JP2019171399A - Low-hydrogen type coated electrode - Google Patents
Low-hydrogen type coated electrode Download PDFInfo
- Publication number
- JP2019171399A JP2019171399A JP2018060211A JP2018060211A JP2019171399A JP 2019171399 A JP2019171399 A JP 2019171399A JP 2018060211 A JP2018060211 A JP 2018060211A JP 2018060211 A JP2018060211 A JP 2018060211A JP 2019171399 A JP2019171399 A JP 2019171399A
- Authority
- JP
- Japan
- Prior art keywords
- total
- metal
- welding
- arc
- value
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Nonmetallic Welding Materials (AREA)
Abstract
Description
本発明は、立向下進溶接においてアークの安定性及び耐棒焼け性に優れ、溶接金属の強度及び低温での靱性が優れる低水素系被覆アーク溶接棒に関するものである。 The present invention relates to a low hydrogen-coated arc welding rod which is excellent in arc stability and rod burn resistance in vertical downward welding, and has excellent weld metal strength and low temperature toughness.
低水素系被覆アーク溶接棒は、優れた機械的性質を有する溶接金属が得られることから幅広く使用されている。一方、この低水素系被覆アーク溶接棒は、イルミナイト系溶接棒やライムチタニヤ系溶接棒と比較して、アークの安定性に欠け、溶融速度が遅い、ビードが伸びない、凸ビードになるなど溶接作業性が悪いという欠点をもっている。特に立向下進溶接においては、高電流溶接が常用されており、高電流の溶接条件で溶接すると、深い溶け込みが得られ溶接作業能率が向上する反面、溶接棒の後半部において鋼心線が発熱し、被覆剤が焼けた状態、即ち、棒焼け現象（以下、棒焼けという。）を起こし易くなる欠点がある。この棒焼けを生じた溶接棒を使用すると、溶接時にアークが不安定となり、溶接作業性の劣化を招くばかりかブローホールや溶け込み不足などの溶接欠陥が発生する。 Low hydrogen-based coated arc welding rods are widely used because a weld metal having excellent mechanical properties can be obtained. On the other hand, this low hydrogen coated arc welding rod has poor arc stability, melting rate is slow, bead does not stretch, and convex bead compared to illuminite welding rod and lime titania welding rod. It has the disadvantage of poor workability. Especially in vertical down welding, high current welding is commonly used. When welding under high current welding conditions, deep penetration is obtained and welding work efficiency is improved. There is a drawback that heat is generated and the coating is burnt, that is, a bar burn phenomenon (hereinafter referred to as bar burn) is likely to occur. When a welding rod with such bar burn is used, the arc becomes unstable during welding, causing welding workability to deteriorate and welding defects such as blow holes and insufficient penetration.
近年では、更なる溶接作業能率及び溶接部の品質向上が要求されることから、良好な機械的性能の溶接金属を維持しつつ、アークの安定性に優れ、アークの吹付けが好適な立向下進溶接用の低水素系被覆アーク溶接棒が要望されており、種々の提案がされている。 In recent years, further improvement in welding work efficiency and weld quality has been demanded. Therefore, while maintaining a weld metal with good mechanical performance, it has excellent arc stability and is suitable for arc spraying. There is a demand for a low hydrogen-based coated arc welding rod for downward welding, and various proposals have been made.
例えば、特許文献１には、被覆アーク溶接棒の被覆剤中の成分組成及び焼成後の嵩密度を規定することで溶接中の被覆の脱落を防止し、優れたアークの安定性とシールド効果を得る技術が開示されている。 For example, Patent Document 1 specifies the component composition in the coating of a coated arc welding rod and the bulk density after firing to prevent the coating from falling off during welding, and has excellent arc stability and shielding effect. Obtaining techniques are disclosed.
また、特許文献２には、被覆アーク溶接棒の被覆剤中のＶの含有量を規定することで、
溶接金属の耐割れ性を向上させる技術が開示されている。
Moreover, in patent document 2, by prescribing the content of V in the coating agent of the coated arc welding rod,
A technique for improving the crack resistance of a weld metal is disclosed.
しかしながら、これら特許文献１及び特許文献２に記載の被覆アーク溶接棒では、従来からの低水素系被覆アーク溶接棒の問題点とされてきたアークの安定性、溶接金属の機械的性能を改善できるものの、耐棒焼け性を向上させることは困難であった。 However, these coated arc welding rods described in Patent Document 1 and Patent Document 2 can improve the arc stability and the mechanical performance of the weld metal, which have been the problems of conventional low hydrogen-based coated arc welding rods. However, it was difficult to improve the anti-sticking property.
さらに、特許文献３には、固着剤としての水ガラスにおけるＳｉＯ2／Ｎａ2Ｏのモル比を２．８〜３．８とした高モル比水ガラスを用いることによって棒焼けを防止する技術が開示されている。ところが、水ガラスのモル比を高くすると、製造時に乾燥割れが生じ、またＮａ2ＯやＫ2Ｏなどのアルカリ金属酸化物の含有量が少なくなるのでアーク状態が劣化しスパッタの飛散が多くなるという問題点があった。 Furthermore, Patent Document 3 discloses a technique for preventing bar burn by using a high molar ratio water glass having a SiO 2 / Na 2 O molar ratio of 2.8 to 3.8 in water glass as a fixing agent. It is disclosed. However, when the molar ratio of water glass is increased, dry cracking occurs during production, and since the content of alkali metal oxides such as Na 2 O and K 2 O decreases, the arc state deteriorates and spattering increases. There was a problem.
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、特に立向下進溶接においてアークの安定性に優れ、好適なアークの吹付けが得られ、ビード形状及び耐棒焼け性が良好で、機械的性能に優れた溶接金属が得られる低水素系被覆アーク溶接棒を提供することを目的とする。 The present invention has been devised in view of the above-mentioned problems, and is particularly excellent in arc stability in vertical downward welding, and can provide a suitable arc spray, bead shape, and rod burn resistance. An object of the present invention is to provide a low hydrogen-based coated arc welding rod in which a weld metal having good mechanical properties is obtained.
本発明の要旨は、鋼心線に被覆剤が被覆されている低水素系被覆アーク溶接棒において、鋼心線に被覆剤が塗布されている低水素系被覆アーク溶接棒において、前記被覆剤は、当該被覆剤全質量に対する質量％で、金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計：３〜１０％、金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計：１〜５％、Ｔｉ酸化物のＴｉＯ2換算値の合計：１〜３％、Ｓｉ酸化物のＳｉＯ2換算値の合計：３〜８％、金属炭酸塩の１種または２種以上の合計：４０〜５５％、金属弗化物のＦ換算値の合計：１〜５％、有機物の１種または２種以上の合計：０．１〜２．０％、鉄粉：１０〜３０％、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計：１〜５％を含有し、残部は、塗装剤、鉄合金からのＦｅ分及び不可避不純物からなることを特徴とする低水素系被覆アーク溶接棒である。 The gist of the present invention is a low hydrogen-based coated arc welding rod in which a coating is applied to a steel core wire, and the low hydrogen-based coated arc welding rod in which a coating is applied to a steel core, wherein the coating is , In mass% with respect to the total mass of the coating agent, the total of Si conversion values of metal Si and Si alloy: 3 to 10%, the total of Mn conversion values of metal Mn and Mn alloy: 1 to 5%, TiO of Ti oxide 2 Total of converted values: 1 to 3%, Total of SiO 2 converted values of Si oxide: 3 to 8%, Total of one or more metal carbonates: 40 to 55%, F of metal fluoride Total of converted values: 1 to 5%, total of one or more organic substances: 0.1 to 2.0%, iron powder: 10 to 30%, Na 2 O converted value of Na compound and K compound, and Total of K 2 O conversion value: 1 to 5%, the balance is paint, iron content from iron alloy and unavoidable It is a low hydrogen-based coated arc welding rod characterized by comprising impurities.
本発明の低水素系被覆アーク溶接棒によれば、特に立向下進溶接において良好なアーク安定性、好適なアークの吹付けが得られるなど優れた溶接作業性を確保することができ、ビード形状、耐棒焼け性が良好で、機械的性能に優れた溶接金属を得ることができる。このため、溶接作業能率の向上及び溶接部の品質向上に大いに貢献できる。 According to the low hydrogen-based coated arc welding rod of the present invention, it is possible to ensure excellent welding workability such as good arc stability and favorable arc spraying particularly in vertical down welding, It is possible to obtain a weld metal having a good shape and anti-bare resistance and excellent mechanical performance. For this reason, it can greatly contribute to the improvement of the welding work efficiency and the quality of the welded portion.
本発明者らは、上記課題を解決するために、低水素系被覆アーク溶接棒を作製し、立向下進溶接において溶接作業性及び溶接金属の機械的性能を改善するべく、まずは耐棒焼け性について詳細に調査した。その結果、立向下進の溶接では、高電流で溶接を行うため溶接熱によって溶接棒が赤熱しやすいため、金属炭酸塩の含有量及び有機物の含有量を適正とし、吸熱反応を早くさせることにより、棒焼けを防止できることを見出した。 In order to solve the above-mentioned problems, the present inventors made a low hydrogen-based coated arc welding rod, and in order to improve the welding workability and the mechanical performance of the weld metal in vertical downward welding, The sex was investigated in detail. As a result, in vertical and downward welding, the welding rod is easily red-hot due to the welding heat, so the metal carbonate content and organic content are appropriate and the endothermic reaction is accelerated. Thus, it was found that stick burning can be prevented.
また、アークの安定性は、被覆剤中のＴｉＯ2及びＮａ化合物及びＫ化合物といったアーク安定剤の各含有量を適正にすることで改善できることを見出した。 Further, it has been found that the stability of the arc can be improved by making each content of the arc stabilizers such as TiO 2, Na compound and K compound in the coating material appropriate.
溶接金属の機械的性能については、被覆剤中のＳｉ及びＭｎの含有量を適正とし、溶接金属中に適量のＳｉ及びＭｎを歩留まらせることで、溶接金属の機械的性能を改善できることを見出した。 As for the mechanical performance of the weld metal, we found that the mechanical performance of the weld metal can be improved by making the Si and Mn contents in the coating material appropriate and allowing the proper amount of Si and Mn to be produced in the weld metal. It was.
以下、本発明を適用した低水素系被覆アーク溶接棒の被覆剤中の成分組成と、その成分組成の限定理由について詳細に説明する。なお、各成分組成の含有量は、被覆剤全質量に対する質量％で表すこととし、その質量％を表すときには単に％と記載することとする。 Hereinafter, the component composition in the coating material of the low hydrogen-based coated arc welding rod to which the present invention is applied and the reason for limiting the component composition will be described in detail. The content of each component composition is expressed as mass% with respect to the total mass of the coating agent, and when expressing the mass%, it is simply described as%.
［金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計：３〜１０％］
Ｓｉは、金属Ｓｉ、Ｆｅ−Ｓｉ、Ｆｅ−Ｓｉ−Ｍｎ等のＳｉ合金から添加され、溶接金属の脱酸を目的として使用されるが、溶接作業性確保の上でも必要である。金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計が３％未満では、脱酸不足で溶接金属中にブローホールが発生し易く、アークが不安定で溶接の継続が困難となる。一方、金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計が１０％を超えると、溶接金属組織の粒界に低融点酸化物を析出させ靱性が低下する。したがって、金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計は３〜１０％とする。
[Total of Si conversion values of metal Si and Si alloy: 3 to 10%]
Si is added from a Si alloy such as metal Si, Fe-Si, Fe-Si-Mn, and is used for the purpose of deoxidation of the weld metal, but is also necessary for ensuring welding workability. If the sum of Si conversion values of the metal Si and the Si alloy is less than 3%, the deoxidation is insufficient and blowholes are easily generated in the weld metal, the arc is unstable, and it is difficult to continue welding. On the other hand, when the sum of Si conversion values of the metal Si and the Si alloy exceeds 10%, a low melting point oxide is precipitated at the grain boundary of the weld metal structure and the toughness is lowered. Therefore, the total of Si conversion values of metal Si and Si alloy is 3 to 10%.
［金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計：１〜５％］
Ｍｎは、金属Ｍｎ、Ｆｅ−Ｍｎ、Ｆｅ−Ｓｉ−Ｍｎ等のＭｎ合金から添加され、Ｓｉと同様に脱酸剤として添加する他、溶接金属の強度向上を図る上で有効である。金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計が１％未満では、溶接金属の強度が低下する。一方、金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計が５％を超えると、溶接金属の強度が高くなり靭性が低くなる。したがって、金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計は１〜５％とする。
[Total of Mn conversion values of metal Mn and Mn alloy: 1 to 5%]
Mn is added from a Mn alloy such as metal Mn, Fe—Mn, Fe—Si—Mn, etc., and is added as a deoxidizer in the same manner as Si, and is effective in improving the strength of the weld metal. If the sum of Mn conversion values of the metal Mn and the Mn alloy is less than 1%, the strength of the weld metal is lowered. On the other hand, when the sum of the Mn conversion values of the metal Mn and the Mn alloy exceeds 5%, the strength of the weld metal increases and the toughness decreases. Therefore, the total of the Mn conversion values of the metal Mn and the Mn alloy is 1 to 5%.
［Ｔｉ酸化物のＴｉＯ2換算値の合計：１〜３％］
Ｔｉ酸化物は、ルチール、酸化チタン、チタン酸ソーダ、チタンスラグ等から添加され、スラグ生成剤及びアーク安定剤として作用し、アーク安定性及びビード形状を改善する効果を有する。Ｔｉ酸化物のＴｉＯ2換算値の合計が１％未満であると、アークが不安定になるとともに、スラグ流動性が悪くなってビード形状が不良となる。一方、Ｔｉ酸化物のＴｉＯ2換算値の合計が３％を超えると、溶接時に溶融スラグの粘性が高くなりスラグの流れが低下するので、ビードの形状が凸状で溶込みが浅くなり融合不良が生じやすくなる。したがって、Ｔｉ酸化物のＴｉＯ2換算値の合計は１〜３％とする。
[Total of TiO 2 equivalent value of Ti oxide: 1-3%]
Ti oxide is added from rutile, titanium oxide, sodium titanate, titanium slag, etc., and acts as a slag generator and an arc stabilizer, and has an effect of improving arc stability and bead shape. When the total TiO 2 conversion value of the Ti oxide is less than 1%, the arc becomes unstable and the slag fluidity is deteriorated, resulting in a poor bead shape. On the other hand, if the total TiO 2 equivalent value of the Ti oxide exceeds 3%, the viscosity of the molten slag increases during welding and the flow of the slag decreases, so the bead shape is convex and the penetration becomes shallow, resulting in poor fusion. Is likely to occur. Therefore, the total of TiO 2 converted values of Ti oxide is 1 to 3%.
［Ｓｉ酸化物のＳｉＯ2換算値の合計：３〜８％］
Ｓｉ酸化物は、珪砂、長石、水ガラス等から添加され、スラグ生成剤及びアーク安定剤として作用し、アーク安定性及びスラグ剥離性を改善する効果を有する。Ｓｉ酸化物のＳｉＯ2換算値の合計が３％未満であると、アークが弱く不安定になるとともに、生成したスラグのガラス質が少なくなってスラグ剥離性が不良になる。一方、Ｓｉ酸化物のＳｉＯ2換算値の合計が８％を超えると、スラグの粘性が高くなってビード形状が不良となる。したがって、被覆剤中のＳｉ酸化物のＳｉＯ2換算値の合計は３〜８％とする。
[Total of SiO 2 conversion value of Si oxide: 3 to 8%]
Si oxide is added from silica sand, feldspar, water glass, etc., and acts as a slag generator and an arc stabilizer, and has an effect of improving arc stability and slag peelability. When the total of SiO 2 conversion values of the Si oxide is less than 3%, the arc becomes weak and unstable, and the generated slag becomes less vitreous and the slag peelability becomes poor. On the other hand, if the total of SiO 2 conversion values of Si oxide exceeds 8%, the viscosity of the slag becomes high and the bead shape becomes poor. Therefore, the total of SiO 2 conversion values of the Si oxide in the coating is 3 to 8%.
［金属炭酸塩の１種または２種以上の合計：４０〜５５％］
金属炭酸塩は、炭酸カルシウム、炭酸マグネシウム、炭酸バリウム、炭酸マンガン、炭酸リチウム等から１種または２種以上にわたり添加され、アーク中で分解してＣＯ2ガスを発生させて溶着金属を大気から遮蔽して保護する効果を有する。金属炭酸塩の１種または２種以上の合計が４０％未満であると、シールド効果が不足してブローホールが発生しやすくなり、棒焼けが発生しやすくなる。一方、金属炭酸塩の１種または２種以上の合計が５５％を超えると、アークが不安定で凸ビードとなり、スラグ剥離性も悪くなる。したがって、被覆剤中の金属炭酸塩の１種または２種以上の合計は４０〜５５％とする。
[Total of one or more metal carbonates: 40 to 55%]
Metal carbonate is added from one or more of calcium carbonate, magnesium carbonate, barium carbonate, manganese carbonate, lithium carbonate, etc., and decomposes in the arc to generate CO 2 gas to shield the deposited metal from the atmosphere. And has an effect of protecting. If the total of one or more of the metal carbonates is less than 40%, the shielding effect is insufficient, blowholes are likely to occur, and bar burn is likely to occur. On the other hand, if the total of one or more of the metal carbonates exceeds 55%, the arc becomes unstable and becomes a convex bead, and the slag peelability is also deteriorated. Therefore, the total of one or more metal carbonates in the coating agent is 40 to 55%.
［金属弗化物のＦ換算値の合計：１〜５％］
金属弗化物は蛍石、弗化バリウム、弗化マグネシウム、弗化アルミニウム等から添加され、Ｆ換算値はそれらに含有されるＦ換算値の合計である。これら弗素化合物は、いずれも溶融スラグの粘性を下げて流動性のよいスラグを作り優れたビード形状とする。金属弗化物のＦ換算値の合計が１％未満であると、適正な溶融スラグの粘性が得られずビードの形状が劣下する。一方、金属弗化物のＦ換算値の合計が５％を超えると、スラグ剥離性が劣化する。したがって、金属弗化物のＦ換算値の合計は１〜５％とする。
[Total F converted value of metal fluoride: 1 to 5%]
The metal fluoride is added from fluorite, barium fluoride, magnesium fluoride, aluminum fluoride or the like, and the F converted value is the sum of the F converted values contained therein. Each of these fluorine compounds lowers the viscosity of the molten slag to produce a slag with good fluidity and has an excellent bead shape. If the total F converted value of the metal fluoride is less than 1%, an appropriate molten slag viscosity cannot be obtained and the bead shape is deteriorated. On the other hand, if the total F converted value of the metal fluoride exceeds 5%, the slag peelability deteriorates. Accordingly, the total F converted value of the metal fluoride is 1 to 5%.
［有機物の１種または２種以上の合計：０．１〜２．０％］
有機物は、アルギン酸ソーダ、小麦粉、澱粉、コーンスターチ等から１種または２種以上にわたり添加され、アークの吹付けを強くし、溶け込みを深くしてブローホール等の溶接欠陥を抑制する効果がある。有機物の１種または２種以上の合計が０．１％未満であると、アークの吹付けが弱くなり、溶込みが浅くなってブローホール等の溶接欠陥が発生しやすくなる。一方、有機物の１種または２種以上の合計が２．０％を超えると、棒焼けが発生しやすくなり、スパッタ発生量も多くなる。したがって、被覆剤中の有機物の１種または２種以上の合計は０．１〜２．０％とする。
[Total of one or more organic substances: 0.1 to 2.0%]
One or more organic substances are added from sodium alginate, wheat flour, starch, corn starch, etc., and have the effect of strengthening the arc spray and deepening the penetration to suppress welding defects such as blow holes. When the total of one or more organic substances is less than 0.1%, the spraying of the arc becomes weak, the penetration becomes shallow, and welding defects such as blow holes tend to occur. On the other hand, if the total of one or more organic substances exceeds 2.0%, bar burning tends to occur, and the amount of spatter generated increases. Therefore, the total of one or more organic substances in the coating agent is 0.1 to 2.0%.
［鉄粉：１０〜３０％］
鉄粉は溶着金属量を増大させるため、溶接能率を向上させる上で極めて有効である。鉄粉が１０％未満では、溶接能率が低下しビード形状が劣化する。一方、鉄粉が３０％を超えると、溶接時後半において棒焼けし最後まで溶接できない。したがって、鉄粉は１０〜３０％とする。
[Iron powder: 10-30%]
Since iron powder increases the amount of deposited metal, it is extremely effective in improving the welding efficiency. If the iron powder is less than 10%, the welding efficiency is lowered and the bead shape is deteriorated. On the other hand, if the iron powder exceeds 30%, the bar is burnt in the latter half of the welding and cannot be welded to the end. Therefore, the iron powder is 10 to 30%.
［Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計：１〜５％］
Ｎａ化合物及びＫ化合物は、水ガラス中の珪酸ソーダ、珪酸カリウム、カリ長石等から添加され、アーク安定剤として作用してアークを安定化する効果を有する。Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計が１％未満であると、アークが不安定になる。一方、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計が５％を超えると、アークの吹付けが過剰に強くなり、ビード形状が不良になる。したがって、被覆剤中のＮａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計は１〜５％とする。
[Total of Na 2 O converted value and K 2 O converted value of Na compound and K compound: 1 to 5%]
Na compound and K compound are added from sodium silicate, potassium silicate, potassium feldspar and the like in water glass, and act as an arc stabilizer to stabilize the arc. When the total of Na 2 O converted value and K 2 O converted value of Na compound and K compound is less than 1%, the arc becomes unstable. On the other hand, when the total of Na 2 O converted value and K 2 O converted value of Na compound and K compound exceeds 5%, arc spraying becomes excessively strong and the bead shape becomes poor. Therefore, the total of Na 2 O equivalent value and K 2 O equivalent value of Na compound and K compound in the coating is 1 to 5%.
なお、本発明を適用した低水素系被覆アーク溶接棒の残部は、塗装剤として、ヘクトライト、マイカ等の１種以上を合計で被覆剤全質量に対する質量％で５％以下含有することができ、その他はＦｅ−Ｓｉ、Ｆｅ−Ｍｎ、Ｆｅ−Ｓｉ−Ｍｎ等の鉄合金からのＦｅ分及び不可避不純物である。 The remaining part of the low hydrogen-based coated arc welding rod to which the present invention is applied can contain, as a coating agent, one or more of hectorite, mica, etc. in a total of 5% or less by mass based on the total mass of the coating. The others are Fe content and unavoidable impurities from iron alloys such as Fe-Si, Fe-Mn, and Fe-Si-Mn.
また、使用する軟鋼心線は、ＪＩＳ Ｇ３５２３ ＳＷＹ１１を用いることが好ましい。さらに、被覆剤の軟鋼心線への被覆率は、溶接棒全質量に対する被覆剤の質量％で２５〜３８％であることが好ましい。 Moreover, it is preferable to use JIS G3523 SWY11 for the soft steel core wire to be used. Furthermore, it is preferable that the coating rate to the mild steel core wire of the coating agent is 25 to 38% in terms of mass% of the coating agent with respect to the total mass of the welding rod.
以下、本発明を提供した低水素系被覆アーク溶接棒の実施例について具体的に説明する。 Examples of the low hydrogen-based coated arc welding rod that provided the present invention will be specifically described below.
表１に示す直径４．０ｍｍ、長さ４００ｍｍのＪＩＳ Ｇ３５２３ ＳＷＹ１１の軟鋼心線に、表２に示す各成分組成からなる被覆剤を塗布後乾燥して各種低水素系被覆アーク溶接棒を試作した。 Various low hydrogen-based coated arc welding rods were manufactured by applying a coating material composed of each component composition shown in Table 2 on a JIS G3523 SWY11 mild steel core wire having a diameter of 4.0 mm and a length of 400 mm shown in Table 1. .
これら試作溶接棒を使用し、溶接作業性及び機械的性能について調査した。 These prototype welding rods were used to investigate welding workability and mechanical performance.
溶接作業性の評価は、板厚９ｍｍ、幅７５ｍｍ、長さ４５０ｍｍのＪＩＳ Ｇ ３１０１ ＳＳ４００の軟鋼板をＴ字に組んだ試験体を用い、二次側無負荷電圧が６０Ｖの小型溶接機を使用し、溶接電流１７０〜１９０Ａで立向下進溶接を行い、アークの吹付け、アーク安定性、スラグ剥離性、ビード形状、棒焼けの有無を調査した。また、耐棒焼け性は、２１０Ａで立向下進溶接した際、鋼心線が発熱して棒焼けしないものを良好とした。 Welding workability was evaluated using a small welder with a secondary side no-load voltage of 60V, using a test piece in which a JIS G 3101 SS400 mild steel plate with a thickness of 9mm, width of 75mm, and length of 450mm was assembled in a T shape. Then, vertical downward welding was performed at a welding current of 170 to 190A, and the presence or absence of arc spraying, arc stability, slag peelability, bead shape, and bar burning was investigated. Further, the bar burn resistance was determined to be good when the steel core wire generated heat and did not burn when it was vertically welded at 210A.
機械的性能の評価は、板厚１９ｍｍのＪＩＳ Ｇ ３１０６ ＳＭ４９０Ａを用い、ＪＩＺ Ｚ３１１１に準じて交流溶接機で溶着金属試験を行い、引張試験片（Ａ０号）と衝撃試験片（Ｖノッチ試験片）を採取して引張試験及び衝撃試験を行った。 The mechanical performance was evaluated using a JIS G 3106 SM490A with a thickness of 19 mm, and conducting a weld metal test with an AC welder in accordance with JIS Z3111. Tensile specimen (A0) and impact specimen (V-notch specimen) The samples were collected and subjected to a tensile test and an impact test.
引張試験の評価は、引張強さが４４０〜５５０ＭＰａを良好とした。また、靭性の評価は、試験温度−３０℃でシャルピー衝撃試験を行い、各々繰り返し３回の吸収エネルギーの平均値が６０Ｊ以上を良好とした。 The tensile test was evaluated as good when the tensile strength was 440 to 550 MPa. In addition, the toughness was evaluated by performing a Charpy impact test at a test temperature of -30 ° C., and the average value of the absorbed energy of three times each was 60 J or more.
溶接欠陥は、溶着金属試験後の試験体を、ＪＩＳ Ｚ ３１０６に準じてＸ線透過試験を実施し、ブローホール及び融合不良等の有無を調査した。これらの調査結果を表３にまとめて示す。 As for welding defects, the specimens after the weld metal test were subjected to an X-ray transmission test in accordance with JIS Z 3106, and the presence or absence of blow holes and poor fusion was investigated. These survey results are summarized in Table 3.
表２及び表３中、溶接棒記号Ｒ１〜Ｒ１２が本発明例、溶接棒記号Ｒ１３〜Ｒ２５は比較例である。 In Tables 2 and 3, welding rod symbols R1 to R12 are examples of the present invention, and welding rod symbols R13 to R25 are comparative examples.
本発明例である溶接棒Ｒ１〜Ｒ１２は、被覆剤中の金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計、金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計、Ｔｉ酸化物のＴｉＯ2換算値の合計、Ｓｉ酸化物のＳｉＯ2換算値の合計、金属炭酸塩の１種または２種以上の合計、金属弗化物のＦ換算値の合計、有機物の１種または２種以上の合計、鉄粉、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計が適正であるので、アークの吹付けが適正で、アークが安定し、スラグ剥離性に優れ、ビード形状が良好であった。また、棒焼けも発生せず、溶着金属の引張強さ及び吸収エネルギーも良好で、極めて満足な結果であった。 The welding rods R1 to R12 as examples of the present invention are the sum of the Si conversion values of the metal Si and the Si alloy in the coating, the sum of the metal Mn and the Mn conversion value of the Mn alloy, and the total of the TiO 2 conversion values of the Ti oxide. , Total of SiO 2 conversion value of Si oxide, total of one or more metal carbonates, total of F conversion value of metal fluoride, total of one or more organic substances, iron powder, Na Since the total of Na 2 O conversion value and K 2 O conversion value of the compound and K compound is appropriate, the arc spraying is appropriate, the arc is stable, the slag peelability is excellent, and the bead shape is good. . Moreover, bar burning did not occur, and the tensile strength and absorbed energy of the weld metal were good, which was a very satisfactory result.
比較例中溶接棒Ｒ１３は、Ｔｉ酸化物のＴｉＯ2換算値が多いので、溶融スラグの粘性が高くなり、ビードが凸状となり融合不良も発生した。 In the comparative example, the welding rod R13 had a large TiO 2 equivalent value of Ti oxide, so that the viscosity of the molten slag increased, the beads became convex, and poor fusion occurred.
溶接棒Ｒ１４は、金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計が多いので、溶着金属の吸収エネルギーの最低値が低かった。また、鉄粉が多いので、棒焼けした。 Since the welding rod R14 has a large sum of Si-converted values of the metal Si and the Si alloy, the minimum value of the absorbed energy of the weld metal was low. Also, because there was a lot of iron powder, it was burnt.
溶接棒Ｒ１５は、金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計が少ないので、アークが弱く不安定で、ブローホールが生じた。 Since the welding rod R15 had a small total of Si conversion values of the metal Si and the Si alloy, the arc was weak and unstable, and a blow hole was generated.
溶接棒Ｒ１６は、金属Ｍｎ及びＭｎ合金のＭｎ換算値が高いので、溶着金属の引張強さが高く、吸収エネルギーも低かった。また、金属炭酸塩の１種または２種以上の合計が多いので、アークが不安定で、スラグ剥離性が不良となり、ビード形状も凸状であった。 Since welding rod R16 had high Mn conversion values of metal Mn and Mn alloy, the tensile strength of the deposited metal was high and the absorbed energy was also low. Moreover, since there was much 1 type or 2 types or more of metal carbonates, the arc was unstable, slag peelability became bad, and the bead shape was also convex.
溶接棒Ｒ１７は、金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計が少ないので、溶着金属の引張強さが低かった。また、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計が多いので、アークの吹付けが過剰に強く、ビード形状が不良であった。 The welding rod R17 had a low total tensile strength of the deposited metal because the total of Mn conversion values of the metal Mn and the Mn alloy was small. Further, since the sum is larger in terms of Na 2 O values and K 2 O conversion value of Na compounds and K compounds, blowing of the arc is too strong, the bead shape was poor.
溶接棒Ｒ１８は、Ｔｉ酸化物のＴｉＯ2換算値の合計が少ないので、アークが不安定で、ビード形状が不良であった。 The welding rod R18 had a small total of TiO 2 conversion values of Ti oxides, so the arc was unstable and the bead shape was poor.
溶接棒Ｒ１９は、Ｓｉ酸化物のＳｉＯ2換算値の合計が多いので、ビード形状が不良であった。また、有機物の１種または２種以上の合計が多いので、棒焼けが発生した。 The welding rod R19 had a poor bead shape because of the large total of SiO 2 equivalent values of Si oxides. Moreover, since there was much 1 type or 2 types or more of organic substance, stick burning generate | occur | produced.
溶接棒Ｒ２０は、金属炭酸塩の１種または２種以上の合計が少ないので、棒焼けが生じ溶着金属にブローホールも発生した。 Since the welding rod R20 has a small amount of one or more metal carbonates, the rod burned and blowholes were generated in the weld metal.
溶接棒Ｒ２１は、金属弗化物のＦ換算値の合計が多いので、スラグ剥離性が不良であった。また、鉄粉が少なかったので、溶着量が不足してビード形状が不良であった。 Since the welding rod R21 had a large total of F converted values of metal fluoride, the slag peelability was poor. Moreover, since there was little iron powder, the amount of welding was insufficient and the bead shape was unsatisfactory.
溶接棒Ｒ２２は、金属弗化物のＦ換算値が少ないので、ビードの形状が不良であった。 The welding rod R22 had a poor bead shape because the F-converted value of metal fluoride was small.
溶接棒Ｒ２３は、有機物の１種または２種以上の合計が少ないので、アークの吹付けが弱くて溶込みが浅くなり溶着金属にブローホールが発生した。 Since the welding rod R23 has a small total of one or more organic substances, the arc spray was weak and the penetration was shallow, and blowholes were generated in the weld metal.
溶接棒Ｒ２４は、Ｓｉ酸化物のＳｉＯ2換算値の合計が少ないので、アークが弱く不安定で、スラグ剥離性も不良であった Since the welding rod R24 has a small total of SiO 2 conversion values of Si oxide, the arc is weak and unstable, and the slag peelability is also poor.
溶接棒Ｒ２５は、Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値とＫ2Ｏ換算値の合計が少ないので、アークが不安定であった。 In the welding rod R25, the arc was unstable because the total of Na 2 O converted value and K 2 O converted value of Na compound and K compound was small.
Claims (1)
前記被覆剤は、当該被覆剤全質量に対する質量％で、
金属Ｓｉ及びＳｉ合金のＳｉ換算値の合計：３〜１０％、
金属Ｍｎ及びＭｎ合金のＭｎ換算値の合計：１〜５％、
Ｔｉ酸化物のＴｉＯ2換算値の合計：１〜３％、
Ｓｉ酸化物のＳｉＯ2換算値の合計：３〜８％、
金属炭酸塩の１種または２種以上の合計：４０〜５５％、
金属弗化物のＦ換算値の合計：１〜５％、
有機物の１種または２種以上の合計：０．１〜２．０％、
鉄粉：１０〜３０％、
Ｎａ化合物及びＫ化合物のＮａ2Ｏ換算値及びＫ2Ｏ換算値の合計：１〜５％を含有し、
残部は、塗装剤、鉄合金からのＦｅ分及び不可避不純物からなることを特徴とする低水素系被覆アーク溶接棒。 In low hydrogen-based arc welding rods with a coating applied to the steel core wire,
The coating agent is in mass% with respect to the total mass of the coating agent,
Total of Si conversion values of metal Si and Si alloy: 3 to 10%,
Sum of Mn conversion values of metal Mn and Mn alloy: 1 to 5%,
Total of TiO 2 conversion value of Ti oxide: 1 to 3%,
Total of SiO 2 conversion value of Si oxide: 3 to 8%,
Total of one or more metal carbonates: 40-55%,
Total F converted value of metal fluoride: 1 to 5%,
Total of one or more organic substances: 0.1 to 2.0%,
Iron powder: 10-30%,
Total of Na 2 O converted value and K 2 O converted value of Na compound and K compound: 1 to 5%,
The remainder consists of a coating agent, an Fe component from an iron alloy, and inevitable impurities, and a low hydrogen-based coated arc welding rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018060211A JP7039353B2 (en) | 2018-03-27 | 2018-03-27 | Low hydrogen coated arc welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2018060211A JP7039353B2 (en) | 2018-03-27 | 2018-03-27 | Low hydrogen coated arc welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2019171399A true JP2019171399A (en) | 2019-10-10 |
| JP7039353B2 JP7039353B2 (en) | 2022-03-22 |
Family
ID=68166168
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2018060211A Active JP7039353B2 (en) | 2018-03-27 | 2018-03-27 | Low hydrogen coated arc welding rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP7039353B2 (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04367393A (en) * | 1990-07-24 | 1992-12-18 | Kobe Steel Ltd | Low hydrogen type coated electrode |
| JPH05293690A (en) * | 1992-04-16 | 1993-11-09 | Kobe Steel Ltd | Low-hydrogen type coated electrode for weather resistant steel |
| JP2000107889A (en) * | 1998-10-05 | 2000-04-18 | Nippon Steel Weld Prod & Eng Co Ltd | Low hydrogen type covered electrode |
| JP2017064740A (en) * | 2015-09-29 | 2017-04-06 | 日鐵住金溶接工業株式会社 | Low-hydrogen type coated arc welding rod |
-
2018
- 2018-03-27 JP JP2018060211A patent/JP7039353B2/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04367393A (en) * | 1990-07-24 | 1992-12-18 | Kobe Steel Ltd | Low hydrogen type coated electrode |
| JPH05293690A (en) * | 1992-04-16 | 1993-11-09 | Kobe Steel Ltd | Low-hydrogen type coated electrode for weather resistant steel |
| JP2000107889A (en) * | 1998-10-05 | 2000-04-18 | Nippon Steel Weld Prod & Eng Co Ltd | Low hydrogen type covered electrode |
| JP2017064740A (en) * | 2015-09-29 | 2017-04-06 | 日鐵住金溶接工業株式会社 | Low-hydrogen type coated arc welding rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JP7039353B2 (en) | 2022-03-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5153421B2 (en) | Flux-cored wire for gas shielded arc welding | |
| JP2018153853A (en) | Flux-cored wire for gas shield arc welding | |
| JP6437419B2 (en) | Flux-cored wire for carbon dioxide shielded arc welding | |
| JP6502887B2 (en) | Flux-cored wire for gas shielded arc welding | |
| JP2020168651A (en) | COATED ARC WELDING ELECTRODE FOR 9% Ni STEEL WELDING | |
| JP6599807B2 (en) | Flux-cored wire for carbon dioxide shielded arc welding | |
| JP6688162B2 (en) | Illuminite coated arc welding rod | |
| JP6257489B2 (en) | Gas shield arc welding method | |
| JP7039353B2 (en) | Low hydrogen coated arc welding rod | |
| JP7210410B2 (en) | Iron Powder Low Hydrogen Type Coated Arc Welding Rod | |
| JP6845094B2 (en) | High titanium oxide shielded metal arc welding rod | |
| JP6669680B2 (en) | Lime titania coated arc welding rod | |
| JP5455422B2 (en) | Low hydrogen coated arc welding rod | |
| JP6987800B2 (en) | Illuminite-based shielded metal arc welding rod | |
| JP6938361B2 (en) | Lime titania-based shielded metal arc welding rod | |
| JP5348937B2 (en) | Low hydrogen coated arc welding rod | |
| JP6999461B2 (en) | High titanium oxide-based shielded metal arc welding rod | |
| JP2021109200A (en) | Iron powder low hydrogen type coated arc welding electrode | |
| JP2020131234A (en) | Stainless steel flux-cored wire for self-shielded arc-welding | |
| JP7346328B2 (en) | Low hydrogen coated arc welding rod for horizontal fillet welding | |
| JP7506043B2 (en) | Shielded metal arc welding electrodes | |
| JP4311888B2 (en) | Low hydrogen coated arc welding rod | |
| JP7383513B2 (en) | Covered arc welding rod for 9% Ni steel welding | |
| JP7055688B2 (en) | Shielded metal arc welding rod for austenitic stainless steel welding | |
| JP2023152852A (en) | Low hydrogen type coated electrode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20201022 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20210816 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20210824 |
|
| A521 | Request for written amendment filed |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20211021 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20220308 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20220309 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 7039353 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |