JP2020157315A - Flux cored wire for electro-gas arc welding - Google Patents

Flux cored wire for electro-gas arc welding Download PDF

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JP2020157315A
JP2020157315A JP2019056575A JP2019056575A JP2020157315A JP 2020157315 A JP2020157315 A JP 2020157315A JP 2019056575 A JP2019056575 A JP 2019056575A JP 2019056575 A JP2019056575 A JP 2019056575A JP 2020157315 A JP2020157315 A JP 2020157315A
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weld metal
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JP7244322B2 (en
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笹木 聖人
Masahito Sasaki
聖人 笹木
友勝 岩上
Tomokatsu Iwagami
友勝 岩上
紀文 中尾
Norifumi Nakao
紀文 中尾
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Nippon Steel Welding and Engineering Co Ltd
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Abstract

To provide a flux cored wire for electro-gas arc welding capable of obtaining a weld metal that is good in welding working performance and superior in low-temperature toughness such as arc stabilization in the large heat input 1-pass welding of a steel plate.MEANS: In a flux cored wire for electro-gas arc welding formed by filling flux in a steel sheath, in mass% to the wire total mass, the total of the steel sheath and the flux of C: 0.02-0.10%, Si: 0.3-1.1%, Mn: 1.8-3.3%, Mo: 0.2-0.8%, Ti: 0.05-0.25%, B: 0.004-0.020%, and the total of 1-kind or 2-kinds of Al and Mg: 0.1-0.3% are contained. Further, in mass % to the wire total mass, CaF2: 0.2-0.8%, NaF: 0.1-0.6%, and the total for Fe in the iron powder and for Fe in the iron alloy: 15-25% are contained in the flux. The total of the metal oxide is 0.08% or less.SELECTED DRAWING: None

Description

本発明は、エレクトロガスアーク溶接用フラックス入りワイヤに関し、アークが安定してスパッタ発生量が少なく、機械的性能の優れた溶接金属が得られるエレクトロガスアーク溶接用フラックス入りワイヤに関する。 The present invention relates to a flux-cored wire for electrogas arc welding, and the present invention relates to a flux-cored wire for electrogas arc welding, which can obtain a weld metal having a stable arc, a small amount of spatter, and excellent mechanical performance.

エレクトロガスアーク溶接は、高能率に立向上進溶接ができることから、船舶、石油貯蔵タンク、橋梁等の幅広い分野で適用されている。 Electrogas arc welding is applied in a wide range of fields such as ships, oil storage tanks, and bridges because it can perform vertical improvement welding with high efficiency.

エレクトロガスアーク溶接の概略を図1及び図2に示す。図1は溶接方法の模式図、図2は鋼板の開先形状を示す図である。垂直に立てられた隣り合う2枚の鋼板1の間に、開先10が形成される。開先10の裏側には固定裏当材8を当接し、表側には摺動銅当金11を当て、摺動銅当金11の開先10に対向する溝9と開先10で囲まれた空間に溶接トーチ4を挿入する。そして摺動銅当金11のガス供給ノズル5からシールドガスを供給しながら、溶接トーチ4を介して溶接用ワイヤ3を該空間に連続的に供給する。溶接台車(図示せず)に搭載された摺動銅当金11及び溶接トーチ4は、溶接の進行により上昇する溶接金属6上面に合わせて順次上昇させる。図に示すように、溶接金属6の上部は溶融金属12であり、2枚の鋼板1の間には開先10裏面のルートギャップ2が形成され、摺動銅当金11を冷却するための冷却水供給ノズル7が設けられている。 The outline of electrogas arc welding is shown in FIGS. 1 and 2. FIG. 1 is a schematic view of a welding method, and FIG. 2 is a diagram showing a groove shape of a steel plate. A groove 10 is formed between two adjacent steel plates 1 standing vertically. A fixed backing material 8 is brought into contact with the back side of the groove 10, a sliding copper torch 11 is applied to the front side, and the sliding copper torch 11 is surrounded by a groove 9 and a groove 10 facing the groove 10. The welding torch 4 is inserted into the space. Then, while supplying the shield gas from the gas supply nozzle 5 of the sliding copper deposit 11, the welding wire 3 is continuously supplied to the space via the welding torch 4. The sliding copper allowance 11 and the welding torch 4 mounted on the welding carriage (not shown) are sequentially raised in accordance with the upper surface of the welding metal 6 which is raised as the welding progresses. As shown in the figure, the upper portion of the weld metal 6 is the molten metal 12, and a root gap 2 on the back surface of the groove 10 is formed between the two steel plates 1 to cool the sliding copper equivalent 11. A cooling water supply nozzle 7 is provided.

エレクトロガスアーク溶接は、高能率に立向上進溶接ができる半面、溶融金属12上でアークを維持することから、溶融金属上に多量に溶融スラグが生成する場合、アークが不安定になり、その溶融スラグが飛び散り(以下、スラグ跳ねという。)、開先面、トーチ、シールドガス吹き出し口にスラグが付着して不具合を起こすことがある。 Electrogas arc welding enables high-efficiency vertical welding, but maintains the arc on the molten metal 12. Therefore, when a large amount of molten slag is generated on the molten metal, the arc becomes unstable and melts. Slag may scatter (hereinafter referred to as slag splash), and slag may adhere to the groove surface, torch, and shield gas outlet, causing problems.

このような背景からエレクトロガスアーク溶接は、スラグ跳ねの抑制が要望され、さらに大入熱の溶接となることから、溶接金属の機械的性能、特に低温における靭性の改良が要望されている。 Against this background, electrogas arc welding is required to suppress slag splashing, and further, it is welding with a large amount of heat input. Therefore, improvement in mechanical performance of the weld metal, particularly toughness at low temperature is required.

エレクトロガスアーク溶接で溶接金属の低温靭性を得る技術として、特許文献1に、溶接用フラックス入りワイヤを用い、鋼板の開先をX開先として両面から2層の溶接で溶接入熱を低くする技術の開示がある。しかし、特許文献1に記載の溶接用フラックス入りワイヤを用いて、大入熱で1パス溶接をした場合には、溶接金属の低温靭性が得られないばかりか溶接時にアークが不安定でスパッタ発生量及びスラグ跳ねが多くなるという問題があった。 As a technique for obtaining low temperature toughness of weld metal by electrogas arc welding, Patent Document 1 uses a wire containing flux for welding, and a technique for reducing welding heat input by welding two layers from both sides with the groove of the steel plate as the X groove. There is disclosure of. However, when 1-pass welding is performed with a large heat input using the flux-cored wire for welding described in Patent Document 1, not only the low temperature toughness of the weld metal cannot be obtained, but also the arc is unstable during welding and spatter occurs. There was a problem that the amount and slag bounce increased.

また、エレクトロガスアーク溶接における大入熱の1パス溶接で溶接金属の低温靭性を得る技術として、特許文献2や特許文献3には、Ni、Mo、Ti、B、Mg等を含む溶接用フラックス入りワイヤを用いて板厚60〜70mm鋼板を溶接する技術の開示がある。しかし、特許文献2及び特許文献3に記載の技術においては、溶接金属の靭性は得られるものの、溶接時にアークが不安定でスパッタ発生量及びスラグ跳ねが多くなるという問題があった。 Further, as a technique for obtaining low temperature toughness of a weld metal by one-pass welding with a large heat input in electrogas arc welding, Patent Document 2 and Patent Document 3 contain a welding flux containing Ni, Mo, Ti, B, Mg and the like. There is a disclosure of a technique for welding a steel plate having a thickness of 60 to 70 mm using a wire. However, in the techniques described in Patent Documents 2 and 3, although the toughness of the weld metal can be obtained, there is a problem that the arc is unstable at the time of welding and the amount of spatter generated and the slag bounce increase.

さらに、エレクトロガスアーク溶接において大入熱の1パス溶接で溶接作業性が良好で溶接金属の靭性を得る技術として、特許文献4には、溶接用フラックス入りワイヤ中にNi、Mo(Cr)、Ti、B、Mg、F、K等を適量含有する技術の開示がある。しかし、特許文献4に記載の技術においても、溶接時にアークが不安定でスパッタ発生量及びスラグ跳ねが多くなり、溶接金属の低温靭性も十分ではないという問題があった。 Further, as a technique for obtaining the toughness of a weld metal with good welding workability by one-pass welding with a large heat input in electrogas arc welding, Patent Document 4 describes Ni, Mo (Cr), and Ti in a flux-cored wire for welding. , B, Mg, F, K and the like are disclosed. However, even in the technique described in Patent Document 4, there is a problem that the arc is unstable at the time of welding, the amount of spatter generated and the slag splash increase, and the low temperature toughness of the weld metal is not sufficient.

特開平4−279295号公報Japanese Unexamined Patent Publication No. 4-279295 特開平9−285891号公報Japanese Unexamined Patent Publication No. 9-285891 特開2009−82947号公報JP-A-2009-82947 特開2008−126262号公報Japanese Unexamined Patent Publication No. 2008-126262

そこで本発明は、上述した問題点に鑑みて案出されたものであり、厚鋼板の大入熱1パス溶接において、アークが安定するなど溶接作業性が良好で、低温靭性に優れた溶接金属が得られるエレクトロガスアーク溶接用フラックス入りワイヤを提供することを目的とする。 Therefore, the present invention has been devised in view of the above-mentioned problems, and is a weld metal having good welding workability such as stable arc in large heat input 1-pass welding of a thick steel sheet and excellent low temperature toughness. It is an object of the present invention to provide a flux-cored wire for electrogas arc welding.

本発明の要旨は、鋼製外皮にフラックスを充填してなるエレクトロガスアーク溶接用フラックス入りワイヤにおいて、ワイヤ全質量に対する質量%で、鋼製外皮とフラックスの合計で、C:0.02〜0.10%、Si:0.3〜1.1%、Mn:1.8〜3.3%、Mo:0.2〜0.8%、Ti:0.05〜0.25%、B:0.004〜0.020%、Al及びMgの1種又は2種の合計:0.1〜0.3%を含有し、さらに、ワイヤ全質量に対する質量%で、フラックス中に、CaF2:0.2〜0.8%、NaF:0.1〜0.6%、鉄粉中のFe分及び鉄合金中のFe分の合計:15〜25%を含有し、金属酸化物の合計:0.08%以下であり、残部は鋼製外皮のFe分及び不可避不純物からなることを特徴とするエレクトロガスアーク溶接用フラックス入りワイヤにある。 The gist of the present invention is that in a flux-cored wire for electrogas arc welding in which a steel outer skin is filled with flux, the total mass of the steel outer skin and the flux is C: 0.02 to 0. 10%, Si: 0.3 to 1.1%, Mn: 1.8 to 3.3%, Mo: 0.2 to 0.8%, Ti: 0.05 to 0.25%, B: 0 .004 to 0.020%, total of 1 or 2 types of Al and Mg: 0.1 to 0.3%, and CaF 2 : 0 in flux in% by weight relative to total wire mass. .2 to 0.8%, NaF: 0.1 to 0.6%, total Fe content in iron powder and Fe content in iron alloy: 15 to 25%, total metal oxide: 0 It is in a flux-cored wire for electrogas arc welding, which is .08% or less and the balance is composed of Fe content and unavoidable impurities of a steel outer skin.

本発明のエレクトロガスアーク溶接用フラックス入りワイヤによれば、厚鋼板の大入熱1パス溶接において、アークが安定してスパッタ発生量やスラグ跳ねが少なく、ビード外観が良好であるなど溶接作業性が良好で、低温靭性に優れた溶接金属が得られ、高品質な溶接部を高能率に提供することができる。 According to the flux-cored wire for electrogas arc welding of the present invention, in large heat input 1-pass welding of a thick steel plate, the arc is stable, the amount of spatter generated and the slag bounce are small, and the bead appearance is good. Welded metal with good quality and excellent low temperature toughness can be obtained, and high quality welded parts can be provided with high efficiency.

エレクトロガスアーク溶接の溶接方法の模式図である。It is a schematic diagram of the welding method of electrogas arc welding. 鋼板の開先形状を示す図である。It is a figure which shows the groove shape of a steel plate.

本発明者らは、厚鋼板の大入熱1パス溶接におけるエレクトロガスアーク溶接において、アークが安定してスパッタ発生量やスラグ跳ねが少なく、機械的性能に優れるエレクトロガスアーク溶接用フラックス入りワイヤの成分組成について詳細に検討した。 The present inventors have a component composition of a flux-cored wire for electrogas arc welding, which has a stable arc, a small amount of spatter generation and a small amount of slag splash, and excellent mechanical performance in electrogas arc welding in large heat input 1-pass welding of a thick steel sheet. Was examined in detail.

その結果、アークの安定性は、NaFと鉄粉中のFe分及び鉄合金中のFe分の合計を適量とすることによって良好となる。また、スラグ跳ねの防止は、Si、Mn、CaF2及び鉄粉中のFe分と鉄合金中のFe分の合計を適量とし、金属酸化物の合計を少なくすることによってなし得ることを見出した。ビード外観は、Si、Mn及びNaFを適量とすることによって良好となる。 As a result, the stability of the arc is improved by setting the total of NaF, the Fe content in the iron powder and the Fe content in the iron alloy to an appropriate amount. It was also found that prevention of slag splashing can be achieved by adjusting the total amount of Fe in Si, Mn, CaF 2 and iron powder and Fe in iron alloy to an appropriate amount and reducing the total amount of metal oxides. .. The bead appearance is improved by using appropriate amounts of Si, Mn and NaF.

溶接金属の機械的性能は、C、Si、Mn、Mo、Ti、B、Al、Mg及びCaF2を適量とすることによって、強度及び低温靭性に優れた溶接金属が得られることを見出した。 Regarding the mechanical performance of the weld metal, it was found that a weld metal having excellent strength and low temperature toughness can be obtained by adjusting C, Si, Mn, Mo, Ti, B, Al, Mg and CaF 2 to appropriate amounts.

以下、本発明のエレクトロガスアーク溶接用フラックス入りワイヤの成分組成及びその含有量と、各成分組成の限定理由について説明する。なお、成分組成の含有量は質量%で表すこととし、その質量%を表すときには単に%と記載して表すこととする。 Hereinafter, the component composition and the content thereof of the flux-cored wire for electrogas arc welding of the present invention and the reason for limiting each component composition will be described. The content of the component composition is expressed in% by mass, and when the mass% is expressed, it is simply expressed as%.

[鋼製外皮とフラックスの合計でC:0.02〜0.10%]
Cは、溶接金属の強度を確保する。Cが0.02%未満では、十分な溶接金属の強度が得られない。一方、Cが0.10%を超えると、溶接金属の強度が過剰に高くなって低温靱性が低下する。したがって、鋼製外皮とフラックスの合計でCは0.02〜0.10%とする。なお、Cは、鋼製外皮に含まれる成分の他、フラックスから鉄粉、金属粉及び合金粉等から添加できる。
[C: 0.02 to 0.10% in total of steel outer skin and flux]
C secures the strength of the weld metal. If C is less than 0.02%, sufficient strength of the weld metal cannot be obtained. On the other hand, when C exceeds 0.10%, the strength of the weld metal becomes excessively high and the low temperature toughness decreases. Therefore, the total of the steel outer skin and the flux is set to 0.02 to 0.10%. In addition to the components contained in the steel outer skin, C can be added from flux, iron powder, metal powder, alloy powder, or the like.

[鋼製外皮とフラックスの合計でSi:0.3〜1.1%]
Siは、脱酸剤として作用し、溶接金属の低温靭性を向上させる効果がある。また、Siの酸化によって生成するスラグがビード外観を良好にする効果がある。Siが0.3%未満では、その効果が得られず、溶接金属の低温靭性が低下する。また、溶接時に生成するスラグ量が不足するため、ビード外観が悪くなる。一方、Siが1.1%を超えると、溶接金属中にSiが過剰に歩留まり、溶接金属の強度が高くなり低温靱性が低下する。また、Si酸化物の生成量が多くなって、スラグ跳ねが生じやすくなる。したがって、鋼製外皮とフラックスの合計でSiは0.3〜1.1%とする。なお、Siは、鋼製外皮に含まれる成分の他、フラックスから金属Si、Fe−Si、Fe−Si−Mn等の合金粉末から添加できる。
[Total of steel outer skin and flux Si: 0.3-1.1%]
Si acts as a deoxidizer and has the effect of improving the low temperature toughness of the weld metal. In addition, the slag produced by the oxidation of Si has the effect of improving the bead appearance. If Si is less than 0.3%, the effect cannot be obtained and the low temperature toughness of the weld metal is lowered. In addition, the amount of slag generated during welding is insufficient, resulting in poor bead appearance. On the other hand, when Si exceeds 1.1%, Si is excessively yielded in the weld metal, the strength of the weld metal is increased, and the low temperature toughness is lowered. In addition, the amount of Si oxide produced increases, and slag splashing tends to occur. Therefore, the total of the steel outer skin and the flux is set to 0.3 to 1.1%. In addition to the components contained in the steel outer skin, Si can be added from an alloy powder such as metal Si, Fe-Si, Fe-Si-Mn from flux.

[鋼製外皮とフラックスの合計でMn:1.8〜3.3%]
Mnは、脱酸剤として作用するとともに、溶接金属の強度と低温靱性を向上させる効果がある。また、Mnの酸化によって生じたスラグがビード外観を良好にする効果がある。Mnが1.8%未満では、溶接金属の低温靭性が低下するとともに、十分な強度が得られない。また、溶接時に生成するスラグの量が不足するため、ビード外観が悪くなる。一方、Mnが3.3%を超えると、溶接金属の強度が高くなって低温靱性が低下する。また、スラグの生成量が多くなって、スラグ跳ねが生じやすくなる。したがって、鋼製外皮とフラックスの合計でMnは1.8〜3.3%とする。なお、Mnは、鋼製外皮に含まれる成分の他、フラックスから金属Mn、Fe−Mn、Fe−Si−Mn等の合金粉末から添加できる。
[Mn: 1.8 to 3.3% in total of steel outer skin and flux]
Mn acts as a deoxidizer and has the effect of improving the strength and low temperature toughness of the weld metal. In addition, the slag generated by the oxidation of Mn has the effect of improving the bead appearance. If Mn is less than 1.8%, the low temperature toughness of the weld metal is lowered and sufficient strength cannot be obtained. In addition, the appearance of the bead deteriorates because the amount of slag generated during welding is insufficient. On the other hand, when Mn exceeds 3.3%, the strength of the weld metal increases and the low temperature toughness decreases. In addition, the amount of slag generated increases, and slag bounce is likely to occur. Therefore, the total Mn of the steel outer skin and the flux is set to 1.8 to 3.3%. In addition to the components contained in the steel outer skin, Mn can be added from alloy powders such as metal Mn, Fe-Mn, and Fe-Si-Mn from flux.

[鋼製外皮とフラックスの合計でMo:0.2〜0.8%]
Moは、溶接金属の強度を向上させる。Moが0.2%未満では、溶接金属の強度向上効果は得られない。一方、Moが0.8%を超えると、強度が過剰に上昇し靭性が低下する。したがって、鋼製外皮とフラックスの合計でMoは0.2〜0.8%とする。なお、Moは、鋼製外皮の含まれる成分の他、フラックスから金属Mo、Fe−Mo等の合金粉末から添加できる。
[Total of steel outer skin and flux Mo: 0.2-0.8%]
Mo improves the strength of the weld metal. If Mo is less than 0.2%, the effect of improving the strength of the weld metal cannot be obtained. On the other hand, when Mo exceeds 0.8%, the strength increases excessively and the toughness decreases. Therefore, the total Mo of the steel outer skin and the flux is 0.2 to 0.8%. In addition to the components contained in the steel outer skin, Mo can be added from an alloy powder such as metal Mo or Fe-Mo from flux.

[鋼製外皮とフラックスの合計でTi:0.05〜0.25%]
Tiは、脱酸剤として作用するとともに、生成したTi含有酸化物が溶接金属の組織を微細化して低温靭性を向上させる効果がある。Tiが0.05%未満では、溶接金属の低温靭性を向上する効果が得られない。一方、Tiが0.25%を超えると、靭性を阻害する上部ベイナイト組織を生成し、溶接金属の低温靭性が低下する。したがって、鋼製外皮とフラックスの合計でTiは0.05〜0.25%とする。なお、Tiは、鋼製外皮に含まれる成分の他、フラックスからの金属Ti、Fe−Ti等の合金粉末から添加できる。
[Total of steel outer skin and flux Ti: 0.05-0.25%]
Ti acts as an antacid, and the generated Ti-containing oxide has the effect of refining the structure of the weld metal and improving low-temperature toughness. If Ti is less than 0.05%, the effect of improving the low temperature toughness of the weld metal cannot be obtained. On the other hand, when Ti exceeds 0.25%, an upper bainite structure that inhibits toughness is formed, and the low temperature toughness of the weld metal is lowered. Therefore, the total of the steel outer skin and the flux is set to 0.05 to 0.25%. In addition to the components contained in the steel outer skin, Ti can be added from alloy powders such as metal Ti and Fe-Ti from flux.

[鋼製外皮とフラックスの合計でB:0.004〜0.020%]
Bは、微量の添加で溶接金属の組織を微細化して低温靱性を向上させる効果がある。Bが0.004%未満では、その効果が十分に得られず、溶接金属の低温靭性が低下する。一方、Bが0.020%を超えると、溶接金属の強度が高くなり靭性が低下する。したがって、鋼製外皮とフラックスの合計でBは0.004〜0.020%とする。なお、Bは、鋼製外皮に含まれる成分の他、フラックスからの金属B、Fe−B、Fe−Mn−B等の合金粉末から添加できる。
[Total of steel outer skin and flux B: 0.004 to 0.020%]
B has the effect of improving the low temperature toughness by making the structure of the weld metal finer by adding a small amount. If B is less than 0.004%, the effect is not sufficiently obtained and the low temperature toughness of the weld metal is lowered. On the other hand, when B exceeds 0.020%, the strength of the weld metal increases and the toughness decreases. Therefore, the total of the steel outer skin and the flux is set to 0.004 to 0.020%. In addition to the components contained in the steel outer skin, B can be added from alloy powders such as metal B, Fe-B, and Fe-Mn-B from flux.

[鋼製外皮とフラックスの合計でAl及びMgの1種又は2種の合計:0.1〜0.3%]
Al及びMgは、強脱酸剤として作用して溶接金属中の酸素を低減し、溶接金属の低温靱性を向上させる効果がある。Al及びMgの1種又は2種の合計が0.1%未満では、この効果が十分に得られず、脱酸不足となって溶接金属の低温靱性が低下する。一方、Al及びMgの1種又は2種の合計が0.3%を超えると、Si及びMnの溶接金属への歩留が高くなって溶接金属の強度が高くなり靭性が低下する。また、スラグ跳ねが多くなる。したがって、鋼製外皮とフラックスの合計でAl及びMgの1種又は2種の合計は0.1〜0.3%とする。なお、Al及びMgは、鋼製外皮に含まれる成分の他、フラックスから金属Al、Fe−Al、金属Mg、Al−Mg等の合金粉末から添加できる。
[Total of steel outer skin and flux: Total of 1 or 2 types of Al and Mg: 0.1-0.3%]
Al and Mg have the effect of acting as a strong deoxidizer to reduce oxygen in the weld metal and improve the low temperature toughness of the weld metal. If the total of one or two types of Al and Mg is less than 0.1%, this effect cannot be sufficiently obtained, deoxidation is insufficient, and the low temperature toughness of the weld metal is lowered. On the other hand, when the total of one or two types of Al and Mg exceeds 0.3%, the yield of Si and Mn to the weld metal increases, the strength of the weld metal increases, and the toughness decreases. In addition, slag bounce increases. Therefore, the total of one or two types of Al and Mg is set to 0.1 to 0.3% in the total of the steel outer skin and the flux. In addition to the components contained in the steel outer skin, Al and Mg can be added from an alloy powder such as metal Al, Fe-Al, metal Mg, and Al-Mg from the flux.

[フラックス中のCaF2:0.2〜0.8%]
CaF2は、溶融スラグの塩基度を高くして、溶接金属の酸素量を低減して低温靭性を得る効果がある。CaF2が0.2%未満であると、この効果が得られず、溶接金属の低温靭性が低下する。一方、CaF2が0.8%を超えると、スラグ跳ねが生じやすくなる。したがって、フラックス中のCaF2は0.2〜0.8%とする。なお、CaF2は蛍石から添加する。
[CaF 2 : 0.2 to 0.8% in flux]
CaF 2 has the effect of increasing the basicity of molten slag, reducing the amount of oxygen in the weld metal, and obtaining low temperature toughness. If CaF 2 is less than 0.2%, this effect cannot be obtained and the low temperature toughness of the weld metal is lowered. On the other hand, when CaF 2 exceeds 0.8%, slag bounce is likely to occur. Therefore, CaF 2 in the flux is set to 0.2 to 0.8%. CaF 2 is added from fluorite.

[フラックス中のNaF:0.1〜0.6%]
NaFは、アークを安定にしてスパッタ発生量を少なくする。NaFが0.1%未満であると、この効果が得られずアークが不安定になってスパッタ発生量が多くなる。一方、NaFが0.6%を超えると、スラグの流動性が過大になってスラグが垂れやすくなり良好なビードが得られなくなる。したがって、NaFは0.1〜0.6%とする。
[NaF in flux: 0.1-0.6%]
NaF stabilizes the arc and reduces the amount of spatter generated. If NaF is less than 0.1%, this effect cannot be obtained, the arc becomes unstable, and the amount of spatter generated increases. On the other hand, when NaF exceeds 0.6%, the fluidity of the slag becomes excessive, the slag tends to drip, and a good bead cannot be obtained. Therefore, NaF is 0.1 to 0.6%.

[フラックス中の鉄粉中のFe分及び鉄合金中のFe分の合計:15〜25%]
鉄粉中のFe分及び鉄合金中のFe分は、溶滴を微細にしてアークを安定させる。また、溶接用ワイヤの溶着量を多くして溶接能率を向上する効果がある。鉄粉中のFe分及び鉄合金中のFe分の合計が15%未満であると、アークが不安定でスパッタ発生量が多くなる。一方、鉄粉中のFe分及び鉄合金中のFe分の合計が25%を超えると、フラックスの充填率が高くなりワイヤ製造時に伸線が困難となる。したがって、鉄粉中のFe分及び鉄合金中のFe分の合計は15〜25%とする。
[Total Fe content in iron powder and Fe content in iron alloy in flux: 15-25%]
The Fe content in the iron powder and the Fe content in the iron alloy make the droplets finer and stabilize the arc. In addition, it has the effect of increasing the welding amount of the welding wire to improve the welding efficiency. If the total of the Fe content in the iron powder and the Fe content in the iron alloy is less than 15%, the arc becomes unstable and the amount of spatter generated increases. On the other hand, if the total of the Fe content in the iron powder and the Fe content in the iron alloy exceeds 25%, the flux filling rate becomes high and wire drawing becomes difficult during wire production. Therefore, the total of the Fe content in the iron powder and the Fe content in the iron alloy is 15 to 25%.

[フラックス中の金属酸化物の合計:0.08%以下]
金属酸化物は、主に蛍石の不純物として含まれるSiO2やAl23である。これら金属酸化物の合計が0.08%を超えると、スラグ量が多くなりスラグ跳ねが生じるようになる。したがって、フラックス中の金属酸化物の合計は0.08%以下とする。なお、金属酸化物は、必須の元素ではなく、含有率が0%とされてもよい。
[Total metal oxides in flux: 0.08% or less]
The metal oxides are SiO 2 and Al 2 O 3 mainly contained as impurities in fluorite. When the total of these metal oxides exceeds 0.08%, the amount of slag increases and slag splashing occurs. Therefore, the total amount of metal oxides in the flux is 0.08% or less. The metal oxide is not an essential element, and the content may be 0%.

本発明のエレクトロガスアーク溶接用フラックス入りワイヤの残部は、鋼製外皮のFe及び不可避不純物である。不可避不純物については特に限定しないが、耐高温割れ性の観点から、Pは0.020%以下、Sは0.010%以下が好ましい。 The rest of the flux-cored wire for electrogas arc welding of the present invention is Fe and unavoidable impurities in the steel outer skin. The unavoidable impurities are not particularly limited, but from the viewpoint of high temperature crack resistance, P is preferably 0.020% or less and S is preferably 0.010% or less.

なお、本発明のエレクトロガスアーク溶接用フラックス入りワイヤは、鋼製外皮をパイプ状に形成し、内部にフラックスを充填する構造であり、鋼製外皮の合わせ目を溶接して継目の無いタイプと、鋼製外皮の合わせ目を溶接しないでかしめる継目を有するタイプに大別でき、本発明においてはどちらも適用できる。 The flux-cored wire for electrogas arc welding of the present invention has a structure in which a steel outer skin is formed in a pipe shape and the inside is filled with flux, and a seamless type in which the seams of the steel outer skin are welded is used. It can be roughly classified into a type having a seam that crimps the seam of the steel outer skin without welding, and both can be applied in the present invention.

また、フラックス充填率は特に制限はしないが、生産性の観点から、ワイヤ全質量に対して15〜30%とするのが好ましい。 The flux filling rate is not particularly limited, but is preferably 15 to 30% with respect to the total mass of the wire from the viewpoint of productivity.

以下、実施例により本発明の効果をさらに詳細に説明する。 Hereinafter, the effects of the present invention will be described in more detail with reference to Examples.

鋼製外皮としてJIS G3141 SPCCを使用し、該鋼製外皮をU字形に成形、フラックスを充填率15〜30%で充填してC字形に成形した後、鋼製外皮の合わせ目をかしめて、伸線し、表1に示す各種成分の溶接用フラックス入りワイヤを試作した。なお、試作したワイヤ径は1.6mmとした。 Using JIS G3141 SPCC as the steel hood, the steel hood is molded into a U shape, the flux is filled with a filling rate of 15 to 30% to form a C shape, and then the seams of the steel hood are crimped. Wires were drawn and flux-cored wires for welding of various components shown in Table 1 were prototyped. The diameter of the prototype wire was 1.6 mm.


Figure 2020157315
Figure 2020157315

表2に示す490MPa級高張力鋼(板厚50mm)を用いて、図1及び図2に示すエレクトロガスアーク溶接で、ルートギャップ2を10mm、開先角度を20°とした開先10の試験板を表3に示す溶接条件で溶接長500mmの大入熱1パス溶接を行った。 A test plate with a groove 10 having a root gap of 10 mm and a groove angle of 20 ° by electrogas arc welding shown in FIGS. 1 and 2 using 490 MPa class high-strength steel (plate thickness 50 mm) shown in Table 2. Was performed under the welding conditions shown in Table 3 for a large heat input 1-pass welding with a welding length of 500 mm.


Figure 2020157315
Figure 2020157315


Figure 2020157315
Figure 2020157315

各試験時のアークの安定性、スパッタ発生量、スラグ跳ねの有無及びビード外観を観察した。また、各試験板の板厚中央部より引張試験(JIS Z 2201 A2号)及び衝撃試験(JIS Z 2202 4号)を採取して機械試験を行った。機械試験において、引張強さが510〜690MPa、衝撃試験は−40℃における吸収エネルギーが50J以上(5本の平均)のものを良好とした。それらの結果を表4に示す。 The stability of the arc, the amount of spatter generated, the presence or absence of slag splash, and the appearance of the bead during each test were observed. In addition, a tensile test (JIS Z 2201 A2) and an impact test (JIS Z 22024) were collected from the central portion of each test plate to perform a mechanical test. In the mechanical test, the tensile strength was 510 to 690 MPa, and in the impact test, the absorbed energy at −40 ° C. was 50 J or more (average of 5 pieces). The results are shown in Table 4.


Figure 2020157315
Figure 2020157315

表1及び表4中ワイヤ記号W1〜W10が本発明例、ワイヤ記号W11〜W25は比較例である。本発明例であるワイヤ記号W1〜W10は、C、Si、Mn、Mo、Ti、B、Al及びMgの1種又は2種の合計、CaF2、NaF、鉄粉中のFe分及び鉄合金中のFe分の合計及び金属酸化物の合計が適量であるので、アークが安定し、スパッタ発生量が少なく、スラグ跳ねの頻度が少なく、ビード外観が良好で、さらに引張強さ及び吸収エネルギーともに良好で極めて満足な結果であった。 In Tables 1 and 4, the wire symbols W1 to W10 are examples of the present invention, and the wire symbols W11 to W25 are comparative examples. The wire symbols W1 to W10, which are examples of the present invention, are C, Si, Mn, Mo, Ti, B, Al and the total of two types of Mg, CaF 2 , NaF, Fe content in iron powder and an iron alloy. Since the total amount of Fe and the total amount of metal oxides are appropriate, the arc is stable, the amount of spatter generated is small, the frequency of slag splashing is low, the bead appearance is good, and both tensile strength and absorbed energy are both. The results were good and very satisfactory.

比較例中ワイヤ記号W11は、Cが少ないので、溶接金属の引張強さが低かった。また、CaF2が少ないので、溶接金属の吸収エネルギーも低値であった。 In the comparative example, the wire symbol W11 had a small amount of C, so that the tensile strength of the weld metal was low. Moreover, since CaF 2 is low, the absorbed energy of the weld metal is also low.

ワイヤ記号W12は、Cが多いので、溶接金属の引張強さが高く吸収エネルギーが低値であった。また、NaFが少ないので、アークが不安定でスパッタ発生量も多かった。 Since the wire symbol W12 has a large amount of C, the tensile strength of the weld metal is high and the absorbed energy is low. Moreover, since the amount of NaF was small, the arc was unstable and the amount of spatter generated was large.

ワイヤ記号W13は、Siが少ないので、ビード外観が不良で、溶接金属の吸収エネルギーが低値であった。 Since the wire symbol W13 has a small amount of Si, the bead appearance is poor and the absorbed energy of the weld metal is low.

ワイヤ記号W14は、Siが多いので、スラグ生成量が多くなりスラグ跳ねの頻度が多かった。また、溶接金属の引張強さが高く吸収エネルギーが低値であった。 Since the wire symbol W14 contains a large amount of Si, the amount of slag generated is large and the frequency of slag bounce is high. In addition, the tensile strength of the weld metal was high and the absorbed energy was low.

ワイヤ記号W15は、Mnが少ないので、ビード外観が不良で、溶接金属の引張強さが低く吸収エネルギーも低値であった。 Since the wire symbol W15 has a small amount of Mn, the bead appearance is poor, the tensile strength of the weld metal is low, and the absorbed energy is also low.

ワイヤ記号W16は、Mnが多いので、スラグ生成量が多くなりスラグ跳ねの頻度が多かった。また、溶接金属の引張強さが高く吸収エネルギーが低値であった。 Since the wire symbol W16 has a large amount of Mn, the amount of slag generated is large and the frequency of slag bounce is high. In addition, the tensile strength of the weld metal was high and the absorbed energy was low.

ワイヤ記号W17は、Moが少ないので、溶接金属の引張強さが低くかった。また、鉄粉中のFe分及び鉄合金中のFe分の合計が少ないので、アークが不安定でスパッタ発生量が多かった。 Since the wire symbol W17 has a small amount of Mo, the tensile strength of the weld metal was low. Further, since the total of Fe content in the iron powder and Fe content in the iron alloy was small, the arc was unstable and the amount of spatter generated was large.

ワイヤ記号W18は、Moが多いので、溶接金属の引張強さが高く吸収エネルギーが低値であった。また、CaF2が多いので、スパッタ発生量が多く、またスラグ跳ねの頻度が多かった。 Since the wire symbol W18 has a large amount of Mo, the tensile strength of the weld metal is high and the absorbed energy is low. In addition, since there is a large amount of CaF 2 , the amount of spatter generated is large and the frequency of slag bounce is high.

ワイヤ記号W19は、Tiが少ないので、溶接金属の吸収エネルギーが低値であった。また、金属酸化物の合計が多いので、スラグが過剰になってスラグ跳ねの頻度が多かった。 Since the wire symbol W19 has a small amount of Ti, the absorbed energy of the weld metal is low. In addition, since the total amount of metal oxides was large, the slag was excessive and the slag bounced frequently.

ワイヤ記号W20は、Tiが多いので、溶接金属の吸収エネルギーが低値であった。また、NaFが多いので、ビード外観が不良であった。 Since the wire symbol W20 has a large amount of Ti, the absorbed energy of the weld metal is low. Moreover, since there was a large amount of NaF, the bead appearance was poor.

ワイヤ記号W21は、Bが少ないので、溶接金属の吸収エネルギーが低値であった。 Since the wire symbol W21 has a small amount of B, the absorbed energy of the weld metal is low.

ワイヤ記号W22は、Bが多いので、溶接金属の引張強さが高く吸収エネルギーが低値であった。 Since the wire symbol W22 has a large amount of B, the tensile strength of the weld metal is high and the absorbed energy is low.

ワイヤ記号W23は、AlとMgの合計が少ないので、溶接金属の吸収エネルギーが低値であった。 Since the total amount of Al and Mg of the wire symbol W23 is small, the absorbed energy of the weld metal is low.

ワイヤ記号W24は、AlとMgの合計が多いので、溶接金属の引張強さが高く吸収エネルギーが低値であった。また、スラグ跳ねの頻度が多かった。 Since the wire symbol W24 has a large total of Al and Mg, the tensile strength of the weld metal is high and the absorbed energy is low. In addition, the frequency of slag bounce was high.

ワイヤ記号W25は、鉄粉中のFe分及び鉄合金中のFe分の合計が多いので、ワイヤ製造時の伸線で断線が多発したので、溶接試験は中止した。 Since the wire symbol W25 has a large total of Fe content in iron powder and Fe content in iron alloy, disconnection occurred frequently due to wire drawing during wire production, so the welding test was stopped.

1 鋼板
2 ルートギャップ
3 溶接用ワイヤ
4 溶接トーチ
5 ガス供給ノズル
6 溶接金属
7 冷却水供給ノズル
8 固定裏当材
9 摺動銅当金の溝
10 開先
11 摺動銅当金
12 溶融金属
1 Steel plate 2 Root gap 3 Welding wire 4 Welding torch 5 Gas supply nozzle 6 Welding metal 7 Cooling water supply nozzle 8 Fixed backing material 9 Sliding copper metal groove 10 Groove 11 Sliding copper metal 12 Molten metal

Claims (1)

鋼製外皮にフラックスを充填してなるエレクトロガスアーク溶接用フラックス入りワイヤにおいて、
ワイヤ全質量に対する質量%で、鋼製外皮とフラックスの合計で、
C:0.02〜0.10%、
Si:0.3〜1.1%、
Mn:1.8〜3.3%、
Mo:0.2〜0.8%、
Ti:0.05〜0.25%、
B:0.004〜0.020%、
Al及びMgの1種又は2種の合計:0.1〜0.3%を含有し、
さらに、ワイヤ全質量に対する質量%で、フラックス中に、
CaF2:0.2〜0.8%、
NaF:0.1〜0.6%、
鉄粉中のFe分及び鉄合金中のFe分の合計:15〜25%を含有し、
金属酸化物の合計:0.08%以下であり、
残部は鋼製外皮のFe分及び不可避不純物からなることを特徴とするエレクトロガスアーク溶接用フラックス入りワイヤ。
In a flux-cored wire for electrogas arc welding, which is made by filling a steel outer skin with flux.
Mass% of total wire mass, total of steel skin and flux,
C: 0.02 to 0.10%,
Si: 0.3-1.1%,
Mn: 1.8-3.3%,
Mo: 0.2-0.8%,
Ti: 0.05-0.25%,
B: 0.004 to 0.020%,
Total of 1 or 2 types of Al and Mg: 0.1 to 0.3%
In addition, in the flux, in mass% of the total mass of the wire,
CaF 2 : 0.2-0.8%,
NaF: 0.1-0.6%,
The total of Fe content in iron powder and Fe content in iron alloy is 15 to 25%.
Total of metal oxides: 0.08% or less,
The balance is a flux-cored wire for electrogas arc welding, which is composed of Fe content of a steel outer skin and unavoidable impurities.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020175399A (en) * 2019-04-15 2020-10-29 日鉄溶接工業株式会社 Flux-cored wire for electrogas arc welding
JP2021070051A (en) * 2019-10-31 2021-05-06 日鉄溶接工業株式会社 Flux-cored wire for gas shield arc welding

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Publication number Priority date Publication date Assignee Title
JPS63140798A (en) * 1986-12-03 1988-06-13 Nippon Steel Corp Composite wire for electrogas arc welding
CN104148824A (en) * 2014-09-01 2014-11-19 四川大西洋焊接材料股份有限公司 High-tenacity flux-cored wire for electro-gas welding
JP2018192520A (en) * 2017-05-22 2018-12-06 新日鐵住金株式会社 Flux-cored wire for gas shield arc welding, and manufacturing method of weld joint
JP2019104020A (en) * 2017-12-11 2019-06-27 日本製鉄株式会社 Flux-cored wire for vertical electrogas arc welding, and method for producing weld joint

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63140798A (en) * 1986-12-03 1988-06-13 Nippon Steel Corp Composite wire for electrogas arc welding
CN104148824A (en) * 2014-09-01 2014-11-19 四川大西洋焊接材料股份有限公司 High-tenacity flux-cored wire for electro-gas welding
JP2018192520A (en) * 2017-05-22 2018-12-06 新日鐵住金株式会社 Flux-cored wire for gas shield arc welding, and manufacturing method of weld joint
JP2019104020A (en) * 2017-12-11 2019-06-27 日本製鉄株式会社 Flux-cored wire for vertical electrogas arc welding, and method for producing weld joint

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2020175399A (en) * 2019-04-15 2020-10-29 日鉄溶接工業株式会社 Flux-cored wire for electrogas arc welding
JP7244337B2 (en) 2019-04-15 2023-03-22 日鉄溶接工業株式会社 Flux-cored wire for electrogas arc welding
JP2021070051A (en) * 2019-10-31 2021-05-06 日鉄溶接工業株式会社 Flux-cored wire for gas shield arc welding
JP7244399B2 (en) 2019-10-31 2023-03-22 日鉄溶接工業株式会社 Flux-cored wire for gas-shielded arc welding

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