JP5890280B2 - Low hydrogen coated arc welding rod - Google Patents
Low hydrogen coated arc welding rod Download PDFInfo
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- JP5890280B2 JP5890280B2 JP2012181415A JP2012181415A JP5890280B2 JP 5890280 B2 JP5890280 B2 JP 5890280B2 JP 2012181415 A JP2012181415 A JP 2012181415A JP 2012181415 A JP2012181415 A JP 2012181415A JP 5890280 B2 JP5890280 B2 JP 5890280B2
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/365—Selection of non-metallic compositions of coating materials either alone or conjoint with selection of soldering or welding materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
- B23K35/0255—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in welding
- B23K35/0261—Rods, electrodes, wires
- B23K35/0266—Rods, electrodes, wires flux-cored
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
- B23K35/36—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest
- B23K35/3601—Selection of non-metallic compositions, e.g. coatings, fluxes; Selection of soldering or welding materials, conjoint with selection of non-metallic compositions, both selections being of interest with inorganic compounds as principal constituents
- B23K35/3603—Halide salts
- B23K35/3605—Fluorides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
- B23K35/40—Making wire or rods for soldering or welding
- B23K35/404—Coated rods; Coated electrodes
Description
本発明は、低水素系被覆アーク溶接棒に関する。より詳しくは、本発明は、造船、建築及び海洋構造物等の溶接に用いられる低水素系被覆アーク溶接棒に関する。 The present invention relates to a low hydrogen-based coated arc welding rod. More specifically, the present invention relates to a low hydrogen based arc welding rod used for welding shipbuilding, building, marine structures and the like.
近年、構造物等の大型化に伴い、鋼板が高強度化及び厚板化しており、その溶接部に良好な耐割れ性を確保するため、さらなる低水素系溶加材が要求されている。種々の溶加材のなかでも、低水素系被覆アーク溶接棒は、例えば、鋼心線を炭酸石灰や蛍石等を主成分とする被覆剤で被覆した構成であり、靭性、耐割れ性をはじめ、優れた機械的性質が得られることから、幅広い分野で適用されている。低水素系被覆アーク溶接棒は、耐割れ性に影響する拡散性水素量が他の被覆系溶接棒と比較して少ない。 In recent years, with the increase in size of structures and the like, steel sheets have been increased in strength and thickness, and further low hydrogen-based filler materials are required in order to ensure good crack resistance at the welds. Among various filler metals, the low hydrogen-based coated arc welding rod, for example, has a structure in which a steel core wire is coated with a coating agent mainly composed of lime carbonate, fluorite, etc., and has toughness and crack resistance. First, it has been applied in a wide range of fields because of its excellent mechanical properties. The low hydrogen-based coated arc welding rod has a smaller amount of diffusible hydrogen that affects cracking resistance than other coated welding rods.
従来、２％以上の炭酸ガスを含む雰囲気下、特定の温度で焼成することで製造される低水素系被覆アーク溶接棒が提案されている（特許文献１、２参照）。このような製造方法で製造される低水素系被覆アーク溶接棒では、溶接棒中の水素源であるＯＨの含有量が少なくなり、溶接部の拡散性水素量を低減して、耐割れ性を良好にすることができる。 Conventionally, a low hydrogen-based coated arc welding rod manufactured by firing at a specific temperature in an atmosphere containing 2% or more carbon dioxide has been proposed (see Patent Documents 1 and 2). In a low hydrogen-based coated arc welding rod manufactured by such a manufacturing method, the content of OH, which is a hydrogen source in the welding rod, is reduced, reducing the amount of diffusible hydrogen in the welded portion and improving crack resistance. Can be good.
また、従来、炭酸石灰、蛍石及びＶを有する被覆剤を含有することで、溶接金属中にＶを特定量含有させ、溶接金属の割れ感受性を低下させることが可能な低水素系被覆アーク溶接棒も提案されている（特許文献３参照）。なお、上記の蛍石を含有する低水素系被覆アーク溶接棒の技術としては、蛍石の粒径を特定の範囲にすることで、被覆筒の片溶け現象を防止し、健全な溶接金属を得る技術も提案されている（特許文献４参照）。 In addition, conventionally, a low hydrogen based arc welding that can contain a specific amount of V in the weld metal and reduce the cracking susceptibility of the weld metal by containing a coating agent having lime carbonate, fluorite, and V. A bar has also been proposed (see Patent Document 3). In addition, as a technique of the above-mentioned low hydrogen-based coated arc welding rod containing fluorite, by setting the particle size of the fluorite to a specific range, the melting phenomenon of the coated cylinder can be prevented, and a sound weld metal can be obtained. The technique to obtain is also proposed (refer patent document 4).
しかしながら、特許文献１、２に記載の低水素系被覆アーク溶接棒は、前述した製造方法で製造するために、従来用いられている生産設備の変更が必要となる。また、この製造方法では、焼成温度を高めるため、低水素系被覆アーク溶接棒の製造コストが高くなるという問題もある。 However, since the low hydrogen-based coated arc welding rods described in Patent Documents 1 and 2 are manufactured by the above-described manufacturing method, it is necessary to change the production equipment used conventionally. Moreover, in this manufacturing method, since the firing temperature is increased, there is a problem that the manufacturing cost of the low hydrogen-based coated arc welding rod increases.
更に、特許文献３に記載の低水素系被覆アーク溶接棒では、拡散性水素量を低減する以外の方法で耐割れ性を確保している。しかしながら、特許文献３に記載の低水素系被覆アーク溶接棒では、溶接金属へのＶの添加により、７８０ＭＰａ級高張力鋼等の高強度材（耐熱鋼）の再熱割れが発生する可能性がある。このように、従来の低水素系被覆アーク溶接棒では、拡散性水素量の低減に対する効果は十分ではない。 Further, in the low hydrogen-based coated arc welding rod described in Patent Document 3, crack resistance is ensured by a method other than reducing the amount of diffusible hydrogen. However, in the low hydrogen-based coated arc welding rod described in Patent Document 3, there is a possibility that reheat cracking of a high-strength material (heat-resistant steel) such as a 780 MPa class high-strength steel may occur due to the addition of V to the weld metal. is there. As described above, the conventional low hydrogen-based coated arc welding rod is not sufficiently effective in reducing the amount of diffusible hydrogen.
そこで、本発明は、従来用いられている生産設備を変更することなく、溶接金属中の拡散性水素量を低減することが可能な低水素系被覆アーク溶接棒を提供することを主目的とする。 Accordingly, the main object of the present invention is to provide a low hydrogen-based coated arc welding rod capable of reducing the amount of diffusible hydrogen in the weld metal without changing the production equipment used conventionally. .
本発明に係る低水素系被覆アーク溶接棒は、前述した課題を解決するために、本発明者等の鋭意検討の結果完成されたものであり、炭素鋼からなる心線を被覆剤で被覆した低水素系被覆アーク溶接棒について、前記被覆剤の被覆率が溶接棒全質量あたり２５〜４０質量％とし、前記被覆剤を、該被覆剤全質量あたり、炭酸石灰：２０〜６０質量％、蛍石：５〜２５質量％、並びに、水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金からなる群から選択される少なくとも１種（ＳｉＯ２換算）：５〜２５質量％、を含有すると共に、ＭｇＯ及び／又はＭｇＣＯ３（ＭｇＯ換算）：０．１質量％以下、金属Ｍｇ及び／又はＭｇ合金（Ｍｇ換算）：０．５質量％以下に規制した成分組成にする。また、前記炭酸石灰は、粒径が１０μｍ以下の粒子を４０質量％以上とし、前記蛍石は、粒径が１００μｍ以上の粒子を４０質量％以上とする。
この低水素系被覆アーク溶接棒では、被覆剤は、該被覆剤全質量あたり、鉄粉：４５質量％以下を含有していてもよい。
この低水素系被覆アーク溶接棒では、被覆剤は、更に、該被覆剤全質量あたり、Ｍｎ及び／又はＭｎ合金（Ｍｎ換算）：０．１〜６．０質量％を含有していてもよい。
この低水素系被覆アーク溶接棒では、被覆剤は、更に、該被覆剤全質量あたり、Ｎｉ：０．１〜１０．０質量％、Ｔｉ及び／又はＴｉ合金（Ｔｉ換算）：０．１〜３．０質量％、Ｂ及び／又はＢ化合物（Ｂ換算）：０．０１〜０．５０質量％からなる群から選択される少なくとも１種を含有していてもよい。また、、この低水素系被覆アーク溶接棒では、被覆剤は、Ｍｏ：０．１〜６．０質量％及び／又はＣｒ：０．１〜１０．０質量％を含有していてもよい。
The low hydrogen-based coated arc welding rod according to the present invention has been completed as a result of intensive studies by the present inventors in order to solve the above-described problems, and a core wire made of carbon steel is coated with a coating agent. With respect to the low hydrogen-based coated arc welding rod, the coating rate of the coating agent is 25 to 40% by mass with respect to the total mass of the welding rod, and the coating agent is lime carbonate: 20 to 60% by mass, Stone: 5 to 25% by mass, and at least one selected from the group consisting of water glass, oxalic acid mineral, metal Si and Si alloy (in terms of SiO 2 ): 5 to 25% by mass, and MgO And / or MgCO 3 (MgO conversion): 0.1 mass% or less, metal Mg and / or Mg alloy (Mg conversion): The component composition is regulated to 0.5 mass% or less. In addition, the lime carbonate has a particle size of 10 μm or less at 40% by mass or more, and the fluorite has a particle size of 100 μm or more at 40% by mass or more.
In this low hydrogen-based coated arc welding rod, the coating agent may contain iron powder: 45% by mass or less per total mass of the coating agent.
In this low hydrogen-based coated arc welding rod, the coating material may further contain Mn and / or Mn alloy (Mn conversion): 0.1 to 6.0% by mass with respect to the total mass of the coating material. .
In this low hydrogen-based coated arc welding rod, the coating agent further comprises Ni: 0.1 to 10.0% by mass, Ti and / or Ti alloy (Ti conversion): 0.1 to the total mass of the coating agent. 3.0 mass%, B and / or B compound (B conversion): You may contain at least 1 sort (s) selected from the group which consists of 0.01-0.50 mass%. Moreover, in this low hydrogen type | system | group covering arc welding rod, the coating material may contain Mo: 0.1-6.0 mass% and / or Cr: 0.1-10.0 mass%.
本発明によれば、従来用いられている生産設備を変更することなく、溶接金属中の拡散性水素量を低減することができる。 ADVANTAGE OF THE INVENTION According to this invention, the amount of diffusible hydrogen in a weld metal can be reduced, without changing the production equipment used conventionally.
以下、本発明を実施するための形態について、詳細に説明する。なお、本発明は、以下に説明する実施形態に限定されるものではない。 Hereinafter, embodiments for carrying out the present invention will be described in detail. Note that the present invention is not limited to the embodiments described below.
本発明の実施形態に係る低水素系被覆アーク溶接棒は、炭素鋼からなる心線を被覆剤で被覆した低水素系被覆アーク溶接棒であり、被覆剤の被覆率が溶接棒全質量あたり２５〜４０質量％である。また、この被覆剤は、その全質量あたり、炭酸石灰：２０〜６０質量％、蛍石：５〜２５質量％、並びに、水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金からなる群から選択される少なくとも１種（ＳｉＯ２換算）：５〜２５質量％を含有する。また、この被覆剤は、ＭｇＯ及び／又はＭｇＣＯ３（ＭｇＯ換算）：０．１質量％以下、金属Ｍｇ及び／又はＭｇ合金（Ｍｇ換算）：０．５質量％以下に規制される。更に、この炭酸石灰は、粒径が１０μｍ以下の粒子が４０質量％以上である。また、この蛍石は、粒径が１００μｍ以上の粒子が４０質量％以上である。 The low hydrogen-based coated arc welding rod according to an embodiment of the present invention is a low hydrogen-based coated arc welding rod in which a core wire made of carbon steel is coated with a coating agent, and the coating rate of the coating agent is 25 per total mass of the welding rod. -40 mass%. Further, the coating agent is selected from the group consisting of lime carbonate: 20 to 60% by mass, fluorite: 5 to 25% by mass, and water glass, oxalate mineral, metal Si, and Si alloy per total mass. At least one type (SiO 2 equivalent): 5 to 25% by mass. Moreover, this coating material is regulated to MgO and / or MgCO 3 (MgO conversion): 0.1 mass% or less, and metal Mg and / or Mg alloy (Mg conversion): 0.5 mass% or less. Further, the lime carbonate has a particle size of 10% or less and 40% by mass or more. Further, this fluorite has 40% by mass or more of particles having a particle size of 100 μm or more.
［溶接棒全質量に対する被覆剤の被覆率：２５〜４０質量％］
被覆アーク溶接棒の被覆剤の被覆率（％）は、（被覆剤の質量（質量％）／溶接棒全質量（質量％））×１００により算出される。被覆率が高くなるほど、鉄粉及び合金成分の添加比率の調整範囲が広がり、目的の性能が得られやすくなる。ただし、被覆率が４０質量％を超えるとスラグ生成量が増え、アークの強さとスラグ流動性とのバランスが不良となり、良好な溶接作業性が得られなくなる。一方、この被覆率が２５質量％未満であると、被覆の保護筒としての機能が不十分になりアーク安定性が劣化する。よって、本実施形態の低水素系被覆アーク溶接棒においては、被覆剤の被覆率は２５〜４０質量％とする。
[Coating ratio of coating agent with respect to total mass of welding rod: 25 to 40% by mass]
The coating rate (%) of the coating agent of the coated arc welding rod is calculated by (mass of coating agent (mass%) / total mass of welding rod (mass%)) × 100. The higher the coverage, the wider the adjustment range of the addition ratio of iron powder and alloy components, and the easier it is to obtain the desired performance. However, when the coverage exceeds 40% by mass, the amount of slag generated increases, the balance between arc strength and slag fluidity becomes poor, and good welding workability cannot be obtained. On the other hand, when the coverage is less than 25% by mass, the function as a protective cylinder of the coating becomes insufficient and the arc stability is deteriorated. Therefore, in the low hydrogen-based coated arc welding rod of this embodiment, the coating rate of the coating agent is 25 to 40% by mass.
次に、本実施形態の低水素系被覆アーク溶接棒に含まれる被覆剤の成分限定理由について説明する。なお、本実施形態の低水素系被覆アーク溶接棒の被覆剤中の各成分の含有量は、被覆剤全質量あたりの含有量である。 Next, the reason for limiting the components of the coating contained in the low hydrogen-based coated arc welding rod of this embodiment will be described. In addition, content of each component in the coating material of the low hydrogen type | system | group covering arc welding rod of this embodiment is content per total mass of a coating material.
［炭酸石灰：２０〜６０質量％］
被覆剤に炭酸石灰を含有させると、溶接棒の被覆剤層を多孔質にすることができ、これにより、被覆アーク溶接棒製造時のベーキングにおいて水分の離脱が促進される。しかしながら、被覆剤の中で、炭酸石灰の含有量が２０質量％未満の場合、低水素系被覆アーク溶接棒の製造時のベーキングにおいて水分の離脱が得られない。一方で、炭酸石灰の含有量が６０質量％を超えた場合、スラグの流動性が劣化し、ビード形状が劣化する。
[Lime carbonate: 20-60% by mass]
When lime carbonate is contained in the coating agent, the coating layer of the welding rod can be made porous, which promotes moisture detachment in baking during the production of the coated arc welding rod. However, in the coating agent, when the content of lime carbonate is less than 20% by mass, moisture cannot be removed in baking during the production of the low hydrogen-based coated arc welding rod. On the other hand, when content of lime carbonate exceeds 60 mass%, the fluidity | liquidity of slag deteriorates and a bead shape deteriorates.
また、炭酸石灰は、粒径が１０μｍ以下の粒子の含有量が炭酸石灰全質量の４０質量％未満である場合、低水素系被覆アーク溶接棒製造時のベーキングにおいて水分の離脱が得られない。よって、本実施形態の低水素系被覆アーク溶接棒では、炭酸石灰の含有量を被覆剤全質量あたり２０〜６０質量％とし、かつ、粒径が１０μｍ以下の粒子の含有量を炭酸石灰全質量あたり４０質量％以上とする。 Further, when the content of particles having a particle size of 10 μm or less is less than 40% by mass of the total mass of lime carbonate, moisture separation cannot be obtained in baking at the time of manufacturing the low hydrogen-based coated arc welding rod. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, the content of lime carbonate is 20 to 60% by mass with respect to the total mass of the coating agent, and the content of particles having a particle size of 10 μm or less is the total mass of lime carbonate. 40 mass% or more per unit.
［蛍石：５〜２５質量％］
蛍石は、スラグの流動性の調整及び溶接金属の清浄性を得るための成分である。しかしながら、被覆剤の中で、蛍石の含有量が５質量％未満の場合、スラグの流動性が劣化し、ビード形状が劣化すると共に、溶接金属の清浄性が低下するため、靭性が低下する。一方で、蛍石が２５質量％を超えるとスラグの流動性が良くなり過ぎ、ビード形成が劣化すると共に、アーク安定性が劣化する。
[Fluorite: 5-25% by mass]
Fluorite is a component for adjusting the fluidity of the slag and obtaining the cleanliness of the weld metal. However, when the content of fluorite is less than 5% by mass in the coating agent, the fluidity of the slag is deteriorated, the bead shape is deteriorated, and the cleanliness of the weld metal is lowered, so that the toughness is lowered. . On the other hand, if the fluorite exceeds 25% by mass, the fluidity of the slag becomes too good, the bead formation deteriorates, and the arc stability deteriorates.
また、蛍石は、粒径が１００μｍ以上の粒子が４０質量％未満の場合、アーク安定性が劣化する。よって、本実施形態の低水素系被覆アーク溶接棒では、蛍石の含有量を被覆剤全質量あたり５〜２５質量％とし、かつ、粒径が１００μｍ以上の粒子の含有量を蛍石全質量あたり４０質量％以上とする。 In addition, when fluorite has less than 40% by mass of particles having a particle size of 100 μm or more, the arc stability deteriorates. Therefore, in the low hydrogen-based coated arc welding rod of this embodiment, the content of fluorite is 5 to 25% by mass with respect to the total mass of the coating agent, and the content of particles having a particle size of 100 μm or more is the total mass of fluorite. 40 mass% or more per unit.
［水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金からなる群から選択される少なくとも１種（ＳｉＯ２換算）：５〜２５質量％］
ＳｉＯ２はアークの強さ、アーク安定性及びビード形状を向上させるために必須の成分である。ＳｉＯ２を含有する成分としては、水ガラス及び硅酸鉱物等が挙げられる。また、ＳｉＯ２は、Ｓｉが溶接中に酸化することでも得られる。そして、Ｓｉを含有する成分としては、金属Ｓｉ及びＳｉ合金等が挙げられる。ただし、ＳｉＯ２源となる水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金の合計含有量が、被覆剤の中で、ＳｉＯ２換算で５％未満の場合、アーク安定性が劣化し、ビード形状が劣化する。
[At least one selected from the group consisting of water glass, oxalic acid mineral, metal Si and Si alloy (in terms of SiO 2 ): 5 to 25% by mass]
SiO 2 is an essential component for improving arc strength, arc stability, and bead shape. Examples of the component containing SiO 2 include water glass and oxalic acid mineral. SiO 2 can also be obtained by oxidizing Si during welding. And as a component containing Si, metal Si, Si alloy, etc. are mentioned. However, if the total content of water glass, oxalic acid mineral, metal Si and Si alloy as the SiO 2 source is less than 5% in terms of SiO 2 in the coating agent, the arc stability deteriorates and the bead shape Deteriorates.
一方、水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金の合計含有量がＳｉＯ２換算で２５質量％を超えると、アークの強さが大きくなり過ぎ、大気の巻き込みが多くなる。よって、本実施形態の低水素系被覆アーク溶接棒では、被覆剤全質量あたり、水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金からなる群から選択される少なくとも１種の含有量をＳｉＯ２換算で５〜２５質量％とする。 On the other hand, when the total content of water glass, oxalic acid mineral, metal Si and Si alloy exceeds 25% by mass in terms of SiO 2 , the strength of the arc becomes too large and the entrainment of the atmosphere increases. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, the content of at least one selected from the group consisting of water glass, oxalic acid mineral, metal Si and Si alloy is converted into SiO 2 per total mass of the coating agent. 5 to 25% by mass.
［ＭｇＯ及び／又はＭｇＣＯ３（ＭｇＯ換算）：０．１質量％以下］
ＭｇＯ及びＭｇＣＯ３は、アーク安定性及びスラグの流動性の調整に有効である。しかしながら、被覆剤の中で、ＭｇＯ及び／又はＭｇＣＯ３と、粘結剤である水ガラスとが共存していると、Ｍｇ（ＯＨ）２が生成される。Ｍｇ（ＯＨ）２のＯＨは、大気圧下、４００℃程度の通常の焼成温度では被覆剤から遊離されずに残存するため、Ｍｇ（ＯＨ）２が生成すると、溶接金属中の拡散性水素量が増加する。具体的には、ＭｇＯ及びＭｇＣＯ３の合計の含有量が、ＭｇＯ換算で０．１質量％を超えると、ＯＨの生成により拡散性水素量が十分低減されなくなる。
[MgO and / or MgCO 3 (MgO conversion): 0.1% by mass or less]
MgO and MgCO 3 are effective in adjusting arc stability and slag fluidity. However, Mg (OH) 2 is produced when MgO and / or MgCO 3 and water glass as a binder coexist in the coating agent. Since OH of Mg (OH) 2 remains without being released from the coating agent at a normal firing temperature of about 400 ° C. under atmospheric pressure, when Mg (OH) 2 is generated, the amount of diffusible hydrogen in the weld metal Will increase. Specifically, when the total content of MgO and MgCO 3 exceeds 0.1% by mass in terms of MgO, the amount of diffusible hydrogen is not sufficiently reduced due to the generation of OH.
よって、ＯＨの生成を抑制するためにはＭｇＯ及びＭｇＣＯ３の合計の含有量は少ない方が好ましく、本実施形態の低水素系被覆アーク溶接棒においては、ＭｇＯ及びＭｇＣＯ３の含有量を、被覆剤全質量あたり、ＭｇＯ換算で０．１質量％以下（０質量％でもよい）に規制する。 Therefore, in order to suppress the production of OH, it is preferable that the total content of MgO and MgCO 3 is small. In the low hydrogen-based coated arc welding rod of the present embodiment, the contents of MgO and MgCO 3 are coated. The total amount of the agent is regulated to 0.1% by mass or less (or 0% by mass) in terms of MgO.
［金属Ｍｇ及び／又はＭｇ合金（Ｍｇ換算）：０．５質量％以下］
金属Ｍｇ及びＭｇ合金は、脱酸剤として作用するため、これらを添加することで清浄な溶接金属が得られる。その一方で、金属Ｍｇ及びＭｇ合金は、アークの強さを大きくする作用もあるため、その含有量を規制することが好ましい。具体的には、金属Ｍｇ及びＭｇ合金の合計の含有量が、被覆剤の中で、Ｍｇ換算で０．５質量％を超えるとアークの強さが大きくなり過ぎ、大気雰囲気の巻き込みが多くなる。よって、本実施形態の低水素系被覆アーク溶接棒においては、金属Ｍｇ及びＭｇ合金の合計の含有量は、被覆剤全質量あたり、Ｍｇ換算で０．５質量％以下（０質量％でもよい）に規制する。なお、Ｍｇ合金としては、Ｎｉ−Ｍｇ及びＡｌ−Ｍｇ等が挙げられる。
[Metal Mg and / or Mg alloy (Mg conversion): 0.5% by mass or less]
Since metallic Mg and Mg alloy act as a deoxidizer, a clean weld metal can be obtained by adding them. On the other hand, since the metal Mg and Mg alloy also have an action of increasing the strength of the arc, it is preferable to regulate the content thereof. Specifically, when the total content of metal Mg and Mg alloy exceeds 0.5 mass% in terms of Mg in the coating agent, the strength of the arc becomes too large and the entrainment in the air atmosphere increases. . Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, the total content of the metal Mg and the Mg alloy is 0.5% by mass or less (may be 0% by mass) in terms of Mg per total mass of the coating agent. To regulate. Examples of the Mg alloy include Ni—Mg and Al—Mg.
［鉄粉：４５質量％以下］
鉄粉は、一般的に溶接能率の向上に有効であり、溶滴移行の安定化及び大気の巻き込みの低減にも効果があるため、必要に応じて添加することができる。しかしながら、鉄粉の含有量が、被覆剤の中で、４５質量％を超えると炭酸石灰、蛍石及びアーク安定剤の含有量が少なくなり、被覆剤の調製が困難になって、アーク安定性が劣化する。よって、本実施形態の低水素系被覆アーク溶接棒において、鉄粉を添加する場合は、被覆剤全質量あたり、４５質量％以下とする。
[Iron powder: 45% by mass or less]
Iron powder is generally effective in improving the welding efficiency, and is effective in stabilizing droplet transfer and reducing air entrainment. Therefore, iron powder can be added as necessary. However, if the content of iron powder exceeds 45% by mass in the coating agent, the content of lime carbonate, fluorite and arc stabilizer is reduced, making the preparation of the coating agent difficult, and arc stability. Deteriorates. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, when iron powder is added, the amount is 45% by mass or less based on the total mass of the coating agent.
［Ｍｎ及び／又はＭｎ合金（Ｍｎ換算）：０．１〜６．０質量％］
Ｍｎは、脱酸剤として作用するため、必要に応じて、Ｍｎ単体及び／又はＭｎ合金の形態で添加することができる。また、Ｍｎ及びＭｎ合金は、強度と靭性を安定させる効果もある。しかしながら、Ｍｎ及びＭｎ合金の合計の含有量が、被覆剤の中で、Ｍｎ換算で６．０質量％を超えると、強度が大きくなり過ぎ、低温割れ感受性が高まる。一方で、Ｍｎ及びＭｎ合金の合計の含有量がＭｎ換算で０．１質量％未満の場合、脱酸不足となり、ブローホールが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｍｎ及び／又はＭｎ合金を添加する場合は、被覆剤全質量あたり、Ｍｎ換算で０．１〜６．０質量％とする。
[Mn and / or Mn alloy (Mn conversion): 0.1 to 6.0% by mass]
Since Mn acts as a deoxidizer, it can be added in the form of Mn alone and / or Mn alloy as required. Mn and Mn alloys also have the effect of stabilizing strength and toughness. However, when the total content of Mn and the Mn alloy exceeds 6.0% by mass in terms of Mn in the coating agent, the strength becomes too high and the cold cracking susceptibility increases. On the other hand, when the total content of Mn and the Mn alloy is less than 0.1% by mass in terms of Mn, deoxidation is insufficient and blowholes are likely to occur. Therefore, when adding Mn and / or a Mn alloy in the low hydrogen-based coated arc welding rod of this embodiment, the Mn content is 0.1 to 6.0% by mass in terms of Mn per total mass of the coating agent.
なお、Ｍｎ源のＣの含有量は、Ｍｎ原料全質量あたり０．５質量％を超えると、アークの強さが大きくなり、大気の巻き込みが多くなるため、Ｍｎ源のＣの含有量は、Ｍｎ原料全質量あたり０．５質量％以下であることが好ましい。 Note that when the content of C in the Mn source exceeds 0.5 mass% per total mass of the Mn raw material, the strength of the arc increases and the entrainment of the air increases. It is preferable that it is 0.5 mass% or less per Mn raw material total mass.
［Ｎｉ：０．１〜１０．０質量％］
Ｎｉは、溶接金属の靭性の安定化に有効であるため、必要に応じて添加することができる。しかしながら、Ｎｉの含有量が０．１質量％未満の場合、十分な靱性改善効果を得られない場合がある。一方で、Ｎｉの含有量が、被覆剤の中で、１０．０質量％を超えると、高温割れが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｎｉを添加する場合は、被覆剤全質量あたり、０．１〜１０．０質量％の範囲とする。
[Ni: 0.1 to 10.0% by mass]
Ni is effective in stabilizing the toughness of the weld metal and can be added as necessary. However, when the Ni content is less than 0.1% by mass, a sufficient toughness improving effect may not be obtained. On the other hand, when the content of Ni exceeds 10.0% by mass in the coating agent, hot cracking is likely to occur. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, when Ni is added, the range is 0.1 to 10.0% by mass with respect to the total mass of the coating agent.
［Ｔｉ及び／又はＴｉ合金（Ｔｉ換算）：０．１〜３．０質量％］
Ｔｉ及びＴｉ合金は、前述したＮｉと同様に、溶接金属の靭性の安定化に有効であるため、必要に応じて添加することができる。しかしながら、Ｔｉの含有量が、被覆剤の中で、０．１質量％未満の場合、十分な靱性改善効果を得られない場合がある。一方で、Ｔｉの含有量が１０．０質量％を超えると、高温割れが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｔｉ及び／又はＴｉ合金を添加する場合は、被覆剤全質量あたり、０．１〜３．０質量％の範囲とする。
[Ti and / or Ti alloy (Ti conversion): 0.1 to 3.0% by mass]
Ti and Ti alloy are effective for stabilizing the toughness of the weld metal as in the case of Ni described above, and can be added as necessary. However, when the Ti content is less than 0.1% by mass in the coating agent, a sufficient toughness improving effect may not be obtained. On the other hand, when the Ti content exceeds 10.0% by mass, hot cracking is likely to occur. Therefore, in the low hydrogen-based coated arc welding rod of this embodiment, when Ti and / or a Ti alloy is added, the range is 0.1 to 3.0% by mass with respect to the total mass of the coating agent.
［Ｂ及び／又はＢ化合物：０．０１〜０．５０質量％］
Ｂ及びＢ化合物は、前述したＮｉ及びＴｉと同様に、溶接金属の靭性の安定化に有効であるため、必要に応じて添加することができる。しかしながら、Ｂの含有量が、被覆剤の中で、０．１質量％未満の場合、十分な靱性改善効果を得られない場合がある。一方で、Ｂの含有量が０．５０質量％を超えると、高温割れが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｂ及び／又はＢ合金を添加する場合は、被覆剤全質量あたり、０．０１〜０．５０質量％の範囲とする。
[B and / or B compound: 0.01 to 0.50 mass%]
B and B compounds are effective for stabilizing the toughness of the weld metal, as with Ni and Ti described above, and can be added as necessary. However, when the content of B is less than 0.1% by mass in the coating agent, a sufficient toughness improving effect may not be obtained. On the other hand, when the content of B exceeds 0.50% by mass, hot cracking is likely to occur. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, when B and / or B alloy is added, the range is 0.01 to 0.50% by mass with respect to the total mass of the coating agent.
［Ｍｏ：０．１〜６．０質量％］
Ｍｏは、溶接金属の強度の安定化に有効であるため、必要に応じて添加することができる。しかしながら、Ｍｏの含有量が、被覆剤の中で、０．１質量％未満の場合、十分な強度を確保することができない場合がある。一方で、Ｍｏの含有量が６．０質量％を超えると、強度が大きくなり過ぎ、靱性が劣化し、低温割れが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｍｏを添加する場合は、被覆剤全質量あたり、０．１〜６．０質量％の範囲とする。
[Mo: 0.1-6.0% by mass]
Since Mo is effective for stabilizing the strength of the weld metal, it can be added as necessary. However, if the Mo content is less than 0.1% by mass in the coating agent, sufficient strength may not be ensured. On the other hand, if the Mo content exceeds 6.0% by mass, the strength becomes too high, the toughness is deteriorated, and low temperature cracking is likely to occur. Therefore, in the low hydrogen-based coated arc welding rod of the present embodiment, when Mo is added, the range is 0.1 to 6.0% by mass with respect to the total mass of the coating agent.
［Ｃｒ：０．１〜１０．０質量％］
Ｃｒは、前述したＭｏと同様に、溶接金属の強度の安定化に有効であるため、必要に応じて添加することができる。しかしながら、Ｃｒの含有量が、被覆剤の中で、０．１質量％未満の場合、十分な強度を確保することができない場合がある。一方で、Ｃｒの含有量が１０．０質量％を超えると、強度が大きくなり過ぎ、靱性が劣化し、低温割れが発生しやすくなる。よって、本実施形態の低水素系被覆アーク溶接棒において、Ｃｒを添加する場合は、被覆剤全質量あたり、０．１〜１０．０質量％の範囲とする。
[Cr: 0.1 to 10.0% by mass]
Since Cr is effective for stabilizing the strength of the weld metal, as with Mo described above, it can be added as necessary. However, when the content of Cr is less than 0.1% by mass in the coating agent, sufficient strength may not be ensured. On the other hand, when the content of Cr exceeds 10.0% by mass, the strength becomes too large, the toughness is deteriorated, and low temperature cracking is likely to occur. Therefore, when adding Cr in the low hydrogen-based coated arc welding rod of the present embodiment, the range is 0.1 to 10.0% by mass per the total mass of the coating agent.
以上詳述したように、本実施形態の低水素系被覆アーク溶接棒は、被覆剤中の炭酸石灰及び蛍石の粒度を特定の範囲に規定し、ＭｇＯの発生を抑制するため、従来用いられている生産設備を変更することなく、拡散性水素量を低減することができる。その結果、溶接金属の耐割れ性を良好にすること等が可能となる。 As described above in detail, the low hydrogen-based coated arc welding rod of the present embodiment is conventionally used in order to regulate the particle size of lime carbonate and fluorite in the coating to a specific range and suppress the generation of MgO. The amount of diffusible hydrogen can be reduced without changing production facilities. As a result, it becomes possible to improve the crack resistance of the weld metal.
以下、本発明の実施例及び比較例を挙げて、本発明の効果について具体的に説明する。 Hereinafter, the effects of the present invention will be specifically described with reference to Examples and Comparative Examples of the present invention.
表１、表２に示す組成の被覆剤を、鋼心線（４．０ｍｍΦ×４００ｍｍＬ）の外周に所定の被覆率となるように塗布して被覆アーク溶接棒を製造した。なお、表１中、「被覆剤組成」では、被覆剤全質量あたりの各成分の含有量を示し、「被覆率」では、溶接棒全質量あたりの被覆剤の被覆率（被覆剤の質量（質量％）／溶接棒全質量（質量％））×１００を示す。また、表２中、含有量は、炭酸石灰、蛍石、又はＭｎの全質量あたりの含有量を示す。 The coating agent of the composition shown in Table 1 and Table 2 was applied to the outer periphery of the steel core wire (4.0 mmΦ × 400 mmL) so as to have a predetermined coverage, and a coated arc welding rod was manufactured. In Table 1, “Coating composition” indicates the content of each component per the total mass of the coating, and “Coating rate” indicates the coating rate of the coating per mass of the welding rod (the mass of the coating ( Mass%) / welding rod total mass (mass%)) × 100. Moreover, in Table 2, content shows content per total mass of lime carbonate, fluorite, or Mn.
得られた各溶接棒を用い、溶接金属中の拡散性水素量をＡＷＳ Ａ５．１及びＡ４．３に従って測定した。なお、溶接電流は１６０Ａｍｐとした。 Using each obtained welding rod, the amount of diffusible hydrogen in the weld metal was measured according to AWS A5.1 and A4.3. The welding current was 160 Amp.
また、Ｔ型すみ肉（母材：ＳＭ４９０Ａ、サイズ：１２Ｔ×７５Ｗ×４５０Ｌ）において立向上進姿勢で溶接（溶接電流：１３５〜１５５Ａｍｐ）を行い、溶接作業性を評価した。 In addition, welding (welding current: 135 to 155 Amp) was performed in a standing improvement posture in a T-shaped fillet (base material: SM490A, size: 12T × 75W × 450L), and welding workability was evaluated.
また、溶接部の靭性評価は、シャルピー衝撃試験（ＪＩＳ Ｚ ３２１１（ＡＷＳ Ａ５．１））により行った。溶接条件は溶接電流を１６０Ａｍｐとし、８層１６パスとした。 Moreover, the toughness evaluation of the welded part was performed by a Charpy impact test (JIS Z 3211 (AWS A5.1)). The welding conditions were a welding current of 160 Amp and 8 layers and 16 passes.
評価結果および試験結果を表３に示す。なお、溶接中のアークの強さ、アーク安定性、スラグの流動性、溶接後のスラグの剥離性、ビード形状については、目視による官能評価を行い、◎、○、△、×の４段階評価をした。拡散性水素量は、４ｍｌ／１００ｇ以下を◎とし、４ｍｌ／１００ｇを超えて５ｍｌ／１００ｇ以下を○とし、５ｍｌ／１００ｇを超えたものを×とした。靱性評価（−４０℃）は１００Ｊを超えたものを◎とし、５０Ｊ以上１００Ｊ未満のものを○とし、３０Ｊ以上５０Ｊ未満のものを△とし、３０Ｊ未満を×とした The evaluation results and test results are shown in Table 3. The strength of the arc during welding, arc stability, fluidity of slag, peelability of slag after welding, and bead shape are subjected to visual sensory evaluation, and are evaluated in four stages: ◎, ○, △, and ×. Did. The amount of diffusible hydrogen was evaluated as 、 ４ when 4 ml / 100 g or less, ◯ when exceeding 4 ml / 100 g and 5 ml / 100 g or less, and × when exceeding 5 ml / 100 g. The toughness evaluation (−40 ° C.) is ◎ when the value exceeds 100 J, ◯ when it is 50 J or more and less than 100 J, △ when it is 30 J or more and less than 50 J, and × when less than 30 J
表３に示すように、本発明の範囲内で作製した実施例１〜１２の溶接棒では、拡散性水素量を十分に低減できた。また、実施例１〜１２の溶接棒では、溶接作業性及び靱性にも優れていた。 As shown in Table 3, the amount of diffusible hydrogen could be sufficiently reduced in the welding rods of Examples 1 to 12 produced within the scope of the present invention. Moreover, the welding rods of Examples 1 to 12 were excellent in welding workability and toughness.
これに対して、表３に示すように、比較例１の溶接棒では、ＭｇＯの含有量が、本発明範囲の上限を超えていたため、拡散性水素量を十分に低減できなかった。比較例２の溶接棒では、Ｍｇの含有量が、本発明範囲の上限を超えていたため、拡散水素量を十分に低減できなかった。 On the other hand, as shown in Table 3, in the welding rod of Comparative Example 1, the MgO content exceeded the upper limit of the range of the present invention, and thus the amount of diffusible hydrogen could not be sufficiently reduced. In the welding rod of Comparative Example 2, since the Mg content exceeded the upper limit of the range of the present invention, the diffusion hydrogen amount could not be sufficiently reduced.
比較例３の溶接棒では、炭酸石灰における粒径が１０μｍ以下の粒子の含有量が、本発明範囲の下限未満であり、炭酸石灰の含有量が本発明範囲の上限を超えていたため、拡散水素量を十分に低減できなかった。また、比較例３の溶接棒では、スラグの流動性、スラグ剥離性及びビード形状も劣っていた。比較例４の溶接棒では、炭酸石灰の含有量が本発明範囲の下限未満であったため、拡散性水素量を十分に低減できなかった。また、比較例４の溶接棒では、靱性も劣っていた。 In the welding rod of Comparative Example 3, the content of particles having a particle size of 10 μm or less in lime carbonate was less than the lower limit of the range of the present invention, and the content of lime carbonate exceeded the upper limit of the range of the present invention. The amount could not be reduced sufficiently. Moreover, in the welding rod of the comparative example 3, the fluidity | liquidity of slag, the slag peelability, and the bead shape were also inferior. In the welding rod of Comparative Example 4, since the content of lime carbonate was less than the lower limit of the range of the present invention, the amount of diffusible hydrogen could not be sufficiently reduced. Further, the welding rod of Comparative Example 4 was inferior in toughness.
比較例５の溶接棒では、蛍石における粒径が１００μｍ以下の粒子の含有量が、本発明範囲の下限未満であり、蛍石の含有量が本発明範囲の下限未満であったため、拡散水素量を十分に低減できなかった。また、比較例５の溶接棒では、スラグの流動性、スラグ剥離性及びビード形状も劣っていた。比較例６の溶接棒では、蛍石の含有量が本発明範囲の上限を超えていたため、ビード形状が劣っていた。 In the welding rod of Comparative Example 5, the content of particles having a particle size of 100 μm or less in fluorite was less than the lower limit of the range of the present invention, and the content of fluorite was less than the lower limit of the range of the present invention. The amount could not be reduced sufficiently. Moreover, in the welding rod of the comparative example 5, the fluidity | liquidity of slag, the slag peelability, and the bead shape were also inferior. In the welding rod of Comparative Example 6, the bead shape was inferior because the content of fluorite exceeded the upper limit of the range of the present invention.
比較例７の溶接棒では、鉄粉の含有量が、本発明範囲の上限を超えていたため、アークの強さが劣っていた。 In the welding rod of Comparative Example 7, since the content of iron powder exceeded the upper limit of the range of the present invention, the strength of the arc was inferior.
比較例８の溶接棒では、ＳｉＯ２の含有量が、本発明範囲の下限未満であったため、アークの強さ、アーク安定性、スラグの流動性、スラグの剥離性、ビード形状及び靱性が劣っていた。一方、比較例９の溶接棒では、ＳｉＯ２の含有量が、本発明範囲の上限を超えていたため、拡散性水素量を十分に低減できなかった。また、比較例９の溶接棒では、スラグの剥離性及び靱性も劣っていた。 In the welding rod of Comparative Example 8, the content of SiO 2 was less than the lower limit of the range of the present invention, so the arc strength, arc stability, slag fluidity, slag peelability, bead shape and toughness were inferior. It was. On the other hand, in the welding rod of Comparative Example 9, the content of SiO 2 exceeded the upper limit of the range of the present invention, so that the amount of diffusible hydrogen could not be sufficiently reduced. Moreover, in the welding rod of Comparative Example 9, the slag peelability and toughness were also inferior.
比較例１０の溶接棒では、被覆剤の被覆率が、本発明範囲の下限未満であったため、アーク安定性が劣っていた。一方、比較例１１の溶接棒では、被覆剤の被覆率が、本発明範囲の上限を超えていたため、拡散性水素量を十分に低減できなかった。また、比較例１１の溶接棒では、スラグの流動性及びビード形状も劣っていた。 In the welding rod of Comparative Example 10, since the coating rate of the coating material was less than the lower limit of the range of the present invention, the arc stability was inferior. On the other hand, in the welding rod of Comparative Example 11, the amount of diffusible hydrogen could not be sufficiently reduced because the coating rate of the coating agent exceeded the upper limit of the range of the present invention. Moreover, in the welding rod of the comparative example 11, the fluidity | liquidity and bead shape of slag were also inferior.
以上の結果から、本発明の低水素系被覆アーク溶接棒を用いることにより、拡散性水素量を低減できることが確認された。 From the above results, it was confirmed that the amount of diffusible hydrogen can be reduced by using the low hydrogen-based coated arc welding rod of the present invention.
Claims (5)
前記被覆剤の被覆率が溶接棒全質量あたり２５〜４０質量％であり、
前記被覆剤は、
該被覆剤全質量あたり、
炭酸石灰：２３〜２６質量％、
蛍石：５〜２５質量％、
水ガラス、硅酸鉱物、金属Ｓｉ及びＳｉ合金からなる群から選択される少なくとも１種（ＳｉＯ２換算）：５〜２５質量％、
を含有すると共に、
ＭｇＯ及び／又はＭｇＣＯ３（ＭｇＯ換算）：０．１質量％以下、
金属Ｍｇ及び／又はＭｇ合金（Ｍｇ換算）：０．５質量％以下、
に規制され、
前記炭酸石灰は、粒径が１０μｍ以下の粒子が４０質量％以上であり、
前記蛍石は、粒径が１００μｍ以上の粒子が４０質量％以上である、低水素系被覆アーク溶接棒。 A low hydrogen-based arc welding rod in which a core wire made of carbon steel is coated with a coating agent,
The coating rate of the coating agent is 25 to 40% by mass with respect to the total mass of the welding rod,
The coating agent is
Per total mass of the coating,
Lime carbonate: 23-26 % by mass,
Fluorite: 5-25% by mass,
At least one selected from the group consisting of water glass, oxalic acid mineral, metal Si and Si alloy (in terms of SiO2): 5 to 25% by mass,
And containing
MgO and / or MgCO3 (MgO conversion): 0.1% by mass or less,
Metal Mg and / or Mg alloy (Mg conversion): 0.5% by mass or less,
Regulated by
The lime carbonate is 40% by mass or more of particles having a particle size of 10 μm or less,
The fluorite is a low hydrogen based arc welding rod in which particles having a particle size of 100 μm or more are 40% by mass or more.
Ｎｉ：０．１〜１０．０質量％、
Ｔｉ及び／又はＴｉ合金（Ｔｉ換算）：０．１〜３．０質量％、
Ｂ及び／又はＢ化合物（Ｂ換算）：０．０１〜０．５０質量％、
からなる群から選択される少なくとも１種を含有することを特徴とする、請求項１〜３の何れか１項に記載の低水素系被覆アーク溶接棒。 The coating further comprises, based on the total mass of the coating,
Ni: 0.1 to 10.0% by mass,
Ti and / or Ti alloy (Ti conversion): 0.1 to 3.0% by mass,
B and / or B compound (B conversion): 0.01 to 0.50% by mass,
The low hydrogen-based coated arc welding rod according to any one of claims 1 to 3, comprising at least one selected from the group consisting of:
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| JP6641084B2 (en) * | 2014-12-25 | 2020-02-05 | 株式会社神戸製鋼所 | Low hydrogen coated arc welding rod with excellent resistance to bar burn during welding |
| JP6437471B2 (en) * | 2015-04-24 | 2018-12-12 | 日鐵住金溶接工業株式会社 | Low hydrogen coated arc welding rod |
| JP6688344B2 (en) * | 2018-07-12 | 2020-04-28 | 株式会社神戸製鋼所 | Low-hydrogen coated arc welding rod |
| JP7084261B2 (en) * | 2018-09-11 | 2022-06-14 | 株式会社神戸製鋼所 | Shielded metal arc welding rod and shielded metal arc welding method |
| JP7210410B2 (en) * | 2019-09-26 | 2023-01-23 | 日鉄溶接工業株式会社 | Iron Powder Low Hydrogen Type Coated Arc Welding Rod |
| JP7239437B2 (en) * | 2019-10-04 | 2023-03-14 | 日鉄溶接工業株式会社 | Iron Powder Low Hydrogen Type Coated Arc Welding Rod |
| CN112743257A (en) * | 2019-10-31 | 2021-05-04 | 锦州宏达新材料有限公司 | Additive for welding rod coating |
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| JPS591155B2 (en) * | 1978-01-31 | 1984-01-10 | 株式会社神戸製鋼所 | coated arc welding rod |
| JPS5847954B2 (en) * | 1978-03-28 | 1983-10-25 | 新日本製鐵株式会社 | Low hydrogen coated arc welding rod |
| JPS5772796A (en) * | 1980-10-25 | 1982-05-07 | Nippon Steel Weld Prod & Eng Co Ltd | Production of coated electrode |
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| JP2005279767A (en) * | 2004-03-30 | 2005-10-13 | National Institute For Materials Science | Lime-based covered electrode, welding method and welded joint |
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