JP3720103B2 - Metal material welding method and welded product - Google Patents

Metal material welding method and welded product Download PDF

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JP3720103B2
JP3720103B2 JP31647895A JP31647895A JP3720103B2 JP 3720103 B2 JP3720103 B2 JP 3720103B2 JP 31647895 A JP31647895 A JP 31647895A JP 31647895 A JP31647895 A JP 31647895A JP 3720103 B2 JP3720103 B2 JP 3720103B2
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flux
filler material
welding
metal
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JPH09155548A (en
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武典 橋本
康弘 納
茂利 成願
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Showa Denko KK
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Showa Denko KK
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Description

【0001】
【発明の属する技術分野】
この発明は、溶加材を用いた金属材の溶接方法及び溶接品に関する。
【0002】
【従来の技術】
アルミニウムを始めとする各種金属材の溶接、特に共金溶接においては、従来より溶接割れが問題となっており、その対策として、接合部に溶加材を添加することが一般的である。溶加材の添加については、例えば、田中一雄により、2000系、5000系、6000系、7000系等の殆どのアルミニウム合金材の溶接において、溶加材を用いない溶接では割れが発生しているのに対して、溶加材を用いた場合は健全な溶接を行い得ることが報告されている(アルミニウム合金の溶接、溶接技術、5月号、p.164、1988)。
【0003】
一方、近年ではアルミニウムの優れた加工性を生かした複雑断面形状の押出材の需要の増大に伴い、それらの材料の溶接の必要性も高まっている。
【0004】
【発明が解決しようとする課題】
しかしながら、母材の形状が複雑になると、溶接継手部に溶加材を添加することが作業上困難となる場合も多く、溶接方法の改善が望まれている。なお、一般に、複雑形状の金属材の接合方法としてろう付が行われているが、母材を溶融しないろう付では相対的に継手強度が低いため、構造部材のように高い継手強度が要求される用途には適さない。
【0005】
この発明は、このような技術背景に鑑み、複雑形状の母材にも溶加材を添加して溶接を行うことのできる金属材の溶接方法及び溶接品の提供を目的とする。
【0006】
【課題を解決するための手段】
この発明は、前記目的を達成するために、金属製被接合部材(2)(2)の組み付けにより形成される接合用間隙(3) に、溶加材成分とフラックス成分とにより形成されたフラックス含有溶加材(4) を挿入し、前記被接合部材(2)(2)を介して前記フラックス含有溶加材(4) を加熱して、被接合部材(2)(2)とフラックス含有溶加材(4) とを融合させ、被接合部材(2)(2)を接合することを特徴とする。
【0007】
この発明の溶接方法を適用する被接合部材(2) は、溶接可能な金属材であれば特に限定されない。しかし、この溶接方法は、特に複雑な形状に成形されることの多いアルミニウムまたはその合金材、なかでも同系組成材どうしの共金溶接に有効である。
【0008】
この溶接方法は、前記被接合部材(2) を介してフラックス含有溶加材(4) を加熱するものであるから、被接合部材(2)(2)の形状は、これらを組み付けたときにフラックス含有溶加材(4) を挿入する間隙(3) を形成できるものに限られる。例えば、図1(A)に示す被接合部材(2)(2)は、それぞれ先端部に溶接用フランジ(1) が突設されたものであり、互いのフランジ(1) を相手材に当接するように組み付けることにより接合用間隙(3) が形成され、この間隙(3) にフラックス含有溶加材(4) を挿入する。
【0009】
また、加熱用の熱源の種類も被接合部材(2) およびフラックス含有溶加材(4)を溶融できる限り特に限定されず、各種アーク、レーザー、電子ビーム、アセチレンガス、高周波等を適宜用いる。また、加熱は、接合部の被接合部材(2) および溶加材(4) を完全に溶融させ一体化が可能な限り、一方向のみから行っても、二方向以上から行っても良い。例えば図1(A)に示す突き合わせ継手で接合用間隙(3) が比較的厚い場合、接合部の片側のみから加熱すると溶融不足を起こすおそれがあるが(図1(C))、両側から加熱することにより接合部を完全に溶融して良好な溶接を確実に行える(図1(B))。なお、図1において(5) は熱源、(6) は被接合部材(2) と溶加材(4) とが融合した溶融金属である。
【0010】
この発明に用いるフラックス含有溶加材(4) は、被接合部材(2) の材質に応じて通常接合用合金として用いられる溶加材成分と、フラックス成分とを配合したものである。
【0011】
前記溶加材成分としては、例えば前記被接合部材(2) がアルミニウムまたはその合金材の場合にはAl−Si系合金を用いる。具体的組成としては、融点調整を主目的としてSiを13wt%以下、融点調整および強度向上を主目的としてCuを7wt%以下、強度向上を主目的としてMgを6wt%以下、耐食性向上を主目的としてMnを1wt%以下を含有し、残部がAlおよび不純物よりなり、不純物としてのFe、Zn、Cr、V、Ti、Zrがそれぞれ0.5wt%以下に規制されているものが好ましい。
【0012】
また、前記フラックス成分は、その種類が特に限定されるものではないが、被接合部材(2) がアルミニウムまたはその合金材の場合は溶接温度および溶加材の融点との関係で650℃以下で溶融するものが好ましく、一般式;KαAlFα +3 (αは1以上の整数)で表されるKA4、K2AlF5およびK3AlF6、KFとAlF3との混合物または共晶組成物、フルオロアルミン酸カリウム錯体等の弗化物系フラックスを例示できる。
【0013】
また、フラックス成分含有量は、1〜30wt%の範囲が好ましい。この範囲よりもフラックスが少なくなると良好な溶接を達成できず、また多くなってもフラックス効果が飽和するとともに、後述の方法によりフラックス含有溶加材を製造する際に固形化が困難となる。特に好ましい含有量の下限値は5wt%、上限値は20wt%である。
【0014】
前記フラックス含有溶加材(4) は、その製造方法を問わず使用できるが、溶加材成分とフラックス成分との一体化や成分調整が容易であり、かつ接合用間隙(3) 形状に適合する形状への成形加工も容易であることから、溶加材成分粉末およびフラックス成分粉末の混合粉末を加圧することにより圧粉体に成形固形化する方法、あるいはさらに該圧粉体を加熱したのち、所要形状に二次成形する方法を推奨でききる。
【0015】
前記溶加材成分粉末は、Al粉末、Si粉末、Cu粉末等の単独粉末を所要割合で配合しても良いし、所要組成のAl−Si系合金粉末でも良い。また、単独粉末と合金粉末とを併用しても良い。なお、このような溶加材成分粉末は、圧粉体の密度を可及的に高めるために、アトマイズ粉等の球状粉を使用することが好ましい。
【0016】
前記混合粉末から高密度で元素分布が均一な圧粉体を得るには、粒度調整した材料粉末を使用することが好ましい。Si粉末およびCu粉末等の任意添加元素は、Al粉末よりも粒子径が小さい方が好ましく、フラックス成分粉末もAl粉末より小さい方が好ましい。ただし、Al−Si系合金粉末を使用する場合は、AlおよびSiを単体で用いる場合よりも粒子径は若干大きくても高密度の圧粉体に固形化することができる。具体的な粒子径としては、Al粉末は1〜200μm、Si粉末は1〜100μm、Al−Si系合金粉末は1〜300μm、Al、Si以外の任意添加元素粉末は1〜100μm、フラックス成分粉末は1〜100μm、の各範囲のものを使用するのが好ましい。
【0017】
圧粉体の形成は、前記混合粉末を成形用金型内に充填してこれを加圧することにより行う。圧粉体は、多数の気孔を含有する脆い状態でも金型から離型可能で次工程へのハンドリングができる程度に固形化していれば良いから、高密度に圧粉する必要はなく50%以上あれば固形化が可能である。そのため、圧粉を高温下で行う必要はなく冷間圧粉も可能である。一方、圧粉温度が高すぎると金型内壁に熱融着して離型できなくなる。Al−Si系の溶加材では、圧粉温度の上限値は550℃未満が好ましく、特に400℃未満が好ましい。また、前記温度域では材料粉末が酸化するおそれがないため、非酸化雰囲気中で圧粉する必要はなく、大気中で圧粉することができる。
【0018】
成形用金型から離型した圧粉体は加熱して軟化させたのち、押出等の二次成形を行って所要形状のフラックス含有溶加材とする。加熱温度は、二次成形が可能な程度に粒子が軟化すれば良く完全に溶融させる必要はないので、Al−Si系の溶加材では300〜575℃が好ましい。加熱雰囲気は、比較的圧粉体密度が低く多数の気孔を含有している場合や前記加熱温度が高い場合は、ろう材成分粉末が酸化しやすいため、溶接性の低下防止を目的として非酸化性雰囲気中で行うことが好ましいが、比較的圧粉体密度が高い場合や加熱温度が低い場合で酸化のおそれのないときは大気中で加熱しても良い。
【0019】
この発明では、被接合部材(2) の加熱とともに接合部の外部から溶加材(4) を供給するのではなく、予め加熱前に組み付けた被接合部材(2)(2)間の間隙(3) にフラックス含有溶加材(4) を挿入しておくので、外部からの供給が困難な形状の継手にも溶加材を添加できることとなり、接合部において被接合部材(2) とフラックス含有溶加材(4) とを融合させることができ溶接割れを抑制することができる。その上、溶加材(4) にはフラックスが含有されているので、接合面の酸化膜の除去が行われ、酸化膜の巻き込み、ブローホール、ピンホールの発生が抑制され、良好な溶接が達成される。また、フラックス含有溶加材(4) の加熱は、被接合部材(2) を介して間接的に行われるため、温度上昇は緩やかであり被接合部材(2) に先んじてフラックスだけが溶融して接合部から流失したり蒸発するおそれはなく、確実にフラックス効果が得られる。
【0020】
【実施例】
次に、この発明の金属材の溶接方法の具体的実施例について、図面を参照しつつ説明する。
【0021】
図1に示すように、被接合部材(母材)として先端部側縁に溶接用フランジ(1) が突設され、表1に示す組成のAl合金製中空押出材(2) を用いた。このような形状の2個の押出材(2)(2)を互いのフランジ(1) が相手材の端面に当接するように組み付けた。そして、組み付けによりフランジ(1)(1)間に形成された間隙(3) に、表1に示す組成の溶加材(4) を挿入し、あるいは溶加材(4) を挿入することなく、接合部の両外側から熱源(5) の種類を変えて加熱し溶接した。溶接条件は次のとおりである。
(実施例1)
DCSP−TIG法により、アーク電流170A、溶接速度30cm/min、シールドガス(Arガス)流量5×10-33/minの条件で溶接した。
(実施例2)
YAGレーザ法により、パルスエネルギー30J、パルス幅1.5ms、ビームスポット径2mm、溶接速度8cm/minの条件で溶接した。
(実施例3)
電子ビーム法により、加速電圧100kV、ビーム電流5mA、ビーム径2mm、溶接速度9cm/minの条件で溶接した。
(実施例4)
プラズマアーク法により、アーク電流200A、溶接速度60cm/minの条件で溶接した。
(実施例5)
アセチレンガス法により、溶接速度20cm/minの条件で溶接した。
(実施例6)
高周波誘導加熱法により、投入エネルギー約30kW、溶接速度10cm/minの条件で溶接した。
(比較例1)
溶加材としてフラックスを含有しないものを使用し、シールドガス(Arガス)流量を12×10-33/minとしたことを除き、実施例1と同じ条件で溶接した。
(比較例2)
溶加材としてフラックスを含有しないものを使用したことを除き、実施例2と同じ条件で溶接した。
(比較例3)
溶加材を使用しなかったことを除き、実施例1と同じ条件で溶接した。
(比較例4)
溶加材を使用しなかったことを除き、実施例2と同じ条件で溶接した。
【0022】
以上の溶接品について、接合部の外観および割れについて肉眼で観察するとともに、引張試験を行った。外観はブローホールやピンホールのないものを「良」とし、これらのあるものを「不良」とした。また、引張試験は溶接品が破断するまで引張るものとし、破断箇所を調べた。表1に、これらの結果を示すとともに、各溶接方法の概略を再掲する。
【0023】
【表1】

Figure 0003720103
【0024】
表1の結果から、この発明の各実施例は、外部から溶加材を供給できないような形状の継手においても溶加材の添加が可能となり、外観品質が良く溶接割れもない良好な溶接を達成できることが確認できた。また、実施例1と比較例1とを比較すると、フラックスの存在により、シールドガス流量を減らしても酸化膜の除去が行われ、良好な溶接が可能であることが明白である。また、実施例2と比較例2とを比較すると、フラックスの存在により溶接品質が向上することも確認できた。
【0025】
【発明の効果】
以上の次第で、この発明は、金属製被接合部材の組み付けにより形成される接合用間隙に、溶加材成分とフラックス成分とにより形成されたフラックス含有溶加材を挿入し、前記被接合部材を介して前記フラックス含有溶加材を加熱して、被接合部材とフラックス含有溶加材とを融合させ、被接合部材を接合するものであるから、外部からの溶加材供給が困難な形状の金属材についても溶加材を添加した溶接が可能となり、溶接割れの発生を抑制することができる。その上、添加される溶加材にはフラックスが含有されているため、接合部には溶加材の添加とともにフラックスも添加されることなり、酸化膜が除去されて外観品質の良い溶接製品が得られる。また、フラックスの添加により、従来非酸化性の加熱雰囲気が必要とされた加熱源を用いる場合にも、大気中、或いはより大気に近い雰囲気での溶接が可能となり、シールドガス等の使用量が減少し溶接コストを低減させるができる。また、TIGにより溶接を行う場合には、従来、クリーニング作用を得るために交流により行うことが必要であったが、フラックス含有溶加材のフラックスによりクリーニング作用が発揮されるため、直流により行うことができるようになり、このため溶け込み深さを大きくできる効果もある。
【図面の簡単な説明】
【図1】金属材の溶接方法の実施例を示す要部断面図であり、(A)は被接合部材と溶加材を組み付けた状態、(B)は接合部の両側から加熱した結果、(C)は接合部の片側のみから加熱した結果を示している。
【符号の説明】
2…被接合部材
4…フラックス含有溶加材
3…間隙[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for welding a metal material using a filler metal and a welded product .
[0002]
[Prior art]
In the welding of various metal materials including aluminum, especially in the case of co-metal welding, weld cracking has been a problem in the past, and as a countermeasure, it is common to add a filler material to the joint. Regarding the addition of the filler material, for example, by Kazuo Tanaka, in welding of most aluminum alloy materials such as 2000 series, 5000 series, 6000 series, 7000 series, etc., cracks are generated in welding without using the filler material. On the other hand, it has been reported that when a filler metal is used, sound welding can be performed (welding of aluminum alloy, welding technology, May issue, p.164, 1988).
[0003]
On the other hand, in recent years, with an increase in demand for extruded materials having a complicated cross-sectional shape that takes advantage of the excellent workability of aluminum, the necessity of welding these materials has also increased.
[0004]
[Problems to be solved by the invention]
However, when the shape of the base material becomes complicated, it is often difficult to add a filler material to the weld joint, and improvement of the welding method is desired. In general, brazing is performed as a method for joining complex-shaped metal materials, but brazing that does not melt the base metal has a relatively low joint strength, and thus requires a high joint strength like a structural member. Not suitable for use.
[0005]
In view of such a technical background, an object of the present invention is to provide a metal material welding method and a welded product that can be welded by adding a filler metal to a base material having a complicated shape.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a flux formed by a filler material component and a flux component in a bonding gap (3) formed by assembling metal workpieces (2) and (2). Insert the melt-containing material (4), heat the flux-containing melt material (4) through the members to be joined (2) and (2), and join the members to be joined (2) (2) and the flux It is characterized by fusing the filler material (4) and joining the members to be joined (2) and (2).
[0007]
The member to be joined (2) to which the welding method of the present invention is applied is not particularly limited as long as it is a weldable metal material. However, this welding method is particularly effective for co-welded welding of aluminum or its alloy material, which is often formed into a complicated shape, among other similar materials.
[0008]
Since this welding method heats the flux-containing filler material (4) via the member to be joined (2), the shape of the members to be joined (2) and (2) is as follows. It is limited to the one that can form the gap (3) for inserting the flux-containing filler material (4). For example, the welded members (2) and (2) shown in FIG. 1 (A) have welding flanges (1) projecting from the tips, and the flanges (1) are pressed against the mating material. By assembling so as to be in contact with each other, a bonding gap (3) is formed, and a flux-containing filler material (4) is inserted into the gap (3).
[0009]
Also, the type of heat source for heating is not particularly limited as long as the member to be joined (2) and the flux-containing filler material (4) can be melted, and various arcs, lasers, electron beams, acetylene gas, high frequency, and the like are appropriately used. Further, the heating may be performed from only one direction or from two or more directions as long as the member to be bonded (2) and the filler material (4) in the bonded portion can be completely melted and integrated. For example, when the joint gap (3) is relatively thick in the butt joint shown in FIG. 1 (A), heating from only one side of the joint may cause insufficient melting (FIG. 1 (C)). By doing so, the joint can be completely melted to ensure good welding (FIG. 1B). In FIG. 1, (5) is a heat source, and (6) is a molten metal in which the member to be joined (2) and the filler material (4) are fused.
[0010]
The flux-containing filler material (4) used in the present invention is a mixture of a filler material component that is usually used as an alloy for bonding according to the material of the member to be joined (2), and a flux component.
[0011]
As the filler material component, for example, when the member to be joined (2) is aluminum or an alloy material thereof, an Al—Si based alloy is used. Specifically, Si is 13 wt% or less for the main purpose of adjusting the melting point, Cu is 7 wt % or less for the main purpose of adjusting the melting point and improving the strength, and 6 wt % or less of Mg for the main purpose of improving the strength. The main purpose is to contain Mn in an amount of 1 wt % or less, the balance being Al and impurities, and Fe, Zn, Cr, V, Ti, and Zr as impurities being regulated to 0.5 wt% or less respectively. .
[0012]
Further, the type of the flux component is not particularly limited, but when the member to be joined (2) is aluminum or an alloy material thereof, the temperature is 650 ° C. or less in relation to the welding temperature and the melting point of the filler metal. What melts is preferable, and KA l F 4 , K 2 AlF 5, K 3 AlF 6 , a mixture of FF and AlF 3 or a eutectic composition represented by the general formula: KαAlFα +3 (α is an integer of 1 or more) And fluoride fluxes such as potassium fluoroaluminate complex.
[0013]
The flux component content is preferably in the range of 1 to 30 wt%. If the flux is less than this range, good welding cannot be achieved, and even if the flux is increased, the flux effect is saturated, and solidification becomes difficult when producing a flux-containing filler material by the method described below. A particularly preferable lower limit of the content is 5 wt%, and an upper limit is 20 wt%.
[0014]
The flux-containing filler material (4) can be used regardless of its production method, but it is easy to integrate the filler material component and the flux component, and to adjust the component, and to fit the shape of the bonding gap (3). Since it is easy to mold into the shape to be formed, a method of forming and solidifying the green compact by pressurizing the mixed powder of the filler material component powder and the flux component powder, or after further heating the green compact We can recommend the method of secondary molding to the required shape.
[0015]
The filler material component powder may be a single powder such as Al powder, Si powder, Cu powder, or the like, or may be an Al—Si alloy powder having a required composition. Moreover, you may use together single powder and alloy powder. In addition, in order to increase the density of the green compact as much as possible, it is preferable to use spherical powder such as atomized powder as the filler material component powder.
[0016]
In order to obtain a green compact having a high density and a uniform element distribution from the mixed powder, it is preferable to use a material powder having an adjusted particle size. Arbitrary additive elements such as Si powder and Cu powder are preferably smaller in particle diameter than Al powder, and the flux component powder is preferably smaller than Al powder. However, when Al-Si alloy powder is used, it can be solidified into a high-density green compact even if the particle diameter is slightly larger than when Al and Si are used alone. Specifically, the Al powder is 1 to 200 μm, the Si powder is 1 to 100 μm, the Al—Si alloy powder is 1 to 300 μm, the optional additive element powder other than Al and Si is 1 to 100 μm, and the flux component powder. Is preferably in the range of 1 to 100 μm.
[0017]
The green compact is formed by filling the mixed powder into a molding die and pressurizing it. The green compact need only be solidified to the extent that it can be released from the mold even in a fragile state containing many pores and can be handled in the next process. If there is, solidification is possible. Therefore, it is not necessary to perform compaction at high temperature, and cold compaction is also possible. On the other hand, if the compacting temperature is too high, it cannot be released from the mold inner wall by heat fusion. In the Al—Si-based filler material, the upper limit of the compacting temperature is preferably less than 550 ° C., and particularly preferably less than 400 ° C. Moreover, since there is no possibility that the material powder is oxidized in the temperature range, it is not necessary to compact in a non-oxidizing atmosphere, and the powder can be compacted in the air.
[0018]
The green compact released from the molding die is heated and softened, and then subjected to secondary molding such as extrusion to obtain a flux-containing filler material having a required shape. The heating temperature is only required to soften the particles to such an extent that secondary molding is possible, and it is not necessary to completely melt the particles. Therefore, in the case of an Al—Si based filler material, 300 to 575 ° C. is preferable. Heating atmosphere is non-oxidized for the purpose of preventing deterioration of weldability because the powder density is relatively low and contains a large number of pores or when the heating temperature is high, the brazing filler metal component powder tends to oxidize. However, it may be heated in the atmosphere when the green compact density is relatively high or the heating temperature is low and there is no risk of oxidation.
[0019]
In the present invention, the filler material (4) is not supplied from the outside of the joined portion together with the heating of the joined member (2), but the gap between the joined members (2) and (2) assembled before heating ( Since the flux-containing filler material (4) is inserted into 3), the filler material can be added to joints that are difficult to supply from the outside. It is possible to fuse the filler material (4) and suppress weld cracking. In addition, since the filler material (4) contains a flux, the oxide film on the joint surface is removed, and the occurrence of oxide film entrainment, blowholes and pinholes is suppressed, and good welding is achieved. Achieved. In addition, since the flux-containing filler material (4) is heated indirectly via the member to be joined (2), the temperature rises slowly, and only the flux melts prior to the member to be joined (2). Thus, there is no risk of flowing out or evaporating from the joint, and a flux effect can be obtained with certainty.
[0020]
【Example】
Next, specific examples of the metal material welding method of the present invention will be described with reference to the drawings.
[0021]
As shown in FIG. 1, a welding flange (1) was projected from the end side edge as a member to be joined (base material), and an Al alloy hollow extruded material (2) having the composition shown in Table 1 was used. The two extruded materials (2) and (2) having such a shape were assembled so that the flanges (1) of the two materials were in contact with the end face of the mating material. Then, the filler material (4) having the composition shown in Table 1 is not inserted into the gap (3) formed between the flanges (1) and (1) by assembly, or the filler material (4) is not inserted. Then, the type of the heat source (5) was changed from both outer sides of the joint and heated and welded. The welding conditions are as follows.
(Example 1)
By DCSP-TIG, welding was performed under the conditions of an arc current of 170 A, a welding speed of 30 cm / min, and a shielding gas (Ar gas) flow rate of 5 × 10 −3 m 3 / min.
(Example 2)
Welding was performed by the YAG laser method under the conditions of a pulse energy of 30 J, a pulse width of 1.5 ms, a beam spot diameter of 2 mm, and a welding speed of 8 cm / min.
(Example 3)
By the electron beam method, welding was performed under the conditions of an acceleration voltage of 100 kV, a beam current of 5 mA, a beam diameter of 2 mm, and a welding speed of 9 cm / min.
(Example 4)
The plasma arc method was used for welding under the conditions of an arc current of 200 A and a welding speed of 60 cm / min.
(Example 5)
Welding was performed at a welding speed of 20 cm / min by the acetylene gas method.
(Example 6)
By high frequency induction heating method, welding was performed under conditions of an input energy of about 30 kW and a welding speed of 10 cm / min.
(Comparative Example 1)
Welding was performed under the same conditions as in Example 1 except that a filler-free material was used and the flow rate of shielding gas (Ar gas) was 12 × 10 −3 m 3 / min.
(Comparative Example 2)
Welding was performed under the same conditions as in Example 2 except that a filler-free material was used.
(Comparative Example 3)
Welding was performed under the same conditions as in Example 1 except that the filler metal was not used.
(Comparative Example 4)
Welding was performed under the same conditions as in Example 2 except that the filler metal was not used.
[0022]
About the above-mentioned welded product, a tensile test was performed while visually observing the appearance and cracking of the joint. As for the appearance, those having no blowholes or pinholes were judged as “good”, and those having these were designated as “bad”. In addition, the tensile test was conducted until the welded product was broken, and the broken portion was examined. Table 1 shows these results and reprints the outline of each welding method.
[0023]
[Table 1]
Figure 0003720103
[0024]
From the results of Table 1, each embodiment of the present invention enables the addition of a filler material even in a joint shape that cannot be supplied from the outside, and has good appearance quality and no weld cracking. It was confirmed that it could be achieved. Further, when Example 1 and Comparative Example 1 are compared, it is apparent that the oxide film is removed even if the shielding gas flow rate is reduced due to the presence of the flux, so that good welding is possible. Moreover, when Example 2 and Comparative Example 2 were compared, it was also confirmed that the welding quality was improved by the presence of the flux.
[0025]
【The invention's effect】
As described above, the present invention inserts a flux-containing filler material formed of a filler material component and a flux component into a bonding gap formed by assembling a metal member to be bonded, and Since the flux-containing filler material is heated via the melt, the joined member and the flux-containing filler material are fused, and the joined member is joined, so that it is difficult to supply the filler material from the outside. Also with this metal material, welding with a filler material added becomes possible, and the occurrence of weld cracks can be suppressed. In addition, since the filler material to be added contains flux, the flux is also added to the joint together with the filler material, and the oxide film is removed, resulting in a welded product with good appearance quality. can get. Moreover, even when using a heat source that conventionally required a non-oxidizing heating atmosphere due to the addition of flux, welding in the atmosphere or in an atmosphere closer to the atmosphere is possible, and the amount of shielding gas used is reduced. This reduces the welding cost. In addition, when performing welding with TIG, conventionally, it has been necessary to use AC to obtain a cleaning action. However, since the cleaning action is exhibited by the flux of the flux-containing filler material, it is performed using DC. Therefore, there is also an effect that the penetration depth can be increased.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an essential part showing an embodiment of a welding method of a metal material, (A) is a state where a member to be joined and a filler material are assembled, and (B) is a result of heating from both sides of the joint, (C) shows the result of heating from only one side of the joint.
[Explanation of symbols]
2 ... Joined member 4 ... Flux-containing filler material 3 ... Gap

Claims (5)

金属製被接合部材(2)(2)の組み付けにより形成される接合用間隙(3)に、溶加材成分とフラックス成分とにより形成されたフラックス含有溶加材(4)を挿入し、前記被接合部材(2)(2)を介して前記フラックス含有溶加材(4)を加熱して、被接合部材(2)(2)とフラックス含有溶加材(4)とを融合し、完全に一体化させて、被接合部材(2)(2)を接合することを特徴とする金属材の溶接方法。Inserting the flux-containing filler material (4) formed by the filler material component and the flux component into the bonding gap (3) formed by assembling the metal members (2) and (2), The flux-containing filler material (4) is heated through the members to be joined (2) and (2), and the members to be joined (2) and (2) are fused with the flux-containing filler material (4) to completely It is integrated in the welding method of metal materials, which comprises bonding the bonded members (2) (2). 金属製被接合部材(2)(2)がアルミニウムまたはその合金材である請求項1に記載の金属材の溶接方法。  2. The metal welding method according to claim 1, wherein the metal members to be joined (2) (2) are aluminum or an alloy material thereof. 前記フラックス含有溶加材The flux-containing filler material (4)(Four) が溶加材成分粉末とフラックス成分粉末の圧粉体を成形したものである請求項1または2に記載の金属材の溶接方法。The metal material welding method according to claim 1 or 2, wherein the green compact is formed of a green compact of a filler component powder and a flux component powder. フラックス成分として、一般式;KαAlFα +3 (αは1以上の整数)で表されるKA4、K2AlF5およびK3AlF6、KFとAlF3との混合物または共晶組成物、フルオロアルミン酸カリウム錯体等の弗化物系フラックスを用いる請求項2または3に記載の金属材の溶接方法。As a flux component, KA l F 4 , K 2 AlF 5 and K 3 AlF 6 represented by the general formula; KαAlFα +3 (α is an integer of 1 or more), a mixture or eutectic composition of KF and AlF 3 , The metal material welding method according to claim 2 or 3, wherein a fluoride flux such as potassium fluoroaluminate complex is used. 請求項1ないし4のいずれかに記載の金属材の溶接方法を用いて溶接された溶接品。  A welded product welded using the metal material welding method according to claim 1.
JP31647895A 1995-12-05 1995-12-05 Metal material welding method and welded product Expired - Fee Related JP3720103B2 (en)

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