JP2009090339A - Non-plated steel wire for gas-shielded arc welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a non-plated steel wire for gas-shielded arc welding which exhibits excellent wire feedability in welding ranging from a short time to a long time and causes less tip wear even when employing a long liner especially having many bent parts, and which achieves welding with stable arc. <P>SOLUTION: The non-plated steel wire for gas-shielded arc welding is characterized in that, on its surface, a feed lubricant is stuck in an amount of 0.5-3.0g per 10 kg of wire, wherein the feed lubricant is composed of: 15-60 mass% one kind or more of sulfide oil and fats, ester sulfide, sulfide fatty acid, or sulfide olefin each having 5-20 mass% sulfur content in the base oil of one kind or more of fats and oils or ester; 8-30 mass% molybdenum disulfide; 5-15 mass% one kind or more oil soluble high molecular compounds; and other inevitable impurities. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an unplated steel wire for gas shielded arc welding in which the surface of the wire is not subjected to copper plating, and is excellent in wire feedability, particularly when welding using a soft and long conduit cable, The present invention relates to a non-plated steel wire for gas shielded arc welding such as flux-cored wire and solid wire for full-automatic and semi-automatic welding with little chip wear.

  Generally, the steel wire for gas shielded arc welding has a small diameter (0.8 to 1.6 mm) and the surface of the wire is plated with copper. This means that if the surface of the wire is not plated with copper, it will receive feed resistance due to friction resistance in the liner contained in the conduit cable during welding, and the tip will also wear due to friction, making the arc unstable. Because it becomes.

  However, when using a wire with copper plating on the wire surface, the copper plating on the wire surface is peeled off by friction in the liner during welding, and if scraped for a long time, copper scraps accumulate in the liner. As a result, there is a problem that the feeding resistance increases, the wire feeding performance becomes poor, and the arc becomes unstable. On the other hand, for wires that have not been subjected to copper plating on the surface of the wire, the conventional copper plating has the problem of peeling, and the advantages that the process can be greatly omitted at the time of wire production and the handling of plating waste liquid is unnecessary. Since then, various researches have been put into practical use.

  For example, in Japanese Patent Application Laid-Open No. 53-6247 (Patent Document 1), a rust-preventing lubricating oil to which an organic metal containing phosphorus and sulfur is added is applied to the wire surface, so that wire feedability, electrical conductivity, rust prevention, etc. An unplated steel wire that achieves the following performances is disclosed. Japanese Patent Application Laid-Open No. 55-141395 (Patent Document 2) discloses a non-plated steel in which a mixture of powdered sulfur, molybdenum disulfide, and graphite is applied to the wire surface to obtain welding performance, current-carrying characteristics, and rust prevention performance. A wire is disclosed.

Japanese Patent Laid-Open No. 11-147195 (Patent Document 3) discloses that a hydrocarbon compound having an annular structure is present on the surface of a wire to suppress peeling of a lubricating material and obtain good wire feedability. None steel wire is disclosed. Further, JP-A-2005-169415 (Patent Document 4) 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 the outer periphery thereof, and the spatter generation amount is suppressed and the wire feedability is excellent.

  However, in order to perform stable welding using the welding wire for gas shielded arc welding, the wire for gas shielded arc welding is supplied to the welded portion at a predetermined fixed speed, that is, the wire feedability is good. It is necessary to be. 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.

Uncoated steel wire with lubricant applied to the wire surface described above is easy to drop off from the wire surface due to contact with the liner, especially at the liner inlet side. 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 on the liner surface 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.
JP-A-53-6247 JP-A-55-141395 Japanese Patent Laid-Open No. 11-147195 JP 2005-169415 A

  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 an unplated steel wire for gas shielded arc welding.

The gist of the present invention is that
(1) One or more of sulfurized oil, sulfurized ester, sulfurized fatty acid or sulfurized olefin having a sulfur content of 5 to 20% by mass in one or more base oils of oil or fat or ester on the surface of the steel wire without plating for gas shielded arc welding 15 to 65% by mass, 8 to 30% by mass of molybdenum disulfide, 5 to 15% by mass of one or more oil-soluble polymer compounds, and a supply lubricant composed of other unavoidable impurities is added to an amount of 0.000 per 10 kg of wire. An unplated steel wire for gas shielded arc welding, characterized in that 5 to 3.0 g are adhered.

(2) The gas shielded arc according to (1) above, wherein the sulfurized fat, sulfurized ester, sulfurized fatty acid or sulfurized olefin has an active sulfur content at 150 ° C. of 4% by mass or less measured based on ASTM D1662. Steel wire without plating for welding.
(3) The gas shielding arc welding plating as described in (1) or (2) above, wherein the feed lubricant contains 1 to 10% by mass of one or more of phosphate ester, alkylphosphonic acid derivative or lecithin. No steel wire.
(4) The non-plated steel for gas shielded arc welding according to any one of (1) to (3), wherein the feed lubricant contains a potassium compound in a K-converted value of 0.5 to 5% by mass. On the wire.

  According to the non-plated steel wire for gas shielded arc welding of the present invention, even when welding is used when a long liner is used and there are many bent portions, the power supply tip is stably energized, and the tip wear is small. Even in welding from a short time to a long time, it is possible to perform welding with good wire feedability and stable arc.

In order to solve the above-mentioned problems, the present inventors have made various studies on a feed lubricant applied to the surface of a non-plated steel wire for gas shield arc welding. As a result, the surface of the non-plated steel wire has a sulfurized fat, sulfurized ester, sulfurized fatty acid or sulfurized olefin, molybdenum disulfide, and an oil-soluble polymer compound containing an appropriate amount of sulfur in one or more base oils of the fat or ester. By applying a feed lubricant containing an appropriate amount of the above, regardless of the length and bending of the liner, there is less wear of the tip even during welding from short time to long time, and good wire feedability and arc It was found that stable welding was possible. Further, it has also been found that when the lubricant contains one or more of a phosphate ester, an alkylphosphonic acid derivative or lecithin, a better wire feeding property can be exhibited. Furthermore, by including an appropriate amount of a potassium compound, the arc is stabilized particularly in the case of a solid wire without plating.
Hereinafter, the contents of the present invention will be described in detail.

  By adding one or more of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins having a sulfur content of 5 to 20% by mass to one or more base oils of fats and fats or esters, these sulfur components are added to the wire surface. A chemical film is formed by chemical adsorption. The chemically adsorbed lubricating film is formed by chemical bonding with the wire surface, and has stronger bonding force than physical adsorption with animal and vegetable oils and mineral oils formed by van der Waals force, especially when welding for a long time. The higher the temperature of the liner, the stronger the bonding force and the lower the coefficient of friction between the wire surface and the liner and the better the wire feedability.

  When the sulfur content of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins is less than 5% by mass, the adsorbing force of the feed lubricant to the wire surface is weak and the effect of suppressing the increase in feed resistance is not observed, and the wire feed Improve payability. Further, in long-time welding, the tip is worn and the arc becomes unstable. On the other hand, if the amount exceeds 20% by mass, the iron substrate on the wire surface reacts with sulfur to generate iron sulfide, discoloring the wire surface and causing poor electrical conductivity at the tip portion, resulting in an unstable arc. In addition, sulfur in the weld metal yields and degrades hot cracking and impact toughness.

  In addition, when the content of one or more base oils of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins is less than 15% by mass, the friction coefficient between the liner and the wire is increased, and the feeding resistance is increased. As a result, the wire feedability becomes poor. Further, in long-time welding, the tip is worn and the arc becomes unstable. On the other hand, if it exceeds 60% by mass, the iron substrate on the wire surface reacts with sulfur to produce iron sulfide, discoloring the wire surface, and the electric conductivity at the tip portion becomes poor, making the arc unstable. Further, in long-time welding, the feed lubricant is deposited in the liner, and the wire feedability becomes poor.

  The active sulfur content of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins reacts with the iron base on the wire surface to produce iron sulfide. Therefore, if the active sulfur content at 150 ° C. measured based on ASTM D1662 is more than 4% by mass, the iron substrate on the wire surface reacts with sulfur to produce iron sulfide, and the wire surface is discolored. As a result, the arc becomes unstable.

  Molybdenum disulfide has a very low frictional resistance with the liner and good wire feedability. Molybdenum disulfide that has dropped off little by little by contact with the liner is deposited in the liner by welding for a long time, but the deposited molybdenum disulfide further reduces the frictional resistance between the liner and the wire. Furthermore, even if welding is performed for a long time by reducing the frictional resistance with the tip, the wear of the tip is extremely small. Therefore, even when welding for a long time, the wire feedability is good and stable welding is possible. When the molybdenum disulfide is less than 8% by mass, the wire feedability becomes poor particularly when welding for a long time. Further, the tip is worn and the arc becomes unstable. On the other hand, when molybdenum disulfide exceeds 30% by mass, the wire slips at the wire feed roller portion, making it difficult to feed the wire.

  One or more of the oil-soluble polymer compounds have an action of uniformly dispersing the molybdenum disulfide on the wire surface and firmly attaching the molybdenum disulfide to the wire surface, thereby preventing the molybdenum disulfide from falling into the liner. Examples of the oil-soluble polymer compound include polymer compounds having an average molecular weight of 600 to 500,000 such as polybutene, polyisobutylene, polyacrylic acid ester, polymethacrylate, polyacrylic acid, maleated polybutene, polyethylene, and polypropylene.

  If one or more of the oil-soluble polymer compounds is less than 5% by mass, molybdenum disulfide cannot be uniformly dispersed, and the wire feed resistance partially increases or the wire slips at the feed roller portion. Further, in long-time welding, the feed lubricant is deposited in the liner, and the wire feedability becomes poor. On the other hand, if one or more of the oil-soluble polymer compounds exceeds 15% by mass, the electrical conductivity at the tip portion becomes poor and the arc becomes unstable.

  The feed lubricant adhesion amount on the wire surface is 0.5 to 3.0 g (hereinafter referred to as g / 10 kgW) per 10 kg of the wire. When the amount of the feed lubricant adhering to the wire surface is less than 0.5 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. Also, the tip is worn and the arc becomes unstable. On the other hand, if it exceeds 3.0 g / 10 kgW, the feed roller slips due to excessive adhesion, making it difficult to stably feed the wire. 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.

  Furthermore, at least one of phosphoric acid ester, alkylphosphonic acid derivative or lecithin is uniformly dispersed on the wire surface by uniformly dispersing each lubricating component, and also improves the conductivity of the lubricant. When one or more of phosphoric acid ester, alkylphosphonic acid derivative or lecithin is less than 1% by mass, each lubricating component is easily segregated on the wire surface, and a portion where the wire feeding property is not stable is generated. On the other hand, if it exceeds 10% by mass, the amount of spatter generated increases and welding workability deteriorates.

  Moreover, the arc is stabilized especially in the case of a solid wire without plating by containing 0.5 to 5 mass% of a potassium compound in terms of potassium in the feed lubricant. If the potassium conversion value of the potassium compound is less than 0.5% by mass, the effect cannot be exhibited, and if it exceeds 5% by mass, the amount of spatter generated increases. As the potassium compound, potassium chloride, potassium stearate, potassium nitrate, potassium sulfate, potassium fluoride, potassium bromide, potassium citrate, potassium carbonate and the like can be used.

  The base oil used in the present invention is an oil and an ester. Here, fats and oils include beef tallow, lard, palm oil, coconut oil, rapeseed oil, soybean oil, and the like. The ester is an ester synthesized from a fatty acid and an alcohol, the fatty acid is a monobasic acid or dibasic acid having 12 to 36 carbon atoms, and the alcohol is a monohydric or polyhydric alcohol having 1 to 18 carbon atoms. It is done. Specific examples include ethylhexyl palmitate, butyl oleate, butyl carbitol isostearate, lauryl behenate, neopentyl glycol oleate, trimethylolpropane isostearate, pentaerythritol oleate, trimethylolpropane dimer. It refers to acid esters and the like. One or more base oils of the fat or ester form a lubricating film by physical adsorption with the wire surface and improve rust resistance.

The viscosity of the feed lubricant on the wire surface is a factor that affects the wire feedability. When the viscosity is low, molybdenum disulfide is particularly easily peeled off from the wire surface due to contact with the liner, and the feeding resistance increases. On the contrary, if the viscosity is high, the feed lubricant on the wire surface is not uniformly applied, and the feed resistance is partially increased. Therefore, the viscosity of the feed lubricant is preferably 300 to 1400 mm ² / s.

  As shown in FIGS. 1 (a) and 1 (b), a steel wire without plating, which is the subject of the present invention, is filled with a flux 2 in a steel outer shell 1 and has a seam type flux containing a seam 3 The wire, the seamless type flux-cored wire and the solid wire of the cross-sectional structure shown in FIG.

Hereinafter, the effect of the present invention will be described in detail with reference to examples.
Seam type (Fig. 1 (a)) and seamless type (Fig. 1 (c)) non-plated flux-cored wire (JIS Z 3313 YFW-C50DR) and unplated solid wire (Table 1) Various feed lubricants were applied to JIS Z 3312 YGW12) to form a spool winding wire. The base oil esters shown in Table 2 were used. Moreover, what was shown in Table 3 was used for 1 or more types of sulfurized fats and oils, sulfurized ester, sulfurized fatty acid, or sulfurized olefin. Moreover, the adhesion amount of the feed lubricant on each prototype wire was measured by a hot toluene extraction method.

各試作ワイヤを１５０℃の恒温炉に６０日間保管して、ワイヤ表面状態を観察した後ワイヤ送給性および溶接後のライナ内への潤滑剤、他の堆積量を調べた。

Each prototype wire was stored in a constant temperature oven at 150 ° C. for 60 days, and after observing the wire surface condition, the wire feedability, the lubricant in the liner after welding, and other deposition amounts were examined.

  The wire feedability evaluation test was performed using the apparatus shown in FIG. In FIG. 2, the spool winding wire 5 set in the feeder 4 is pulled out by the feeding roller 6 and fed to the torch at the tip of the spool winding wire 5 through the liner included in the conduit cable 7. Then, bead-on-plate welding is performed between the power feed tip and the steel plate 10. The conduit cable 7 has a length of 6 m, and in order to give a feeding resistance to the wire, the bend of the conduit cable at the torch is S-shaped.

  Moreover, the bending part 9 which formed two 150 mm diameter loops was provided. The feeder is provided with a detector for the peripheral speed Vr (= set wire speed) of the feed roller, and an actual wire speed (Vw) detector 11. The slip ratio SL of the feedability evaluation index is expressed by SL = (Vr−Vw) / Vr × 100%. Further, the reaction force that the wire receives from the liner during feeding by the load cell 12 provided in the feeding roller portion was detected as the feeding resistance R.

  In the short-time welding test, welding resistance was measured for 2 minutes under the welding conditions shown in Table 4, the feed resistance R and the slip rate SL were measured, and the average value was obtained. When the feeding resistance R was 4 kgf or less and the slip ratio SL was 2% or less, it was determined that the feeding property was good. Further, the maximum values of the feed resistance R and the slip rate SL that are instantaneously increased due to poor energization and the like were measured, and the feed resistance R: 5 kgf or less and the slip rate SL: 3% or less were determined to be good feedability.

長時間溶接試験は、表４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。

In the long-time welding test, welding was repeated 10 times under the welding conditions shown in Table 4 for 10 minutes, and the welding was repeated 100 times for a total of 100 minutes. It was. In each welding time, when the feed resistance R was 5 kgf or less and the slip ratio SL was 3% or less, it was determined that the feedability was good.

Also, the amount of deposit in the liner after 100 minutes of welding was investigated. As for the amount of deposition, the liner was cut at intervals of 50 cm, and the weight of all the deposits was measured by a hot toluene extraction method. A deposition amount of 50 mg or less per 100 cm of liner length was judged good.
The stability of the arc was evaluated by observing the arc state. The spatter generation state was evaluated as “small circles” and “small particles” or “large particles” and “x”. Further, the wear amount of the tip was measured by using a new commercially available tip (inner diameter 1.4 mm) for each test, and measuring the inner diameter of the portion with the largest wear amount after the end of the long-term 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 5.

表１および表５中、ワイヤＮo.１〜８が本発明例、ワイヤＮo.９〜１８は比較例である。

In Tables 1 and 5, wires No. 1 to 8 are examples of the present invention, and wires No. 9 to 18 are comparative examples.

  Wire Nos. 1 and 2, which are examples of the present invention, are one of sulfurized fats, sulfurized esters, sulfurized fatty acids or sulfurized olefins having an appropriate amount of sulfur and low active sulfur content in the oil or ester base oil on the surface of the solid wire without plating. Feed lubrication containing an appropriate amount of at least one species, molybdenum disulfide, and one or more oil-soluble polymer compounds, and further including at least one type of phosphate ester, alkylphosphonic acid derivative or lecithin, and K equivalent value of potassium compound Since an appropriate amount of the agent is applied, there is no discoloration of the wire surface, both in the short-time welding test and long-time welding test, the feeding resistance R and the slip ratio SL are low, the arc is stable, the amount of deposit in the liner and the chip wear are also small The results were extremely satisfactory.

  In addition, since the wire No. 3 did not contain K in the lubricant on the surface of the solid wire without plating, the arc was somewhat unstable. The wires No. 4 to 7 are one or more kinds of sulfurized fats, sulfides, sulfurized fatty acids or sulfurized olefins having an appropriate amount of sulfur and low active sulfur content in the oil or ester base oil on the surface of the flux-cored wire without plating. Since an appropriate amount of a supply lubricant containing at least one of molybdenum sulfide and one or more oil-soluble polymer compounds and further including at least one of phosphate ester, alkylphosphonic acid derivative or lecithin is applied, There was no discoloration, and both the short-time welding test and the long-time welding test were very satisfactory because the feed resistance R and slip rate SL were low, the arc was stable, the amount of deposit in the liner and the chip wear were small.

  Since wire No. 8 does not contain one or more of phosphate ester, alkylphosphonic acid derivative or lecithin in the feed lubricant, feed resistance R is slightly in both short-time welding test and long-time welding test. It became high. In the comparative example, wire No. 9 has a high sulfur content of sulfurized oil and fat and sulfurized olefin in the feed lubricant, so the surface of the wire is discolored, the electrical conductivity at the tip is poor, and the arc is somewhat unstable. And the maximum values of the feeding resistance R and the slip ratio SL were increased.

  Since wire No. 10 had a low sulfur content of the sulfide ester in the feed lubricant, the feed resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test. Further, the amount of wear of the tip was large, and the arc was very unstable in the long-time welding test. Furthermore, since the total amount of phosphate ester, alkylphosphonic acid derivative and lecithin was large, the amount of spatter generated was also increased.

  Since the wire No. 11 has a large amount of sulfide ester in the feed lubricant, the wire surface was discolored, and in a short-time welding test, the electrical conductivity at the tip portion was poor and the arc was somewhat unstable. Further, in the long-time welding test, the amount of deposition in the liner increased, the feed resistance R was high, and the arc was unstable. Furthermore, since there is little phosphate ester, the maximum value of the feeding resistance R became high in the short-time welding test.

  The wire No. 12 had a small total amount of sulfurized fatty acid and sulfurized ester in the feed lubricant, so that the feed resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test. Further, the amount of wear of the tip was large, and the arc was very unstable in the long-time welding test. Since the wire No. 13 has a large amount of molybdenum disulfide in the feed lubricant, the slip ratio SL is high in both the short-time welding test and the long-time welding test, and the active sulfur content of sulfurized fatty acid and sulfide ester is large. As a result, the wire surface was discolored and the electrical conductivity at the tip portion was poor, and the arc was very unstable.

  Since the wire No. 14 has a small amount of molybdenum disulfide in the feed lubricant, the feed resistance R was high in the long-time welding test, and the arc was extremely unstable due to wear of the tip. Since the wire No. 15 has a large total amount of polybutene and polymethacrylate in the feed lubricant, the electrical conductivity at the tip portion becomes poor and the arc becomes unstable. Further, since the K-converted value of the potassium compound is large, the amount of spatter generated was large.

  Since the wire No. 16 contained less polybutene in the feed lubricant, the arc was somewhat unstable in the short-time welding test and the maximum values of the feed resistance R and the slip ratio SL were increased. Further, in the long-time welding test, the amount of deposit in the liner was large and the feed resistance R was high, and the arc was unstable. Since the wire No. 17 has a large amount of lubricating oil supplied on the wire surface, the slip rate SL was high and the arc was unstable in both the short-time welding test and the long-time welding test. Further, in the long-time welding test, the amount of deposit in the liner was large and the feed resistance R was also high.

  Since wire No. 18 has a small amount of feed lubricating oil on the wire surface, the feed resistance R is high and the arc is unstable in both the short-time welding test and the long-time welding test, and the tip wears in the long-term welding test. Furthermore, since the K-converted value of the potassium compound was small, the arc was very unstable.

It is the schematic diagram which showed the cross-sectional structure example of the flux cored wire. It is drawing which shows the apparatus of the wire feeding property evaluation test in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel outer skin 2 Flux 3 Joint 4 Feeder 5 Spool winding wire 6 Feed roller 7 Conduit cable 8 Torch 9 Conduit cable bending part 10 Steel plate 11 Wire actual speed detector 12 Load cell


Patent Applicant Nippon Steel & Sumikin Welding Co., Ltd. and 1 other

Claims (4)

Non-plated steel wire for gas shielded arc welding 15 to 1 or more kinds of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins having a sulfur content of 5 to 20% by mass in one or more base oils of fats or esters The feed lubricant containing 60% by mass, 8-30% by mass of molybdenum disulfide, 5-15% by mass of one or more oil-soluble polymer compounds, and other inevitable impurities is 0.5-3 per 10 kg of wire. An unplated steel wire for gas shielded arc welding, characterized in that 0.0 g is adhered. 2. The gas shielded arc welding-free plating according to claim 1, wherein the sulfurized fat, sulfurized ester, sulfurized fatty acid or sulfurized olefin has an active sulfur content at 150 ° C. measured based on ASTM D1662 of 4% by mass or less. Steel wire. 3. The steel wire without plating for gas shielded arc welding according to claim 1, wherein the feed lubricant contains 1 to 10% by mass of at least one of a phosphate ester, an alkylphosphonic acid derivative or lecithin. . The non-plated steel wire for gas shielded arc welding according to any one of claims 1 to 3, wherein the supply lubricant contains 0.5 to 5 mass% of a potassium compound in terms of K.

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