JP4708270B2 - Non-low hydrogen coated arc welding rod - Google Patents
Non-low hydrogen coated arc welding rod Download PDFInfo
- Publication number
- JP4708270B2 JP4708270B2 JP2006176230A JP2006176230A JP4708270B2 JP 4708270 B2 JP4708270 B2 JP 4708270B2 JP 2006176230 A JP2006176230 A JP 2006176230A JP 2006176230 A JP2006176230 A JP 2006176230A JP 4708270 B2 JP4708270 B2 JP 4708270B2
- Authority
- JP
- Japan
- Prior art keywords
- welding
- rod
- arc
- low hydrogen
- welding rod
- 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.)
- Active
Links
- 238000003466 welding Methods 0.000 title claims description 65
- 229910052739 hydrogen Inorganic materials 0.000 title claims description 21
- 239000001257 hydrogen Substances 0.000 title claims description 21
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 title claims description 9
- 239000011248 coating agent Substances 0.000 claims description 27
- 239000002893 slag Substances 0.000 claims description 20
- 101100513612 Microdochium nivale MnCO gene Proteins 0.000 claims description 17
- 238000000576 coating method Methods 0.000 claims description 16
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 7
- 239000005416 organic matter Substances 0.000 claims description 5
- 239000003381 stabilizer Substances 0.000 claims description 5
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 239000011324 bead Substances 0.000 description 17
- 150000002431 hydrogen Chemical class 0.000 description 12
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 10
- 238000000354 decomposition reaction Methods 0.000 description 7
- 239000007789 gas Substances 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 6
- 229910002092 carbon dioxide Inorganic materials 0.000 description 5
- 239000001569 carbon dioxide Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 150000004649 carbonic acid derivatives Chemical class 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 230000035515 penetration Effects 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- -1 BaCO 3 Chemical class 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- 229910002551 Fe-Mn Inorganic materials 0.000 description 1
- 229910017082 Fe-Si Inorganic materials 0.000 description 1
- 229910017133 Fe—Si Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229920002472 Starch Polymers 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 235000010980 cellulose Nutrition 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000005493 welding type Methods 0.000 description 1
- 229940100445 wheat starch Drugs 0.000 description 1
Images
Landscapes
- Nonmetallic Welding Materials (AREA)
Description
本発明は、高電流の溶接条件で使用しても溶接作業性などの諸性能を満足しつつ耐棒焼け性に優れる非低水素系被覆アーク溶接棒（以下、非低水素系棒という。）に関するものである。 The present invention is a non-low hydrogen-based coated arc welding rod (hereinafter referred to as a non-low hydrogen rod) that is excellent in rod burning resistance while satisfying various performances such as welding workability even when used under high current welding conditions. It is about.
非低水素系棒は、低水素系被覆アーク溶接棒に比べ、溶接金属中の拡散性水素量が多いことから拘束の大きい被溶接構造物での耐割れ性や衝撃靱性は劣るものの溶接作業性が良いことから、一般軟鋼の溶接用として幅広く使用されている。 Non-low hydrogen rods have a higher amount of diffusible hydrogen in the weld metal than low hydrogen clad arc welding rods. Therefore, it is widely used for welding of general mild steel.
非低水素系棒は、溶接作業能率のさらなる向上が強く要求されることから、高電流の溶接条件で使用される場合が多い。高電流の溶接条件で溶接すると、深い溶け込みが得られる反面、溶接の後半部において鋼心線が発熱し、被覆剤中の有機物がジュール熱で分解燃焼して溶接棒が焼けた状態、即ち、棒焼け現象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。 Non-low hydrogen rods are often used under high current welding conditions because there is a strong demand for further improvement in welding work efficiency. When welding under high current welding conditions, deep penetration is obtained, but the steel core wire generates heat in the second half of the welding, the organic matter in the coating decomposes and burns with Joule heat, the welding rod burns, There is a drawback that the bar burn phenomenon tends 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.
このような非低水素系棒の問題に対して、種々の提案がされている。例えば、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にした珪酸ソーダを用いて棒焼け現象を低減している発明がある（例えば、特許文献１参照）。ところが、この手段では溶接棒の生産時に被覆の乾燥速度が速くなり、被覆の乾燥割れが生じ易くなり、さらに、Ｎａ2Ｏの含有量が減少するためアーク状態が劣化し、スパッタ飛散が多くなるという問題がある。 Various proposals have been made for the problem of such non-low hydrogen rods. For example, there is an invention in which bar burning phenomenon is reduced by using sodium silicate having a SiO 2 / Na 2 O molar ratio of 2.8 to 3.8 in water glass as a fixing agent (for example, Patent Document 1). reference). However, this means increases the drying speed of the coating during the production of the welding rod, tends to cause dry cracking of the coating, and further reduces the arc state due to a decrease in Na 2 O content, resulting in increased spatter scattering. There is a problem.
また、非低水素系棒に一般的に使用されるルチールに含まれるＳｎ量を限定して耐棒焼け性を改善している発明があるが（例えば、特許文献２参照）、天然鉱物であり、Ｓｎ含有量が安定しないことや、耐棒焼け性に効果が見られるまでＳｎ含有量を多くすると溶接金属の高温割れが発生し易いという問題があった。さらにＳｎを含有するルチールは産地が特定され、粒度が細かいという特徴があるため、溶接棒の生産時に被覆の乾燥割れやガス膨れが生じるという問題もある。 Further, there is an invention in which the amount of Sn contained in rutile generally used for non-low hydrogen rods is limited to improve rod burn resistance (see, for example, Patent Document 2), but it is a natural mineral. Further, there are problems that the Sn content is not stable, and that when the Sn content is increased until an effect on the rod burn resistance is increased, hot cracking of the weld metal is likely to occur. Furthermore, since the rutile containing Sn has a feature that the production area is specified and the particle size is fine, there is a problem that dry cracking and gas blistering of the coating occur during production of the welding rod.
また、被覆剤の気孔率を限定することにより耐棒焼け性を改善している発明があるが（例えば、特許文献３参照）、耐棒焼け性に効果が見られるまで被覆剤の気孔率が高くなると耐吸湿性が劣化するため、アークが強くなりすぎビード形状が不良となるという問題があった。 In addition, there is an invention that improves the anti-sticking property by limiting the porosity of the coating agent (see, for example, Patent Document 3), but the porosity of the coating agent is increased until an effect on the anti-sticking property is seen. When it is high, the moisture absorption resistance is deteriorated, so that there is a problem that the arc becomes too strong and the bead shape becomes poor.
このように、従来の非低水素系棒においては、溶接作業性などの諸性能を満足しつつ高電流の溶接条件での溶接時の耐棒焼け性を安定して優れたものにすることは困難であった。 In this way, with conventional non-low hydrogen rods, it is possible to stably improve the rod burning resistance during welding under high current welding conditions while satisfying various performances such as welding workability. It was difficult.
本発明は、高電流の溶接条件で溶接しても溶接作業性などの諸性能を満足しつつ耐棒焼け性に優れる非低水素系棒を提供することを目的とする。 An object of the present invention is to provide a non-low hydrogen rod that is excellent in rod burning resistance while satisfying various performances such as welding workability even when welding under high current welding conditions.
本発明者は、非低水素系被覆アーク溶接棒の耐焼付け性について鋭意研究し、特に被覆剤中に放熱作用に有効な特定のガス発生剤を含有させることで、耐棒焼付け性が改善できることを見出して本発明を完成した。 The present inventor has eagerly studied the seizure resistance of non-low hydrogen-based coated arc welding rods, and in particular, by including a specific gas generating agent effective for heat dissipation in the coating agent, the rod seizure resistance can be improved. And the present invention was completed.
本発明の要旨は、鋼心線に被覆剤が塗装されている被覆アーク溶接棒において、前記被覆剤は、ＭｎＣＯ3およびＦｅＣＯ3の１種または２種の合計を０．３〜１．８質量％、ＴｉＯ2を１２〜３０質量％、ＳｉＯ2を１５〜３０質量％、ＣａＣＯ3を５〜１５質量％、有機物を２〜５質量％、鉄粉を２０〜４５質量％含有し、その他は脱酸剤、スラグ生成剤、アーク安定剤および不可避不純物からなることを特徴とする非低水素系被覆アーク溶接棒にある。 The gist of the present invention is that in a coated arc welding rod in which a coating agent is coated on a steel core wire, the coating agent is 0.3 to 1.8 mass in total of one or two of MnCO 3 and FeCO 3 . %, TiO 2 12-30% by mass, SiO 2 15-30% by mass, CaCO 3 5-15% by mass, organic matter 2-5% by mass, iron powder 20-45% by mass, and others A non-low hydrogen-based coated arc welding rod comprising a deoxidizer, a slag generator, an arc stabilizer, and inevitable impurities.
本発明の非低水素系被覆アーク棒によれば、耐棒焼け性を著しく改善し、併せて良好な溶接作業性などの諸性能を確保できる溶接棒を提供でき、溶接施工においては高電流の溶接条件が使用できるので溶接作業能率向上に大いに貢献できる。 According to the non-low hydrogen-based coated arc rod of the present invention, it is possible to provide a welding rod that can significantly improve the rod burn resistance and also ensure various performances such as good welding workability. Since welding conditions can be used, it can greatly contribute to the improvement of welding work efficiency.
非低水素系棒の棒焼けは、前述の通り、被覆剤中の有機物のジュール熱による分解燃焼が主原因となり、被覆剤が熱劣化するものである。したがって、耐棒焼け性を改善するには、ジュール熱を抑制する必要があり、そのためには溶融速度を速くすることや被覆剤からの放熱作用を活発にすることが重要である。そこでガス発生剤の放熱作用に着目し、金属炭酸塩における炭酸ガスの分解温度が耐棒焼け性におよぼす影響について種々実験した。 As described above, the non-low hydrogen rod burning is mainly caused by decomposition and combustion of organic substances in the coating due to Joule heat, and the coating is thermally deteriorated. Therefore, in order to improve the rod burning resistance, it is necessary to suppress Joule heat. For that purpose, it is important to increase the melting rate and to activate the heat radiation action from the coating agent. Therefore, paying attention to the heat radiation action of the gas generating agent, various experiments were conducted on the influence of the decomposition temperature of carbon dioxide in metal carbonates on the anti-sticking property.
非低水素系棒の被覆剤中に添加する金属炭酸塩の炭酸ガス分解温度は、ＣａＣＯ3が８００〜１０００℃、ＭｇＣＯ3が６００〜７００℃であり、これらの含有量を増加することで耐棒焼け性は改善されるが、アークが強くなると共にスラグ生成剤が不足するためビード形状が不良となる問題があった。そこで、その他の金属炭酸塩（ＢａＣＯ3、ＭｎＣＯ3、Ｋ2ＣＯ3、ＦｅＣＯ3、Ｌｉ2ＣＯ3、ＳｒＣＯ3など）について検討した結果、分解温度の低いＭｎＣＯ3およびＦｅＣＯ3が耐棒焼け性に極めて有効であることを見出した。 Carbon dioxide decomposition temperature of the non-low hydrogen-based bar metal carbonate to be added to the coating agent is, CaCO 3 is 800 to 1000 ° C., a MgCO 3 is 600 to 700 ° C., resistance by increasing the content thereof Although the bar burnability is improved, there is a problem that the bead shape becomes poor because the arc becomes strong and the slag forming agent is insufficient. Therefore, as a result of examining other metal carbonates (BaCO 3 , MnCO 3 , K 2 CO 3 , FeCO 3 , Li 2 CO 3 , SrCO 3, etc.), MnCO 3 and FeCO 3 having a low decomposition temperature are resistant to sticking. Has been found to be extremely effective.
棒焼け時における被覆剤の温度は６００℃前後まで上昇するが、ＭｎＣＯ3およびＦｅＣＯ3は炭酸ガスの分解温度が低く、ＭｎＣＯ3が３００〜５００℃、ＦｅＣＯ3が４００〜５００℃であるため、被覆剤からの放熱作用を促進させると同時に、アーク電圧が更に上がり溶融速度を速くするので耐棒焼け性が著しく向上することが判った。また、ＢａＣＯ3、Ｋ2ＣＯ3、Ｌｉ2ＣＯ3、ＳｒＣＯ3など炭酸ガスの分解温度が６００℃を超える金属炭酸塩については、被覆剤からの放熱作用が得られず耐棒焼け性を改善するには至らなかった。 Although the temperature of the coating agent at the time of burning the bar rises to around 600 ° C., MnCO 3 and FeCO 3 are low in decomposition temperature of carbon dioxide gas, MnCO 3 is 300 to 500 ° C., FeCO 3 is 400 to 500 ° C., It has been found that the heat resistance from the coating is promoted and at the same time the arc voltage is further increased and the melting rate is increased, so that the bar burn resistance is remarkably improved. Also, for metal carbonates such as BaCO 3 , K 2 CO 3 , Li 2 CO 3 , SrCO 3 and the like where the decomposition temperature of carbon dioxide exceeds 600 ° C., heat dissipation from the coating agent is not obtained, improving rod burning resistance I couldn't.
まず、ＭｎＣＯ3およびＦｅＣＯ3の適正含有量を調査するため、次のような実験を行った。表１に示す非低水素系棒の被覆剤にＭｎＣＯ3およびＦｅＣＯ3の１種または２種の含有量を０〜３．５質量％（以下、％という。）まで変化させたときの耐棒焼け性および溶接作業性について調査した。なお、心線は軟鋼の直径３．２ｍｍ、長さ３５０ｍｍを用いた。 First, in order to investigate the proper contents of MnCO 3 and FeCO 3 , the following experiment was conducted. Non-low hydrogen rod coating material shown in Table 1 with a rod resistance when the content of one or two of MnCO 3 and FeCO 3 is changed to 0 to 3.5% by mass (hereinafter referred to as “%”). The burnability and welding workability were investigated. The core wire used was a mild steel with a diameter of 3.2 mm and a length of 350 mm.
耐棒焼け性試験は、板厚９ｍｍ、幅１００ｍｍ、長さ４５０ｍｍの軟鋼板を用い交流溶接機を使用して、電流は高電流条件である１８０Ａとした。判定方法は、非低水素系棒特有に生じる溶接現象を活用した。即ち、非低水素系棒は有機物を含有するため高電流で溶接を行うと未溶接部の被覆剤が変質して被覆筒が急激に形成されなくなり、かつ、アーク状態も急変してアーク力が低下し始める部分が生じる。よって、その位置でアークを消弧させ、残りの溶接棒長、つまり正常な溶接ができない残棒長を測定し、各試験の溶接棒１０本の平均値が８０ｍｍ以下を良好とした。 In the rod burn resistance test, a mild steel plate having a thickness of 9 mm, a width of 100 mm, and a length of 450 mm was used, and an AC welding machine was used, and the current was 180 A, which is a high current condition. The judgment method utilized the welding phenomenon that occurs peculiar to non-low hydrogen rods. That is, since non-low hydrogen rods contain organic matter, when welding is performed at a high current, the coating material of the unwelded part is changed and the coated cylinder is not formed rapidly, and the arc state is also suddenly changed and the arc force is changed. Some parts start to decline. Therefore, the arc was extinguished at that position, and the remaining welding rod length, that is, the remaining rod length that could not be normally welded, was measured, and the average value of 10 welding rods in each test was 80 mm or less.
また、溶接作業性の調査は、板厚４．５ｍｍ、幅７５ｍｍ、長さ４５０ｍｍの軟鋼板をＴ型に組み、交流溶接機を用い、電流は水平すみ肉溶接が１４０Ａ、立向姿勢溶接が１００Ａの溶接条件で、それぞれのアーク状態、スラグ状態、再アーク性、ビード形状などを調査した。その判定は水平すみ肉と立向姿勢溶接の溶接作業性を総合判定した。以上の試験から得られた結果を図１に示す。 Welding workability was investigated by assembling a mild steel plate with a thickness of 4.5 mm, width 75 mm, and length 450 mm into a T shape, using an AC welding machine, and the current was 140 A for horizontal fillet welding and vertical position welding. Under the welding conditions of 100 A, each arc state, slag state, re-arcability, bead shape, etc. were investigated. The judgment was made comprehensively on the welding workability of horizontal fillet and vertical position welding. The results obtained from the above tests are shown in FIG.
図１は、被覆剤中のＭｎＣＯ3およびＦｅＣＯ3の添加量と残棒長さの関係を示したもので、ＭｎＣＯ3およびＦｅＣＯ3の１種または２種の合計添加量が２％以上では、スラグ生成剤の不足およびアーク電圧が高くなることからビード形状を満足することができないため、微量添加であることが極めて重要であることが判った。さらに適正添加量の検討を進めた結果、１．８％を超えるとビード形状が劣化した。また、ＭｎＣＯ3およびＦｅＣＯ3の１種または２種の合計添加量が０．３％未満では、残棒長さが長く耐棒焼け性を改善することができない。したがって、良好な溶接性能を確保しつつ優れた耐棒焼け性を得るには、ＭｎＣＯ3およびＦｅＣＯ3の１種または２種の合計を０．３〜１．８％にすべきであることが判った。 FIG. 1 shows the relationship between the amount of MnCO 3 and FeCO 3 added to the coating agent and the length of the remaining bar. When the total amount of one or two of MnCO 3 and FeCO 3 is 2% or more, Since the bead shape cannot be satisfied due to the shortage of slag forming agent and the increase in arc voltage, it was found that the addition of a trace amount is extremely important. As a result of further investigation of the appropriate amount added, the bead shape deteriorated when it exceeded 1.8%. Further, if the total amount of one or two of MnCO 3 and FeCO 3 is less than 0.3%, the remaining bar length is long and the bar burn resistance cannot be improved. Therefore, in order to obtain excellent rod burning resistance while ensuring good welding performance, the total of one or two of MnCO 3 and FeCO 3 should be 0.3 to 1.8%. understood.
次に、ＴｉＯ2は、スラグ生成剤およびアーク安定剤として添加する。ＴｉＯ2が１２％未満であるとスラグの流動性が劣化し、ビード外観が不良となる。一方、３０％を超えるとスラグが緻密になりすぎスラグ剥離性が不良となる。 Next, TiO 2 is added as a slag generator and arc stabilizer. If the TiO 2 content is less than 12%, the fluidity of the slag deteriorates and the bead appearance becomes poor. On the other hand, if it exceeds 30%, the slag becomes too dense and the slag peelability becomes poor.
ＳｉＯ2もスラグ生成剤およびアーク安定剤として添加する。ＳｉＯ2が１５％未満であるとアークが弱く適度な溶け込み深さが得られず、また生成したスラグのガラス質が少なく良好なスラグ剥離性が得られない。一方、３０％を超えるとアークが強くなりすぎてビード形状が不良となる。 SiO 2 is also added as a slag generator and arc stabilizer. If the SiO 2 content is less than 15%, the arc is weak and an appropriate penetration depth cannot be obtained, and the generated slag has little vitreous quality and good slag releasability cannot be obtained. On the other hand, if it exceeds 30%, the arc becomes too strong and the bead shape becomes poor.
また、ガス発生剤として前記ＭｎＣＯ3およびＦｅＣＯ3の他にＣａＣＯ3を添加することが有効である。ＣａＣＯ3が５％未満では耐棒焼け性が劣化し、ガス発生量が少ないことから溶着金属や溶融スラグを十分に保護できず、ビード形状が不良となる。一方、１５％を超えるとアークが強くなると共にスラグ生成量が少なくなりビード形状が不良となる。 It is also effective to add CaCO 3 as a gas generating agent in addition to MnCO 3 and FeCO 3 . If CaCO 3 is less than 5%, the rod burn resistance deteriorates and the amount of gas generated is small, so that the weld metal and molten slag cannot be sufficiently protected, and the bead shape becomes poor. On the other hand, if it exceeds 15%, the arc becomes strong and the amount of slag generation decreases, resulting in a poor bead shape.
有機物は、再アーク性を向上することができ、被覆筒の強化（耐棒欠け性）およびアーク力の確保に有効である。有機物が２％未満であると良好な再アーク性が得られず、また耐棒欠け性が不良となる。一方、５％を超えると耐棒焼け性が劣化し、またアークが強くなりすぎビード形状が不良となる。なお、有機物としてセルロース、デキストリン、小麦粉澱粉、リグニン、コーンスターチなどを使用することができる。 The organic substance can improve the re-arcing property and is effective in strengthening the coated cylinder (bar chip resistance) and securing the arc force. If the organic content is less than 2%, good re-arcing properties cannot be obtained, and the rod chip resistance is poor. On the other hand, if it exceeds 5%, the bar burn resistance deteriorates, and the arc becomes too strong, resulting in a poor bead shape. In addition, cellulose, dextrin, wheat starch, lignin, corn starch, etc. can be used as an organic substance.
鉄粉は、良好な再アーク性が得られると同時に作業能率を向上させるために必要である。鉄粉が２０％未満であると良好な再アーク性を得ることはできない。一方、４５％を超えると被覆筒が浅くなりアークが不安定で短絡し易く、被覆の電気伝導性が過剰に高くなり被覆筒以外でもアークが発生しする場合があり好ましくない。 Iron powder is necessary to improve work efficiency while at the same time obtaining good re-arcing properties. When the iron powder is less than 20%, good rearcability cannot be obtained. On the other hand, if it exceeds 45%, the coated cylinder becomes shallow, the arc is unstable and easily short-circuited, the electrical conductivity of the coating becomes excessively high, and an arc may be generated outside the coated cylinder.
本発明の非低水素系棒は、その他の成分として脱酸剤であるＦｅ−ＭｎやＦｅ−Ｓｉを１５％以下、スラグ生成剤であるＭｇＯ、Ａｌ2Ｏ3、ＦｅＯなどを５％以下、アーク安定剤であるＮａ2ＯやＫ2Ｏを４％以下の範囲で含有することができる。 The non-low hydrogen rod of the present invention includes 15% or less of deoxidizers Fe—Mn and Fe—Si as other components, and 5% or less of MgO, Al 2 O 3 , FeO and the like as slag generators, The arc stabilizer Na 2 O or K 2 O can be contained in a range of 4% or less.
次に実施例により本発明の効果を更に具体的に説明する。
表２に示す成分組成の被覆剤を直径３．２mm、長さ３５０mmの軟鋼心線に被覆塗装して１２種類の溶接棒を試作し、交流溶接機を使用して、前述した溶接条件および判定方法により耐棒焼け性、溶接作業性について調査した。更に、再アーク性についても調査した。
Next, the effects of the present invention will be described more specifically with reference to examples.
12 types of welding rods were made by coating a coating material having the composition shown in Table 2 on a mild steel core wire having a diameter of 3.2 mm and a length of 350 mm, and using the AC welding machine, the above-mentioned welding conditions and judgments were made. The method was investigated for rod burn resistance and welding workability. Furthermore, the re-arcing property was also investigated.
再アーク性試験は、二次側無負荷電圧が６０Ｖの小型溶接機を使用して１０秒間溶接し、溶接棒先端の被覆部が常温になった後、溶接棒の被覆筒を板厚９ｍｍの軟鋼板をＴ型に組んだ試験体のすみ肉部へ軽く接触させて各２０本調べた。直ちにアークが発生したものを合格と判定し、合格本数が１６本以上を良好とした。それらの結果を表３にまとめて示す。 In the re-arcing test, welding was performed for 10 seconds using a small welding machine having a secondary side no-load voltage of 60 V, and the coating portion of the welding rod tip reached room temperature. Twenty pieces of each were examined by lightly contacting the fillet portion of the test piece in which the mild steel plate was assembled in a T shape. Immediately when an arc was generated, it was determined to be acceptable, and the number of acceptable samples was 16 or more. The results are summarized in Table 3.
表２および表３中溶接棒Ｎｏ．１〜Ｎｏ．６が本発明例、溶接棒Ｎｏ．７〜Ｎｏ．１２は比較例である。 In Table 2 and Table 3, the welding rod No. 1-No. 6 is an example of the present invention, welding rod No. 7-No. 12 is a comparative example.
本発明例である溶接棒Ｎｏ．１〜Ｎｏ．６は、炭酸ガスの分解温度が低いＭｎＣＯ3およびＦｅＣＯ3の添加量が適正であるので、耐棒焼け性が優れ、ＴｉＯ2、ＳｉＯ2、ＣａＣＯ3、有機物および鉄粉の添加量も適正であるので、再アーク性および溶接作業性も良好で、極めて満足な結果であった。 The welding rod no. 1-No. No. 6 has an appropriate amount of addition of MnCO 3 and FeCO 3 having a low decomposition temperature of carbon dioxide gas, so that it is excellent in resistance to bar burning, and the amounts of addition of TiO 2 , SiO 2 , CaCO 3 , organic matter and iron powder are also appropriate. As a result, the re-arcing property and the welding workability were good, and the results were extremely satisfactory.
比較例中溶接棒Ｎｏ．７は、ＭｎＣＯ3およびＦｅＣＯ3の合計添加量が少ないので被覆剤からの放熱作用が得られず、また溶融速度が遅くなり耐棒焼け性が不良であった。さらに、有機物が多いのでビード形状も不良となった。 In the comparative example, the welding rod No. In No. 7, since the total amount of MnCO 3 and FeCO 3 added was small, the heat dissipation action from the coating agent was not obtained, the melting rate was slow, and the bar burn resistance was poor. Furthermore, since there are many organic substances, the bead shape was also poor.
溶接棒Ｎｏ．８は、ＭｎＣＯ3およびＦｅＣＯ3の合計添加量が多いのでアークが強くなりすぎビード形状が不良となった。また、有機物が少ないので再アーク時に被覆欠けが発生し溶接棒が短絡した。 Welding rod no. In No. 8, since the total amount of MnCO 3 and FeCO 3 was large, the arc became too strong and the bead shape was poor. Moreover, since there was little organic substance, the covering chip | tip generate | occur | produced at the time of re-arcing, and the welding rod short-circuited.
溶接棒Ｎｏ．９は、ＣａＣＯ3が少ないので耐棒焼け性およびビード形状が不良であった。また、鉄粉が多いのでアークが不安定で短絡しやすくなった。
溶接棒Ｎｏ．１０は、ＳｉＯ2が多いのでアークが強くなりすぎてビード形状が不良であった。また、鉄粉が少ないので再アーク性も不良であった。
Welding rod no. No. 9 was poor in bar burn resistance and bead shape due to a small amount of CaCO 3 . In addition, since there is a lot of iron powder, the arc is unstable and it is easy to short circuit.
Welding rod no. No. 10 had a poor bead shape because the arc was too strong because of the large amount of SiO 2 . Moreover, since there was little iron powder, re-arc property was also bad.
溶接棒Ｎｏ．１１は、ＣａＣＯ3が多いのでアークが強くなりスラグ生成量が少なくなってビード形状が不良となった。また、ＴｉＯ2が多いのでスラグ剥離性も不良であった。 Welding rod no. No. 11 had a large amount of CaCO 3 , so that the arc became strong, the amount of slag generation was reduced, and the bead shape was poor. It was also slag removability also poor because TiO 2 is large.
溶接棒Ｎｏ．１２は、ＴｉＯ2が少ないのでスラグの流動性が劣化してビード外観が不良であった。また、ＳｉＯ2が少ないのでアークが弱くスラグが結晶化してスラグ剥離性も不良であった。 Welding rod no. No. 12 had less TiO 2 , so the fluidity of the slag deteriorated and the bead appearance was poor. Further, since SiO 2 is less arc weak slag was poor even the slag removability was crystallized.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006176230A JP4708270B2 (en) | 2006-06-27 | 2006-06-27 | Non-low hydrogen coated arc welding rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2006176230A JP4708270B2 (en) | 2006-06-27 | 2006-06-27 | Non-low hydrogen coated arc welding rod |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2008006446A JP2008006446A (en) | 2008-01-17 |
| JP4708270B2 true JP4708270B2 (en) | 2011-06-22 |
Family
ID=39065134
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2006176230A Active JP4708270B2 (en) | 2006-06-27 | 2006-06-27 | Non-low hydrogen coated arc welding rod |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4708270B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5698648B2 (en) * | 2011-11-29 | 2015-04-08 | 日鐵住金溶接工業株式会社 | Coated arc welding rod for horizontal fillet welding |
| JP6845094B2 (en) * | 2017-06-14 | 2021-03-17 | 日鉄溶接工業株式会社 | High titanium oxide shielded metal arc welding rod |
| JP6938361B2 (en) * | 2017-12-27 | 2021-09-22 | 日鉄溶接工業株式会社 | Lime titania-based shielded metal arc welding rod |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS62240198A (en) * | 1986-04-11 | 1987-10-20 | Nippon Steel Corp | Non-low hydrogen type coated electrode |
| JPH08276292A (en) * | 1995-04-04 | 1996-10-22 | Nippon Steel Corp | Non-low hydrogen type coated electrode |
| JPH09216090A (en) * | 1996-02-09 | 1997-08-19 | Nippon Steel Weld Prod & Eng Co Ltd | Non-low hydrogen covered electrode |
| JPH09234589A (en) * | 1996-02-29 | 1997-09-09 | Nippon Steel Corp | Non-low hydrogen coated arc welding rod |
| JP2001259889A (en) * | 2000-03-22 | 2001-09-25 | Nippon Steel Weld Prod & Eng Co Ltd | Non-low-hydrogen type covered electrode |
-
2006
- 2006-06-27 JP JP2006176230A patent/JP4708270B2/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| JP2008006446A (en) | 2008-01-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108526752B (en) | Self-protection flux-cored wire for welding in wading environment | |
| BRPI0505405B1 (en) | Low moisture absorption core electrode, method for forming a diffusible low hydrogen solder fillet and arc stabilization component. | |
| JP5367312B2 (en) | High cellulosic coated arc welding rod | |
| JP5179114B2 (en) | Flux for submerged arc welding of steel for low temperature and its welding method | |
| KR20190024872A (en) | Multi-coated electrode for welding stainless steel | |
| JP4708270B2 (en) | Non-low hydrogen coated arc welding rod | |
| JP6641084B2 (en) | Low hydrogen coated arc welding rod with excellent resistance to bar burn during welding | |
| JP6688162B2 (en) | Illuminite coated arc welding rod | |
| JP6845094B2 (en) | High titanium oxide shielded metal arc welding rod | |
| JP6669680B2 (en) | Lime titania coated arc welding rod | |
| JP6987800B2 (en) | Illuminite-based shielded metal arc welding rod | |
| JP3563614B2 (en) | Low hydrogen coated arc welding rod | |
| JP6938361B2 (en) | Lime titania-based shielded metal arc welding rod | |
| US2043927A (en) | Welding electrode | |
| JP3488357B2 (en) | Non-low hydrogen coated arc welding rod | |
| JP2007125606A (en) | Non-low-hydrogen type coated electrode | |
| JP3184742B2 (en) | Low hydrogen coated arc welding rod | |
| US1884715A (en) | Welding electrode | |
| JP4481873B2 (en) | Iron powder for coated arc welding rod and coated arc welding rod for tacking | |
| JP4503451B2 (en) | Lime titania coated arc welding rod | |
| JP2009269055A (en) | Low-hydrogen type coated electrode | |
| JP6669639B2 (en) | Covered arc welding rod for low hydrogen tacking | |
| JPH10193177A (en) | Non-low hydrogen based coated electrode | |
| JP5698648B2 (en) | Coated arc welding rod for horizontal fillet welding | |
| JP2001259889A (en) | Non-low-hydrogen type covered electrode |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20080916 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20110302 |
|
| 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: 20110315 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20110316 |
|
| R150 | Certificate of patent or registration of utility model |
Ref document number: 4708270 Country of ref document: JP Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |