Ｈ
v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 portion of ferrous sintered materials, ferrous sintered material and steel, cast steel, cast iron or medium-high carbon steel, a welding heat affected zone on the ferrous sintered material side. Maximum hardness H
A sintered material welded joint structural member, wherein v is in the range of more than 450 and 600 or less, and the average hardness Hv of the weld metal is in the range of 100 to 350.
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Ｈvが３５０を超え５
００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
とを特徴とする焼結材溶接継手構造部材。3. The average hardness Hv of the weld metal exceeds 350 in a structural member having a welded joint portion of iron-based sintered materials, iron-based sintered material and steel, cast steel, cast iron or medium-high carbon steel. 5
A sintered material welded joint structural member, wherein the maximum hardness Hv of the weld heat-affected zone on the side of the iron-based sintered material is in the range of 100 to 450, in a range of 00 or less.
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 true JPH06344174A (en) | 1994-12-20 |
| JP3017378B2 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 |
|---|---|
| JP3017378B2 (en) | 2000-03-06 |
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