JPH10230390A - Coated electrode for welding stainless steel - Google Patents
Coated electrode for welding stainless steelInfo
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- JPH10230390A JPH10230390A JP3658897A JP3658897A JPH10230390A JP H10230390 A JPH10230390 A JP H10230390A JP 3658897 A JP3658897 A JP 3658897A JP 3658897 A JP3658897 A JP 3658897A JP H10230390 A JPH10230390 A JP H10230390A
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明はステンレス鋼の溶接
に使用される被覆アーク溶接棒に関し、特に、溶接母材
と同等の優れた高温特性を有する溶接金属を得ることが
できると共に、溶接金属のスラグ剥離性を向上させるこ
とができるステンレス鋼溶接用被覆アーク溶接棒に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coated arc welding rod used for welding stainless steel, and more particularly, to a welding metal having excellent high-temperature characteristics equivalent to that of a welding base metal, The present invention relates to a coated arc welding rod for stainless steel welding capable of improving slag peelability.
【０００２】[0002]
【従来の技術】オーステナイト系ステンレス鋼は、耐錆
性、耐食性、耐酸化性及び耐熱性等が優れていることか
ら、石油精製、化学及び食品等の各種プラントの関連機
器等に広く適用されている。従って、ステンレス鋼は、
常温常圧条件から高温高圧の腐食雰囲気までの多種の条
件下で使用されている。2. Description of the Related Art Austenitic stainless steels are widely used in equipment related to various plants such as petroleum refining, chemical and foodstuffs because of their excellent rust resistance, corrosion resistance, oxidation resistance and heat resistance. I have. Therefore, stainless steel
It is used under various conditions from normal temperature and normal pressure to high temperature and high pressure corrosive atmosphere.
【０００３】このようなステンレス鋼を溶接するための
被覆アーク溶接棒についても、従来より、使用環境に合
わせたものが設計されており、これにより、所望の特性
を有する溶接金属を得ることができる。例えば、溶接棒
中の硫黄量及び酸素量を低減すると共に、フェライト含
有量を調整することにより、高温において高い機械的性
能を保持することができる溶接金属を得ることができ
る。[0003] As for such coated arc welding rods for welding stainless steel, those which are conventionally designed according to the use environment have been designed so that a weld metal having desired characteristics can be obtained. . For example, by reducing the amount of sulfur and oxygen in the welding rod and adjusting the ferrite content, a weld metal capable of maintaining high mechanical performance at high temperatures can be obtained.
【０００４】また、近時、Ｂｉ等の低融点酸化物を形成
する不純物が、溶接棒中に存在すると、その含有量が極
めて微量であっても、高温における機械的性能が低下す
ることが開示されている。即ち、室温から高温までの環
境に使用される溶接材料については、溶接金属中のＢｉ
及びこのＢｉと同様の影響がある硫黄を可能な限り低減
することにより、得られる溶接金属の機械的性能を向上
させることができる。Further, recently, it has been disclosed that, when impurities forming a low melting point oxide such as Bi are present in a welding rod, mechanical performance at high temperatures is reduced even if the content is extremely small. Have been. That is, for welding materials used in environments from room temperature to high temperature, Bi in the weld metal
By reducing as much as possible sulfur having the same effect as Bi, the mechanical performance of the obtained weld metal can be improved.
【０００５】[0005]
【発明が解決しようとする課題】一方、Ｂｉが低融点酸
化物であるＢｉ2Ｏ3の状態で溶接棒中に添加されている
と、溶接作業性、特に、スラグ剥離性が極めて優れたも
のとなることは、公知である。また、溶接棒の被覆剤中
に硫黄又はセレンの単体を添加することにより、スラグ
の剥離性を向上させることができることも提案されてい
る（特開昭５７−１３０７９７号公報）。On the other hand, when Bi is added to the welding rod in the form of Bi 2 O 3 , which is a low melting point oxide, the welding workability, particularly the slag peeling property, is extremely excellent. Is known. It has also been proposed that by adding a simple substance of sulfur or selenium to a coating material for a welding rod, the slag removability can be improved (JP-A-57-130797).
【０００６】このように、スラグの剥離性を向上させる
ための元素を溶接棒中に添加すると、高温における機械
的性能の劣化を招き、この機械的性能を高めるために酸
化Ｂｉ又は硫黄の溶接棒中の含有量を低減すると、スラ
グの剥離性が低下することになる。即ち、スラグの剥離
性及び高温における機械的性能を共に向上させることが
できる被覆アーク溶接棒については、未だ提案されてい
ない。[0006] As described above, when an element for improving the slag removability is added to the welding rod, mechanical performance is deteriorated at a high temperature, and in order to enhance the mechanical performance, Bi or sulfur welding rod is used. When the content in the slag is reduced, the removability of the slag is reduced. That is, a coated arc welding rod capable of improving both the slag peelability and the mechanical performance at high temperatures has not yet been proposed.
【０００７】本発明はかかる問題点に鑑みてなされたも
のであって、高温において良好な機械的性能を保持する
ことができると共に、スラグ剥離性等の溶接作業性が優
れた溶接金属を得ることができるステンレス鋼溶接用被
覆アーク溶接棒を提供することを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to obtain a weld metal which can maintain good mechanical performance at a high temperature and has excellent welding workability such as slag removability. It is an object of the present invention to provide a coated arc welding rod for stainless steel welding that can perform welding.
【０００８】[0008]
【課題を解決するための手段】本発明に係るステンレス
鋼溶接用被覆アーク溶接棒は、Ｎｉ−Ｃｒステンレス鋼
からなる心線の表面に被覆剤が塗布されている被覆アー
ク溶接棒において、被覆剤全重量あたり、Ｔｉ酸化物：
ＴｉＯ2換算値で４０乃至５０重量％、金属炭酸塩：Ｃ
Ｏ2換算値で５．０乃至１１．０重量％、金属弗化物：
Ｆ換算値で１．０乃至４．０重量％及びＳｉ酸化物：Ｓ
ｉＯ2換算値で４乃至１０重量％を含有すると共に、Ｎ
ｉ粉、Ｃｒ粉、Ｍｎ粉及びＭｏ粉からなる群から選択さ
れた少なくとも１種の金属粉が総量で３５重量％以下に
規制された被覆剤を、溶接棒全重量あたり、２５乃至６
０重量％の被覆率で心線に被覆したものであって、溶接
棒全重量あたり、Ｔｉ：０．２乃至２重量％を含有し、
Ｂｉが０．０１重量％未満、Ｐｂが０．０１重量％未
満、Ｓが０．０１重量％未満及びＮが０．０５重量％未
満に規制されていることを特徴とする。The coated arc welding rod for stainless steel welding according to the present invention is a coated arc welding rod in which a coating is applied to the surface of a core wire made of Ni-Cr stainless steel. Per total weight, Ti oxide:
40 to 50% by weight in terms of TiO 2 , metal carbonate: C
5.0 to 11.0% by weight in terms of O 2 , metal fluoride:
1.0 to 4.0% by weight in terms of F and Si oxide: S
It contains 4 to 10% by weight in terms of iO 2 and N
A coating agent in which at least one metal powder selected from the group consisting of i powder, Cr powder, Mn powder and Mo powder is regulated to a total amount of 35% by weight or less is coated with 25 to 6 parts by weight based on the total weight of the welding rod.
A core wire coated at a coverage of 0% by weight, containing 0.2 to 2% by weight of Ti based on the total weight of the welding rod;
Bi is less than 0.01% by weight, Pb is less than 0.01% by weight, S is less than 0.01% by weight and N is less than 0.05% by weight.
【０００９】この被覆剤は、被覆剤全重量あたり、Ｔ
ｉ：０．７乃至５重量％含有することが好ましい。[0009] This coating agent, based on the total weight of the coating agent, T
i: It is preferable to contain 0.7 to 5% by weight.
【００１０】[0010]
【発明の実施の形態】通常、被覆アーク溶接棒を使用し
た溶接により得られた溶接金属に高温引張試験を実施す
ると、引張強さ及び０．２％耐力は、試験温度の上昇に
伴って緩やかに下降する。この現象において、溶接棒中
のＢｉ及びＰｂ等の低融点酸化物の有無による影響は殆
ど認められない。また、溶接金属の伸びについては、通
常、試験温度が約６５０℃までは緩やかに下降するが、
更に試験温度が上昇すると、溶接金属の伸びは向上する
傾向にある。DESCRIPTION OF THE PREFERRED EMBODIMENTS Normally, when a high-temperature tensile test is carried out on a weld metal obtained by welding using a covered arc welding rod, the tensile strength and 0.2% proof stress gradually decrease with increasing test temperature. Descends. In this phenomenon, there is almost no effect due to the presence or absence of low melting point oxides such as Bi and Pb in the welding rod. In addition, as for the elongation of the weld metal, usually, the test temperature gradually decreases until the test temperature reaches about 650 ° C.,
As the test temperature further increases, the elongation of the weld metal tends to increase.
【００１１】しかしながら、溶接棒中にＢｉを含有する
場合は、この伸びの回復傾向は認められない。更に、絞
りについては、溶接棒中にＢｉ等を含有する場合、試験
温度が約６５０℃になると、急激に低下する。これは、
溶接金属の粒界に偏析したＢｉ等の低融点物質が、その
融点付近まで加熱されることにより液化するためであ
る。However, when Bi is contained in the welding rod, this tendency to recover from elongation is not observed. Further, when the welding rod contains Bi or the like, the reduction sharply decreases when the test temperature reaches about 650 ° C. this is,
This is because a low-melting substance such as Bi segregated at the grain boundary of the weld metal is liquefied by being heated to a temperature close to its melting point.
【００１２】そこで、本願発明者等は、先ず、溶接金属
の高温における機械的性能とＢｉ添加量との関係を把握
するために、種々実験研究を行った結果、被覆アーク溶
接棒中のＢｉ及びＰｂ含有量を、夫々、溶接棒全重量あ
たり０．０１重量％未満にすることが効果的であるとい
う知見を得た。また、溶接金属中のＳを低減することに
より、高温における機械的性能は更に改善されることも
見い出した。このためには、被覆アーク溶接棒中のＳ含
有量を、０．０１重量％未満にする必要がある。The inventors of the present invention conducted various experimental studies in order to grasp the relationship between the mechanical performance of the weld metal at high temperatures and the amount of Bi added. It has been found that it is effective to reduce the Pb content to less than 0.01% by weight based on the total weight of the welding rod. It has also been found that the mechanical performance at high temperatures is further improved by reducing S in the weld metal. For this purpose, the S content in the coated arc welding rod needs to be less than 0.01% by weight.
【００１３】しかしながら、前述の如く、溶接棒中のＢ
ｉ及び硫黄の含有量を低減すると、全姿勢溶接を可能に
するライムチタニヤ系の被覆アーク溶接棒を使用した場
合、スラグ剥離性が著しく劣化することも確認された。
そこで、本願発明者等は、スラグ剥離性の向上に有効で
あるフラックス系及びＢｉ又は硫黄と同様の効果を有す
る他の元素を見い出すと共に、その適切な添加量及び添
加方法を得るために、鋭意研究を重ねた。その結果、被
覆アーク溶接棒中にＴｉを添加することにより、高温に
おける良好な機械的性能を保持することができると共
に、スラグ剥離性が劣化することがないステンレス鋼溶
接用被覆アーク溶接棒を得ることができた。However, as described above, B in the welding rod
It was also confirmed that when the contents of i and sulfur were reduced, slag peelability was significantly deteriorated when using a lime titania-based coated arc welding rod capable of performing all-position welding.
Therefore, the present inventors have found a flux system and other elements having the same effect as Bi or sulfur, which are effective for improving the slag removability, and have been eager to obtain an appropriate amount and method of addition. Repeated research. As a result, by adding Ti to the coated arc welding rod, it is possible to maintain good mechanical performance at high temperatures and obtain a coated arc welding rod for stainless steel welding in which the slag peeling property does not deteriorate. I was able to.
【００１４】以下、本発明におけるステンレス鋼溶接用
被覆アーク溶接棒の被覆剤に含有される化学成分及びそ
の組成限定理由について説明する。Hereinafter, the chemical components contained in the coating agent of the coated arc welding rod for stainless steel welding in the present invention and the reasons for limiting the composition will be described.
【００１５】Ｔｉ酸化物：ＴｉＯ2換算値で４０乃至５
０重量％ Ｔｉ酸化物には、アークの安定性を向上させると共に、
再アーク性を良好にする効果も有する。また、スラグに
適切な流動性を与えて、ビード形状を向上させる効果も
有している。これらの効果を得るためには、溶接棒の被
覆剤中に、Ｔｉ酸化物を被覆剤全重量あたり、ＴｉＯ2
換算値で４０重量％以上添加する必要がある。一方、被
覆剤中へのＴｉ酸化物の添加量がＴｉＯ2換算値で５０
重量％を超えると、スラグの流動性が過剰になって、立
向溶接及び上向溶接が困難になると共に、スラグが固く
なって剥離性が低下してしまう。従って、被覆剤中のＴ
ｉ酸化物の含有量は、被覆剤全重量あたりＴｉＯ2換算
値で４０乃至５０重量％とする。なお、Ｔｉ酸化物源と
しては、ルチール、イルミナイト、チタン酸カリウム及
びチタン酸カルシウム等がある。 Ti oxide: 40 to 5 in terms of TiO 2
0 wt% Ti oxide improves arc stability and
It also has the effect of improving the re-arc property. It also has the effect of giving the slag appropriate fluidity and improving the bead shape. In order to obtain these effects, in the coating of the welding rod, Ti oxide is added to TiO 2 based on the total weight of the coating.
It is necessary to add 40% by weight or more as a converted value. On the other hand, the amount of Ti oxide added to the coating material is 50 in terms of TiO 2.
If the content is more than 10% by weight, the fluidity of the slag becomes excessive, making the vertical welding and the upward welding difficult, and the slag becomes hard and the peelability decreases. Therefore, T in the coating
The content of the i-oxide is set to 40 to 50% by weight in terms of TiO 2 based on the total weight of the coating agent. The Ti oxide source includes rutile, illuminite, potassium titanate, calcium titanate, and the like.
【００１６】金属炭酸塩：ＣＯ2換算値で５．０乃至１
１．０重量％ 被覆剤中に金属炭酸塩を添加すると、溶接中に発生する
ＣＯ2ガスのシールド効果によってブローホール及びピ
ット等の溶接欠陥の発生を抑制することができると共
に、スラグの塩基度を上げて溶接金属中のＳ量を低減す
ることができる。被覆剤中の金属炭酸塩の含有量が被覆
剤全重量あたり、ＣＯ2換算値で５．０重量％未満であ
ると、十分な効果を得ることができない。一方、被覆剤
中の金属炭酸塩の含有量が被覆剤全重量あたり、ＣＯ2
換算値で１１．０重量％を超えると、スパッタの発生量
が増加して、溶接作業性が悪くなる。従って、被覆剤中
の金属炭酸塩の含有量は、被覆剤全重量あたり、ＣＯ2
換算値で５．０乃至１１．０重量％とする。なお、金属
炭酸塩としては、石灰石、炭酸バリウム、炭酸マグネシ
ウム及び炭酸マンガン等がある。 Metal carbonate: 5.0 to 1 in terms of CO 2
When a metal carbonate is added to the 1.0% by weight coating agent, the generation of welding defects such as blowholes and pits can be suppressed by the shielding effect of CO 2 gas generated during welding, and the basicity of slag can be suppressed. And the amount of S in the weld metal can be reduced. If the content of the metal carbonate in the coating agent is less than 5.0% by weight in terms of CO 2 based on the total weight of the coating agent, a sufficient effect cannot be obtained. On the other hand, the content of the metal carbonate in the coating agent is a coating agent total weight per, CO 2
If the converted value exceeds 11.0% by weight, the amount of spatter generated increases, and welding workability deteriorates. Therefore, the content of the metal carbonate in the coating material is expressed as CO 2 / CO 2
The converted value is 5.0 to 11.0% by weight. The metal carbonate includes limestone, barium carbonate, magnesium carbonate, manganese carbonate and the like.
【００１７】金属弗化物：Ｆ換算値で１．０乃至４．０
重量％ 被覆剤中に金属弗化物を添加すると、アークの吹き付け
を強く広げる効果を得ることができる。被覆剤全重量あ
たりの金属弗化物の含有量が、Ｆ換算値で１．０重量％
未満であると、この効果を得ることができない。一方、
被覆剤中の金属弗化物の含有量が、Ｆ換算値で４．０重
量％を超えると、アークが不安定になって、スパッタ発
生量が増加すると共に、棒焼け現象が顕著に発生する。
従って、被覆剤中の金属弗化物の含有量は、被覆剤全重
量あたり、Ｆ換算値で１．０乃至４．０重量％とする。
なお、金属弗化物源としては、蛍石、氷晶石、弗化ナト
リウム、弗化バリウム及び弗化ストロンチウム等があ
る。 Metal fluoride: 1.0 to 4.0 in terms of F
When metal fluoride is added to the coating agent by weight, an effect of strongly spreading the arc can be obtained. The content of metal fluoride based on the total weight of the coating agent is 1.0% by weight in terms of F.
If it is less than this, this effect cannot be obtained. on the other hand,
If the content of the metal fluoride in the coating agent exceeds 4.0% by weight in terms of F, the arc becomes unstable, the amount of spatters increases, and the sticking phenomenon occurs remarkably.
Therefore, the content of the metal fluoride in the coating agent is set to 1.0 to 4.0% by weight in terms of F based on the total weight of the coating agent.
The metal fluoride source includes fluorite, cryolite, sodium fluoride, barium fluoride, strontium fluoride, and the like.
【００１８】Ｓｉ酸化物：ＳｉＯ2換算値で４乃至１０
重量％ 被覆剤中にＳｉＯ2源を添加すると、スラグの粘性が高
められて、ビード形状が良好になると共に、アークに集
中性を与える効果を得ることができる。被覆剤中のＳｉ
酸化物がＳｉＯ2換算値で、被覆剤全重量あたり４重量
％未満であると、その効果を十分に得ることができな
い。一方、Ｓｉ酸化物がＳｉＯ2換算値で、１０重量％
を超えると、スラグの流動性が悪くなってビード形状が
劣化すると共に、スラグの焼き付きの発生により剥離性
が低下する。従って、被覆剤中のＳｉ酸化物は、被覆剤
全重量あたり、ＳｉＯ2換算値で４乃至１０重量％とす
る。なお、Ｓｉ酸化物源としては、珪砂、マイカ、長石
及び珪灰石等の珪酸塩化合物があり、また、フラックス
を捏和する際に増粘剤として添加する水ガラス中の珪酸
塩も含まれる。 Si oxide: 4 to 10 in terms of SiO 2
When the SiO 2 source is added to the weight% coating agent, the viscosity of the slag is increased, the bead shape is improved, and the effect of concentrating the arc can be obtained. Si in coating
If the oxide content is less than 4% by weight based on the total weight of the coating agent in terms of SiO 2 , the effect cannot be sufficiently obtained. On the other hand, the content of Si oxide was 10% by weight in terms of SiO 2.
If it exceeds, the fluidity of the slag deteriorates, the bead shape deteriorates, and the seizure of the slag reduces the releasability. Therefore, the content of the Si oxide in the coating material is 4 to 10% by weight in terms of SiO 2 based on the total weight of the coating material. The Si oxide source includes silicate compounds such as silica sand, mica, feldspar and wollastonite, and also includes silicate in water glass added as a thickener when kneading the flux.
【００１９】Ｎｉ粉、Ｃｒ粉、Ｍｎ粉及びＭｏ粉からな
る群から選択された少なくとも１種の金属粉の総量：３
５重量％以下 本発明において、被覆剤中に添加される金属粉は、酸化
消耗分を補って成分調整する効果を有する。この被覆剤
中への添加量は目的に応じて決定されるが、被覆剤中の
上記金属粉の総量が３５重量％を超えると、アークが弱
くなって、溶接作業性が低下する。従って、被覆剤中の
Ｎｉ粉、Ｃｒ粉、Ｍｎ粉及びＭｏ粉からなる群から選択
された少なくとも１種の金属粉は総量で、被覆剤全重量
あたり３５重量％以下とする。[0019] Ni powder, Cr powder, Mn powder and Mo powder
Total amount of at least one metal powder selected from the group: 3
5% by weight or less In the present invention, the metal powder added to the coating agent has an effect of adjusting the components by supplementing the oxidized consumption. The amount of addition to the coating agent is determined according to the purpose. However, if the total amount of the metal powder in the coating agent exceeds 35% by weight, the arc becomes weak and the welding workability decreases. Therefore, the total amount of at least one metal powder selected from the group consisting of Ni powder, Cr powder, Mn powder, and Mo powder in the coating material is 35% by weight or less based on the total weight of the coating material.
【００２０】次に、本発明におけるステンレス鋼溶接用
被覆アーク溶接棒の被覆率の限定理由について説明す
る。Next, the reason for limiting the coverage of the coated arc welding rod for stainless steel welding in the present invention will be described.
【００２１】被覆率：２５乃至６０重量％ 溶接棒全重量に対する被覆剤の重量比率を示す被覆率
は、２５重量％未満であると、アーク安定性が悪くなる
と共に、棒焼け現象が発生して保護筒が劣化するので、
良好な溶接作業性を得ることができない。一方、被覆率
が６０重量％を超えると、スラグが過剰になって、スラ
グが先行するので、開先内の溶接に不適であり、スラグ
剥離性も低下する。従って、被覆率は２５乃至６０重量
％とする。 Coverage: 25 to 60% by weight When the coverage, which indicates the weight ratio of the coating agent to the total weight of the welding rod, is less than 25% by weight, the arc stability is deteriorated and the stick burning phenomenon occurs. As the protection tube deteriorates,
Good welding workability cannot be obtained. On the other hand, if the coverage exceeds 60% by weight, the slag becomes excessive and the slag precedes, so that it is unsuitable for welding in the groove and the slag removability is reduced. Therefore, the coverage is 25 to 60% by weight.
【００２２】更に、本発明におけるステンレス鋼溶接用
被覆アーク溶接棒の全体に含有される化学成分及びその
組成限定理由について説明する。Further, the chemical components contained in the entire coated arc welding rod for stainless steel welding according to the present invention and the reasons for limiting the composition will be described.
【００２３】Ｂｉ：０．０１重量％未満 図１は縦軸に溶接金属の伸び・絞りをとり、横軸に試験
温度をとって、溶接棒中のＢｉ含有量が溶接金属の機械
的性能に与える影響を示すグラフ図である。但し、図１
中において、○はＢｉ含有量が０．０１重量％以下、●
はＢｉ含有量が０．０５重量％である溶接棒を使用した
場合の溶接金属の伸びを示し、△はＢｉ含有量が０．０
１重量％以下、▲はＢｉ含有量が０．０５重量％である
溶接棒を使用した場合の溶接金属の絞りを示す。 Bi: less than 0.01% by weight FIG. 1 shows the elongation / drawing of the weld metal on the vertical axis and the test temperature on the horizontal axis, and the Bi content in the welding rod determines the mechanical performance of the weld metal. It is a graph which shows the influence which it has. However, FIG.
In the graph, ○ indicates that the Bi content is 0.01% by weight or less;
Indicates the elongation of the weld metal when a welding rod having a Bi content of 0.05% by weight is used, and △ indicates that the Bi content is 0.0
1% by weight or less, ▲ indicates the reduction of the weld metal when using a welding rod having a Bi content of 0.05% by weight.
【００２４】図１に示すように、Ｂｉ含有量が０．０５
重量％である溶接棒を使用した場合、得られる溶接金属
の伸び及び絞り等の機械的性能は、６５０℃以上の温度
領域において急激に劣化する。溶接棒中のＢｉ含有量が
０．０１重量％を超えると、この高温における機械的性
能の劣化現象が起こり、この劣化現象は、フラックス中
にＢｉを含有する場合と、心線中にＢｉを含有する場合
との双方で確認される。従って、被覆アーク溶接棒中の
Ｂｉ含有量は、溶接棒全重量あたり０．０１重量％未満
に規制する。As shown in FIG. 1, the Bi content is 0.05
When a welding rod having a percentage by weight is used, the mechanical properties such as elongation and drawing of the obtained weld metal rapidly deteriorate in a temperature range of 650 ° C. or higher. If the Bi content in the welding rod exceeds 0.01% by weight, a mechanical performance deterioration phenomenon at this high temperature occurs. This deterioration phenomenon is caused by the case where Bi is contained in the flux and the case where Bi is contained in the core wire. Confirmed in both cases. Therefore, the Bi content in the coated arc welding rod is restricted to less than 0.01% by weight based on the total weight of the welding rod.
【００２５】Ｐｂ：０．０１重量％未満 溶接棒中のＰｂ含有量が０．０１重量％を超えると、得
られる溶接金属の伸び及び絞り等の機械的性能が、６５
０℃以上の温度領域において急激に劣化する。この高温
における機械的性能の劣化現象は、フラックス中にＰｂ
を含有する場合と、心線中にＰｂを含有する場合との双
方で確認される。従って、被覆アーク溶接棒中のＰｂ含
有量は、溶接棒全重量あたり０．０１重量％未満に規制
する。 Pb: less than 0.01% by weight When the Pb content in the welding rod exceeds 0.01% by weight, the mechanical properties such as elongation and drawing of the obtained weld metal are 65%.
It deteriorates rapidly in a temperature range of 0 ° C. or higher. The deterioration phenomenon of the mechanical performance at this high temperature is caused by Pb in the flux.
And the case where Pb is contained in the core wire. Therefore, the Pb content in the coated arc welding rod is restricted to less than 0.01% by weight based on the total weight of the welding rod.
【００２６】Ｓ：０．０１重量％未満 本発明においては、前述の如く、溶接金属中のＳ（硫
黄）含有量を低減することにより、溶接金属の高温にお
ける機械的性能を改善する効果を得ることができる。溶
接棒中のＳ含有量が、溶接棒全重量あたり０．０１重量
％以上であると、この効果を得ることができない。従っ
て、溶接棒中のＳ含有量は、溶接棒全重量あたり０．０
１重量％未満に規制する。なお、近時の精錬技術の発展
に伴って、ステンレス鋼中のＳ含有量は、極めて低いも
のとなっており、約数１０ｐｐｍである。また、フラッ
クス中においては、Ｓは金属粉及びルチール中の不純物
等から混入する。 S: less than 0.01% by weight In the present invention, as described above, the effect of improving the mechanical performance of the weld metal at high temperatures is obtained by reducing the S (sulfur) content in the weld metal. be able to. This effect cannot be obtained if the S content in the welding rod is 0.01% by weight or more based on the total weight of the welding rod. Therefore, the S content in the welding rod is 0.0
Restrict to less than 1% by weight. With the recent development of refining technology, the S content in stainless steel has become extremely low, and is about several tens of ppm. In the flux, S is mixed in from metal powder and impurities in rutile.
【００２７】Ｎ：０．０５重量％未満 窒素は、主に、被覆アーク溶接棒の心線中に含有される
が、このＮ含有量が溶接棒全重量あたり０．０５重量％
以上であると、スラグがビードの表面に焼き付き、剥離
性が著しく劣化する。従って、溶接棒中のＮ含有量は、
溶接棒全重量あたり０．０５重量％未満に規制する。 N: less than 0.05% by weight Nitrogen is mainly contained in the core wire of the coated arc welding rod, and this N content is 0.05% by weight based on the total weight of the welding rod.
If it is above, the slag is seized on the surface of the bead, and the releasability is significantly deteriorated. Therefore, the N content in the welding rod is
Regulate to less than 0.05% by weight based on the total weight of the welding rod.
【００２８】Ｔｉ：０．２乃至２重量％ 一般的に、金属Ｔｉ及びＦｅ−Ｔｉ合金等のＴｉ合金
は、溶接金属中の脱酸を目的として溶接棒中に添加され
ているが、本願発明者等は、スラグ剥離剤を抑制した本
発明に係る被覆アーク溶接棒において、Ｔｉはスラグ剥
離性を改善するための必要不可欠の元素であることを見
い出した。被覆アーク溶接棒中のＴｉ含有量が、溶接棒
全重量あたり０．２重量％未満であると、この効果を十
分に得ることができない。一方、Ｔｉ含有量が２重量％
を超えると、スパッタの発生量が増加し、溶接作業性が
低下する。従って、溶接棒中のＴｉ含有量は、溶接棒全
重量あたり０．２乃至２重量％とする。なお、このＴｉ
は、心線中に含有されるＴｉ以外に、フラックス中に金
属Ｔｉ及びＦｅ−Ｔｉ合金等として添加することができ
る。しかし、Ｔｉ酸化物としてフラックス中に添加して
も、スラグ剥離性を向上させる効果を得ることはできな
いので、Ｔｉ酸化物はＴｉとして換算しないものとす
る。 Ti: 0.2 to 2% by weight In general, metallic Ti and Ti alloys such as Fe—Ti alloys are added to a welding rod for the purpose of deoxidizing a weld metal. The present inventors have found that Ti is an indispensable element for improving the slag stripping property in the coated arc welding rod according to the present invention in which the slag stripping agent is suppressed. If the Ti content in the coated arc welding rod is less than 0.2% by weight based on the total weight of the welding rod, this effect cannot be sufficiently obtained. On the other hand, the Ti content is 2% by weight.
If it exceeds, the amount of spatters generated will increase and the welding workability will decrease. Therefore, the Ti content in the welding rod is set to 0.2 to 2% by weight based on the total weight of the welding rod. Note that this Ti
Can be added to the flux as metal Ti and an Fe-Ti alloy in addition to Ti contained in the core wire. However, even if added to the flux as Ti oxide, the effect of improving slag removability cannot be obtained, so that Ti oxide is not converted to Ti.
【００２９】また、本発明においては、被覆剤中のＴｉ
含有量を規定すると、より一層溶接作業性を向上させる
ことができる。以下に、その規定範囲及び限定理由につ
いて説明する。Further, in the present invention, Ti in the coating agent is used.
When the content is defined, the welding workability can be further improved. Hereinafter, the prescribed range and the reason for limitation will be described.
【００３０】被覆剤中のＴｉ：０．７乃至５重量％ 前述の如く、溶接棒中にＴｉを添加することにより、溶
接金属のスラグ剥離性を向上させる効果を得ることがで
きるが、特に、被覆剤中のＴｉ含有量が、被覆剤全重量
あたり０．７乃至５重量％であると、スラグ剥離性をよ
り一層高めることができる。被覆剤中のＴｉ含有量が
０．７重量％未満であると、この効果を十分に得ること
ができない。一方、被覆剤中のＴｉ含有量が５重量％を
超えると、溶接作業性が低下することがある。従って、
被覆剤中のＴｉ含有量は、被覆剤全重量あたり０．７乃
至５重量％であることが好ましい。なお、このＴｉは、
金属Ｔｉ及びＦｅ−Ｔｉ合金等により、被覆剤中に添加
することができる。 Ti in the coating agent: 0.7 to 5% by weight As described above, the effect of improving the slag removability of the weld metal can be obtained by adding Ti to the welding rod. When the Ti content in the coating agent is 0.7 to 5% by weight based on the total weight of the coating agent, the slag removability can be further improved. If the Ti content in the coating agent is less than 0.7% by weight, this effect cannot be sufficiently obtained. On the other hand, when the Ti content in the coating agent exceeds 5% by weight, welding workability may be reduced. Therefore,
The Ti content in the coating is preferably 0.7 to 5% by weight based on the total weight of the coating. This Ti is
Metal Ti and Fe-Ti alloy can be added to the coating agent.
【００３１】本発明においては、上述の如く組成が規定
された被覆アーク溶接棒を使用して溶接するので、スラ
グ剥離性が優れていると共に、高温における機械的性能
が良好である溶接金属を得ることができる。なお、本発
明において使用される心線は、溶着金属がＪＩＳ Ｚ３
２２１に規定されているＮｉ−Ｃｒ系ステンレス鋼の組
成と同一の組成となるように調整されていると共に、Ｂ
ｉ、Ｐｂ、Ｓ及びＮが上記値を満足するように抑制され
たものである。In the present invention, since welding is performed using a covered arc welding rod having a composition defined as described above, a weld metal having excellent slag peeling properties and good mechanical performance at high temperatures is obtained. be able to. In addition, the core wire used in the present invention is such that the deposited metal is JIS Z3.
221 is adjusted so as to have the same composition as the composition of the Ni—Cr stainless steel specified in B.221.
i, Pb, S and N are suppressed so as to satisfy the above values.
【００３２】[0032]
【実施例】以下、本発明に係るステンレス鋼溶接用被覆
アーク溶接棒の実施例についてその比較例と比較して具
体的に説明する。EXAMPLES Examples of the coated arc welding rod for stainless steel welding according to the present invention will be specifically described below in comparison with comparative examples.
【００３３】先ず、下記表１及び２に示す組成を有し、
直径が４．０ｍｍ、長さが３５０ｍｍである心線に、下
記表３乃至７に示す組成を有する被覆剤を塗布して被覆
アーク溶接棒を作製した後、溶接棒全体における特定元
素の含有量を測定した。これを下記表８に示す。そし
て、各被覆アーク溶接棒により、１３５Ａの電流で交流
電源を使用して水平隅肉溶接を実施し、溶接作業性を評
価した。First, it has the composition shown in Tables 1 and 2 below,
A coating agent having a composition shown in Tables 3 to 7 below was applied to a core wire having a diameter of 4.0 mm and a length of 350 mm to prepare a coated arc welding rod, and then the content of a specific element in the entire welding rod. Was measured. This is shown in Table 8 below. Then, horizontal fillet welding was performed with each of the coated arc welding rods at a current of 135 A using an AC power supply, and welding workability was evaluated.
【００３４】また、厚さが１２ｍｍである軟鋼板によっ
て、開先角度が４５°、ルートギャップが６ｍｍである
開先部を有する溶接母材を作製し、各被覆アーク溶接棒
を使用して、前記開先部を５層９パスで溶接した。な
お、開先部には、使用する溶接棒によって、予め２層バ
タリング溶接を施した。その後、ＪＩＳ Ｚ３１１１に
準じて、得られた溶接金属から直径が６ｍｍで標点距離
が３０ｍｍである引張試験片を採取し、高温における機
械的性能評価として、７００℃の温度で引張試験を実施
し、破断伸び及び絞りを測定した。A welding base metal having a groove portion having a groove angle of 45 ° and a root gap of 6 mm was prepared from a mild steel plate having a thickness of 12 mm, and each coated arc welding rod was used. The groove was welded with 5 layers and 9 passes. The groove portion was previously subjected to two-layer buttering welding with a welding rod to be used. Thereafter, a tensile test specimen having a diameter of 6 mm and a gauge length of 30 mm was sampled from the obtained weld metal according to JIS Z3111, and a tensile test was performed at a temperature of 700 ° C. as a mechanical performance evaluation at a high temperature. , Elongation at break, and drawing were measured.
【００３５】これらの評価結果を下記表９に示す。但
し、表中の評価結果欄において、◎は極めて優れている
ことを示し、○は実用上問題にならない程度に良好、△
はやや不良、×は実用が不可能であることを示してい
る。The results of these evaluations are shown in Table 9 below. However, in the evaluation result column in the table, ◎ indicates extremely excellent, and ○ indicates good enough to cause no practical problem.
Slightly poor, x indicates that practical use is impossible.
【００３６】[0036]
【表１】 [Table 1]
【００３７】[0037]
【表２】 [Table 2]
【００３８】[0038]
【表３】 [Table 3]
【００３９】[0039]
【表４】 [Table 4]
【００４０】[0040]
【表５】 [Table 5]
【００４１】[0041]
【表６】 [Table 6]
【００４２】[0042]
【表７】 [Table 7]
【００４３】[0043]
【表８】 [Table 8]
【００４４】[0044]
【表９】 [Table 9]
【００４５】上記表１乃至９に示すように、実施例Ｎ
ｏ．１乃至１０は本発明において規定した組成範囲を満
足しているものであるので、溶接作業性及びスラグ剥離
性が良好であると共に、高温における機械的性能も良好
なものとなった。特に、実施例Ｎｏ．１乃至８は、被覆
剤中のＴｉ含有量が本発明の好ましい範囲内であるの
で、溶接作業性がより一層向上した。As shown in Tables 1 to 9 above, Example N
o. Since 1 to 10 satisfy the composition range specified in the present invention, the welding workability and the slag peeling property are good, and the mechanical performance at high temperatures is also good. In particular, in Example No. In Nos. 1 to 8, welding workability was further improved because the Ti content in the coating agent was within the preferred range of the present invention.
【００４６】一方、比較例Ｎｏ．１１は、被覆剤中のＴ
ｉ酸化物(ＴｉＯ2換算値）が本発明範囲の下限未満であ
るので、アークの安定性及びビード形状が劣化した。ま
た、金属粉の総量が本発明範囲の上限を超えているの
で、アークの強さが不十分となって溶接作業性が低下
し、更に、被覆率が本発明範囲の上限を超えているの
で、スラグ剥離性が低下した。比較例Ｎｏ．１２は、被
覆剤中のＴｉ酸化物（ＴｉＯ2換算値）が本発明範囲の
上限を超えているので、スラグ剥離性が低下し、また、
被覆剤中の金属弗化物（Ｆ換算値）が本発明範囲の上限
を超えているので、アークの安定性が劣化すると共に、
スパッタ発生量が増加した。更に、溶接棒中のＴｉ含有
量が本発明範囲の下限未満であるので、特に、スラグ剥
離性が低下した。On the other hand, in Comparative Example No. 11 is T in the coating agent.
Since the i-oxide (TiO 2 conversion value) was less than the lower limit of the range of the present invention, the stability of the arc and the bead shape were deteriorated. In addition, since the total amount of the metal powder exceeds the upper limit of the present invention range, the arc strength is insufficient, the welding workability is reduced, and further, since the coverage exceeds the upper limit of the present invention range. And the slag removability was reduced. Comparative Example No. No. 12, since the Ti oxide (TiO 2 equivalent value) in the coating agent exceeds the upper limit of the range of the present invention, the slag removability is reduced, and
Since the metal fluoride (F conversion value) in the coating agent exceeds the upper limit of the range of the present invention, the arc stability is deteriorated and
Spatter generation increased. Furthermore, since the Ti content in the welding rod was less than the lower limit of the range of the present invention, the slag removability was particularly reduced.
【００４７】比較例Ｎｏ．１３は、被覆剤中の金属弗化
物（Ｆ換算値）が本発明範囲の下限未満であるので、ア
ークの強さ・広がりが劣化し、溶接棒中のＢｉ含有量が
本発明範囲の上限を超えているので、７００℃における
伸び及び絞りが著しく低下した。比較例Ｎｏ．１４は、
被覆剤中の金属炭酸塩（ＣＯ2換算値）が本発明範囲の
上限を超えているので、スラグ剥離性が低下し、溶接棒
中のＰｂ含有量も本発明範囲の上限を超えているので、
７００℃における伸び及び絞りが著しく低下した。比較
例Ｎｏ．１５は、被覆剤中の金属炭酸塩（ＣＯ2換算
値）が本発明範囲の下限未満であるので、シールド効果
が不十分となると共に、脱硫効果が低下した。また、溶
接棒中のＳ含有量が本発明範囲の上限を超えているの
で、７００℃における伸び及び絞りが著しく低下した。Comparative Example No. In No. 13, since the metal fluoride (F conversion value) in the coating agent is less than the lower limit of the present invention range, the strength and spread of the arc are deteriorated, and the Bi content in the welding rod sets the upper limit of the present invention range. As a result, the elongation at 700 ° C. and the drawing were significantly reduced. Comparative Example No. 14 is
Since the metal carbonate (equivalent to CO 2 ) in the coating agent exceeds the upper limit of the range of the present invention, the slag releasability decreases, and the Pb content in the welding rod also exceeds the upper limit of the present invention. ,
The elongation at 700 ° C. and the drawing were significantly reduced. Comparative Example No. In No. 15, since the metal carbonate (in terms of CO 2 ) in the coating agent was less than the lower limit of the range of the present invention, the shielding effect was insufficient and the desulfurization effect was reduced. Further, since the S content in the welding rod exceeded the upper limit of the range of the present invention, the elongation at 700 ° C. and the drawing were significantly reduced.
【００４８】比較例Ｎｏ．１６は、被覆剤中のＳｉ酸化
物（ＳｉＯ2換算値）が本発明範囲の下限未満であるの
で、ビード形状及びアークの集中性が劣化し、溶接棒中
のＮ含有量が本発明範囲の上限を超えているので、スラ
グの剥離性が低下した。また、溶接棒中のＢｉ含有量が
本発明範囲の上限を超えているので、７００℃における
伸び及び絞りが著しく低下した。比較例Ｎｏ．１７は、
溶接棒中のＴｉ含有量が本発明範囲の上限を超えている
ので、スパッタ発生量が著しく増加した。比較例Ｎｏ．
１８は、被覆剤中のＳｉ酸化物（ＳｉＯ2換算値）が本
発明範囲の上限を超えているので、ビード形状及びスラ
グ剥離性が劣化し、また、被覆率が本発明範囲の下限未
満であるので、アーク安定性が劣化すると共に、スパッ
タ発生量が増加した。更に、溶接棒中のＳ含有量が本発
明範囲の上限を超えているので、７００℃における伸び
及び絞りが著しく低下した。Comparative Example No. In No. 16, since the Si oxide (in terms of SiO 2 ) in the coating agent was less than the lower limit of the range of the present invention, the bead shape and the arc concentration deteriorated, and the N content in the welding rod was within the range of the present invention. Since it exceeded the upper limit, the slag peelability was reduced. Further, since the Bi content in the welding rod exceeded the upper limit of the range of the present invention, the elongation at 700 ° C. and the drawing were significantly reduced. Comparative Example No. 17 is
Since the Ti content in the welding rod exceeded the upper limit of the range of the present invention, the amount of spatter generated was significantly increased. Comparative Example No.
No. 18 shows that the bead shape and the slag releasability are deteriorated because the Si oxide (in terms of SiO 2 ) in the coating agent exceeds the upper limit of the present invention, and the coating rate is less than the lower limit of the present invention. As a result, the arc stability deteriorated and the amount of spatter generated increased. Furthermore, since the S content in the welding rod exceeded the upper limit of the range of the present invention, the elongation at 700 ° C. and the drawing were significantly reduced.
【００４９】[0049]
【発明の効果】以上詳述したように、本発明によれば、
被覆剤及び溶接棒全体の化学組成及び被覆率を適切に規
定しているので、スラグ剥離性等の溶接作業性を向上さ
せることができると共に、溶着金属の高温における機械
的性能を高めることができると共に、スラグ剥離性が優
れた溶接金属を得ることができるステンレス鋼溶接用被
覆アーク溶接棒を得ることができる。また、被覆剤中の
Ｔｉ含有量を規定すると、スラグ剥離性をより一層高め
ることができる。As described in detail above, according to the present invention,
Since the chemical composition and coverage of the coating agent and the entire welding rod are appropriately defined, welding workability such as slag peeling property can be improved, and mechanical performance of the deposited metal at high temperatures can be improved. At the same time, it is possible to obtain a coated arc welding rod for stainless steel welding, which can obtain a weld metal having excellent slag removability. Further, when the Ti content in the coating agent is defined, the slag removability can be further improved.
【図１】縦軸に溶接金属の伸び・絞りをとり、横軸に試
験温度をとって、溶接棒中のＢｉ含有量が溶接金属の機
械的性能に与える影響を示すグラフ図である。FIG. 1 is a graph showing the effect of the Bi content in a welding rod on the mechanical properties of a weld metal, with the vertical axis representing the elongation / drawing of the weld metal and the horizontal axis representing the test temperature.
Claims (2)
表面に被覆剤が塗布されている被覆アーク溶接棒におい
て、被覆剤全重量あたり、Ｔｉ酸化物：ＴｉＯ2換算値
で４０乃至５０重量％、金属炭酸塩：ＣＯ2換算値で
５．０乃至１１．０重量％、金属弗化物：Ｆ換算値で
１．０乃至４．０重量％及びＳｉ酸化物：ＳｉＯ2換算
値で４乃至１０重量％を含有すると共に、Ｎｉ粉、Ｃｒ
粉、Ｍｎ粉及びＭｏ粉からなる群から選択された少なく
とも１種の金属粉が総量で３５重量％以下に規制された
被覆剤を、溶接棒全重量あたり、２５乃至６０重量％の
被覆率で心線に被覆したものであって、 溶接棒全重量あたり、Ｔｉ：０．２乃至２重量％を含有
し、Ｂｉが０．０１重量％未満、Ｐｂが０．０１重量％
未満、Ｓが０．０１重量％未満及びＮが０．０５重量％
未満に規制されていることを特徴とするステンレス鋼溶
接用被覆アーク溶接棒。1. A coated arc welding rod in which a coating agent is applied to the surface of a core wire made of Ni—Cr stainless steel, wherein, based on the total weight of the coating agent, Ti oxide: 40 to 50% by weight in terms of TiO 2. Metal carbonate: 5.0 to 11.0% by weight in terms of CO 2 , metal fluoride: 1.0 to 4.0% by weight in terms of F, and Si oxide: 4 to 10% in terms of SiO 2. Wt%, Ni powder, Cr
At least one metal powder selected from the group consisting of powder, Mn powder and Mo powder is regulated to a total amount of 35% by weight or less at a coating rate of 25 to 60% by weight based on the total weight of the welding rod. It is coated on a core wire and contains Ti: 0.2 to 2% by weight, Bi is less than 0.01% by weight, and Pb is 0.01% by weight based on the total weight of the welding rod.
, S is less than 0.01% by weight and N is 0.05% by weight
A covered arc welding rod for welding stainless steel, characterized in that the welding rod is regulated to less than.
ｉ：０．７乃至５重量％含有することを特徴とする請求
項１に記載のステンレス鋼溶接用被覆アーク溶接棒。2. The coating composition according to claim 1, wherein T is
2. The coated arc welding rod for stainless steel welding according to claim 1, wherein i is contained in an amount of 0.7 to 5% by weight.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03658897A JP3476116B2 (en) | 1997-02-20 | 1997-02-20 | Covered arc welding rod for stainless steel welding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP03658897A JP3476116B2 (en) | 1997-02-20 | 1997-02-20 | Covered arc welding rod for stainless steel welding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10230390A true JPH10230390A (en) | 1998-09-02 |
| JP3476116B2 JP3476116B2 (en) | 2003-12-10 |
Family
ID=12473947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP03658897A Expired - Lifetime JP3476116B2 (en) | 1997-02-20 | 1997-02-20 | Covered arc welding rod for stainless steel welding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3476116B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU760541B2 (en) * | 2000-05-17 | 2003-05-15 | Hobart Brothers Company | Weld wire with enhanced slag removal |
-
1997
- 1997-02-20 JP JP03658897A patent/JP3476116B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU760541B2 (en) * | 2000-05-17 | 2003-05-15 | Hobart Brothers Company | Weld wire with enhanced slag removal |
| US6608284B1 (en) | 2000-05-17 | 2003-08-19 | Illinois Tool Works Inc. | Weld wire with enhanced slag removal |
| US8119951B2 (en) | 2000-05-17 | 2012-02-21 | Hobart Brothers Company | Weld wire with enhanced slag removal |
| US8158907B2 (en) | 2000-05-17 | 2012-04-17 | Hobart Brothers Company | Weld wire with enhanced slag removal |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3476116B2 (en) | 2003-12-10 |
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