JP5172746B2 - Flux-cored wire for gas shielded arc welding - Google Patents
Flux-cored wire for gas shielded arc welding Download PDFInfo
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- JP5172746B2 JP5172746B2 JP2009048820A JP2009048820A JP5172746B2 JP 5172746 B2 JP5172746 B2 JP 5172746B2 JP 2009048820 A JP2009048820 A JP 2009048820A JP 2009048820 A JP2009048820 A JP 2009048820A JP 5172746 B2 JP5172746 B2 JP 5172746B2
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Description
本発明は、ワイヤ送給性およびアーク安定性に優れた全自動および半自動溶接用のガスシールドアーク溶接用フラックス入りワイヤに関する。 The present invention relates to a flux-cored wire for gas shielded arc welding for fully automatic and semi-automatic welding excellent in wire feedability and arc stability.
一般にフラックス入りワイヤを用いたガスシールドアーク溶接には、細径（０．８〜１．６ｍｍ）のガスシールドアーク溶接用フラックス入りワイヤが使用される。ガスシールドアーク溶接用フラックス入りワイヤはスプールに巻かれた、あるいはペールパックに装填された形態で溶接に供せられる。このガスシールドアーク溶接用フラックス入りワイヤの使用に際しては、ワイヤ送給機の送給ローラによりスプールあるいはペールパックからワイヤを引き出すとともに後続するコンジットケーブルに内包されたコンジットライナ（以下、ライナという。）内に押し込み、このライナを経由して、コンジットケーブル先端に取り付けられた溶接トーチ内の給電チップまで送給する方式が採用されている。ワイヤはこの給電チップと被溶接材間で電圧を印加されてアーク溶接が行われる。 In general, a flux-cored wire for gas shield arc welding having a small diameter (0.8 to 1.6 mm) is used for gas shield arc welding using a flux-cored wire. The flux-cored wire for gas shielded arc welding is used for welding in a form wound on a spool or loaded in a pail pack. When the flux-cored wire for gas shielded arc welding is used, the wire is pulled out from the spool or the pail pack by the feeding roller of the wire feeder, and in the conduit liner (hereinafter referred to as liner) included in the subsequent conduit cable. In this case, a method is adopted in which the sheet is fed through the liner to the power feed tip in the welding torch attached to the end of the conduit cable. The wire is subjected to arc welding by applying a voltage between the power supply tip and the material to be welded.
ここで使用されるライナは鋼線をスパイラル状にして形成したフレキシブルなガイド管であり、その長さは通常３〜６ｍ程度であるが広域の溶接を行う場合には１０〜２０ｍの長尺なものとなり、溶接個所までの距離に合わせて選択使用される。この方式によれば、造船現場等の溶接個所が狭隘な、あるいは高低差がある場所でも、コンジットケーブル（ライナ）を沿わすことにより比較的容易に溶接が行える利点がある。 The liner used here is a flexible guide tube formed by spiraling a steel wire, and its length is usually about 3 to 6 m, but it is 10 to 20 m long when welding over a wide area. It is selected and used according to the distance to the weld. According to this method, there is an advantage that welding can be relatively easily performed along the conduit cable (liner) even in a place where the welding site is narrow or has a height difference.
ところが、使用時に次のような問題が生じることがあり、その解決を求められている。安定した溶接を行うためには、ガスシールドアーク溶接用フラックス入りワイヤを決められた一定の速度で溶接部に供給すること、つまりワイヤ送給性が良好であることが必要となる。ワイヤは送給ローラの送給力によってライナ内に押し込まれ、一方、ライナ内面からは接触摩擦による送給抵抗を受ける。このとき、ライナが直線状態に近い比較的優しい使用環境化の場合には、送給抵抗はそれほど大きくならず、ワイヤ送給性に問題は生じないが屈曲個所が多く、屈曲半径（曲率半径）が小さく、あるいはライナが長尺化した場合等の過酷な使用環境下の場合には、送給抵抗が増加し送給力とのバランスが崩れ、ワイヤ送給性が悪化する。 However, the following problems may occur at the time of use, and the solution is demanded. In order to perform stable welding, it is necessary to supply the flux-cored wire for gas shielded arc welding to the welded portion at a predetermined speed, that is, to have good wire feedability. The wire is pushed into the liner by the feeding force of the feeding roller, while receiving resistance due to contact friction from the inner surface of the liner. At this time, when the liner is used in a relatively gentle use environment close to a straight line, the feeding resistance is not so large, and there is no problem in the wire feeding property, but there are many bent portions, and the bending radius (curvature radius) In a severe use environment such as when the liner is long or the liner is lengthened, the feeding resistance increases, the balance with the feeding force is lost, and the wire feeding performance deteriorates.
ガスシールドアーク溶接用フラックス入りワイヤのワイヤ送給性を向上させる方法としては、ワイヤ表面に滑り性が良好な潤滑剤を塗布することが重要である。その潤滑剤として、特開平７−９７５８３号公報（特許文献１）および特開平８−１５５６７１号公報（特許文献２）に記載されているように炭化水素系鉱物油、動物油および植物油をワイヤ表面に塗布してワイヤ送給性を向上した技術の開示がある。しかし、これらの潤滑油を塗布したワイヤでは、長尺のライナを使用し屈曲箇所の多い場合の溶接においては送給抵抗が大きく、ワイヤ送給性が不良でアークが非常に不安定であった。 As a method of improving the wire feedability of the flux-cored wire for gas shielded arc welding, it is important to apply a lubricant having good slipperiness to the wire surface. As the lubricant, hydrocarbon mineral oil, animal oil and vegetable oil are applied to the wire surface as described in JP-A-7-97583 (Patent Document 1) and JP-A-8-155671 (Patent Document 2). There is a disclosure of a technique that improves the wire feedability by coating. However, with wires coated with these lubricants, a long liner was used and welding with many bent parts had high feeding resistance, poor wire feeding performance, and arc was very unstable. .
また、特開２００４−３４１３１号公報（特許文献３）には、植物油、動物油、鉱物油および合成油からなる群から選択された１種以上で構成される基油に、ＭｏＳ2 、ＷＳ2 、黒鉛、ＰＴＦＥの単体あるいは１種以上の混合物を主成分とする固体潤滑剤を複合させた送給潤滑剤をワイヤ長手および周方向に均一塗布したガスシールドアーク溶接用ワイヤが、特開２００３−２２５７９４号公報（特許文献４）には、ワイヤ表面下層部にＭｏＳ2 、ＢＮ、ワックス、Ｋ化合物および銅粉を有し、上層部に脂肪酸エステルおよび／または潤滑剤を有するガスシールドアーク溶接用ワイヤが開示されている。 JP-A-2004-34131 (Patent Document 3) discloses a base oil composed of one or more selected from the group consisting of vegetable oils, animal oils, mineral oils and synthetic oils to MoS 2 , WS 2 , A gas shielded arc welding wire in which a feed lubricant in which a solid lubricant composed mainly of graphite and PTFE or a mixture of at least one kind of main component is uniformly applied in the wire longitudinal and circumferential directions is disclosed in Japanese Patent Application Laid-Open No. 2003-225794. (Patent Document 4) discloses a gas shielded arc welding wire having MoS 2 , BN, wax, K compound and copper powder in the lower layer portion of the wire surface and fatty acid ester and / or lubricant in the upper layer portion. It is disclosed.
これら固体潤滑剤を含む溶接用ワイヤは、特にライナ内入口側でのライナとの接触によりワイヤ表面から脱落しやすく、長尺のライナの場合溶接トーチ近傍においてワイヤ表面の潤滑剤付着量が少なくなって送給抵抗が大きくなる。さらに脱落した固体潤滑剤、ライナとの摩擦によって削られた銅めっき粉、Ｆｅ粉およびワイヤとの摩擦によって削られたライナ表面のＺｎ粉、Ｆｅ粉などがライナ内で堆積するため、長期間溶接すると徐々にワイヤ送給性が劣化し、アークが不安定になるという問題もある。 Welding wires containing these solid lubricants easily fall off from the wire surface due to contact with the liner, particularly at the liner inlet, and in the case of a long liner, the amount of lubricant adhering to the wire surface near the welding torch is reduced. Increases the feeding resistance. In addition, solid lubricant that has fallen off, copper plating powder scraped by friction with the liner, Fe powder, liner surface scraped Zn powder, Fe powder, etc. accumulate in the liner, so long-term welding Then, there is a problem that the wire feedability gradually deteriorates and the arc becomes unstable.
一方、ワイヤ表面に銅めっきが施されていないワイヤは、上記のめっき剥離の問題とともに、ワイヤ製造時に工程を省略できること、およびめっき廃液の取扱が不要になるなどの利点から従来から種々の研究がされ実用化されている。例えば、特開平１１−１４７１９５号公報（特許文献５）には、ワイヤ表面に環状構造を有する炭化水素化合物を存在させて、潤滑物質の剥離を抑制して良好なワイヤ送給性を得るというめっきなし鋼ワイヤが開示されている。 On the other hand, for wires that are not plated with copper on the surface of the wire, various researches have been conducted from the advantages such as the above-mentioned problem of plating peeling and the fact that the process can be omitted at the time of wire production and the handling of plating waste liquid becomes unnecessary. Has been put to practical use. For example, in Japanese Patent Laid-Open No. 11-147195 (Patent Document 5), plating in which a hydrocarbon compound having a ring structure is present on the surface of a wire to prevent peeling of the lubricating material and obtain good wire feedability. None steel wire is disclosed.
さらに、特開２００５−１６９４１５号公報（特許文献６）には、高級脂肪酸、アルカリ石鹸、金属石鹸、ＭｏＳ2 、黒鉛、ＢＮ、フッ化物、タルクおよびマイカのうちの１種以上からなる固形潤滑剤皮膜と、その外周に脂肪酸エステルおよび潤滑油の１種以上の液体潤滑油を塗布し、スパッタ発生量の抑制とワイヤ送給性に優れためっきなし鋼ワイヤが開示されている。 Further, JP-A-2005-169415 (Patent Document 6) discloses a solid lubricant comprising at least one of higher fatty acids, alkali soaps, metal soaps, MoS 2 , graphite, BN, fluoride, talc and mica. A non-plated steel wire is disclosed in which one or more liquid lubricants of fatty acid ester and lubricating oil are applied to the coating and its outer periphery, and the spatter generation amount is excellent and the wire feedability is excellent.
しかし、ワイヤ表面に潤滑剤を塗布しためっきなし鋼ワイヤは、特にライナ内入口側でのライナとの接触により潤滑剤がワイヤ表面から脱落しやすく、長尺のライナの場合溶接トーチ近傍においてワイヤ表面の潤滑剤付着量が少なくなって送給抵抗が大きくなる。さらに脱落した潤滑剤、ライナとの摩擦によって削られたＦｅ粉およびワイヤとの摩擦によって削られたライナ表面のＺｎ粉、Ｆｅ粉などがライナ内で堆積するため、長期間溶接すると徐々にワイヤ送給性が劣化し、アークが不安定になる。さらに、チップも摩擦によって摩耗して、アークが不安定になるという問題が生じて満足できるものではない。 However, unplated steel wires with a lubricant applied to the wire surface are prone to drop off from the wire surface due to contact with the liner, particularly at the inlet side of the liner, and in the case of a long liner, the wire surface near the welding torch This reduces the amount of lubricant adhered and increases the feeding resistance. In addition, lubricant that has fallen off, Fe powder scraped by friction with the liner, and Zn powder and Fe powder scraped by friction with the wire accumulate in the liner. The feedability deteriorates and the arc becomes unstable. Furthermore, the tip is also unsatisfactory due to the problem of the arc becoming unstable and the arc becoming unstable.
上記ワイヤ送給性の向上は、特に半自動で全姿勢溶接において溶接作業性が優れ高能率な溶接が可能なめっき有りおよびめっきなしのフラックス入りワイヤにおいて改善を強く要求されている。
本発明は、長尺のライナを使用し、かつ屈曲箇所の多い場合においても短時間から長時間の溶接に至るまでワイヤ送給性が良好でチップ摩耗が少なく、アークが安定した溶接を行うことができるガスシールドアーク溶接用フラックス入りワイヤを提供することを目的とする。 The present invention uses a long liner and performs welding with a stable arc with a good wire feeding property from a short time to a long time welding even when there are a large number of bent parts, and with little tip wear. An object of the present invention is to provide a flux-cored wire for gas shielded arc welding.
本発明の要旨とするところは、ガスシールドアーク溶接用フラックス入りワイヤ表面長手方向に不連続な長溝をワイヤ円周方向に複数有し、該長溝内にワイヤ１０ｋｇ当り二硫化モリブデンが０．２〜２．０ｇおよび炭酸石灰がＣａ換算値で０．０５〜０．４ｇ固着されており、さらに常温で液体である潤滑油の１種以上からなる送給潤滑剤がワイヤ１０ｋｇ当たり０．１〜２．５ｇ付着していることを特徴とする。また、長溝内にワイヤ１０ｋｇ当り四弗化エチレンがＦ換算値で０．０５〜０．５ｇ固着されていることも特徴とするガスシールドアーク溶接用フラックス入りワイヤにある。 The gist of the present invention is that there are a plurality of long grooves discontinuous in the longitudinal direction of the flux-cored wire surface for gas shield arc welding in the wire circumferential direction, and 0.2 to 2.5 molybdenum disulfide per 10 kg of wire in the long grooves. 2.0-g and lime carbonate are fixed to 0.05 to 0.4 g in terms of Ca, and a feed lubricant composed of one or more lubricants that are liquid at room temperature is 0.1 to 2 per 10 kg of wire. .5 g are attached. In addition, the present invention provides a flux-cored wire for gas shielded arc welding, in which 0.05 to 0.5 g of ethylene tetrafluoride per 10 kg of wire is fixed in the long groove in terms of F.
本発明のガスシールドアーク溶接用フラックス入りワイヤによれば、長尺のライナを使用し、かつ屈曲箇所の多い場合の溶接においても給電チップでの通電が安定し、さらに短時間から長時間に至る溶接でも良好なワイヤ送給性およびアークが安定した溶接が可能となる。 According to the flux-cored wire for gas shielded arc welding of the present invention, even when welding is performed when a long liner is used and there are a large number of bent portions, the energization with the power supply tip is stable, and further, it takes a short time to a long time. Even with welding, good wire feedability and welding with stable arcs are possible.
本発明者らは、前記課題を解決するためにガスシールドアーク溶接用フラックス入りワイヤ表面状態および塗布する送給潤滑剤について種々検討した。その結果、ワイヤ表面長手方向に不連続な長溝をワイヤ円周方向に複数有する長溝内に炭酸石灰により二硫化モリブデンを固着させ、その上部に常温で液体である潤滑油からなる送給潤滑剤を塗布することにより、ライナの長さおよび屈曲に関係なく、短時間から長時間に至る溶接においても良好なワイヤ送給性およびアークが安定した溶接ができることを見出した。さらに、ワイヤ表面の長溝内に二硫化モリブデンおよび炭酸石灰とともに四弗化エチレンを固着することによって、ワイヤ送給性がさらに向上することも見出した。以下、本発明の内容を詳細に説明する。 In order to solve the above-mentioned problems, the present inventors have made various studies on the surface state of the flux-cored wire for gas shielded arc welding and the supply lubricant to be applied. As a result, molybdenum disulfide is fixed with lime carbonate in a long groove having a plurality of long grooves discontinuous in the wire surface longitudinal direction, and a feed lubricant made of lubricating oil that is liquid at room temperature is formed on the upper part. It has been found that, by applying, good wire feedability and arc-stable welding can be achieved in welding from a short time to a long time regardless of the length and bending of the liner. Furthermore, it has also been found that wire feedability is further improved by fixing ethylene tetrafluoride together with molybdenum disulfide and lime carbonate in the long groove on the surface of the wire. Hereinafter, the contents of the present invention will be described in detail.
図１は、本発明のガスシールドアーク溶接用フラックス入りワイヤ表面の模式図である。この図１に示すように、ワイヤ表面１長手方向２に不連続な長溝３をワイヤ円周方向４に複数有している。図２は、図１のＡ−Ａ断面図を模式的に示す図である。この図２に示すように、長溝３の溝内には二硫化モリブデンおよび炭酸石灰が強固に固着されているので長尺のライナを用いて長時間溶接してもワイヤ表面１がライナと接触して送給潤滑剤５の皮膜が削り取られても長溝３内に固着された二硫化モリブデンが摩擦抵抗を下げてワイヤ送給抵抗が増加することはない。また、めっきなしワイヤにおいてもチップ摩耗が極めて少なくなる。なお、図２中６はめっき層または鋼素地を示す。
FIG. 1 is a schematic view of the surface of a flux-cored wire for gas shielded arc welding according to the present invention. As shown in FIG. 1, the wire surface 1 has a plurality of discontinuous
長溝内の二硫化モリブデン固着量がワイヤ１０ｋｇ当り０．２ｇ（以下、ｇ／ワイヤ１０ｋｇＷという。）未満であると、長尺のライナを使用した場合摩擦抵抗が大きくなり、十分なワイヤ送給性改善効果が得られない。また、めっきなしワイヤの場合はチップ摩耗量が大きくなってアークが不安定となる。一方、長溝内の二硫化モリブデン固着量が２．０ｇ／１０ｋｇＷを超えると、ワイヤ送給ローラ部でワイヤがスリップしてアークが不安定になる。 If the fixed amount of molybdenum disulfide in the long groove is less than 0.2 g per 10 kg of wire (hereinafter referred to as g / wire of 10 kgW), the frictional resistance increases when a long liner is used, and sufficient wire feedability is achieved. The improvement effect cannot be obtained. Further, in the case of a wire without plating, the amount of wear of the tip becomes large and the arc becomes unstable. On the other hand, when the molybdenum disulfide adhesion amount in the long groove exceeds 2.0 g / 10 kgW, the wire slips at the wire feed roller portion, and the arc becomes unstable.
長溝内の炭酸石灰は、二硫化モリブデンを強固に長溝内に固着して、屈曲したライナとの接触においても削り取られることがないので長尺のライナを使用してもワイヤ送給性が劣ることがない。長溝内の炭酸石灰のＣａ換算値が０．０５ｇ／ワイヤ１０ｋｇ未満であると、屈曲したライナとの接触において二硫化モリブデンが削り取られて長尺のライナを使用した場合ワイヤ送給性が不良になる。また、めっきなしワイヤの場合はチップ摩耗量が大きくなってアークが不安定になる。一方、長溝内の炭酸石灰のＣａ換算値が０．４ｇ／ワイヤ１０ｋｇを超えるとスパッタ発生量が多くなる。 The lime carbonate in the long groove firmly adheres molybdenum disulfide in the long groove and is not scraped off even in contact with the bent liner, so even if a long liner is used, the wire feedability is inferior. There is no. When the Ca equivalent value of lime carbonate in the long groove is less than 0.05 g / 10 kg of wire, when a long liner is used because the molybdenum disulfide is scraped off in contact with the bent liner, the wire feedability becomes poor. Become. Further, in the case of a wire without plating, the amount of wear of the tip becomes large and the arc becomes unstable. On the other hand, when the Ca equivalent value of lime carbonate in the long groove exceeds 0.4 g / 10 kg of wire, the amount of spatter generated increases.
ワイヤ表面の常温で液体である潤滑油の１種以上からなる送給潤滑剤は、ワイヤ表面との物理吸着により潤滑膜を形成してワイヤ送給時にワイヤ送給性を向上させるとともに耐錆性を向上させる。常温で液体である潤滑油は、動植物油、鉱物油あるいは合成油の何れでもよい。 A feed lubricant consisting of one or more lubricants that are liquid at room temperature on the wire surface forms a lubricating film by physical adsorption with the wire surface to improve wire feedability during wire feeding and rust resistance To improve. The lubricating oil that is liquid at room temperature may be animal or vegetable oil, mineral oil, or synthetic oil.
動植物油としてはパーム油、菜種油、ひまし油、豚油、牛油、魚油等を、鉱物油としてはマシン油、タービン油、スピンドル油等を用いることができる。合成油としては炭化水素系、エステル系、ポリグリコール系、ポリフェノール系、シリコーン系、フロロカーボン系を用いることができる。また、前記潤滑油に硫化油脂、硫化エステル、硫化脂肪酸および硫化オレフインの１種または２種以上である硫黄含有の潤滑油を用いることもできる。 Palm oil, rapeseed oil, castor oil, pig oil, cow oil, fish oil, etc. can be used as animal and vegetable oils, and machine oil, turbine oil, spindle oil, etc. can be used as mineral oils. As the synthetic oil, hydrocarbon type, ester type, polyglycol type, polyphenol type, silicone type and fluorocarbon type can be used. In addition, sulfur-containing lubricating oils that are one or more of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids, and sulfurized olefins can also be used as the lubricating oil.
ワイヤ表面の送給潤滑剤付着量は、０．１〜２．５ｇ／１０ｋｇＷとする。ワイヤ表面の送給潤滑剤付着量が０．１ｇ／１０ｋｇＷ未満では、潤滑性能不足によりワイヤ表面とライナとの摩擦係数が増大し、送給抵抗の増加抑制効果は期待できずワイヤ送給性が不良となる。また、めっきなしワイヤの場合はチップ摩耗量が大きくなってアークが不安定になる。一方、２．５ｇ／１０ｋｇＷを超えると、過剰付着により送給ローラがスリップしてアークが不安定になる。また、長時間の溶接ではライナ内に送給潤滑剤が堆積しワイヤ送給性が不良となる。さらに、潤滑油成分は、Ｃ−Ｈ結合で構成されているため、溶接時に多量の水素が混入し、溶接金属部にピットやブローホールが生じやすくなる。 The feed lubricant adhesion amount on the wire surface is 0.1 to 2.5 g / 10 kgW. If the amount of the feed lubricant adhering to the wire surface is less than 0.1 g / 10 kgW, the friction coefficient between the wire surface and the liner increases due to insufficient lubrication performance, and the effect of suppressing the increase in feed resistance cannot be expected. It becomes defective. Further, in the case of a wire without plating, the amount of wear of the tip becomes large and the arc becomes unstable. On the other hand, if it exceeds 2.5 g / 10 kgW, the feeding roller slips due to excessive adhesion, and the arc becomes unstable. In addition, when the welding is performed for a long time, the feed lubricant is deposited in the liner and the wire feedability becomes poor. Furthermore, since the lubricating oil component is composed of C—H bonds, a large amount of hydrogen is mixed during welding, and pits and blowholes are likely to occur in the weld metal portion.
長溝内の四弗化エチレンは、二硫化モリブデンをワイヤ周方向および長手方向に均一に分散させて、ワイヤ送給性をさらに向上する。長溝内の四弗化エチレンのＦ換算値が０．０５ｇ／ワイヤ１０ｋｇ未満であると、二硫化モリブデンをワイヤ周方向および長手方向に均一に分散させることができず、部分的に摩擦抵抗が大きくなったりワイヤ送給ローラ部でスリップしてアークが不安定になる。一方、長溝内の四弗化エチレンのＦ換算値が０．５ｇ／ワイヤ１０ｋｇを超えるとスパッタ発生量が多くなる。 The ethylene tetrafluoride in the long groove disperses molybdenum disulfide uniformly in the circumferential direction and the longitudinal direction of the wire, thereby further improving the wire feedability. If the F converted value of ethylene tetrafluoride in the long groove is less than 0.05 g / 10 kg of wire, molybdenum disulfide cannot be uniformly dispersed in the circumferential direction and longitudinal direction of the wire, and the frictional resistance is partially increased. Or slips at the wire feed roller and the arc becomes unstable. On the other hand, when the F converted value of ethylene tetrafluoride in the long groove exceeds 0.5 g / 10 kg of wire, the amount of spatter generated increases.
本発明のガスシールドアーク溶接用フラックス入りワイヤの製造方法は、鋼製外皮にフラックスを充填してワイヤ表面に銅めっきを施した、または銅めっきなしのワイヤ径２〜４ｍｍの素線表面に二硫化モリブデンおよび炭酸石灰またはさらに四弗化エチレンを含む二硫化モリブデンを付着させローラダイスまたは孔ダイスで製品径まで伸線して、ワイヤ表面長手方向に不連続な長溝をワイヤ円周方向に複数設けて長溝内に二硫化モリブデンおよび炭酸石灰またはさらに四弗化エチレンを固着させる。次いで送給潤滑剤を塗布して製品とする。長溝の大きさおよび長溝内の二硫化モリブデンおよび炭酸石灰またはさらに四弗化エチレンの固着量は、二硫化モリブデンおよび炭酸石灰またはさらに四弗化エチレンの含有量、粒径、ワイヤ素線径および縮径量などを変えて調整する。 The method for producing a flux-cored wire for gas shielded arc welding according to the present invention includes a method in which a steel sheath is filled with a flux and copper is plated on the surface of the wire, or a wire having a wire diameter of 2 to 4 mm without copper plating is applied to the surface of the wire. Molybdenum sulfide and lime carbonate or molybdenum disulfide containing ethylene tetrafluoride is attached and drawn to the product diameter with a roller die or a hole die, and a plurality of discontinuous long grooves in the wire surface longitudinal direction are provided in the wire circumferential direction. Then, molybdenum disulfide and lime carbonate or further tetrafluoroethylene are fixed in the long groove. Next, a supply lubricant is applied to obtain a product. The size of the long groove and the amount of molybdenum disulfide and lime carbonate or further tetratetrafluoroethylene adhering in the long groove are the contents of molybdenum disulfide and lime carbonate or further tetratetrafluoroethylene, the particle diameter, the wire diameter and the shrinkage. Adjust by changing the diameter.
なお、二硫化モリブデンの固着量の測定は、銅めっき有りワイヤはアンモニア水に過酸化水素水を加えた溶液でワイヤ表面の銅めっきを溶解してその溶液中の二硫化モリブデンを分析し、めっきなしワイヤは塩酸水溶液でワイヤ表面を溶解してその溶液中の二硫化モリブデンを分析して求める。 For the measurement of the amount of molybdenum disulfide fixed, the wire with copper plating was analyzed by analyzing the molybdenum disulfide in the solution by dissolving the copper plating on the wire surface with a solution of aqueous hydrogen peroxide and ammonia water. No wire is obtained by dissolving the wire surface with an aqueous hydrochloric acid solution and analyzing molybdenum disulfide in the solution.
炭酸石灰のＣａ換算値の固着量の測定は、銅めっき有りワイヤはアンモニア水に過酸化水素水加えた溶液でワイヤ表面の銅めっきを溶解してその溶液中のＣａを分析し、めっきなしワイヤは塩酸水溶液でワイヤ表面を溶解してその溶液中のＣａを分析して求める。
四弗化エチレンのＦ換算値の固着量の測定は、酸素雰囲気中で５００℃で焼成し、発生したＦを水に吸収させ、Ｆ量をイオン電極法により分析する。
Measurement of the fixed amount of Ca-converted lime carbonate is as follows: For the wire with copper plating, the copper plating on the surface of the wire is dissolved in a solution of hydrogen peroxide in ammonia water and the Ca in the solution is analyzed. Is obtained by dissolving the wire surface with an aqueous hydrochloric acid solution and analyzing Ca in the solution.
Measurement of the fixed amount of tetrafluoroethylene in terms of F is performed by baking at 500 ° C. in an oxygen atmosphere, absorbing the generated F in water, and analyzing the F amount by an ion electrode method.
本発明の対象とするガスシールドアーク溶接用フラックス入りワイヤは、図３（ａ）、（ｂ）に示すように鋼製外皮７内にフラックス８を充填し、合せ目９を有する断面構造のシームタイプのめっきなしフラックス入りワイヤ、図３（ｃ）に示す断面構造のシームレスタイプのめっきなしおよび銅めっき有りのフラックス入りワイヤを対象とする。
The flux-cored wire for gas shielded arc welding that is the object of the present invention is a seam having a cross-sectional structure in which a
以下、本発明の効果を実施例により具体的に説明する。
図３の（ａ）のシームタイプ（めっきなし）と図３の（ｃ）のシームレスタイプ（めっき有りおよびめっきなし）のフラックス入りワイヤ（ＪＩＳ Ｚ ３３１３ ＹＦＷ−Ｃ５０ＤＲ）素線（３〜４ｍｍ径）に各種粒径（３０μｍ以下）の二硫化モリブデンおよび炭酸石灰または二硫化モリブデンと炭酸石灰に四弗化エチレンを混合したものをワイヤ素線に付着させて伸線してワイヤ表面長手方向に不連続な長溝を付して二硫化モリブデンおよび炭酸石灰または二硫化モリブデンと炭酸石灰に四弗化エチレンを固着したのちに各種送給潤滑剤を塗布して、表１に示すワイヤ径１．４ｍｍのスプール巻きワイヤとした。
Hereinafter, the effect of the present invention will be described in detail with reference to examples.
3 (a) seam type (without plating) and FIG. 3 (c) seamless type (with and without plating) flux-cored wire (JIS Z 3313 YFW-C50DR) strand (3-4 mm diameter) In addition, molybdenum disulfide of various particle sizes (30 μm or less) and lime carbonate or a mixture of molybdenum disulfide and lime carbonate mixed with tetrafluoroethylene are attached to the wire element and drawn to discontinuity in the longitudinal direction of the wire surface. With a long groove and molybdenum disulfide and lime carbonate or molybdenum disulfide and lime carbonate fixed with ethylene tetrafluoride and then various feed lubricants applied to the spool with a wire diameter of 1.4 mm as shown in Table 1 A wound wire was used.
ワイヤ送給性評価試験は、図４に示す装置を用いて行った。図４においてワイヤ送給機１０にセットされたスプール巻きワイヤ１１は、送給ローラ１２により引き出され、コンジットケーブル１３に内包したライナを経てその先端のトーチ１４まで送給される。そして給電チップと鋼板１６の間でビードオンプレート溶接を行う。コンジットケーブル１３は６ｍ長で、ワイヤに送給抵抗を与えるために、トーチ手元のコンジットケーブル屈曲をＳ字にした。また、１５０ｍｍ径のループを２つ形成した屈曲部１５を設けた。ワイヤ送給機１０には送給ローラの周速度Ｖｒ（＝設定ワイヤ速度）の検出器、ワイヤの実速度（Ｖｗ）検出器１７を備えている。送給性評価指標のスリップ率ＳＬはＳＬ＝（Ｖｒ−Ｖｗ）／Ｖｒ×１００％で表される。また、送給ローラ１２部に設けられたロードセル１８により送給時にワイヤがライナから受ける反力を送給抵抗Ｒとして検出した。
The wire feedability evaluation test was performed using the apparatus shown in FIG. In FIG. 4, the
溶接試験は、表２に示す溶接条件で、１０分溶接後５分休憩を１０回繰り返し合計１００分溶接し、１０分毎の送給抵抗Ｒとスリップ率ＳＬを測定し、平均値を求めた。各溶接時間で送給抵抗Ｒが５ｋｇｆ以下、スリップ率ＳＬが３％以下の場合に送給性良好と判定した。 The welding test was performed under the welding conditions shown in Table 2, and a 5-minute break after 10-minute welding was repeated 10 times for a total of 100 minutes, the feeding resistance R and the slip rate SL every 10 minutes were measured, and the average value was obtained. . When the welding resistance R was 5 kgf or less and the slip ratio SL was 3% or less at each welding time, it was determined that the feeding property was good.
アークの安定性は、アーク状態を観察して評価した。スパッタ発生状態の評価は、小粒で少ないものを○、小粒または大粒で多いものを×として評価した。また、チップの摩耗量は、試験毎に新しい市販のチップ（内径１．５ｍｍ）を用いて、溶接試験終了後最も摩耗量の多い箇所の内径を測定した。チップ摩耗量の評価は、摩耗量が０．１ｍｍ以下を良好と評価した。それらの結果を表３にまとめて示す。 The stability of the arc was evaluated by observing the arc state. The spatter generation state was evaluated as ○ with small and small particles, and x with small or large particles. Further, the wear amount of the tip was measured by using a new commercially available tip (inner diameter 1.5 mm) for each test, and measuring the inner diameter of the portion with the largest wear amount after the end of the welding test. The chip wear amount was evaluated as good when the wear amount was 0.1 mm or less. The results are summarized in Table 3.
本発明例であるワイヤＮo.１〜８は、ワイヤ表面長手方向の不連続な長溝に二硫化モリブデンおよび炭酸石灰または二硫化モリブデン、炭酸石灰および四弗化エチレンを適量固着し、常温で液体である潤滑油の１種以上を適量含む送給潤滑剤が適量塗布されているので送給抵抗Ｒおよびスリップ率ＳＬが低くアークが安定し、ライナ内の堆積量およびチップ磨耗も少ないなど極めて満足な結果であった。 Wire Nos. 1 to 8, which are examples of the present invention, are fixed at appropriate amounts of molybdenum disulfide and lime carbonate or molybdenum disulfide, lime carbonate and ethylene tetrafluoride in discontinuous long grooves in the longitudinal direction of the wire. The feed lubricant containing the proper amount of one or more lubricants is applied in an appropriate amount, so the feed resistance R and slip rate SL are low, the arc is stable, the amount of deposit in the liner and the chip wear are extremely satisfactory, etc. It was a result.
なお、ワイヤＮo.３およびＮo.５は、ワイヤ表面長手方向の不連続な長溝に四弗化エチレンを含んでいないので送給抵抗Ｒおよびスリップ率ＳＬが若干高値であった。比較例中ワイヤＮo.９は、二硫化モリブデン固着量が少ないので送給抵抗Ｒが高く、めっき無しワイヤであるのでチップ摩耗量が大きくアークが不安定であった。また、送給潤滑剤量が多いのでスリップ率ＳＬが高くアークが不安定で、ライナ内の堆積量も多かった。 The wires No. 3 and No. 5 did not contain ethylene tetrafluoride in the discontinuous long grooves in the wire surface longitudinal direction, so that the feeding resistance R and the slip rate SL were slightly high. The wire No. 9 in the comparative example had a high feed resistance R because of the small amount of molybdenum disulfide adhering, and because it was a non-plated wire, the tip wear amount was large and the arc was unstable. Further, since the amount of lubricant to be fed was large, the slip ratio SL was high, the arc was unstable, and the amount of deposit in the liner was also large.
ワイヤＮo.１０は、二硫化モリブデン固着量が多いのでスリップ率ＳＬが高くアークが不安定であった。また、四弗化エチレンのＦ換算値が多いのでスパッタ発生量が多かった。ワイヤＮo.１１は、炭酸石灰が固着されていないので送給抵抗Ｒが高くライナ内の堆積量も多かった。また、めっき無しワイヤであるのでチップ摩耗量が大きくアークが不安定であった。 Since the wire No. 10 had a large amount of molybdenum disulfide fixed, the slip rate SL was high and the arc was unstable. Moreover, since the F conversion value of tetrafluoroethylene was large, the amount of spatter generated was large. Since the wire No. 11 was not fixed with lime carbonate, the feed resistance R was high and the amount of deposit in the liner was also large. Further, since the wire was not plated, the amount of wear of the tip was large and the arc was unstable.
ワイヤＮo.１２は、ワイヤ表面に固着された炭酸石灰のＣａ換算値が多いのでスパッタ発生量が多かった。また、四弗化エチレンが固着されていないので送給抵抗Ｒおよびスリップ率ＳＬが若干高値でアークがやや不安定であった。ワイヤＮo.１３は、ワイヤ表面に固着された炭酸石灰のＣａ換算値が多いのでスパッタ発生量が多かった。また、送給潤滑剤量が少ないので送給抵抗Ｒが高く、めっき無しワイヤであるのでチップ摩耗量が大きくアークが不安定であった。 The wire No. 12 had a large amount of spatter due to a large amount of Ca equivalent of lime carbonate fixed on the wire surface. Further, since ethylene tetrafluoride was not fixed, the feeding resistance R and the slip rate SL were slightly high, and the arc was somewhat unstable. The wire No. 13 had a large amount of spatter due to a large amount of Ca equivalent of lime carbonate fixed on the wire surface. In addition, since the amount of the feed lubricant was small, the feed resistance R was high, and since the wire was not plated, the tip wear amount was large and the arc was unstable.
ワイヤＮo.１４は、二硫化モリブデン固着量が少ないので送給抵抗Ｒが高かった。ワイヤＮo.１５は、ワイヤ表面に固着された炭酸石灰のＣａ換算値が少ないので送給抵抗Ｒが高くライナ内の堆積量も多かった。また、四弗化エチレンのＦ換算値が多いのでスパッタ発生量が多かった。ワイヤＮo.１６は、送給潤滑剤量が少ないので送給抵抗Ｒが高かった。 The wire No. 14 had a high feeding resistance R because of the small amount of molybdenum disulfide adhering. The wire No. 15 had a high feeding resistance R and a large amount of deposit in the liner because the Ca equivalent value of the lime carbonate fixed to the wire surface was small. Moreover, since the F conversion value of tetrafluoroethylene was large, the amount of spatter generated was large. The wire No. 16 had a high feed resistance R because of a small amount of feed lubricant.
１ ワイヤ表面
２ ワイヤ長手方向
３ 長溝
４ ワイヤ円周方向
５ 送給潤滑剤
６ めっき層または鋼素地
７ 鋼製外皮
８ フラックス
９ 合せ目
１０ ワイヤ送給機
１１ スプール巻きワイヤ
１２ 送給ローラ
１３ コンジットケーブル
１４ トーチ
１５ コンジットケーブル屈曲部
１６ 鋼板
１７ ワイヤ実速度検出器
１８ ロードセル
特許出願人 日鐵住金溶接工業株式会社
代理人 弁理士 椎 名 彊 他１
DESCRIPTION OF SYMBOLS 1
Patent Applicant Nippon Steel & Sumikin Welding Co., Ltd.
Attorney Attorney Shiina and others 1
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