JP5449110B2 - Solid wire for Ar-CO2 mixed gas shielded arc welding - Google Patents
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本発明は、６９０Ｎ／ｍｍ2級以上の高張力鋼の溶接に用いるＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤに関し、生産性が良好で、特に多層盛溶接で溶接金属の強度および安定した低温靭性が確保でき、かつ、スパッタ発生量が極めて少ないなど良好な溶接作業性が得られるＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤに係わるものである。 The present invention relates to a solid wire for arc-CO 2 mixed gas shielded arc welding used for welding high-strength steel of 690 N / mm 2 class or higher, and has good productivity, and particularly, the strength and stability of the weld metal in multi-layer welding. The present invention relates to a solid wire for Ar—CO 2 mixed gas shielded arc welding that can secure low-temperature toughness and can achieve good welding workability such as extremely low spatter generation.
近年、自動車分野、鉄骨・建築分野、産業・建設分野等において、高張力鋼の使用が多くなっている。高張力鋼の使用は、各分野ともに構造物の重量および使用鋼材重量の低減による環境負荷低減を主な目的としている。 In recent years, high-strength steel is increasingly used in the automobile field, steel frame / architecture field, industry / construction field, and the like. The use of high-strength steel is mainly aimed at reducing the environmental load by reducing the weight of the structure and the weight of steel used in each field.
高張力鋼のガスシールドアーク溶接は、シールドガスとしてＣＯ2ガスを用いる場合と、Ａｒ−ＣＯ2混合ガス（ＣＯ2：５〜２５％）を用いる場合とがある。シールドガスにＣＯ2ガスを用いた場合は、スパッタ発生量が多くなり母材鋼板表面へ付着して、またスラグ生成量が多くなりこれらの除去作業のために溶接能率を著しく損なうことになる。 Gas shield arc welding of high-strength steel has a case where CO 2 gas is used as a shield gas and a case where an Ar—CO 2 mixed gas (CO 2 : 5 to 25%) is used. When CO 2 gas is used as the shielding gas, the amount of spatter generated increases and adheres to the surface of the base steel plate, and the amount of slag generated increases, which significantly impairs the welding efficiency due to these removal operations.
スパッタ発生量およびスラグ生成量を格段に低減するためにはＡｒ−ＣＯ2混合ガス（ＣＯ2：５〜２５％）を用いることが有効である。従来からＡｒ−ＣＯ2混合ガスを用いて高張力鋼の溶接を行う溶接用ソリッドワイヤが多く使用されている。例えば、特許文献１や特許文献２に、薄鋼板の付き合せ溶接や重ねすみ肉溶接に用いる溶接用ソリッドワイヤの提案がある。しかし、特許文献１および特許文献２に記載の溶接用ソリッドワイヤで多層盛溶接すると引張強さが不足したり、靭性が十分得られないという問題があった。 In order to significantly reduce the amount of spatter generated and the amount of slag generated, it is effective to use an Ar—CO 2 mixed gas (CO 2 : 5 to 25%). Conventionally, many welding solid wires for welding high-strength steel using Ar—CO 2 mixed gas have been used. For example, Patent Document 1 and Patent Document 2 propose a solid wire for welding used for butt welding of thin steel plates and lap fillet welding. However, when the multi-layer welding is performed with the solid wires for welding described in Patent Document 1 and Patent Document 2, there is a problem that the tensile strength is insufficient or sufficient toughness cannot be obtained.
また、特許文献３や特許文献４には、Ａｒ−ＣＯ2混合ガスを用いて高張力鋼を多層盛溶接する技術の開示がある。しかし、特許文献３および特許文献４に記載の溶接用ソリッドワイヤは、ＮｉおよびＣｒを含んでいるのでワイヤ自体が高強度となり、ワイヤ製造の伸線加工時に、加工硬化が加わりさらにワイヤが硬化する。ワイヤが硬化するとダイス磨耗や断線が多くなるので製造が困難となる。そこで、伸線途中で熱処理を行いワイヤの硬さを低下させるが、ＮｉやＣｒを含むとワイヤの変態温度が低下するので、焼きなまし処理で軟化を行う場合は、高強度の組織に変態しやすい。したがって、硬化したワイヤを軟化するためには熱処理温度を低下して長時間の保持や除冷が必要となり、生産性が非常に悪いという問題があった。 Further, Patent Document 3 and Patent Document 4 disclose a technique for performing multi-layer welding of high-strength steel using Ar—CO 2 mixed gas. However, since the welding solid wire described in Patent Document 3 and Patent Document 4 contains Ni and Cr, the wire itself has high strength, and work hardening is added and the wire is further hardened during wire drawing in wire manufacturing. . When the wire is cured, die wear and wire breakage increase, making manufacturing difficult. Therefore, heat treatment is performed in the middle of wire drawing to reduce the hardness of the wire, but if Ni or Cr is included, the transformation temperature of the wire is lowered. . Therefore, in order to soften the hardened wire, it is necessary to lower the heat treatment temperature and to maintain it for a long time or to cool it down, resulting in a problem that productivity is very poor.
本発明は、上記問題点に鑑み、６９０Ｎ／ｍｍ2級以上の高張力鋼用ガスシールドアーク溶接用ソリッドワイヤの生産性が良好で、特に多層盛溶接で溶接金属の強度および安定した低温靭性が確保でき、かつ、スパッタ発生量およびスラグ生成量が極めて少ないなど良好な溶接作業性が得られるＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤを提供することを目的とする。 In view of the above problems, the present invention has a good productivity of solid wire for gas shielded arc welding for high strength steel of 690 N / mm 2 grade or higher, especially the strength of weld metal and stable low temperature toughness in multi-layer welding. An object of the present invention is to provide a solid wire for Ar—CO 2 mixed gas shielded arc welding which can be ensured and can provide good welding workability such as an extremely small amount of spatter generation and slag generation.
本発明者らは、上記課題を解決するために、生産性が良好で、特に多層盛溶接で溶接金属の強度および安定した低温靭性が得られ、かつ、スパッタ発生量およびスラグ生成量が少ない６９０Ｎ／ｍｍ2級以上の高張力鋼の溶接に用いるＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤを開発すべく、種々の成分組成のソリッドワイヤを試作して研究した。 In order to solve the above-mentioned problems, the present inventors have good productivity, in particular, the weld metal strength and stable low temperature toughness can be obtained by multi-layer welding, and the amount of spatter generation and slag generation is small. In order to develop a solid wire for Ar-CO 2 mixed gas shielded arc welding used for welding high-strength steels of 2 mm / mm 2 or higher, we made and studied solid wires with various component compositions.
その結果、ＮｉおよびＣｒの含有量を制限し、また、ＶおよびＮｂの含有量も制限し、そして、Ｓｉ、Ｍｎ、ＭｏおよびＣｕを適量含有させることによって多層盛溶接における溶接金属の強度を確保しつつ、ワイヤ製造の伸線時においても断線がなく生産性が良好で、Ｍｎ、ＴｉおよびＢを適量含有させるとともにＰ、ＳおよびＮを低減することによって多層盛溶接における溶接金属の低温靭性が安定し、Ａｌを適量含有させることによってアークが安定しスパッタ発生量が少なく、Ｓｉ、ＭｎおよびＴｉを適量含有させることによって溶接金属の強度および靭性を確保しつつスラグ生成量が少なくなることを見出し、本発明を完成した。 As a result, the content of Ni and Cr is limited, the content of V and Nb is also limited, and the strength of weld metal in multilayer welding is ensured by containing appropriate amounts of Si, Mn, Mo and Cu. However, there is no disconnection even at the time of wire production, and the productivity is good. By containing an appropriate amount of Mn, Ti and B, and reducing P, S and N, the low temperature toughness of the weld metal in multi-layer welding is achieved. It has been found that by containing an appropriate amount of Al, the arc is stabilized and the amount of spatter generated is small, and by adding Si, Mn and Ti in appropriate amounts, the amount of slag is reduced while ensuring the strength and toughness of the weld metal. The present invention has been completed.
本発明の要旨は、（１）ＣＯ2を５〜２５％含むＡｒガスを用いて６９０Ｎ／ｍｍ2以上の高張力鋼を溶接するＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤにおいて、質量％で、Ｃ：０．０２〜０．０８％、Ｓｉ：０．６５〜１．１０％、Ｍｎ：１．８０〜２．２０％、ただし、Ｓｉ＋Ｍｎ：２．５５〜３．１５％、Ｍｏ：０．１０〜０．３０％、Ｃｕ：０．１５〜０．４０％、Ｔｉ：０．０５〜０．１６％、Ｂ：０．００１０〜０．００６０％、Ａｌ：０．００５〜０．０２％、Ｎ：０．００６０％以下、ＶおよびＮｂの１種で又は２種の合計を０．００４〜０．１５％を含有し、残部はＦｅおよび不可避不純物であることを特徴とするＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤにある。
The gist of the present invention is as follows: (1) In an Ar—CO 2 mixed gas shielded arc welding solid wire for welding high-strength steel of 690 N / mm 2 or more using Ar gas containing 5 to 25% of CO 2 , C: 0.02 to 0.08%, Si: 0.65 to 1.10%, Mn: 1.80 to 2.20%, but Si + Mn: 2.55 to 3.15%, Mo: 0.10-0.30%, Cu: 0.15-0.40%, Ti: 0.05-0.16%, B: 0.0010-0.0060%, Al: 0.005-0. 02%, N: 0.0060% or less , one of V and Nb or a total of two contains 0.004 to 0.15% , the balance being Fe and inevitable impurities in -CO 2 mixed gas shielded arc welding solid wires.
また、（２）さらに、質量％で、ＮｉおよびＣｒの１種又は２種の合計を０．１５％以下にしたことも特徴とするＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤにある。 Further, (2) the solid wire for Ar—CO 2 mixed gas shielded arc welding is characterized in that the total of one or two of Ni and Cr is 0.15% or less by mass%.
本発明のＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤによれば、６９０Ｎ／ｍｍ2級以上の高張力鋼用ガスシールドアーク溶接用ソリッドワイヤの生産性が良好で、特に多層盛溶接で溶接金属の強度および安定した低温靭性が確保でき、かつ、スパッタ発生量およびスラグ生成量が極めて少ないなど良好な溶接作業性が得られるので、経済的で溶接能率の向上および溶接部の品質向上が図れる。 According to the solid wire for Ar—CO 2 mixed gas shielded arc welding of the present invention, the productivity of the solid wire for gas shielded arc welding for high-strength steel of 690 N / mm 2 class or higher is good. The metal strength and stable low-temperature toughness can be ensured, and good welding workability such as very little spatter generation and slag generation can be obtained, so it is economical and can improve welding efficiency and weld quality. .
本発明者らは、生産性が良好で、特に多層盛溶接で溶接金属の強度および安定した低温靭性が得られ、かつ、スパッタ発生量およびスラグ生成量が少ない６９０Ｎ／ｍｍ2級以上の高張力鋼の溶接に用いるＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤとして、ＮｉおよびＣｒの含有量、並びにＶおよびＮｂの含有量を制限して、Ｓｉ、Ｍｎ、ＭｏおよびＣｕを適量含有させることによって多層盛溶接における溶接金属の強度を確保しつつ、ワイヤ製造の伸線時においても断線がなく生産性が良好で、Ｍｎ、ＴｉおよびＢを適量含有させるとともにＰ、ＳおよびＮを低減することによって多層盛溶接における溶接金属の低温靭性が安定し、Ａｌを適量含有させることによってアークが安定しスパッタ発生量が少なく、Ｓｉ、ＭｎおよびＴｉを適量含有させることによって溶接金属の強度および靭性を確保しつつスラグ生成量が少なくなることを見出し、Ａｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤの成分設計を行った。 The inventors of the present invention have high productivity, particularly high strength of 690 N / mm 2 class or higher, in which weld metal strength and stable low-temperature toughness can be obtained by multi-layer welding, and spatter generation and slag generation are small. As a solid wire for Ar—CO 2 mixed gas shielded arc welding used for steel welding, the content of Ni and Cr, and the content of V and Nb are limited to contain appropriate amounts of Si, Mn, Mo and Cu. While ensuring the strength of the weld metal in multi-layer welding, there is no disconnection even during wire production, productivity is good, Mn, Ti and B are contained in appropriate amounts, and P, S and N are reduced This stabilizes the low temperature toughness of the weld metal in multi-layer welding, and by containing an appropriate amount of Al, the arc is stabilized and the amount of spatter generated is small. It was found that by containing an appropriate amount of Ti and Ti, the amount of slag generation was reduced while ensuring the strength and toughness of the weld metal, and the composition of the solid wire for Ar—CO 2 mixed gas shielded arc welding was designed.
以下、本発明のＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤに含有される成分組成の限定理由について説明する。以下成分についての「％」は「質量％」である。 Hereinafter, the reason for limitation of the component composition contained in the solid wire for Ar—CO 2 mixed gas shielded arc welding of the present invention will be described. “%” For the following components is “% by mass”.
Ｃ：０．０２〜０．０８％
Ｃは、溶接金属の焼入れ性を高め、強度および靭性を確保するうえで重要な元素である。Ｃが０．０２％未満であると、６９０Ｎ／ｍｍ2以上の強度が得られず靭性も低くなる。一方、Ｃが０．０８％を超えると、溶接金属の割れ感受性が高くなる。したがって、Ｃは０．０２〜０．０８％とする。
C: 0.02 to 0.08%
C is an important element for enhancing the hardenability of the weld metal and ensuring strength and toughness. If C is less than 0.02%, a strength of 690 N / mm 2 or more cannot be obtained and the toughness is also lowered. On the other hand, if C exceeds 0.08%, the cracking sensitivity of the weld metal increases. Therefore, C is 0.02 to 0.08%.
Ｓｉ：０．６５〜１．１０％
Ｓｉは、主要な脱酸剤で溶接金属の酸素量を低減して靭性を向上する。また、ワイヤ製造時の断線を招くことなく溶接金属の強度を確保するのに重要な元素である。Ｓｉが０．６５％未満であると、６９０Ｎ／ｍｍ2以上の強度が得られず靭性も低くなる。一方、１．１０％を超えると、ワイヤ製造時に断線が生じやすくなる。また、溶接金属の靭性が低下する。したがって、Ｓｉは０．６５〜１．１０％とする。
Si: 0.65 to 1.10%
Si is a main deoxidizer and reduces the oxygen content of the weld metal to improve toughness. Moreover, it is an important element for ensuring the strength of the weld metal without causing breakage during wire production. If Si is less than 0.65%, a strength of 690 N / mm 2 or more cannot be obtained, and the toughness is also lowered. On the other hand, if it exceeds 1.10%, disconnection is likely to occur during wire production. In addition, the toughness of the weld metal decreases. Therefore, Si is made 0.65 to 1.10%.
Ｍｎ：１．８０〜２．２０％
Ｍｎは、溶接金属の焼入れ性を高め、強度および靭性を向上する。Ｍｎが１．８０％未満であると、６９０Ｎ／ｍｍ2以上の強度が得られず靭性も低くなる。一方、２．２０％を超えると、ワイヤ製造時に断線が生じやすくなる。また、溶接金属の強度が高くなりすぎて靭性が低下する。したがって、Ｍｎは１．８０〜２．２０％とする。
Mn: 1.80 to 2.20%
Mn increases the hardenability of the weld metal and improves the strength and toughness. When Mn is less than 1.80%, a strength of 690 N / mm 2 or more cannot be obtained, and the toughness is also lowered. On the other hand, if it exceeds 2.20%, disconnection is likely to occur during wire production. Moreover, the strength of the weld metal becomes too high and the toughness is lowered. Therefore, Mn is 1.80 to 2.20%.
Ｓｉ＋Ｍｎ：２．５５〜３．１５％
さらに、上記ＳｉとＭｎは、強度、靭性を向上させる効果を有する元素であるが、両者の合計量によっても強度、靭性に影響を与える。このため、Ｓｉ＋Ｍｎで２．５５〜３．１５％とする。Ｓｉ＋Ｍｎが２．５５％未満であると、６９０Ｎ／ｍｍ2以上の強度が得られず靭性も低くなる。一方、３．１５％を超えると、ワイヤ製造時に断線が生じやすくなる。また、溶接金属の強度が高くなりすぎて靭性が低下する。さらに、Ａｒ−ＣＯ2混合ガスをシールドガスとしても多層盛溶接するとスラグ生成量が多くなりスラグ除去作業が必要になる。
Si + Mn: 2.55 to 3.15%
Further, Si and Mn are elements having an effect of improving strength and toughness, but the total amount of both affects strength and toughness. For this reason, it is made into 2.55 to 3.15% by Si + Mn. When Si + Mn is less than 2.55%, a strength of 690 N / mm 2 or more cannot be obtained and the toughness is also lowered. On the other hand, if it exceeds 3.15%, disconnection is likely to occur during wire production. Moreover, the strength of the weld metal becomes too high and the toughness is lowered. Furthermore, even when Ar—CO 2 mixed gas is used as a shielding gas, when multi-layer welding is performed, the amount of slag generated increases and slag removal work is required.
Ｍｏ：０．１０〜０．３０％
Ｍｏは、溶接金属の強度を確保する。Ｍｏが０．１０％未満であると、溶接金属の強度が６９０Ｎ／ｍｍ2以下となる。一方、０．３０％を超えると、ワイヤ製造時に断線が生じやすくなる。また、溶接金属の強度が高くなりすぎて靭性が低下する。したがって、Ｍｏは０．１０〜０．３０％とする。
Mo: 0.10 to 0.30%
Mo secures the strength of the weld metal. When Mo is less than 0.10%, the strength of the weld metal is 690 N / mm 2 or less. On the other hand, if it exceeds 0.30%, disconnection is likely to occur during wire production. Moreover, the strength of the weld metal becomes too high and the toughness is lowered. Therefore, Mo is set to 0.10 to 0.30%.
Ｃｕ：０．１５〜０．４０％
ＣｕもＭｏと同様に、溶接金属の強度を確保する。また、Ｃｕはワイヤ表面に防錆、通電性およびワイヤ送給性のために施した銅めっきのＣｕ分を主とすることによって、溶接時の通電性およびワイヤ送給性を良好にしてアークを安定にする。Ｃｕが０．１５％未満であると、溶接金属の強度が６９０Ｎ／ｍｍ2以下となる。また、必然的に銅めっき厚さが薄くなり通電性およびワイヤの送給性が不良となってスパッタ発生量が多くなる。一方、０．４０％を超えると、ワイヤ製造時に断線が生じやすくなる。また、溶接金属の強度が高くなりすぎて靭性が低下する。したがって、Ｃｕは０．１５〜０．４０％とする。
Cu: 0.15-0.40%
Cu, like Mo, ensures the strength of the weld metal. In addition, Cu is mainly used for the copper portion of the copper plating applied to the surface of the wire for rust prevention, electrical conductivity and wire feedability, thereby improving the electrical conductivity and wire feedability during welding. Make it stable. When Cu is less than 0.15%, the strength of the weld metal is 690 N / mm 2 or less. In addition, the copper plating thickness is inevitably reduced, and the electrical conductivity and wire feedability are poor, resulting in an increase in the amount of spatter generated. On the other hand, if it exceeds 0.40%, disconnection is likely to occur during wire manufacturing. Moreover, the strength of the weld metal becomes too high and the toughness is lowered. Therefore, Cu is 0.15 to 0.40%.
Ｔｉ：０．０５〜０．１６％
Ｔｉは、強脱酸剤であり、溶接金属のミクロ組織を微細化して靭性を向上させる。また、アークを安定にする効果も有する。Ｔｉが０．０５％未満では靭性が低くなり、アークが不安定でスパッタ発生量もやや多くなる。一方、０．１６％を超えると、スパッタ発生量が多くなる。また、多層盛溶接するとスラグ生成量が多くなりスラグ除去作業が必要になる。したがって、Ｔｉは０．０５〜０．１６％とする。
Ti: 0.05 to 0.16%
Ti is a strong deoxidizer and refines the microstructure of the weld metal to improve toughness. It also has the effect of stabilizing the arc. If Ti is less than 0.05%, the toughness is lowered, the arc is unstable, and the amount of spatter generated is slightly increased. On the other hand, if it exceeds 0.16%, the amount of spatter generated increases. In addition, when multi-layer welding is performed, the amount of slag generated increases and slag removal work is required. Therefore, Ti is set to 0.05 to 0.16%.
Ｂ：０．００１０〜０．００６０％
Ｂは、Ｔｉとの相乗効果により溶接金属の組織を改善して靭性を安定して向上させる。Ｂが０．００１０％未満では、安定した靭性が得られない。一方、０．００６０％を超えると、溶接割れ感受性が高くなり高温割れが生じ安くなる。したがって、Ｂは０．００１０〜０．００６０％とする。
B: 0.0010 to 0.0060%
B improves the structure of the weld metal by a synergistic effect with Ti and stably improves toughness. If B is less than 0.0010%, stable toughness cannot be obtained. On the other hand, if it exceeds 0.0060%, the weld cracking sensitivity becomes high and hot cracking occurs and becomes cheaper. Therefore, B is 0.0010 to 0.0060%.
Ａｌ：０．００５〜０．０２％
Ａｌは、微量でアーク安定剤として作用する。Ａｌが０．００５％未満であると、アークが不安定となってスパッタ発生量が多くなる。一方、０．０２％を超えると、溶滴の粘性を高めて溶滴の離脱を不連続にしてアークが不安定になりスパッタ発生量が多くなる。
Al: 0.005 to 0.02%
Al acts as an arc stabilizer in a trace amount. If Al is less than 0.005%, the arc becomes unstable and the amount of spatter generated increases. On the other hand, if it exceeds 0.02%, the viscosity of the droplet is increased, the separation of the droplet is discontinuous, the arc becomes unstable, and the amount of spatter generated increases.
Ｎ：０．００６０％以下
溶接金属の靭性を安定して向上させるには、Ｎの低減が必須条件となるが、その限界量は０．００６０％以下である。
N: 0.0060% or less In order to stably improve the toughness of the weld metal, reduction of N is an essential condition, but the limit amount is 0.0060% or less.
ＮｉおよびＣｒの１種または２種の合計：０．１５％以下
ＮｉおよびＣｒは、溶接金属の強度を向上するが、ワイヤ自体が高強度となり、ワイヤ製造の伸線加工時にダイス磨耗や断線が多くなるので製造が困難となる。したがって、ＮｉおよびＣｒの１種または２種の合計は０．１５％以下とする。なお、下限は特に限定しなくても本発明の効果を損なうものではないが、ＮｉおよびＣｒの１種または２種の合計は０．０１％を下限とすることが好ましい。
Total of one or two of Ni and Cr: 0.15% or less Ni and Cr improve the strength of the weld metal, but the wire itself has high strength, and die wear and disconnection occur during wire manufacturing. Since it increases, manufacturing becomes difficult. Therefore, the total of one or two of Ni and Cr is 0.15% or less. Although the lower limit is not particularly limited, the effect of the present invention is not impaired, but the total of one or two of Ni and Cr is preferably 0.01%.
なお、不可避不純物中のＰおよびＳは、溶接金属の割れ感受性を高め、靭性を低下させる元素であるので、それぞれ０．０２０％以下とすることが好ましい。 In addition, since P and S in an inevitable impurity are elements which raise the crack sensitivity of a weld metal and reduce toughness, it is preferable to make each 0.020% or less.
また、ＶおよびＮｂは、Ｔｉを添加するときに付随的に含有される成分であり、ＮｉやＣｒと同様に溶接金属の強度を向上するが、ワイヤ自体が高強度となり、ワイヤ製造の伸線加工時にダイス磨耗や断線が多くなるので製造が困難となる。したがって、ＶおよびＮｂはできるだけ少なくすることが好ましく、ＶとＮｂの１種または２種の合計量の下限を実施例に示す０．００４%に限定する。そして、ＶとＮｂの１種または２種の合計量で０．０５％以下、好ましくは０．０２％以下に制限する。
V and Nb are components that are incidentally added when Ti is added, and improve the strength of the weld metal in the same way as Ni and Cr, but the wire itself has high strength, and the wire is drawn for wire production. Manufacture becomes difficult due to increased die wear and disconnection during processing. Therefore, it is preferable to reduce V and Nb as much as possible , and the lower limit of the total amount of one or two of V and Nb is limited to 0.004% shown in the examples. Then, 0.05% by one or two of the total amount of V and Nb or less, preferably limited to 0.02% or less.
本発明におけるガスシールドアーク溶接用ワイヤは、Ａｒを主体としてＣＯ2を５〜２５％混合したＡｒ−ＣＯ2混合ガスを用いて溶接する。混合ガス中のＣＯ2が５％未満であると、溶接金属にブローホールが生じる。一方、２５％を超えると、溶滴が大粒化してアークが不安定になりスパッタ発生量が多くなる。また、スラグ生成量が多くなり作業能率が悪くなる。 The gas shielded arc welding wire in the present invention is welded using an Ar—CO 2 mixed gas in which 5 to 25% of CO 2 is mixed mainly with Ar. When CO 2 in the mixed gas is less than 5%, blowholes are formed in the weld metal. On the other hand, if it exceeds 25%, the droplets become large and the arc becomes unstable and the amount of spatter generated increases. Moreover, the amount of slag generation increases and work efficiency deteriorates.
原料鋼を溶解し、鍛造、５．５ｍｍ径まで圧延、３．０ｍｍまで一次伸線し、７００℃で焼鈍、酸洗そして銅めっきした後、１．２ｍｍ径まで仕上げ伸線して２０ｋｇ巻きのスプール巻ワイヤとした。表１に試作した各種ワイヤの化学成分を示す。なお、表１に記載の化学成分以外は、Ｆｅおよび不可避不純物である。 Melting raw steel, forging, rolling to 5.5mm diameter, primary drawing to 3.0mm, annealing at 700 ° C, pickling and copper plating, then finishing drawing to 1.2mm diameter and winding 20kg A spool winding wire was used. Table 1 shows the chemical components of various types of wires that were prototyped. In addition, it is Fe and an inevitable impurity other than the chemical component of Table 1.
表１に示す各種成分の試作ワイヤは、ワイヤ表面に銅めっきを施した後、各３０００ｋｇ仕上げ伸線して断線の回数を調査した。 The test wires of various components shown in Table 1 were subjected to copper plating on the wire surface, and then each 3000 kg finish wire was drawn and the number of breaks was investigated.
溶接試験は、表２に示す溶接条件で、ＪＩＳ Ｇ３１２８ ＳＨＹ６８５に規定される鋼板を用いてＪＩＳ Ｚ３３１２に準拠して溶着金属試験を行った。 The welding test was a welding metal test in accordance with JIS Z3312, using a steel sheet specified in JIS G3128 SHY685 under the welding conditions shown in Table 2.
溶接作業性は、溶着金属試験の多層盛溶接時にアークの安定性、スラグ生成量および割れの有無を調べた。スラグ生成量は目視で行い最終層までスラグを除去せずに溶接できたものを少ないとした。 Welding workability was examined for arc stability, slag generation amount, and cracks during multi-layer welding in the weld metal test. The amount of slag produced was visually observed, and the amount that could be welded to the final layer without removing the slag was assumed to be small.
スパッタ発生量は、溶着金属試験とは別に銅製の補修箱を用いて、ビードオンプレート溶接により表２の溶接条件で３回（１回の溶接時間１．５ｍｉｎ）して捕集した。スパッタ発生量は１ｇ／ｍｉｎ以下を良好とした。 The spatter generation amount was collected by using a copper repair box separately from the weld metal test and performing bead-on-plate welding three times under the welding conditions shown in Table 2 (one welding time 1.5 min). The amount of spatter generated was good at 1 g / min or less.
溶接金属の評価は、引張強さが６９０〜８３０Ｎ／ｍｍ2を合格とし、靭性は−２０℃で各５本衝撃試験を行い、吸収エネルギーの最小値が７０Ｊ以上を合格とした。それらの結果を表３にまとめて示す。 As for the evaluation of the weld metal, a tensile strength of 690 to 830 N / mm 2 was accepted, and a toughness of each was subjected to an impact test at −20 ° C., and a minimum value of absorbed energy was 70 J or more. The results are summarized in Table 3.
表１および表３中、ワイヤＮｏ．１〜６が本発明例、ワイヤＮｏ．７〜２０は比較例である。
In Table 1 and Table 3, the wire No. 1 to 6 are examples of the present invention, wire Nos. 7 to 20 are comparative examples.
本発明例であるワイヤＮｏ．１〜６は、ワイヤ成分が適正であるので、伸線時に断線がなく生産性が良好で、アークが安定してスパッタの発生量およびスラグ生成量が少なく、割れも生じず、溶接金属の強度および吸収エネルギーともに良好な値が得られるなど、極めて満足な結果であった。
Wire No. which is an example of the present invention. In Nos. 1 to 6 , since the wire component is appropriate, there is no disconnection at the time of wire drawing, the productivity is good, the arc is stable, the amount of spatter generation and slag generation is small, no cracks occur, and the strength of the weld metal The results were extremely satisfactory, such as good values for both the absorbed energy and the absorption energy.
比較例中、ワイヤＮｏ．７は、Cが低いので、溶接金属の強度および吸収エネルギーが低値であった。また、Bが高いので、クレータに割れが生じた。
In the comparative examples, the wire No. In No. 7 , since C was low, the strength and absorbed energy of the weld metal were low. Moreover, since B was high, the crater was cracked.
ワイヤＮｏ．８は、Cが高いので、クレータに割れが生じた。また、Bが低いので、吸収エネルギーの最低値が低かった。
Wire No. Since No. 8 had high C, the crater cracked. Moreover, since B was low, the minimum value of absorbed energy was low.
ワイヤＮｏ．９は、Ｓｉが低いので、溶接金属の強度および吸収エネルギーが低値であった。また、Ａｌが低いので、アークが不安定でスパッタ発生量が多かった。
Wire No. Since No. 9 had low Si, the strength and absorbed energy of the weld metal were low. Moreover, since Al was low, the arc was unstable and the amount of spatter generated was large.
ワイヤＮｏ．１０は、Ｓｉが高いので、伸線時に断線が生じ、溶接金属の吸収エネルギーも低値であった。また、Ａｌが高いので、アークが不安定でスパッタ発生量が多かった。
Wire No. No. 10 was high in Si, so disconnection occurred during wire drawing, and the absorbed energy of the weld metal was also low. Further, since Al is high, the arc is unstable and the amount of spatter generated is large.
ワイヤＮｏ．１１はＭｎが低いので、ワイヤＮｏ．１３はＳｉ＋Ｍｎが低いので、いずれも溶接金属の強度および吸収エネルギーが低値であった。
Wire No. No. 11 has a low Mn. Since No. 13 had a low Si + Mn, the strength and absorbed energy of the weld metal were both low.
ワイヤＮｏ．１２はＭｎが高いので、ワイヤＮｏ．１６はＭｏが高いので、ワイヤＮｏ．１８はＣｕが高いので、いずれも伸線時に断線が生じ、溶接金属の強度が高く吸収エネルギーは低値であった。
Wire No. No. 12 has a high Mn. No. 16 has a high Mo. Since No. 18 is high in Cu, breakage occurred at the time of wire drawing, the strength of the weld metal was high, and the absorbed energy was low.
ワイヤＮｏ．１４は、Ｓｉ＋Ｍｎが高いので、伸線時に断線が生じ、溶接時にスラグ生成量も多かった。また、溶接金属の強度が高く吸収エネルギーは低値であった。
Wire No. No. 14 had high Si + Mn, so breakage occurred during wire drawing, and a large amount of slag was produced during welding. Moreover, the strength of the weld metal was high and the absorbed energy was low.
ワイヤＮｏ．１５は、Ｍｏが低いので、溶接金属の強度が低かった。また、Ｔｉが多いので、スパッタ発生量およびスラグ生成量が多かった。
Wire No. No. 15 had low Mo, so the strength of the weld metal was low. In addition, since Ti is large, the amount of spatter generation and slag generation was large.
ワイヤＮｏ．１７は、Ｃｕが低いので、アークがやや不安定でスパッタ発生量が多かった。また、溶接金属の強度が低かった。
Wire No. In No. 17 , since Cu was low, the arc was slightly unstable and the amount of spatter was large. Moreover, the strength of the weld metal was low.
ワイヤＮｏ．１９は、ＮｉとＣｒの合計が高いので、伸線時に断線が生じた。また、Ｔｉが低いので、アークがやや不安定でスパッタ発生量がやや多く、溶接金属の吸収エネルギーも低値であった。
Wire No. No. 19 had a high sum of Ni and Cr, and thus disconnection occurred during wire drawing. Further, since Ti is low, the arc is somewhat unstable, the amount of spatter generated is somewhat large, and the absorbed energy of the weld metal is also low.
ワイヤＮｏ．２０は、Ｎが高いので、吸収エネルギーの最低値が低かった。 Wire No. No. 20 had a low N value because the N value was high.
以上具体例に基づいて説明したように、本発明の要件を満たすＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤによれば、伸線性が良好で、多層盛溶接で溶接金属の６９０Ｎ／ｍｍ2級以上の強度および安定した低温靭性が確保でき、かつ、スパッタ発生量およびスラグ生成量が極めて少ないなどの良好な溶接作業性が得られることがわかる。 As described above based on the specific examples, according to the solid wire for Ar—CO 2 mixed gas shielded arc welding satisfying the requirements of the present invention, the drawability is good, and 690 N / mm 2 of weld metal is obtained by multi-layer welding. It can be seen that good welding workability can be obtained, such as a strength higher than the grade and stable low temperature toughness, and a very small amount of spatter and slag.
Claims (2)
Ｃ ：０．０２〜０．０８％、
Ｓｉ：０．６５〜１．1０％、
Ｍｎ：１．８０〜２．２０％、
ただし、Ｓｉ＋Ｍｎ：２．５５〜３．１５％、
Ｍｏ：０．１０〜０．３０％、
Ｃｕ：０．１５〜０．４０％、
Ｔｉ：０．０５〜０．１６％、
Ｂ ：０．００１０〜０．００６０％、
Ａｌ：０．００５〜０．０２％、
ＶおよびＮｂの１種または２種を合計：０．００４〜０．０５％を含有し、
Ｎ ：０．００６０％以下で、残部はＦｅおよび不可避不純物であることを特徴とするＡｒ−ＣＯ2混合ガスシールドアーク溶接用ソリッドワイヤ。 In Ar-CO 2 mixed gas shielded arc welding solid wires for welding 690n / mm 2 or more high tensile steel using Ar gas containing CO 2 5 to 25%, by mass%,
C: 0.02 to 0.08%,
Si: 0.65 to 1.10%,
Mn: 1.80 to 2.20%
However, Si + Mn: 2.55 to 3.15%,
Mo: 0.10 to 0.30%,
Cu: 0.15-0.40%,
Ti: 0.05 to 0.16%,
B: 0.0010 to 0.0060%,
Al: 0.005 to 0.02%,
One or two of V and Nb in total: 0.004 to 0.05% contained,
N: Solid wire for Ar—CO 2 mixed gas shielded arc welding, characterized in that it is 0.0060% or less and the balance is Fe and inevitable impurities.
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| CN112846564B (en) * | 2020-12-31 | 2024-02-02 | 江苏九洲新材料科技有限公司 | Argon tungsten-arc stainless steel welding wire and preparation method thereof |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
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| LAPS | Cancellation because of no payment of annual fees |