JP5361516B2 - Flux-cored wire for metal-based gas shielded arc welding for hardfacing - Google Patents
Flux-cored wire for metal-based gas shielded arc welding for hardfacing Download PDFInfo
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- JP5361516B2 JP5361516B2 JP2009107708A JP2009107708A JP5361516B2 JP 5361516 B2 JP5361516 B2 JP 5361516B2 JP 2009107708 A JP2009107708 A JP 2009107708A JP 2009107708 A JP2009107708 A JP 2009107708A JP 5361516 B2 JP5361516 B2 JP 5361516B2
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- 238000003466 welding Methods 0.000 title claims description 57
- 229910052751 metal Inorganic materials 0.000 title claims description 45
- 239000002184 metal Substances 0.000 title claims description 45
- 238000005552 hardfacing Methods 0.000 title claims description 15
- 230000004907 flux Effects 0.000 claims description 14
- 150000001339 alkali metal compounds Chemical class 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 9
- 229910000941 alkaline earth metal alloy Inorganic materials 0.000 claims description 9
- 150000001341 alkaline earth metal compounds Chemical class 0.000 claims description 9
- 239000010959 steel Substances 0.000 claims description 9
- 238000006243 chemical reaction Methods 0.000 claims description 8
- 229910052783 alkali metal Inorganic materials 0.000 claims description 7
- 150000001340 alkali metals Chemical class 0.000 claims description 7
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 7
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 7
- 229910052744 lithium Inorganic materials 0.000 claims description 4
- 229910052708 sodium Inorganic materials 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910052791 calcium Inorganic materials 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 229910052700 potassium Inorganic materials 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000011324 bead Substances 0.000 description 20
- 239000002893 slag Substances 0.000 description 15
- 230000000694 effects Effects 0.000 description 13
- 239000011651 chromium Substances 0.000 description 9
- 230000007547 defect Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 239000002585 base Substances 0.000 description 4
- 238000011156 evaluation Methods 0.000 description 4
- -1 LiF and NaF Chemical class 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 229910052804 chromium Inorganic materials 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 150000002222 fluorine compounds Chemical class 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 229910014458 Ca-Si Inorganic materials 0.000 description 1
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229910018068 Li 2 O Inorganic materials 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000009749 continuous casting Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000032798 delamination Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 229910000734 martensite Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 150000001247 metal acetylides Chemical class 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052720 vanadium Inorganic materials 0.000 description 1
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Description
本発明は、硬化肉盛溶接に使用され、ブローホール、ピットの発生および溶接割れなどの溶接欠陥がなく高品質な溶着金属が得られ、溶接中のスパッタの発生およびスラグの生成量が少なく、フラットなビード形状が得られる硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤに関する。 The present invention is used for hardfacing welding, and there is no weld defect such as blowhole, pit and weld crack, and a high-quality weld metal is obtained, and the generation of spatter and slag during welding is small. The present invention relates to a flux-cored wire for metal-based gas shielded arc welding for hardfacing that can obtain a flat bead shape.
製鉄・製鋼設備や土木建設機械など産業機械の各種部品には、耐摩耗性、耐熱性、耐食性などが要求されている。それら設備を安全に運転・維持するためには、全面または部分的に磨耗や剥離して寿命を迎えた部品を交換する必要がある。しかし、これらを廃棄して新たに作製すると償却費、作製費が膨大となりコスト高となる。磨耗や剥離した部位の補修手段として硬化肉盛溶接方法が広く採用されている。補修の硬化肉盛溶接は、従来から被覆アーク溶接棒が用いられてきたが、一般には設備作製時から部品表面に硬化肉盛溶接を施して高品質な肉盛層を形成させ長寿命化を図っている。また、溶接施工の高能率化の観点からセルフシールドアーク溶接方法、サブマージアーク溶接方法およびガスシールドアーク溶接方法での施工が一般的になってきている。 Wear resistance, heat resistance, corrosion resistance, and the like are required for various parts of industrial machines such as iron and steel making facilities and civil engineering machines. In order to operate and maintain these facilities safely, it is necessary to replace parts that have reached the end of their lives due to wear or delamination entirely or partially. However, if these are discarded and newly produced, depreciation and production costs become enormous and the cost increases. Hardening welding methods are widely used as repairing means for worn or peeled parts. For repaired overlay welding, covered arc welding rods have been used in the past, but in general, hardfacing welding is performed on the part surface from the time of production of the equipment to form a high-quality overlay layer to extend the life. I am trying. Further, from the viewpoint of improving the efficiency of welding construction, construction by a self-shielded arc welding method, a submerged arc welding method, and a gas shielded arc welding method has become common.
硬化肉盛溶接の技術は、例えば、特許文献１に高クロム鉄系の溶接材料で、高硬度で高耐剥離性が得られるサブマージ溶接材料について開示されている。しかし、サブマージ溶接の特性上多量のスラグが発生してスラグ除去のため常時人員を配置しての廃棄作業が必要となる。また、高電流での溶接は長時間の溶接を余儀なくされる圧延ロール等の肉盛溶接では、電力の消費が大きくなるなどコスト高となる。 For example, Patent Document 1 discloses a technique of hard overlay welding, which is a high-chromium iron-based welding material, which is a submerged welding material that has high hardness and high peel resistance. However, due to the characteristics of submerged welding, a large amount of slag is generated, and it is necessary to always dispose of personnel to remove the slag. In addition, welding at a high current is costly because, for example, overlay welding such as a rolling roll that requires long-time welding, power consumption is increased.
一方、特許文献２には、ガスシールアーク溶接における硬化肉盛用フラックス入りワイヤが開示されている。しかし、Ｂを添加しているため溶接割れの懸念は拭えない。また、スパッタが多量発生して溶接作業者の身体的負担になるばかりか、部品にスパッタが付着した場合は施工を中断して除去作業を強いられ溶接作業能率の低下を招く。さらに、形成されるビードも凸状になりやすく多パス多層盛の溶接を行うと、融合不良や溶け込み不良などの溶接欠陥が発生しやすく肉盛溶着金属の品質を劣化させるという問題もある。 On the other hand, Patent Document 2 discloses a flux-cored wire for hardfacing in gas seal arc welding. However, since B is added, there is no concern about welding cracks. Moreover, not only is a large amount of spatter generated and a physical burden on the welding operator, but if spatter adheres to a part, the construction is interrupted and the removal work is forced to cause a reduction in welding work efficiency. Furthermore, if the formed bead tends to be convex and multipass multi-layer welding is performed, there is a problem that welding defects such as poor fusion and poor penetration are likely to occur and the quality of the deposited metal is deteriorated.
本発明は、硬化肉盛溶接に使用され、ブローホール、ピットの発生および溶接割れなどの溶接欠陥がなく高品質な溶着金属が得られ、溶接中のスパッタの発生およびスラグの生成量が少なく、フラットなビード形状が得られる硬化肉盛用メタル系ガスシールド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。 The present invention is used for hardfacing welding, and there is no weld defect such as blowhole, pit and weld crack, and a high-quality weld metal is obtained, and the generation of spatter and slag during welding is small. An object of the present invention is to provide a flux-cored wire for metal-based gas shielded arc welding for hardfacing that can obtain a flat bead shape.
本発明者らは、前記課題を解決するためにフラックス入りワイヤを種々試作して、肉盛溶接に適用してアーク状態、スラグ生成量、ビード形状、溶着金属中の溶接欠陥の有無および溶着金属の硬さに及ぼす各成分組成の影響を調べた。 In order to solve the above-mentioned problems, the inventors have made various types of flux-cored wires and applied them to overlay welding so that the arc state, the slag generation amount, the bead shape, the presence or absence of welding defects in the weld metal, and the weld metal The effect of the composition of each component on the hardness of the rice was investigated.
その結果、メタル系フラックス入りワイヤとすることによってスラグ生成量を低減し、ＣｒおよびＣ量の調整さらにＮｉの添加により溶着金属の安定した硬さが得られ、またＳｉおよびＭｎ量の調整さらにＴｉの添加によって良好なビード形状が得られ、さらにアルカリ金属化合物およびアルカリ土類金属化合物および／またはアルカリ土類金属合金の適量添加によってアークが極めて安定してスパッタ発生量を低減することを見出して、本発明を完成した。 As a result, the amount of slag produced is reduced by using a metal-based flux-cored wire, the amount of Cr and C is adjusted, and the hardness of the deposited metal is stabilized by adding Ni. The amount of Si and Mn is further adjusted, and Ti is added. It has been found that a good bead shape can be obtained by the addition of, and that the arc is extremely stable and the amount of spatter generated can be reduced by adding an appropriate amount of alkali metal compound and alkaline earth metal compound and / or alkaline earth metal alloy, The present invention has been completed.
本発明の要旨は、鋼製外皮内にフラックスを充填してなる硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤにおいて、鋼製外皮およびフラックス中にワイヤ全質量に対して質量％で、
Ｃｒ：１１〜１５％、
Ｃ：０．０４〜０．１５％、
Ｓｉ：０．３〜１．５％、
Ｍｎ：０．４〜１．５％、
但し、
Ｍｎ／Ｓｉ：２以下、
Ｎｉ：１．５〜４．０％、
Ｌｉ、ＮａまたはＫのアルカリ金属化合物の１種または２種以上のアルカリ金属換算値の合計：０．００３〜０．００５％、
ＣａまたはＳｒのアルカリ土類金属化合物およびアルカリ土類金属合金の１種または２種のアルカリ土類金属換算値の合計：０．０７〜０．１２％
を含有し、残部は鋼製外皮のＦｅ分、合金鉄のＦｅ分および不可避的不純物からなることを特徴とする。
The gist of the present invention is a flux cored wire for metal cladding gas welding arc welding for hardfacing, in which a flux is filled in a steel outer sheath, and the steel outer sheath and the flux in mass% with respect to the total mass of the wire,
Cr: 11-15%,
C: 0.04 to 0.15%,
Si: 0.3 to 1.5%,
Mn: 0.4 to 1.5%
However,
Mn / Si: 2 or less,
Ni: 1.5-4.0%,
Total of one or more alkali metal conversion values of Li, Na or K alkali metal compounds: 0.003 to 0.005%,
Total of one or two kinds of alkaline earth metal converted value of Ca or Sr alkaline earth metal compounds and alkaline earth metal alloys: 0.07 to 0.12%
The balance is characterized by comprising the Fe content of the steel outer shell, the Fe content of the alloy iron and unavoidable impurities.
さらに、質量％で、Ｔｉ：０．０５〜０．３５％を含有することも特徴とする硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤにある。 Furthermore, it is in the flux-cored wire for metal-based gas shielded arc welding for hardfacing, characterized by containing Ti: 0.05 to 0.35% by mass%.
本発明の硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤによれば、硬化肉盛溶接に使用され、ブローホール、ピットの発生および溶接割れなどの溶接欠陥がなく高品質な溶着金属が得られ、溶接中のスパッタの発生およびスラグの生成量が少なく、フラットなビード形状が得られる硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤを提供することができる。 According to the metal cored gas shielded arc welding flux cored wire of the present invention, it is used for hardfacing welding, and there is no weld defect such as blowhole, pit generation and weld cracking, and high quality weld metal Thus, it is possible to provide a flux-cored wire for metal cladding gas welding for hardfacing, in which generation of spatter during welding and generation of slag are small, and a flat bead shape is obtained.
以下、本発明の実施の形態について説明する。 Embodiments of the present invention will be described below.
本発明は、メタル系フラックス入りワイヤとすることによってスラグ生成量を低減し、ＣｒおよびＣ量の調整さらにＮｉの添加により溶着金属の安定した硬さが得られ、またＳｉおよびＭｎ量の調整さらにＴｉの添加によって良好なビード形状が得られ、さらにアルカリ金属化合物およびアルカリ土類金属化合物および／またはアルカリ土類金属合金の適量添加によってアークが極めて安定してスパッタ発生量を低減することを見出し、硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤの成分組成を決定したものである。 The present invention reduces the amount of slag generation by using a metal-based flux-cored wire, adjusts the Cr and C amounts, adds Ni to provide a stable hardness of the deposited metal, and adjusts the Si and Mn amounts. It has been found that a good bead shape is obtained by the addition of Ti, and that the arc is extremely stable and the spatter generation amount is reduced by adding an appropriate amount of an alkali metal compound and an alkaline earth metal compound and / or an alkaline earth metal alloy, The component composition of the flux-cored wire for metal-based gas shielded arc welding for hardfacing is determined.
まず、本発明の硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤの成分組成の限定理由について説明する。ここで、成分についての％は質量％を意味する。 First, the reason for limitation of the component composition of the flux-cored wire for metal-based gas shielded arc welding for hardfacing according to the present invention will be described. Here,% regarding a component means the mass%.
Ｃｒ：１１〜１５％
Ｃｒは、溶着金属の硬さを確保するための主要な元素である。また、形成された溶着金属が連続鋳造ラインの圧延ロールのような高温および酸化環境での使用を想定した場合、高温強度および耐食性を確保する上でも必須である。Ｃｒが１１％未満であると、この効果が期待できない。一方、１５％を超えると、溶着金属の延性が低下して溶接割れが発生しやすくなる。
Cr: 11-15%
Cr is a main element for ensuring the hardness of the deposited metal. Further, when it is assumed that the formed weld metal is used in a high temperature and oxidizing environment such as a rolling roll of a continuous casting line, it is essential to ensure high temperature strength and corrosion resistance. If Cr is less than 11%, this effect cannot be expected. On the other hand, if it exceeds 15%, the ductility of the deposited metal is lowered and weld cracks are likely to occur.
Ｃ：０．０４〜０．１５％
Ｃは、Ｃｒと炭化物を生成して溶着金属の硬さを高める効果がある。Ｃが０．０４％未満であると、溶着金属の硬さが低くなる。一方、０．１５％を超えると、溶着金属の延性が低下して溶接割れが発生しやすくなる。また、微小なブローホールが発生する。
C: 0.04 to 0.15%
C has the effect of generating Cr and carbides and increasing the hardness of the deposited metal. When C is less than 0.04%, the hardness of the weld metal is lowered. On the other hand, if it exceeds 0.15%, the ductility of the deposited metal is lowered and weld cracks are likely to occur. In addition, minute blow holes are generated.
Ｓｉ：０．３〜１．５％
Ｓｉは、脱酸剤として効果があり、アークの安定性やビード形状を良化させる作用も有する。Ｓｉが０．３％未満であると、アークが不安定でブローホールやピットが発生しやすくなる。一方、１．５％を超えると、酸化物として粒界に偏析して脆弱化させて延性が低下して溶接割れが発生しやすくなる。
Si: 0.3 to 1.5%
Si is effective as a deoxidizer, and also has an effect of improving arc stability and bead shape. If Si is less than 0.3%, the arc is unstable and blow holes and pits are likely to occur. On the other hand, if it exceeds 1.5%, the oxide segregates at the grain boundary and becomes brittle, the ductility is lowered and weld cracks are likely to occur.
Ｍｎ：０．４〜１．５％
Ｍｎは、Ｓｉと同様に脱酸剤として効果があり、高融点のＭｎＳを形成して高温割れ抑制にも有効である。Ｍｎが０．４％未満では、割れが生じたり、ブローホールやピットが発生したりしやすくなる。一方、１．５％を超えると、ビード形状が凸になりやすくなる。
Mn: 0.4 to 1.5%
Mn is effective as a deoxidizing agent like Si, and is effective in suppressing high-temperature cracking by forming high melting point MnS. If Mn is less than 0.4%, cracks or blow holes or pits are likely to occur. On the other hand, if it exceeds 1.5%, the bead shape tends to be convex.
Ｍｎ／Ｓｉ：２以下
Ｍｎ／Ｓｉは、ビード形状に大きく影響する。Ｍｎ／Ｓｉが２を超えるとビード形状が凸となる。
Mn / Si: 2 or less Mn / Si greatly affects the bead shape. When Mn / Si exceeds 2, the bead shape becomes convex.
Ｎｉ：１．５〜４．０％
Ｎｉは、溶着金属組織のマトリックスを安定させ溶着金属の硬さを安定させる効果がある。Ｎｉが１．５％未満では、溶着金属の硬さが低くなる。一方、４．０％を超えると、マルテンサイトに比べ軟質なオーステナイトが析出して硬さが低下する。また、Ｐ、Ｓ等の割れに有害な微量成分の偏析を促進して溶接割れが発生しやすくなる。
Ni: 1.5-4.0%
Ni has an effect of stabilizing the matrix of the weld metal structure and stabilizing the hardness of the weld metal. When Ni is less than 1.5%, the hardness of the weld metal is low. On the other hand, if it exceeds 4.0%, soft austenite is precipitated as compared with martensite, and the hardness decreases. In addition, segregation of trace components that are harmful to cracks such as P and S is promoted, and weld cracks are likely to occur.
アルカリ金属化合物の１種または２種以上のアルカリ金属換算値の合計：０．００３〜０．００５％
アルカリ金属化合物は、微量でアークの安定性とアーク集中性を高める効果がある。アルカリ金属化合物の１種または２種以上のアルカリ金属換算値の合計が０．００３％未満では、アークが不安定でスパッタ発生量が多くなる。一方、０．００５％を超えると、アークの集中性が強すぎてスパッタ発生量が多くなる。
Total of one or more alkali metal conversion values of alkali metal compounds: 0.003 to 0.005%
Alkali metal compounds have the effect of improving the stability and arc concentration of the arc in a small amount. When the total of one or more alkali metal conversion values of the alkali metal compounds is less than 0.003%, the arc is unstable and the amount of spatter generated increases. On the other hand, if it exceeds 0.005%, the arc concentration is too strong and the amount of spatter generated increases.
アルカリ金属は、Ｌｉ、Ｎａ、Ｋ等があり、ＬｉＦおよびＮａＦ等の弗素化合物、Ｌｉ2Ｏ、Ｎａ2ＯおよびＫ2Ｏ等の酸化物、Ｌｉ2ＣＯ3、Ｎａ2ＣＯ3およびＫ2ＣＯ3等の炭酸塩の形態で添加する。いずれの形態で添加しても同様の効果が得られる。 Alkali metals include Li, Na, K and the like, fluorine compounds such as LiF and NaF, oxides such as Li 2 O, Na 2 O and K 2 O, Li 2 CO 3 , Na 2 CO 3 and K 2 CO. Add in the form of 3rd grade carbonate. The same effect can be obtained even if added in any form.
アルカリ土類金属化合物およびアルカリ土類金属合金の１種または２種以上のアルカリ土類金属換算値の合計：０．０７〜０．１２％
アルカリ土類金属化合物およびアルカリ土類金属合金は、アルカリ金属化合物と同様にアーク安定性を高めるほか、脱酸効果がある。アルカリ土類金属化合物およびアルカリ土類金属合金の１種または２種以上のアルカリ土類金属換算値の合計が０．０７％未満であると、アークが不安定でブローホールやピットが発生しやすくなる。一方、０．１２％を超えると、スラグ生成量が多くなる。
Total of one or more alkaline earth metal conversion values of alkaline earth metal compound and alkaline earth metal alloy: 0.07 to 0.12%
Alkaline earth metal compounds and alkaline earth metal alloys have a deoxidizing effect in addition to improving arc stability in the same manner as alkali metal compounds. If the total of one or more alkaline earth metal equivalents of alkaline earth metal compounds and alkaline earth metal alloys is less than 0.07%, the arc is unstable and blowholes and pits are likely to occur. Become. On the other hand, when it exceeds 0.12%, the amount of slag generation increases.
アルカリ土類金属は、Ｃａ、Ｓｒ等があり、ＣａＦ ２ 、ＳｒＦ ２ 等の弗素化合物、Ｃａ−Ｓｉ、Ｃａ−Ｎｉ等の合金、ＣａＣＯ３およびＳｒＣＯ３等の炭酸塩の形態で添加する。いずれの形態で添加しても同様な効果が得られる。 Alkaline earth metals include Ca and Sr, and are added in the form of fluorine compounds such as CaF 2 and SrF 2 , alloys such as Ca—Si and Ca— Ni , and carbonates such as Ca CO 3 and SrCO 3 . The same effect can be obtained even if added in any form.
Ｔｉ：０．０５〜０．３５％
Ｔｉは、脱酸効果があり、アーク安定性およびビード形状を良化させる作用もあるので、選択的に添加することができる。Ｔｉが０．０５％未満では、これら効果は不十分である。一方、０．３５％を超えると、アーク吹付け力が過剰となりスパッタ発生量が多くなるとともにスラグ生成量が増加する。
なお、本発明の硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤにおいては、上記成分以外の成分組成は特に規定されない。従って溶着金属の硬さ、耐食性および溶接作業性を考慮してＭｏ、Ｖ、Ｎｂ等の組成を種々に調整できる。しかし、高温割れを助長するＰおよびＳはできるだけ少ないのが好ましく、Ｐ＋Ｓで０．０４５％以下であることが好ましい。
Ti: 0.05 to 0.35%
Ti has a deoxidizing effect and also has an effect of improving arc stability and bead shape, and thus can be selectively added. If Ti is less than 0.05%, these effects are insufficient. On the other hand, if it exceeds 0.35%, the arc spraying force becomes excessive, the amount of spatter generation increases, and the amount of slag generation increases.
In addition, in the flux-cored wire for metal-based gas shielded arc welding for hardfacing of the present invention, the component composition other than the above components is not particularly defined. Accordingly, the composition of Mo, V, Nb, etc. can be variously adjusted in consideration of the hardness, corrosion resistance and welding workability of the weld metal. However, P and S that promote hot cracking are preferably as small as possible, and P + S is preferably 0.045% or less.
フラックスの充填率は特に限定はしないが、溶接作業性の安定および溶接金属の機械的性質を考慮して、ワイヤ全質量対し１８％以上、ワイヤ製造時の断線等を防止するため２８％以下であることが好ましい。 The filling rate of the flux is not particularly limited, but considering the stability of welding workability and the mechanical properties of the weld metal, it is 18% or more with respect to the total mass of the wire, and 28% or less in order to prevent disconnection during wire production. Preferably there is.
溶接時のシールドガスは、スラグ生成量を低減するためにＡｒ−５〜２５％の混合ガスとする。 The shielding gas at the time of welding is Ar-5 to 25% mixed gas in order to reduce the amount of slag generation.
また、フラックス入りワイヤの断面形状例を図１に示す。図１（ａ）の形状例に示すように、外皮１内にフラックス２を内包した合わせ目３がなくとも、また、図１（ｂ）〜（ｄ）に示すように合わせ目３がある形状のフラックス入りワイヤであっても、本発明ではいずれも使用することができる。
Moreover, the cross-sectional shape example of a flux cored wire is shown in FIG. As shown in the shape example of FIG. 1 (a), even if there is no
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 effect of the present invention will be described in more detail with reference to examples.
表１に示す化学成分の鋼製外皮を用いて、表２に示す成分のメタル系フラックス入りワイヤを各種試作した。ワイヤ径は１．６ｍｍであり、またフラックス充填率は１８〜２８％とした。 Various metal-based flux-cored wires having the components shown in Table 2 were made using a steel outer sheath having the chemical components shown in Table 1. The wire diameter was 1.6 mm, and the flux filling rate was 18 to 28%.
表２のワイヤと表３に示すＪＩＳ Ｇ３１０６ＳＭ４９０Ａ鋼板（板厚２０ｍｍ）を用いて溶接作業性、溶着金属の溶接欠陥および硬さを調査した。 Using the wires in Table 2 and the JIS G3106SM490A steel plate (plate thickness 20 mm) shown in Table 3, welding workability, weld defects and hardness of the deposited metal were investigated.
溶接作業性評価試験は、下向き姿勢溶接のビードオンプレートで、表４に示す溶接条件にて行った。なお、溶接作業性は、アークの安定性、スパッタの発生量、スラグ生成量およびビード形状を観察することにより評価した。スパッタ発生量は、スパッタの飛散状況および母材へのスパッタ付着状況より評価した。また、ビード形状については、図２に示す母材４表面から母材４と溶接金属５との接点から溶接金属５表面に沿って引いた接線６とのフランク角θを測定し、フランク角θが１２０°以上を良好とした。
The welding workability evaluation test was carried out under the welding conditions shown in Table 4 using a bead-on-plate with downward posture welding. The welding workability was evaluated by observing arc stability, spatter generation amount, slag generation amount, and bead shape. The amount of spatter generated was evaluated from the state of spatter scattering and the state of spatter adhesion to the base material. For the bead shape, the flank angle θ between the surface of the
溶着金属の溶接欠陥評価試験は、表３に示すＳＭ４９０Ａ鋼板を使用し、ＪＩＳ Ｚ３１１４に準拠し、下向き溶接姿勢で表４に示す溶接条件にて４層肉盛溶接を行った。溶接割れの評価は、溶着金属表面を２ｍｍ切削し、浸透深傷試験を実施し、溶接割れがないものを良好と評価した。ブローホールおよびピットの評価は、溶着金属の断面を目視にて観察し、ブローホールおよびピットが観察されていないものを良好と評価した。
溶着金属の硬さ評価試験は、溶接欠陥評価後の試験板をＪＩＳ Ｚ３１１４およびＪＩＳ Ｚ２２４４に準拠してビッカース硬さを測定し、１０点の平均が３５０〜５００Ｈｖを良好とした。
In the weld defect evaluation test for the weld metal, SM490A steel plate shown in Table 3 was used, and in accordance with JIS Z3114, 4-layer overlay welding was performed under the welding conditions shown in Table 4 in a downward welding posture. The weld crack was evaluated by cutting the weld metal surface by 2 mm, conducting a penetration depth test, and evaluating that there was no weld crack as good. The blowholes and pits were evaluated by visually observing the cross section of the weld metal, and evaluating no good blowholes and pits.
In the hardness evaluation test for the weld metal, the Vickers hardness of the test plate after the weld defect evaluation was measured in accordance with JIS Z3114 and JIS Z2244, and the average of 10 points was good at 350 to 500 Hv.
表２および表５中ワイヤ記号Ｓ１〜Ｓ１０が本発明例、ワイヤ記号Ｓ１１〜Ｓ１９は比較例である。本発明例であるワイヤ記号Ｓ１〜Ｓ１０は、メタル系フラックス入りワイヤの各成分組成量が適正であるので、アークが安定でスパッタ発生量およびスラグ生成量が少なく、ビード形状もフランク角度θが大きく良好で溶接作業性が良好で、溶接割れおよびブローホールやピットなどの溶接欠陥がなく、溶着金属の硬さも高く極めて満足な結果であった。 In Tables 2 and 5, wire symbols S1 to S10 are examples of the present invention, and wire symbols S11 to S19 are comparative examples. In the wire symbols S1 to S10, which are examples of the present invention, the composition amount of each component of the metal-based flux-cored wire is appropriate, so the arc is stable, the amount of spatter generation and slag generation is small, and the bead shape also has a large flank angle θ. The welding workability was good, there were no welding cracks, no welding defects such as blow holes and pits, and the hardness of the deposited metal was high, which was a very satisfactory result.
比較例中ワイヤ記号Ｓ１１は、Ｃが多いので割れおよびブローホールが生じた。また、アルカリ金属化合物のアルカリ金属換算値の合計量が多いのでスパッタ発生量が多かった。 Since the wire symbol S11 in the comparative example had many Cs, cracks and blowholes occurred. Moreover, since the total amount of alkali metal conversion values of the alkali metal compound is large, the amount of spatter generated was large.
ワイヤ記号Ｓ１２は、Ｃが少ないので硬さが低かった。また、Ｍｎ／Ｓｉが高いのでビード形状が凸でフランク角θが小さかった。 The wire symbol S12 had a low hardness because of a small amount of C. Further, since Mn / Si was high, the bead shape was convex and the flank angle θ was small.
ワイヤ記号Ｓ１３は、Ｓｉが多いので割れが生じた。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。 The wire symbol S13 was cracked because of a large amount of Si. Moreover, since there was much Ti, there was much spatter generation amount and slag generation amount.
ワイヤ記号Ｓ１４は、Ｓｉが少ないのでアークが不安定でビード形状が凸でフランク角θが小さくブローホールも発生した。また、Ｎｉが多いので硬さが低かった。 In the wire symbol S14, since the amount of Si is small, the arc is unstable, the bead shape is convex, the flank angle θ is small, and blow holes are also generated. Moreover, since there was much Ni, hardness was low.
ワイヤ記号Ｓ１５は、Ｍｎが少ないので割れおよびブローホールが生じた。また、Ｔｉが少ないのでアークがやや不安定でビード形状がやや凸でフランク角θもやや小さかった。 Since the wire symbol S15 had a small amount of Mn, cracks and blowholes occurred. Further, since Ti was small, the arc was slightly unstable, the bead shape was slightly convex, and the flank angle θ was slightly small.
ワイヤ記号Ｓ１６は、Ｃｒが多いので割れが生じた。また、アルカリ金属化合物のアルカリ金属換算値の合計量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。 The wire symbol S16 was cracked because of a large amount of Cr. Also, since the total amount of alkali metal equivalents of the alkali metal compound was small, the arc was unstable and the amount of spatter generated was large.
ワイヤ記号Ｓ１７は、Ｃｒが少ないので硬さが低かった。また、Ｍｎが多いのでビード形状が凸でフランク角θが小さかった。 The wire symbol S17 had a low hardness due to a small amount of Cr. Further, since Mn was large, the bead shape was convex and the flank angle θ was small.
ワイヤ記号Ｓ１８は、Ｎｉが少ないので硬さが低かった。また、アルカリ土類金属化合物およびアルカリ土類金属合金のアルカリ土類金属換算値の合計量が多いのでスラグ生成量が多かった。 The wire symbol S18 had a low hardness due to a small amount of Ni. Moreover, since the total amount of alkaline earth metal conversion values of the alkaline earth metal compound and the alkaline earth metal alloy was large, the amount of slag produced was large.
ワイヤ記号Ｓ１９は、Ｍｎ／Ｓｉが高いのでビード形状が凸でフランク角θが小さかった。また、アルカリ土類金属化合物およびアルカリ土類金属合金のアルカリ土類金属換算値の合計量が少ないのでアークが不安定でブローホールも生じた。 The wire symbol S19 had a high Mn / Si, so that the bead shape was convex and the flank angle θ was small. Further, since the total amount of alkaline earth metal conversion values of the alkaline earth metal compound and the alkaline earth metal alloy was small, the arc was unstable and blowholes were generated.
１ 外皮
２ フラックス
３ 合わせ目
４ 母材
５ 溶接金属
６ 接線
θ フランク角
1 outer skin 2
Claims (2)
Ｃｒ：１１〜１５％、
Ｃ：０．０４〜０．１５％、
Ｓｉ：０．３〜１．５％、
Ｍｎ：０．４〜１．５％、
但し、
Ｍｎ／Ｓｉ：２以下、
Ｎｉ：１．５〜４．０％、
Ｌｉ、ＮａまたはＫのアルカリ金属化合物の１種または２種以上のアルカリ金属換算値の合計：０．００３〜０．００５％、
ＣａまたはＳｒのアルカリ土類金属化合物およびアルカリ土類金属合金の１種または２種のアルカリ土類金属換算値の合計：０．０７〜０．１２％
を含有し、残部は鋼製外皮のＦｅ分、合金鉄のＦｅ分および不可避的不純物からなることを特徴とする硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤ。 In a metal-based gas shielded arc welding flux cored wire for flux welding, which is filled with a flux in the steel outer sheath, in the steel outer sheath and the flux in mass% with respect to the total mass of the wire,
Cr: 11-15%,
C: 0.04 to 0.15%,
Si: 0.3 to 1.5%,
Mn: 0.4 to 1.5%
However,
Mn / Si: 2 or less,
Ni: 1.5-4.0%,
Total of one or more alkali metal conversion values of Li, Na or K alkali metal compounds: 0.003 to 0.005%,
Total of one or two kinds of alkaline earth metal converted value of Ca or Sr alkaline earth metal compounds and alkaline earth metal alloys: 0.07 to 0.12%
A balance-cored metal-based gas shielded arc-welded flux-cored wire, characterized in that the balance is composed of the Fe content of the steel outer shell, the Fe content of the alloy iron, and inevitable impurities.
Ｔｉ：０．０５〜０．３５％
を含有することを特徴とする請求項１に記載の硬化肉盛用メタル系ガスシールドアーク溶接用フラックス入りワイヤ。 Furthermore, in mass%,
Ti: 0.05 to 0.35%
The flux-cored wire for metal-based gas shielded arc welding for hardfacing according to claim 1, comprising:
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