JPS61216890A - Low-hydrogen type coated electrode - Google Patents

Low-hydrogen type coated electrode

Info

Publication number
JPS61216890A
JPS61216890A JP5755685A JP5755685A JPS61216890A JP S61216890 A JPS61216890 A JP S61216890A JP 5755685 A JP5755685 A JP 5755685A JP 5755685 A JP5755685 A JP 5755685A JP S61216890 A JPS61216890 A JP S61216890A
Authority
JP
Japan
Prior art keywords
coating
amount
aluminum oxide
welding
hydrogen
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.)
Pending
Application number
JP5755685A
Other languages
Japanese (ja)
Inventor
Kunihide Yamane
山根 国秀
Takeshi Koshio
小塩 威
Isao Nagano
長野 功
Naoaki Matsutani
松谷 直明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nippon Steel Corp
Original Assignee
Nippon Steel Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP5755685A priority Critical patent/JPS61216890A/en
Publication of JPS61216890A publication Critical patent/JPS61216890A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To obtain a deposited metal of extra low hydrogen and to improve considerably the binding property of coating by adding aluminum oxide of which the grain size and content are limited at a prescribed ratio into a coating material for a low hydrogen type coated electrode. CONSTITUTION:The aluminum oxide contg. >=95% of <=5mum grain size is added at 0.5-10wt% into the coating material, by which the low hydrogen type coated electrode is produced. The low hydrogen type coated electrode which yields the weld metal of the extra low hydrogen and is improved remarkably in the binding property of coating is thus obtd.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は低水素系被覆アーク溶接棒に関し、特に極低水
素の溶着金属を与えるように改善して継手性能を高める
とともに被覆の固着塵を大幅に向上させた低水素系被覆
アーク溶接棒に関するものである。
Detailed Description of the Invention (Industrial Application Field) The present invention relates to a low-hydrogen coated arc welding rod, and in particular improves the weld metal to provide an extremely low hydrogen content to improve joint performance and eliminate dust stuck to the coating. This invention relates to a significantly improved low-hydrogen coated arc welding rod.

(従来の技術) 船舶や橋梁、プラントなどの陸上構造物の大型化にとも
なりて、50キロ級以上の高張力鋼材の使用が増加して
いるが、この種の鋼材では母材の強度が高められている
ため溶接継手部に要求される強度基準も必然的に高めら
れている。そしてとのよ5な強度部材の溶接には拡散性
水素による耐おくれ割れ性の低下を抑制するために、一
般に低水素系被覆アーク溶接棒が使用されているが、防
錆塗料塗装鋼板の溶接では鋼板に塗布された防錆塗料あ
るいは母材に付着している水分、油、さびなどに起因し
て発生する水素ガスによって、前記おくれ割れが発生し
たり7’er−ホールやピットが生成するので、従来よ
り更に拡散性水素量の低い溶着部が得られる低水素系被
覆アーク溶接棒が望まれている。
(Prior technology) As land structures such as ships, bridges, and plants become larger, the use of high-strength steel materials of 50 kg class or more is increasing. Because of this, the strength standards required for welded joints have also inevitably been raised. When welding high-strength components, low-hydrogen coated arc welding rods are generally used to prevent deterioration of cracking resistance due to diffusible hydrogen, but welding of steel plates coated with anti-corrosion paint is common. In this case, hydrogen gas generated due to anti-rust paint applied to the steel plate or moisture, oil, rust, etc. adhering to the base material causes the above-mentioned cracks, 7'er-holes, and pits. Therefore, there is a need for a low-hydrogen coated arc welding rod that can provide a welded part with an even lower amount of diffusible hydrogen than before.

従来から被覆アーク溶接による溶接金属の拡散性水素量
を低減させるために溶接棒に対して試みられた方法とし
て、溶接棒を高温で焼成して被覆剤中の結晶水分および
吸湿水分を分解放出させる処理方法、あるいは原材料を
厳選して水分含有量の少ない被覆剤を使用する方法があ
る。しかしながら前者においては高温度で焼成すると水
素量の低減は図れるものの固着剤である水ガラスが分解
するために被覆の固着力が弱まり1.輸送中に被覆がは
く離脱落したり溶接中に被覆が欠は落ちたりする原因と
なる。また後者においては被覆剤の特性上全く水分を含
まない鉱物を用いることは実際上極めて困難なことであ
り、その使用においておのずから限界がある。このよう
な問題に対して被覆アーク溶接棒の製造条件、特に乾燥
条件を改善したものとして例えば舟開昭58−1282
56号公報に示されるようKC02雰囲気中で乾燥する
ことによって極低水素化を計ったものがあるが、特別の
乾燥設備が必要でありコスト高となって一般的でない。
In order to reduce the amount of diffusible hydrogen in the weld metal during coated arc welding, a method that has been attempted for welding rods is to sinter the welding rod at high temperatures to decompose and release crystalline water and hygroscopic water in the coating material. There are processing methods, or methods of carefully selecting raw materials and using coating materials with low moisture content. However, in the former case, although the amount of hydrogen can be reduced by firing at high temperatures, the adhesion of the coating is weakened due to the decomposition of water glass, which is the adhesion agent.1. This may cause the coating to peel off during transportation or break off during welding. Furthermore, in the latter case, it is actually extremely difficult to use minerals that do not contain any water due to the characteristics of the coating material, and there are limits to their use. To solve this problem, the manufacturing conditions, especially the drying conditions, of coated arc welding rods have been improved, for example, in Funakai 58-1282.
As shown in Japanese Patent No. 56, there is a method that achieves extremely low hydrogenation by drying in a KC02 atmosphere, but this is not common because it requires special drying equipment and is expensive.

さらにまた被覆剤を改善したもの例えば特開昭55−1
39900号公報では微粒シリカを用い耐吸湿性、を向
上せしめた被覆アーク溶接棒があるが、溶着金属中に8
1が過剰に還元され機械的性質特に衝撃値が劣化する問
題がある。
Furthermore, products with improved coating materials, such as JP-A-55-1
No. 39900 discloses a coated arc welding rod with improved moisture absorption resistance using fine silica particles, but
There is a problem in that 1 is excessively reduced and the mechanical properties, particularly the impact value, deteriorate.

(発明が解決しようとする問題点) 本発明は前述のような事情に着目してなされたものであ
りて溶接条件の如何にかかわらず安定して溶接金属の拡
散性水素量を大幅に低減させ、継手性能を高めるととも
に被覆の固着性を向上させた低水素系被覆アーク溶接棒
を提供するものである。
(Problems to be Solved by the Invention) The present invention has been made in view of the above-mentioned circumstances, and is capable of stably and significantly reducing the amount of diffusible hydrogen in weld metal regardless of the welding conditions. The present invention provides a low hydrogen-based coated arc welding rod that has improved joint performance and coating adhesion.

(問題点を解決するための手段) 本発明にかかわる低水素系被覆アーク溶接棒は、粒径5
μm以下を95チ以上含有する酸化アルミニウムを被覆
剤中に重f/”−セントで0.5〜10チ添加した点に
要旨が存在し、被覆剤中の他の成分に関しては実質上如
何なる制限も存在せず、夫々の目的に沿って最適の成分
を配合することができる。
(Means for solving the problem) The low hydrogen-based coated arc welding rod according to the present invention has a grain size of 5
The gist is that aluminum oxide containing 95 or more μm or less is added to the coating material at a weight of 0.5 to 10 grams, and there are virtually no restrictions regarding other components in the coating material. There is no such thing, and the optimal ingredients can be blended according to each purpose.

以下に本発明の詳細な説明する。低水素系被覆アーク溶
接棒における拡散性水素量の増加の要因として被覆剤中
に配合する含水鉱物および固着剤中の結晶水があげられ
るが、これら含水鉱物および固着剤を減少させるにはお
のずと限界があることは前に述べた。特に固着剤を減少
させると心線の回りに被覆剤を塗布するに際し塗装性が
悪化し製造困難に陥ることになる。そこで本発明者等は
固着剤を減少しても塗装性が悪化しない原材料を広汎に
わたって検討したところ、酸化アルミニウムの微粒子を
用いることによって解決できることを見出した。
The present invention will be explained in detail below. Water-containing minerals contained in the coating material and crystal water in the binder are factors that increase the amount of diffusible hydrogen in low-hydrogen coated arc welding rods, but there is a natural limit to reducing these water-containing minerals and binder. I mentioned earlier that there is. In particular, if the amount of the fixing agent is reduced, the coating properties will deteriorate when the coating material is applied around the core wire, leading to manufacturing difficulties. Therefore, the present inventors extensively investigated raw materials that would not deteriorate paintability even if the amount of the adhesive was reduced, and found that the problem could be solved by using fine particles of aluminum oxide.

すなわち本発明者らは低水素系被覆であるCaCO35
0重量%、CaF220重量%、5i42重量襲のF・
−8i 10重量%、金属Mn 5重量%を基本成分組
成としてこれに粒径5μm以下のものを95慢以上含有
せしめた酸化アルミニウムを添加範囲を徨々変えて含有
させた被覆剤に水ガラスを添加し通常用いられる溶接棒
塗装機によって4.0−の炭素鋼心線に所定塗装圧で塗
装し、450’Cで焼成して試験溶接棒を作成した。−
そして、拡散性水素量i JIS23113 K従って
175A、20℃、65%R,H,雰囲気条件で行なっ
た。
That is, the present inventors used CaCO35, which is a low hydrogen coating.
0% by weight, 220% by weight of CaF, 5i42% by weight of F・
-8i 10% by weight, 5% by weight of metal Mn as a basic component, and water glass is added to a coating material containing aluminum oxide containing 95% or more of particles with a particle size of 5 μm or less by varying the addition range. A test welding rod was prepared by coating a 4.0-carbon steel core wire at a predetermined coating pressure using a commonly used welding rod coating machine and firing at 450'C. −
The test was carried out under the following atmospheric conditions: diffusible hydrogen amount i JIS 23113 K, 175A, 20° C., 65% R, H.

これら試験結果として、被覆剤中に添加する酸化アルミ
ニウムの量、水ガラスの量、塗装圧、塗装性の判定およ
び拡散性水素量を第1表に示す。
Table 1 shows the results of these tests, including the amount of aluminum oxide added to the coating material, the amount of water glass, the coating pressure, the coating properties, and the amount of diffusible hydrogen.

第1表によると酸化アルミニウムを添加せずかつ水ガラ
スの量を減少させたものは塗装が不可能になった。しか
し、粒径5μm以下を95%以上含有する酸化アルミニ
ウムを0.5重量%以上添加することによって従来の被
覆剤の添加量に比べて約V3程度と大幅に減少できるこ
とが明らかになり、さらに拡散性水素量も約半分に低減
された。
According to Table 1, it became impossible to paint the products in which aluminum oxide was not added and the amount of water glass was reduced. However, it has become clear that by adding 0.5% by weight or more of aluminum oxide containing 95% or more of particles with a particle size of 5 μm or less, the amount can be significantly reduced to about V3 compared to the amount of conventional coating materials. The amount of hydrogen was also reduced by about half.

本発明で使用される酸化アルミニウムは超微粒子状無水
酸化アルミ、α−アルミナおよびr−アルミナなどを指
すものである。酸化アルミニウムは表面エネルギーが小
さいこと、分散性に優れていること、増粘性、潤滑性、
混合性、耐薬品性、耐候性などが優れていること等の理
由によって、最近用途研究がさかんに行なわれているも
のであるが、溶接用フラックスという用途については本
発明によって全く新規に採用されるものである。
The aluminum oxide used in the present invention refers to ultrafine particulate anhydrous aluminum oxide, α-alumina, r-alumina, and the like. Aluminum oxide has low surface energy, excellent dispersibility, thickening properties, lubricity,
Due to its excellent mixability, chemical resistance, weather resistance, etc., research on its use has been actively conducted recently, but the present invention has completely new applications for welding flux. It is something that

本発明において酸化アルミニウムの粒径を5μm以下の
ものを95%以上含有せしめるとしたのは、この粒度範
囲の酸化アルミニウムを被覆剤に添加することによって
固着剤の添加量が大幅に減少し、かつ塗装性が良好であ
り拡散性水素量が低減され防錆塗料塗装鋼板における耐
ビ、ト性も改善されるためである。さらに400℃以上
の高温焼成においても固着性が悪化せず溶接中の被覆欠
は落ちがなくなり良好な溶接作業性が得られるものであ
る。なお、酸化アルミニウムの粒径が5μm以上のもの
が5%を越えると固着剤の添加量が減少せず固着性が劣
化するとともに拡散性水素量も減少しない。
In the present invention, the reason why 95% or more of aluminum oxide is contained is that the particle size of aluminum oxide is 5 μm or less. This is because the paintability is good, the amount of diffusible hydrogen is reduced, and the corrosion resistance of the steel plate coated with anticorrosive paint is also improved. Furthermore, even when fired at a high temperature of 400° C. or higher, the adhesion does not deteriorate, and no coating loss occurs during welding, resulting in good welding workability. It should be noted that if the amount of aluminum oxide particles with a particle size of 5 μm or more exceeds 5%, the amount of the fixing agent added will not be reduced, the fixation will deteriorate, and the amount of diffusible hydrogen will not be reduced.

次に被覆剤中の添加量は5μm以下の粒径が95係以上
含有するものが0.5重量−以上あれば固着剤の添加量
が減少し、かつ固着性を改善させる効果を発揮する。そ
して配合量が増加するにつれて固着性も改善され10重
量%を越えて添加しても特にその効果は変わらないが、
溶接作業性に不都合をもたらすことが多いので本発明に
おける添加範囲を0.5重量%を下限とし、10重量%
を上限と定めた。なお、100重量を越えた場合におけ
る溶接作業性の問題としては、スラグの融点が高くなり
すぎ母材と溶接金属とのなじみ性が劣化したり、スノッ
タが多くなる他、アークがあらくなるなどの問題が観察
された。
Next, if the amount added in the coating material is 0.5 weight or more containing particles with a particle size of 5 μm or less and a coefficient of 95 or more, the amount of adhesion agent added will be reduced and the adhesion property will be improved. As the amount of the compound increases, the adhesion property also improves, and the effect does not change even if it is added in excess of 10% by weight.
Since this often causes problems in welding workability, the lower limit of the addition range in the present invention is 0.5% by weight, and 10% by weight.
is set as the upper limit. In addition, problems with welding workability when the weight exceeds 100% include problems such as the melting point of the slag being too high, deteriorating the compatibility between the base metal and the weld metal, increasing the number of slits, and roughening of the arc. A problem was observed.

なお、本発明において微粒酸化アルミニウムの製造法、
被覆剤中の他の成分、酸化アルミニウムを被覆剤中に配
合する方法(混合法)、被覆剤を金属心線に被覆する方
法、金属心線の径や長さ、被覆アーク溶接棒の用途など
はいりさい本発明を制限するものではな−6 (実施例) 実施例により本発明の作用効果を説明する。
In addition, in the present invention, a method for producing fine aluminum oxide,
Other components in the coating material, the method of blending aluminum oxide into the coating material (mixing method), the method of coating the metal core wire with the coating material, the diameter and length of the metal core wire, the use of the coated arc welding rod, etc. This is not intended to limit the present invention.-6 (Example) The effects of the present invention will be explained with reference to Examples.

第2表に示す粒度構成を有する酸化アルミニウム(A−
E)5種を用意した。そして第3表に示す配合のもとに
被覆剤19種類(A−1−A−4゜B−INB −8、
C−1−C−7)を作成し、これら被覆剤を5分間乾式
混合した。さらに前記混合物に水ガラスを添加し、3分
間湿式混合し、405gmφ×450−および6.0−
x700■!の炭素鋼心線(JISG 35231種1
号)に所定塗装圧で塗装を行ない被覆アーク溶接棒を作
興し、最高温度450℃で熱風乾燥を行ない、夫々の溶
接棒を用いて溶着金属の拡散性水素量の測定、溶接作業
性試験、耐ビット性試験、被覆の固着性試験を下記の方
法で試験した。
Aluminum oxide (A-
E) Five types were prepared. Based on the formulation shown in Table 3, 19 types of coating materials (A-1-A-4°B-INB-8,
C-1-C-7) were prepared and these coatings were dry mixed for 5 minutes. Further, water glass was added to the mixture, wet mixed for 3 minutes, and 405gmφ×450- and 6.0-
x700■! carbon steel core wire (JISG 35231 class 1
Coated arc welding rods were prepared by coating with a specified coating pressure, drying with hot air at a maximum temperature of 450°C, measuring the amount of diffusible hydrogen in the weld metal using each welding rod, welding workability tests, A bit resistance test and a coating adhesion test were conducted using the following methods.

〔拡散性水素量〕・・・JIEjZ・3113供試棒 
:4.0ffil+φX450sd溶接電流: A、C
,175A 溶接法 ;手溶接 溶接f囲気: 20’C,65%R,H。
[Diffusible hydrogen amount]...JIEjZ・3113 test rod
:4.0ffil+φX450sd Welding current: A, C
, 175A Welding method; Manual welding Welding f Surroundings: 20'C, 65% R, H.

〔溶接作業性および耐ピ、ト性試験〕[Welding workability and puncture resistance test]

供試棒 : 6. Om1sX700 mal溶接電流
: A、C280A 溶接法 :グラビティー溶接 運棒比 :1.2 試験板 : 16wX100+mX100oWa、5M
50A表面に20μのウォッシュプライマー塗布 または黒皮のまま。
Test rod: 6. Om 1s
Apply 20μ wash primer to 50A surface or leave black peel.

溶接姿勢:水平すみ肉 〔被覆の固着性試験〕・・・(回転脱落試験)供試棒 
: 4.Owmφx450m1.24本試験条件: 6
0mX300mX450mの鋼製容器に供試棒を挿入し
3分間容器を回転させ (35回転/ min )その後、溶接棒全量の被覆剤
重量に対するはく離し た被覆剤重量の割合を計測。
Welding position: horizontal fillet [coating adhesion test]... (rotating drop test) sample rod
: 4. Owmφx450m1.24 Test conditions: 6
The test rod was inserted into a steel container measuring 0 m x 300 m x 450 m, and the container was rotated for 3 minutes (35 rotations/min).Then, the ratio of the weight of the peeled coating to the weight of the coating of the entire welding rod was measured.

これらの試験結果を第4表に示す。なお第3表において
0印は良好、Δ印はやや不良、x印は不良を示す。特に
拡散性水素量の欄において「−」印は溶接作業性試験に
おいて致命的な欠陥があり試験を省略したものを示して
いる。さらに回転脱落試験において脱落率201以下を
良好とした。
The results of these tests are shown in Table 4. In Table 3, the mark 0 indicates good, the mark Δ indicates slightly poor, and the mark x indicates poor. In particular, in the column for the amount of diffusible hydrogen, the "-" mark indicates a welding workability test that had a fatal defect and the test was omitted. Furthermore, in the rotational shedding test, a shedding rate of 201 or less was considered good.

また第1表中の酸化アルミニウムA、Bは本発明例であ
りC,Dは本発明の範囲外(、f干粗目)例であり、E
は従来例である。
In addition, aluminum oxide A and B in Table 1 are examples of the present invention, C and D are examples outside the scope of the present invention (, f dry coarse grain), and E
is a conventional example.

この試験の結果、A−1−A−4は市販されている低水
素系被覆アーク溶接棒の代表例で、溶接作業性が良好な
もの(A−11A −2)は継手性能が悪く、継手性能
を改善したもの(A−3,A−4)は溶接作業性が悪い
。さらに高温焼成のため回転脱落率も悪い。
As a result of this test, A-1-A-4 is a typical example of a commercially available low-hydrogen coated arc welding rod, and the one with good welding workability (A-11A-2) has poor joint performance. Those with improved performance (A-3, A-4) have poor welding workability. Furthermore, due to the high temperature firing, the rotational shedding rate is also poor.

B−1〜B−8はいずれも本発明の要件を充足する実施
例で、水ガラスの量が従来より約v3程度になったにも
かかわらず塗装性は良好で、溶接作業性、被覆の固着性
、耐ビット性共に良好で拡散性水素量も少なく極めて優
れている。
B-1 to B-8 are all examples that satisfy the requirements of the present invention, and although the amount of water glass is about v3 compared to the conventional example, the paintability is good, and the welding workability and coating quality are good. It has excellent adhesion and bit resistance, and has a small amount of diffusible hydrogen.

C−1は粒径5μm以下を95チ以上含有する酸化アル
ミニウムが不足するため、水ガラスの添加量が減少せず
、固着性も良化していない。
Since C-1 lacks aluminum oxide containing 95 or more particles with a particle size of 5 μm or less, the amount of water glass added did not decrease and the adhesion did not improve.

C−2、C−3は粒径5μm以下を95%以上含有する
酸化アルミニウムが多過ぎるため、スノfツタが多くア
ーク状態が不安定になって溶接作業性が劣化した。
In C-2 and C-3, since there was too much aluminum oxide containing 95% or more of grains with a particle size of 5 μm or less, there was a lot of snot and the arc state became unstable and welding workability deteriorated.

C−4〜C−7は酸化アルミニウムの粒径5μm以上の
ものが5%を超えて粗目側に寄っているため水プラスの
添加量が減少せず被覆の固着性が改善されない。さらに
C−4,C−5は耐ピツト性が悪(C−6、C−7は溶
液中被覆筒が欠は易くなる。
In C-4 to C-7, the amount of aluminum oxide particles with a particle size of 5 μm or more exceeds 5% and is on the coarse side, so the amount of water plus added does not decrease and the adhesion of the coating is not improved. Furthermore, C-4 and C-5 have poor pit resistance (C-6 and C-7 tend to lose their coating tubes in solution).

〔発明の効果〕〔Effect of the invention〕

本発明は以上の如くの構成でなされるもので被覆剤に対
して固着剤添加量の減少効果、耐熱性効果により溶接時
の被覆一時欠けの防止など被覆の固着性の改善や良好な
溶接作業性を維持しつつ低水素若しくは極低水素溶着金
属を与えることに成功したもので、水素ぜい化や溶接欠
陥(ビットの発生)のない溶着部を与えるという効果が
得られ被覆アーク溶接棒として極めて利用価値が高いも
のである。
The present invention is constructed as described above, and has the effect of reducing the amount of adhesive added to the coating material and the heat resistance effect, which improves the adhesion of the coating, such as preventing temporary chipping of the coating during welding, and improves welding work. This product has succeeded in providing a low-hydrogen or extremely low-hydrogen weld metal while maintaining its properties, and has the effect of providing a welded part without hydrogen embrittlement or welding defects (bit generation), and can be used as a coated arc welding rod. It has extremely high utility value.

手続補正書(自発) 昭和60年7月2日Procedural amendment (voluntary) July 2, 1985

Claims (1)

【特許請求の範囲】[Claims] 粒径5μm以下を95%以上含有する酸化アルミニウム
を被覆剤中に重量パーセントで0.5〜10%添加して
なることを特徴とする低水素系被覆アーク溶接棒。
A low hydrogen-based coated arc welding rod, characterized in that 0.5 to 10% by weight of aluminum oxide containing 95% or more of particles with a particle size of 5 μm or less is added to the coating material.
JP5755685A 1985-03-23 1985-03-23 Low-hydrogen type coated electrode Pending JPS61216890A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP5755685A JPS61216890A (en) 1985-03-23 1985-03-23 Low-hydrogen type coated electrode

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP5755685A JPS61216890A (en) 1985-03-23 1985-03-23 Low-hydrogen type coated electrode

Publications (1)

Publication Number Publication Date
JPS61216890A true JPS61216890A (en) 1986-09-26

Family

ID=13059084

Family Applications (1)

Application Number Title Priority Date Filing Date
JP5755685A Pending JPS61216890A (en) 1985-03-23 1985-03-23 Low-hydrogen type coated electrode

Country Status (1)

Country Link
JP (1) JPS61216890A (en)

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