JP2020062688A - Welding method - Google Patents

Welding method Download PDF

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JP2020062688A
JP2020062688A JP2019236356A JP2019236356A JP2020062688A JP 2020062688 A JP2020062688 A JP 2020062688A JP 2019236356 A JP2019236356 A JP 2019236356A JP 2019236356 A JP2019236356 A JP 2019236356A JP 2020062688 A JP2020062688 A JP 2020062688A
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welding
heat
steel
cast iron
affected zone
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JP6921932B2 (en
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藤谷　泰之
Yasuyuki Fujitani
泰之 藤谷
渡辺　眞生
Masanari Watanabe
眞生 渡辺
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Mitsubishi Heavy Industries Machine Tool Co Ltd
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Mitsubishi Heavy Industries Machine Tool Co Ltd
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Abstract

To improve a strength characteristic after welded.SOLUTION: A welding method for welding a cast iron 11 (a first member) and a steel 12 (a second member) having hardness lower than that of the cast iron 11 is provided that comprises: a first step of inserting an insert material 13 (a third member) having hardness lower than that of the steel 12 between the cast iron 11 and the steel 12; a second step of welding the boundary portion between the cast iron 11 and the insert material 13; and a third step of welding the boundary portion between the steel 12 and the insert material 13, so that strength characteristics after welded can be improved.SELECTED DRAWING: Figure 1

Description

本発明は溶接方法に関する。特に、鋳鉄からなる部品と鋼からなる部品との溶接構造を有する製品、例えば、機能部品及びケースとしては、自動車の差動装置におけるデフリングギヤ及びデフケース等に代表される複数の部材の溶接構造部品を製造する際の鋳鉄溶接方法に関する。   The present invention relates to a welding method. In particular, products having a welded structure of parts made of cast iron and parts made of steel, for example, functional parts and cases are welded structural parts of a plurality of members typified by differential ring gears and differential cases in automobile differentials. The present invention relates to a cast iron welding method for manufacturing a steel.

自動車などの駆動系部品は、高強度を要求されるため、強靭な鋼や鋳鉄などが用いられており、塑性加工や鋳造によって作られた部品が、ボルト締結構造によって組み立てられる方法が取られている。   Since drive system parts such as automobiles are required to have high strength, tough steel and cast iron are used, and parts made by plastic working or casting are assembled by a bolt fastening structure. There is.

この機械的締結構造を、溶接による締結構造に代替することができれば、軽量化が可能となるが、鋳鉄と鋼との溶接では、溶融凝固部及びその周辺で起こる相変態により生成する脆弱な組織や、熱膨張や収縮に伴い発生する応力のために、割れが発生しやすい。   If this mechanical fastening structure can be replaced with a welding fastening structure, weight reduction can be achieved.However, in the welding of cast iron and steel, the fragile structure generated by the phase transformation that occurs in the melt-solidified portion and its surroundings. Also, cracks are likely to occur due to stress generated by thermal expansion and contraction.

このため、従来の鋳鉄の溶接では、Ｎｉ等のオーステナイト系の溶接ワイヤを供給しながら、溶接する方法が採用されている。   Therefore, in the conventional welding of cast iron, a method of welding while supplying an austenitic welding wire such as Ni is adopted.

図４は、このようにして鋳鉄と鋼が溶接された状態を示す模式的断面図である。鋳鉄１１と鋼１２との間には、溶接ワイヤによるオーステナイト系の溶接金属４３が形成されている。   FIG. 4 is a schematic cross-sectional view showing a state in which cast iron and steel are welded in this way. An austenitic weld metal 43 formed by a welding wire is formed between the cast iron 11 and the steel 12.

特許第５２９３８４０号公報Japanese Patent No. 5293840

しかしながら、上述の方法では溶融時の割れは防止できても、溶接による熱影響部の硬化は避けることができず、溶接のままでは、この硬化した脆い領域（レデブライトとマルテンサイトからなる相）が破壊起点となり、溶接部の信頼性が低下するため、溶接後に熱処理をする必要が生じる。   However, even if cracking during melting can be prevented by the above-mentioned method, hardening of the heat-affected zone due to welding cannot be avoided, and in the as-welded state, this hardened brittle region (a phase consisting of redeburite and martensite) Since it becomes a fracture starting point and the reliability of the welded part is reduced, it becomes necessary to perform heat treatment after welding.

ちなみに、上記特許文献１では、接合部分に予め空洞部を形成する技術が開示されている。   By the way, Patent Document 1 discloses a technique of forming a hollow portion in advance at a joint portion.

本発明では、上記技術的課題に鑑み、強度特性を改善することができる溶接方法を提供することを目的とする。   In view of the above technical problems, it is an object of the present invention to provide a welding method capable of improving strength characteristics.

上記課題を解決する第１の発明に係る溶接方法は、第１部材と該第１部材よりも硬度の低い第２部材とを溶接する溶接方法であって、前記第１部材と前記第２部材との間に、前記第２部材よりも硬度の低い第３部材を挿入する第１工程と、前記第１部材と前記第３部材との境界部分を溶接する第２工程と、前記第２部材と前記第３部材との境界部分を溶接する第３工程とを有することを特徴とする。   A welding method according to a first invention for solving the above problem is a welding method for welding a first member and a second member having a hardness lower than that of the first member, the first member and the second member. A first step of inserting a third member having lower hardness than the second member, a second step of welding a boundary portion between the first member and the third member, and the second member And a third step of welding a boundary portion between the third member and the third member.

上記課題を解決する第２の発明に係る溶接方法は、上記第１の発明に係る溶接方法において、さらに、前記第３部材の中央を溶接する第４工程を有することを特徴とする。
また、上記課題を解決する第３の発明に係る溶接方法は、上記第１又は２の発明に係る溶接方法において、前記第１工程以外の各前記工程においては、高エネルギービームを用いて溶接することを特徴とする。 A welding method according to a second invention for solving the above-mentioned problems is characterized in that, in the welding method according to the above-mentioned first invention, it further comprises a fourth step of welding the center of the third member.
Further, a welding method according to a third invention for solving the above-mentioned problems is the welding method according to the above-mentioned first or second invention, wherein welding is performed using a high energy beam in each of the steps other than the first step. It is characterized by

本発明に係る溶接方法によれば、強度特性を改善することができる。   According to the welding method of the present invention, strength characteristics can be improved.

本発明の実施例１に係る溶接方法について説明する模式的断面図である。（ａ）はインサート材を挿入した状態、（ｂ）は１パス目の溶接後の状態、（ｃ）は２パス目の溶接後の状態を、それぞれ示している。It is a typical sectional view explaining the welding method concerning Example 1 of the present invention. (A) shows a state in which an insert material is inserted, (b) shows a state after welding in the first pass, and (c) shows a state after welding in the second pass. 本発明の実施例２に係る溶接方法について説明する模式的断面図である。（ａ）は２パス目の溶接後の状態、（ｂ）は３パス目の溶接後の状態を、それぞれ示している。It is a typical sectional view explaining the welding method concerning Example 2 of the present invention. (A) shows the state after the second pass welding, and (b) shows the state after the third pass welding. 本発明の実施例３に係る溶接方法について説明する模式的断面図である。（ａ）はＶ形の開先の近傍に溶接ワイヤを突き出した状態、（ｂ）は１パス目の溶接後の状態、（ｃ）は２パス目の溶接後の状態を、それぞれ示している。It is a typical sectional view explaining the welding method concerning Example 3 of the present invention. (A) shows a state in which the welding wire is projected near the V-shaped groove, (b) shows a state after welding in the first pass, and (c) shows a state after welding in the second pass. . 従来の方法による溶接後の状態を示した模式的断面図である。It is a typical sectional view showing the state after welding by the conventional method.

以下、本発明に係る溶接方法を実施例にて図面を用いて説明する。   Hereinafter, a welding method according to the present invention will be described with reference to the drawings in embodiments.

［実施例１］
図１は、本実施例に係る溶接方法について説明する模式的断面図である。図１（ａ）はインサート材を挿入した状態、図１（ｂ）は１パス目の溶接後の状態、図１（ｃ）は２パス目の溶接後の状態を、それぞれ示している。 [Example 1]
FIG. 1 is a schematic sectional view illustrating a welding method according to this embodiment. 1A shows a state in which an insert material is inserted, FIG. 1B shows a state after welding in the first pass, and FIG. 1C shows a state after welding in the second pass.

本実施例に係る溶接方法では、鋳鉄で構成される部品と鋼で構成される部品とを溶接する際に、まず、図１（ａ）に示すように、Ｎｉあるいはオーステナイト系ステンレス等のオーステナイト系材料であるインサート材１３を、鋳鉄１１と鋼１２との間に挿入する（第１工程）。鋳鉄１１（第１部材）よりも鋼１２（第２部材）の方が硬度は低く、鋼１２よりもインサート材１３（第３部材）の方が硬度は低い。なお、特に鉄系部材においては、硬度が高ければ脆性も高くなり（脆くなり）、硬度が低ければ脆性も低くなる（脆くなくなる。粘り強くなる）。本実施例では、各部材がこれらの関係を有するものとする。   In the welding method according to the present embodiment, when welding a part made of cast iron and a part made of steel, first, as shown in FIG. 1A, Ni or austenitic stainless steel such as austenitic stainless steel is used. The insert material 13, which is a material, is inserted between the cast iron 11 and the steel 12 (first step). Steel 12 (second member) has a lower hardness than cast iron 11 (first member), and insert material 13 (third member) has a lower hardness than steel 12. Particularly, in an iron-based member, if the hardness is high, the brittleness is high (brittle), and if the hardness is low, the brittleness is low (less brittle and tough). In this embodiment, each member has these relationships.

次に、１パス目の溶接として、図１（ａ）の紙面上方側からレーザビームあるいは電子ビーム等の高エネルギービームにより、鋳鉄１１とインサート材１３との境界部分を溶接する（第２工程）。すると、図１（ｂ）に示すように、鋳鉄１１とインサート材１３との境界部分に溶接部１１Ａが形成され、溶接部１１Ａより鋳鉄１１側に熱影響部１１Ｂが形成される。この熱影響部１１Ｂは、既に説明したごとく硬化した脆い領域である。   Next, as welding in the first pass, the boundary portion between the cast iron 11 and the insert material 13 is welded from the upper side of the paper surface of FIG. 1A with a high energy beam such as a laser beam or an electron beam (second step). . Then, as shown in FIG. 1B, a welded portion 11A is formed at the boundary between the cast iron 11 and the insert material 13, and a heat-affected zone 11B is formed closer to the cast iron 11 than the welded portion 11A. The heat-affected zone 11B is a brittle region that is hardened as described above.

さらに、２パス目の溶接として、図１（ｂ）の紙面上方側から高エネルギービームにより鋼１２とインサート材１３との境界部分を溶接する（第３工程）。すると、図１（ｃ）に示すように、鋼１２とインサート材１３との境界部分には溶接部１２Ａが形成される。また、２パス目の溶接の熱伝導により、１パス目の溶接で形成された鋳鉄１１の熱影響部１１Ｂを焼き戻す。これにより、熱影響部１１Ｂの硬度を低減することができる。   Further, as welding in the second pass, the boundary portion between the steel 12 and the insert material 13 is welded from the upper side of the paper surface of FIG. 1B with a high energy beam (third step). Then, as shown in FIG. 1C, a welded portion 12A is formed at the boundary portion between the steel 12 and the insert material 13. Further, the heat-affected zone 11B of the cast iron 11 formed by the first-pass welding is tempered by the heat conduction of the second-pass welding. Thereby, the hardness of the heat affected zone 11B can be reduced.

本実施例では、上述の方法により、非常に硬度の高い鋳鉄１１側の熱影響部１１Ｂの硬さを低減することができ、割れ防止を図るとともに、強度特性を改善することができる。   In the present embodiment, the hardness of the heat-affected zone 11B on the side of the cast iron 11 having a very high hardness can be reduced by the above-described method, cracking can be prevented, and strength characteristics can be improved.

なお、上記２パス目の溶接において、溶接部１２Ａより鋼１２側にも熱影響部が形成されるが、この熱影響部は鋳鉄側の熱影響部１１Ｂに比べ硬くない（脆くない）ため、本実施例では言及していない。   In the second pass welding, a heat-affected zone is also formed on the steel 12 side of the welded zone 12A, but this heat-affected zone is not hard (not brittle) as compared with the heat-affected zone 11B on the cast iron side. It is not mentioned in this embodiment.

［実施例２］
本実施例は、実施例１の作用効果に加え、実施例１における２パス目の溶接により形成される鋼１２側の熱影響部の硬さを低減するものである。以下では、本実施例における２パス目の溶接までの手順は実施例１と同様のため、説明を省略し、２パス目の溶接後から説明する。 [Example 2]
In addition to the effects of the first embodiment, the present embodiment reduces the hardness of the heat affected zone on the steel 12 side formed by the second pass welding in the first embodiment. In the following, since the procedure up to the second pass welding in the present embodiment is the same as that in the first embodiment, the description thereof will be omitted and the description will be given after the second pass welding.

図２は、本実施例に係る溶接方法について説明する模式的断面図である。図２（ａ）は２パス目の溶接後の状態、図２（ｂ）は３パス目の溶接後の状態を、それぞれ示している。   FIG. 2 is a schematic cross-sectional view illustrating the welding method according to this embodiment. 2A shows the state after the second pass welding, and FIG. 2B shows the state after the third pass welding.

図２（ａ）に示すように、実施例１で説明した２パス目の溶接後、溶接部１２Ａより鋼１２側には熱影響部１２Ｂが形成される。   As shown in FIG. 2A, after the second pass welding described in the first embodiment, the heat-affected zone 12B is formed on the steel 12 side of the welded zone 12A.

本実施例では、３パス目の溶接として、インサート材１３の中央すなわち溶接部１１Ａと溶接部１２Ａとから等間隔の位置を、図２（ａ）の紙面上方から高エネルギービームにより溶接する（第４工程）。すると、図２（ｂ）に示すように、インサート材１３の中央には溶接部１３Ａが形成される。なお、その際、溶接部１１Ａ，１２Ａまでは溶かしてもよいが、熱影響部１１Ｂ，１２Ｂは溶かさないようにする。   In this embodiment, as the third pass welding, the center of the insert material 13, that is, the positions equidistant from the welded portion 11A and the welded portion 12A are welded with a high-energy beam from above the plane of the paper of FIG. 4 steps). Then, as shown in FIG. 2B, a welded portion 13A is formed in the center of the insert material 13. At this time, the welded parts 11A and 12A may be melted, but the heat-affected parts 11B and 12B are not melted.

すると、上記３パス目の熱伝導により、１パス目の溶接で形成された鋳鉄１１側の熱影響部１１Ｂ、及び、２パス目の溶接で形成された鋼１２側の熱影響部１２Ｂを焼き戻すこととなる。これにより、熱影響部１１Ｂ，１２Ｂの硬度を低減することができる。   Then, due to the heat conduction of the third pass, the heat-affected zone 11B on the cast iron 11 side formed by the first-pass welding and the heat-affected zone 12B on the steel 12 side formed by the second-pass welding are burned. Will be returned. As a result, the hardness of the heat-affected zones 11B and 12B can be reduced.

本実施例では、非常に硬度の高い鋳鉄１１側の熱影響部１１Ｂだけでなく、鋼１２側の熱影響部１２Ｂの硬さの低減も行うことができ、割れ防止を図るとともに、強度特性を維持することができる。   In this embodiment, not only the heat-affected zone 11B on the cast iron 11 side, which has a very high hardness, but also the heat-affected zone 12B on the steel 12 side can be reduced in hardness to prevent cracking and to improve strength characteristics. Can be maintained.

［実施例３］
本実施例は、板状の鋳鉄と鋼との間にＶ形の開先を形成し溶接を行う場合に用いる方法である。図３は、本実施例に係る溶接方法について説明する模式的断面図である。図３（ａ）はＶ形の開先の近傍に溶接ワイヤを突き出した状態、図３（ｂ）は１パス目の溶接後の状態、図３（ｃ）は２パス目の溶接後の状態を、それぞれ示している。 [Example 3]
The present example is a method used when welding is performed by forming a V-shaped groove between a plate-shaped cast iron and steel. FIG. 3 is a schematic cross-sectional view illustrating the welding method according to this embodiment. 3 (a) shows a state in which the welding wire is projected near the V-shaped groove, FIG. 3 (b) shows a state after welding in the first pass, and FIG. 3 (c) shows a state after welding in the second pass. Are shown respectively.

本実施例に係る溶接方法では、まず、図３（ａ）に示すように、板状の鋳鉄２１と鋼２２との間に形成されたＶ形の開先ａに、溶融ワイヤ２３を突き出した状態で、１パス目の溶接として、破線矢印で示す方向に向けて高エネルギービームにより溶接ワイヤ２３を溶かす。その際、開先ａ近傍の鋳鉄２１及び鋼２２も同時に溶ける。   In the welding method according to the present embodiment, first, as shown in FIG. 3 (a), the molten wire 23 is projected to the V-shaped groove a formed between the plate-shaped cast iron 21 and the steel 22. In this state, as the first pass welding, the welding wire 23 is melted by the high energy beam in the direction indicated by the dashed arrow. At that time, the cast iron 21 and the steel 22 near the groove a are also melted at the same time.

すると、図３（ｂ）に示すように、鋳鉄２１と鋼２２との間に溶融金属３３が形成された状態となる。また、この溶融金属３３より鋳鉄２１側には熱影響部２１Ｂが、鋼２２側には熱影響部２２Ｂが、それぞれ形成される。   Then, as shown in FIG. 3B, the molten metal 33 is formed between the cast iron 21 and the steel 22. A heat-affected zone 21B is formed on the cast iron 21 side of the molten metal 33, and a heat-affected zone 22B is formed on the steel 22 side.

そこで、２パス目の溶接として、図３（ｂ）の破線矢印で示すように、溶融金属３３の鋳鉄２１側の熱影響部２１Ｂと鋼２２側の熱影響部２２Ｂとの中間付近より鋼２２側の熱影響部２２Ｂ寄りに高エネルギービームにより溶接する。すると、１パス目溶接で形成された鋳鉄２１側の熱影響部２１Ｂを焼き戻すこととなる。これにより、鋳鉄２１側の熱影響部２１Ｂの硬度を低減することができる。   Therefore, as the second pass welding, as shown by the broken line arrow in FIG. Welding with a high-energy beam near the heat-affected zone 22B on the side. Then, the heat-affected zone 21B on the cast iron 21 side formed by the first pass welding is tempered. Thereby, the hardness of the heat-affected zone 21B on the cast iron 21 side can be reduced.

図３（ｃ）に示すように、２パス目の溶接により、新たに溶接部３３´が形成され、また、溶接部３３´の鋳鉄２１側に熱影響部２１Ｂ´が、鋼２２側に熱影響部２２Ｂ´が、それぞれ形成される。そこで、レーザを弱めて破線矢印で示すように、２パス目の溶接と同じ位置を溶接すると、熱影響部２１Ｂ´，２２Ｂ´を焼き戻すこととなる。これにより、熱影響部２１Ｂ´，２２Ｂ´の硬度を低減することができる。   As shown in FIG. 3 (c), a new welded portion 33 ′ is formed by the second-pass welding, and the heat-affected zone 21 B ′ is heat-treated on the cast iron 21 side of the welded portion 33 ′ and the steel 22 side. Affected parts 22B 'are formed respectively. Therefore, if the laser is weakened and the same position as the welding in the second pass is welded as indicated by the broken line arrow, the heat-affected zones 21B 'and 22B' are tempered. As a result, the hardness of the heat-affected zones 21B 'and 22B' can be reduced.

本実施例では、板状の鋳鉄と鋼との間にＶ形の開先を形成し溶接を行う場合に、鋳鉄２１側の熱影響部２１Ｂ，２１Ｂ´、及び、鋼２２側の熱影響部２２Ｂ´の硬さの低減を行うことができ、割れ防止を図るとともに、強度特性を維持することができる。   In this embodiment, when a V-shaped groove is formed between plate-shaped cast iron and steel and welding is performed, the heat-affected zones 21B and 21B 'on the cast iron 21 side and the heat-affected zone on the steel 22 side are formed. The hardness of 22B 'can be reduced, cracking can be prevented, and strength characteristics can be maintained.

本発明は溶接方法として好適である。   The present invention is suitable as a welding method.

１１ 鋳鉄（第１部材）
１１Ａ （鋳鉄１１側の）溶接部
１１Ｂ （鋳鉄１１側の）熱影響部
１２ 鋼（第２部材）
１２Ａ （鋼１２側の）溶接部
１２Ｂ （鋼１２側の）熱影響部
１３ インサート材（第３部材）
２１ （板状の）鋳鉄
２１Ｂ，２１Ｂ´ （鋳鉄２１側の）熱影響部
２２ （板状の）鋼
２２Ｂ，２２Ｂ´ （鋼２２側の）熱影響部
２３ 溶接ワイヤ
３３ 溶融金属
３３´ 溶接部
４３ インサート材 11 Cast iron (first member)
11A (cast iron 11 side) welded portion 11B (cast iron 11 side) heat affected zone 12 steel (second member)
12A (Steel 12 side) Welded portion 12B (Steel 12 side) Heat Affected Zone 13 Insert Material (Third Member)
21 (plate-shaped) cast iron 21B, 21B '(cast iron 21 side) heat-affected zone 22 (plate-shaped) steel 22B, 22B' (steel 22 side) heat-affected zone 23 Welding wire 33 Molten metal 33 'Weld zone 43 Insert material

上記課題を解決する第１の発明に係る溶接方法は、
第１部材と該第１部材よりも硬度の低い第２部材とを溶接する溶接方法であって、前記第１部材と前記第２部材との間に形成されたＶ形の開先に溶接ワイヤを突き出した状態で、前記溶接ワイヤを溶かして前記第１部材と前記第２部材との間に溶融金属を形成する第１工程と、前記溶融金属を溶接して前記第１部材と前記溶融金属との間の第１熱影響部を焼き戻す第２工程とを有することを特徴とする。 A welding method according to a first invention for solving the above-mentioned problems,
A welding method for welding a first member and a second member having a hardness lower than that of the first member, wherein a welding wire is formed in a V-shaped groove formed between the first member and the second member. First step of melting the welding wire to form molten metal between the first member and the second member in a state of protruding, and welding the molten metal to the first member and the molten metal and having a second step of tempering the first heat-affected zone between.

上記課題を解決する第２の発明に係る溶接方法は、上記第１の発明に係る溶接方法において、さらに、前記第２工程により溶接された前記溶融金属をさらに溶接して前記第２部材と前記溶融金属との間の第２熱影響部を焼き戻す第３工程を有することを特徴とする。
また、上記課題を解決する第３の発明に係る溶接方法は、上記第２の発明に係る溶接方法において、前記第３工程は、前記第１熱影響部と前記溶融金属との間の第３熱影響部を焼き戻すことを特徴とする。
また、上記課題を解決する第３の発明に係る溶接方法は、上記第２の発明に係る溶接方法において、前記第３工程は、前記第１熱影響部と前記溶融金属との間の第３熱影響部を焼き戻すことを特徴とする。
また、上記課題を解決する第４の発明に係る溶接方法は、上記第２の発明に係る溶接方法において、前記第２工程は、前記第１熱影響部と前記第２熱影響部との中間付近よりも前記第２熱影響部側を溶接することを特徴とする。
また、上記課題を解決する第５の発明に係る溶接方法は、上記第４の発明に係る溶接方法において、前記第３工程は、前記第２工程と同じ位置を溶接することを特徴とする。
また、上記課題を解決する第６の発明に係る溶接方法は、上記第５の発明に係る溶接方法において、前記第２工程および前記第３工程は、高エネルギービームを用いて溶接する工程であり、前記第３工程は、前記第２工程よりもレーザを弱めて溶接することを特徴とする。 Welding method according to a second invention for solving the problems is the welding method according to the above Symbol first invention, the al and further welding the molten metal which is welded by the second step the second It is characterized by having a third step of tempering the second heat-affected zone between the member and the molten metal.
Further, the welding method according to the third invention for solving the above SL problems is the welding method according to the above Symbol second invention, the third step, between the molten metal and the first heat-affected zone It is characterized in that the third heat-affected zone is tempered .
Further, a welding method according to a third invention for solving the above-mentioned problems is the welding method according to the above-mentioned second invention, wherein the third step is a third step between the first heat-affected zone and the molten metal. The heat-affected zone is tempered.
Moreover, the welding method which concerns on the 4th invention which solves the said subject is the welding method which concerns on the said 2nd invention, The said 2nd process is an intermediate | middle of the said 1st heat affected zone and the said 2nd heat affected zone. It is characterized in that the second heat-affected zone side is welded rather than the vicinity.
Further, a welding method according to a fifth invention for solving the above-mentioned problems is characterized in that, in the welding method according to the fourth invention, the third step welds the same position as the second step.
A welding method according to a sixth aspect of the invention for solving the above-mentioned problems is the welding method according to the fifth aspect, wherein the second step and the third step are welding steps using a high energy beam. The third step is characterized in that the laser is weakened and welding is performed more than in the second step.

本実施例に係る溶接方法では、まず、図３（ａ）に示すように、板状の鋳鉄２１と鋼２２との間に形成されたＶ形の開先ａに、溶接ワイヤ２３を突き出した状態で、１パス目の溶接として、破線矢印で示す方向に向けて高エネルギービームにより溶接ワイヤ２３を溶かす。その際、開先ａ近傍の鋳鉄２１及び鋼２２も同時に溶ける。 In the welding method according to the present embodiment, first, as shown in FIG. 3 (a), the groove a V-shaped formed between the plate-like cast iron 21 and steel 22, protruding the welding wire 23 In this state, as the first pass welding, the welding wire 23 is melted by the high energy beam in the direction indicated by the broken line arrow. At that time, the cast iron 21 and the steel 22 near the groove a are also melted at the same time.

Claims (3)

第１部材と該第１部材よりも硬度の低い第２部材とを溶接する溶接方法であって、
前記第１部材と前記第２部材との間に、前記第２部材よりも硬度の低い第３部材を挿入する第１工程と、
前記第１部材と前記第３部材との境界部分を溶接する第２工程と、
前記第２部材と前記第３部材との境界部分を溶接する第３工程とを有することを特徴とする溶接方法。 A welding method for welding a first member and a second member having a hardness lower than that of the first member,
A first step of inserting a third member having a hardness lower than that of the second member between the first member and the second member;
A second step of welding a boundary portion between the first member and the third member;
And a third step of welding a boundary portion between the second member and the third member. さらに、
前記第３部材の中央を溶接する第４工程を有することを特徴とする請求項１に記載の溶接方法。 further,
The welding method according to claim 1, further comprising a fourth step of welding the center of the third member. 前記第１工程以外の各前記工程においては、高エネルギービームを用いて溶接することを特徴とする請求項１又は２に記載の溶接方法。
The welding method according to claim 1, wherein welding is performed using a high energy beam in each of the steps other than the first step.
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Citations (6)

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Publication number Priority date Publication date Assignee Title
JPS536244A (en) * 1976-07-07 1978-01-20 Hitachi Ltd Electron beam welding
JPS5511491A (en) * 1978-04-04 1980-01-26 Voest Ag Apparatus for correctly placing conveyed bendable indivisual sheet on suspport table
JPS63171265A (en) * 1987-01-07 1988-07-15 Sumitomo Metal Ind Ltd Method for joining ti stock and al stock
JPH07286528A (en) * 1994-04-19 1995-10-31 N D K Kako Center Kk Electron beam joining method of turbine rotor shaft
JP2000117470A (en) * 1998-10-15 2000-04-25 Toshiba Corp Welding method using high energy beam welding method of ferritic stainless steel or martensitic stainless steel and gas turbine combustor manufactured by its method
JP2009068380A (en) * 2007-09-11 2009-04-02 Mitsubishi Heavy Ind Ltd Turbine rotor and method for manufacturing rotor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS536244A (en) * 1976-07-07 1978-01-20 Hitachi Ltd Electron beam welding
JPS5511491A (en) * 1978-04-04 1980-01-26 Voest Ag Apparatus for correctly placing conveyed bendable indivisual sheet on suspport table
JPS63171265A (en) * 1987-01-07 1988-07-15 Sumitomo Metal Ind Ltd Method for joining ti stock and al stock
JPH07286528A (en) * 1994-04-19 1995-10-31 N D K Kako Center Kk Electron beam joining method of turbine rotor shaft
JP2000117470A (en) * 1998-10-15 2000-04-25 Toshiba Corp Welding method using high energy beam welding method of ferritic stainless steel or martensitic stainless steel and gas turbine combustor manufactured by its method
JP2009068380A (en) * 2007-09-11 2009-04-02 Mitsubishi Heavy Ind Ltd Turbine rotor and method for manufacturing rotor

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