JP2009220162A - Wire for gas shielded arc welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wire for gas shielded arc welding, a wire using a long liner and capable of welding with superior wire feedability and arc stability from short time welding to long time welding even in the case of many bent places. <P>SOLUTION: The wire for gas shielded arc welding has discontinuous long grooves in the longitudinal direction on the surface and in plurality in the wire circumferential direction, is fastened by molybdenum disulfide of 0.005-0.20 g per 10 kg of the wire in the long grooves, and is also stuck therein by a feed lubricant of 0.5-3.0 g per 10 kg of the wire. The feed lubricant contains 11-80 wt.% of one or more of sulfurized greases, ester sulfide, fatty acid sulfide, or olefin sulfide in which sulfur content is 5-20 wt.% in grease or base oil having at least one ester, and containing other inevitable impurities. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wire for gas shielded arc welding for fully automatic and semi-automatic welding excellent in wire feedability and arc stability.

  Generally, for gas shielded arc welding, a welding wire having a small diameter (0.8 to 1.6 mm) is used. The wire for gas shielded arc welding is used for welding in a form wound on a spool or loaded in a pail pack. When using the wire for gas shielded arc welding, the wire is pulled out from the spool or pail pack by the feeding roller of the feeder and pushed into a conduit liner (hereinafter referred to as a liner) included in a subsequent conduit cable. A system is adopted in which the sheet is fed to the power feed tip in the welding torch attached to the end of the conduit cable via the liner. The wire is subjected to arc welding by applying a voltage between the power supply tip and the material to be welded.

  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.

  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 that the gas shielded arc welding wire is supplied to the welded portion at a predetermined speed, that is, the wire feedability is good. 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.

  As a method for improving the feedability of the 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. .

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 longitudinal direction and the circumferential direction of the wire is disclosed in JP 2003-225794 A (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.

  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.

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. 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.

  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.

The improvement of the wire feedability is strongly demanded for the flux-cored wire with and without plating, which is excellent in welding workability in semi-automatic and all-position welding and capable of highly efficient welding.
JP-A-7-97583 JP-A-8-155671 JP 2004-34131 A JP 2003-225794 A 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 a wire for gas shielded arc welding that can be used.

  The gist of the present invention is that there are a plurality of long grooves discontinuous in the longitudinal direction of the wire surface for gas shielded arc welding, and molybdenum disulfide is 0.005 to 0.20 g per 10 kg of wire in the long grooves. 11 to 80 masses of 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 in one or more base oils of fats or esters It is characterized in that 0.5 to 3.0 g of a supply lubricant composed of% and other inevitable impurities is adhered per 10 kg of the wire.

  Further, the feed lubricant contains 8 to 30% by mass of molybdenum disulfide and 5 to 15% by mass of one or more oil-soluble polymer compounds. Furthermore, the wire lubricant for gas shielded arc welding includes 1 to 10% by mass of one or more of phosphate ester, alkylphosphonic acid derivative or lecithin in the feed lubricant.

  According to the gas shielded arc welding wire of the present invention, even when a long liner is used and there are many bent portions, the current supply at the power supply tip is stable, and even when welding is performed for a short time to a long time. Good wire feedability and arc stable welding are possible.

  In order to solve the above-mentioned problems, the present inventors have made various studies on the surface state of the wire for gas shielded arc welding and the supply lubricant to be applied. As a result, molybdenum disulfide is fixed to a long groove having a plurality of long grooves discontinuous in the wire surface longitudinal direction, and a sulfurized fat or oil containing an appropriate amount of sulfur in one or more base oils of oil or ester on the upper part thereof. By applying one or more feed lubricants of sulfurized ester, sulfurized fatty acid or sulfurized olefin, good wire feedability even in welding from short time to long time, regardless of liner length and bending It was also found that arc welding can be performed stably.

  Further, by applying a supply lubricant containing an appropriate amount of one or more of a phosphoric acid ester, an alkylphosphonic acid derivative or lecithin to the supply lubricant, molybdenum disulfide and an oil-soluble polymer compound are further improved. It has also been found that wire feedability and arc stability can be exhibited. Hereinafter, the contents of the present invention will be described in detail.

  In FIG. 1, the schematic diagram of the wire surface for gas shielded arc welding of this invention is shown. The wire surface 1 has a plurality of discontinuous long grooves 3 in the longitudinal direction 2 in the wire circumferential direction 4. 2 and 3 schematically show AA cross-sectional views of FIG. Since molybdenum disulfide is fixed in the groove of the long groove 3, the wire surface 1 comes into contact with the conduit liner even if it is welded for a long time using a long liner, and the coating of the feed lubricant 5 is scraped off. However, molybdenum disulfide fixed in the long groove 3 does not lower the frictional resistance and increase the wire feeding resistance. Further, chip wear is extremely reduced even in a wire without plating. In the figure, 6 indicates a plating layer or steel substrate, and 7 indicates molybdenum disulfide as a feed lubricant.

  When the fixed amount of molybdenum disulfide in the long groove is less than 0.0005 g per 10 kg of wire (hereinafter referred to as “g / wa 10 kgW”), when a long liner is used, the frictional resistance increases 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, if the molybdenum disulfide adhesion amount in the long groove exceeds 0.20 g / 10 kgW, the wire slips at the wire feed roller portion, making it difficult to feed the wire.

  The feed lubricant on the wire surface contains one or more of sulfurized fats, 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. When applied, these sulfur components are chemically adsorbed on the wire surface to form a lubricating film. 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. On the other hand, when the amount exceeds 20% by mass, in the case of a wire with plating, copper plating and sulfur on the surface of the wire react to produce copper sulfide, discoloring the surface of the wire and causing poor electrical conductivity at the tip, resulting in an arc. It becomes unstable. In the case of a wire without plating, the iron base on the surface of the wire reacts with sulfur to generate iron sulfide, discoloring the surface of the wire, and the electric conductivity at the tip portion becomes poor, resulting in an unstable arc. In addition, sulfur in the weld metal yields and degrades hot cracking and impact toughness.

  Also, if the content of one or more sulfur oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins in the base oil is less than 15% by mass, the coefficient of friction between the liner and the wire will increase, and Resistance increases and wire feedability becomes poor. On the other hand, if it exceeds 80% by mass, in the case of a wire with plating, copper plating and sulfur on the surface of the wire react to generate copper sulfide, discoloring the surface of the wire and causing poor electrical conductivity at the tip portion, resulting in an arc failure. Become stable. In the case of a wire without plating, the iron base on the surface of the wire reacts with sulfur to generate iron sulfide, discoloring the surface of the wire, and the electric conductivity at the tip portion becomes poor, resulting in an unstable arc. Further, in long-time welding, the feed lubricant is deposited in the liner, and the wire feedability becomes poor.

  The feed lubricant adhesion amount on the wire surface is 0.5 to 3.0 g / 10 kgW. 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. 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.

  In addition, molybdenum disulfide contained in the feed lubricant reduces the frictional resistance with the liner and improves the 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. Therefore, even when welding for a long time, the wire feedability is good and stable welding is possible. When the molybdenum disulfide in the feed lubricant is less than 8% by mass, the wire feedability becomes poor particularly when welding for a long time. 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 of the feed lubricant can evenly disperse the molybdenum disulfide on the wire surface and firmly adhere the molybdenum disulfide to the wire surface, preventing it from falling into the liner. To do. 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 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.

  In addition, one or more of phosphate esters, alkylphosphonic acid derivatives or lecithins of the feed lubricant are uniformly dispersed on the wire surface by uniformly dispersing each lubricant component, and the conductivity of the lubricant is improved. Improve. 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.

  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 oil or fat or ester form a lubricating film by physical adsorption with the wire surface.

  The method for producing a wire for gas shielded arc welding according to the present invention includes molybdenum disulfide or molybdenum disulfide containing a carrier material on the surface of a wire having a wire diameter of 2 to 4 mm with or without copper plating. Is attached to the product diameter with a roller die or a hole die, and a plurality of long grooves discontinuous in the wire surface longitudinal direction are provided in the wire circumferential direction to fix molybdenum disulfide in the long groove. Next, a supply lubricant is applied to obtain a product. The size of the long groove and the fixed amount of molybdenum disulfide in the long groove are adjusted by changing the wire diameter, the particle diameter of the molybdenum disulfide and the amount of diameter reduction.

  The amount of molybdenum disulfide fixed was measured after the wire surface was washed with toluene or hexane, and the copper-plated wire was prepared by dissolving copper plating on the wire surface with a solution of ammonia water and persulfate aqueous solution. Molybdenum disulfide in the solution is analyzed, and the wire without plating is obtained by dissolving the wire surface with an aqueous hydrochloric acid solution and analyzing the molybdenum disulfide in the solution.

  As shown in FIGS. 4A and 4B, the gas shielded arc welding wire of the present invention is a seam type having a cross-sectional structure in which a flux 9 is filled in a steel outer shell 8 and a seam 10 is provided. The target is a flux-cored wire without plating, a seamless-type flux-cored wire with a cross-sectional structure shown in FIG. 4C, and a copper-plated flux-cored wire and a solid wire without plating and copper plating.

Hereinafter, the effect of the present invention will be described in detail with reference to examples.
4 (a) seam type (without plating) and seamless type (with and without plating) flux-cored wire (JIS Z 3313 YFW-C50DR) and solid wire (JIS Z 3312 YGW12) in FIG. ) A copper wire with or without copper plating (3 to 4 mm diameter) and various particles (30 μm or less) of molybdenum disulfide alone or a mixture of molybdenum disulfide and an inorganic compound carrier material are attached to the wire. After drawing and attaching discontinuous long grooves in the longitudinal direction of the wire and fixing molybdenum disulfide, various supply lubricants were applied to form a spool winding wire having a wire diameter of 1.4 mm shown in Table 1 . The base oil ester of the feed lubricant was the one shown in Table 2. Moreover, what was shown in Table 3 was used for 1 type, or 2 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. 5, the spool winding wire 12 set in the feeder 11 is pulled out by the feeding roller 13 and fed to the torch 15 at the tip of the spool winding wire 12 through the liner included in the conduit cable 14. Then, bead-on-plate welding is performed between the power feed tip and the steel plate 17. The conduit cable 14 has a length of 6 m, and in order to give a feeding resistance to the wire, the conduit cable at the torch is bent into an S shape. Moreover, the bending part 16 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 a detector 18 for the actual speed (Vw) of the wire. 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 19 provided in the feeding roller portion was detected as a feeding resistance R.

  In the short-time feedability test, welding resistance was measured for 2 minutes under the welding conditions shown in Table 4, the feed resistance R and the slip ratio 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 instantaneous feeding resistance R and slip ratio SL due to the energization failure were measured, and the feeding resistance R: 5 kgf or less and the slip ratio SL: 3% or less were determined to be good feeding characteristics.

長時間溶接試験は、表４に示す溶接条件で図５に示すコンジットケーブルの手元Ｓ字屈曲と１５０ｍｍ径のループ１つの屈曲条件として、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 long-time welding test was conducted under the welding conditions shown in Table 4 with the S-curve of the conduit cable shown in FIG. 5 and a bending condition of one loop of 150 mm diameter. Then, the feeding resistance R and the slip ratio SL every 10 minutes were measured, and the average value was obtained. 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.

  In addition, the amount of deposition 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 as good. 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 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．１〜１０が本発明例、ワイヤＮｏ．１１〜２０は比較例である。

In Table 1 and Table 5, the wire No. 1 to 10 are examples of the present invention, wire Nos. 11 to 20 are comparative examples.

  Wire No. which is an example of the present invention. 1 to 10 have an appropriate amount of molybdenum disulfide fixed in a discontinuous long groove in the longitudinal direction of the wire surface, and an appropriate amount of sulfurized fat, sulfurized ester, sulfurized fatty acid or Since an appropriate amount of a feed lubricant containing an appropriate amount of one or more sulfurized olefins is applied, there is no discoloration of the wire surface, and the feed resistance R and slip ratio SL are low in both the short-time welding test and the long-time welding test. The results were very satisfactory, such as stable arc and small amount of deposit in the liner.

  Wire No. 1, 6 and no. No. 10 does not contain at least one oil-soluble polymer compound of molybdenum disulfide, polybutene or polymethacrylate in the feed lubricant, and also contains at least one of phosphate ester, alkylphosphonic acid derivative or lecithin Since it was not included, the feeding resistance R and the slip ratio SL were slightly higher in both the short-time welding test and the long-time welding test, but the wire feeding property was good. In addition, Test No. 3 and no. In No. 7, since the feed lubricant does not contain one or more of phosphate ester, alkylphosphonic acid derivative or lecithin, the feed resistance R is slightly increased in both the short-time welding test and the long-time welding test. However, the wire feeding property was good.

  In the comparative example, the wire No. No. 11 had no discontinuous long grooves in the longitudinal direction of the wire surface and molybdenum disulfide was not fixed, so that the feeding resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test. Further, in a long-time welding test, the amount of wear of the tip was large, the arc was very unstable, and spatter was often generated. Test No. In No. 12, since a large amount of molybdenum disulfide was fixed in the discontinuous long grooves in the longitudinal direction of the wire surface, the slip ratio SL was high and the arc was unstable in both the short-time welding test and the long-time welding test.

  Wire No. In No. 13, since the sulfur content of the sulfide ester in the feed lubricant was small, the feed resistance R was high in both the short-time welding test and the long-time welding test. In addition, since the feed lubricant was a large amount of molybdenum disulfide, the slip rate SL was high and the arc was unstable in both the short-time welding test and the long-time welding test. Wire No. In No. 14, the sulfur content of the sulfurized oil and fat and olefin sulfide in the feed lubricant was large, so the wire surface was discolored, the electrical conductivity at the tip portion was poor, and the arc was somewhat unstable. In addition, since there was little molybdenum disulfide as the feed lubricant, the feed resistance R was high and the arc was unstable in the long-time welding test.

  Wire No. In No. 15, since the amount of fatty acid sulfide in the feed lubricant was small, the feed resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test. In addition, since the feed lubricant does not contain an oil-soluble polymer compound, the maximum slip rate SL is high in the short-term welding test, and in the long-term welding test, the amount of deposit in the liner is increased, the feed resistance R is high, and the arc is high. However, the amount of spatter was very unstable.

  Wire No. No. 16, since there are a lot of sulfurized fatty acids in the feed lubricant, the surface of the wire is discolored. Especially in the short-term welding test, the electrical conductivity at the tip part becomes poor and the maximum value of the feed resistance R is increased, resulting in an arc. Slightly unstable. Also, in the long-time welding test, the amount of deposit in the liner increased, the feed resistance R was high, and the arc was unstable. Wire No. In No. 17, since the amount of feeding lubricant on the wire surface was small, the feeding resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test. Moreover, since the total amount of the phosphate ester, alkylphosphonic acid derivative and lecithin in the feed lubricant was large, the amount of spatter generated was large.

  Wire No. In No. 18, since the amount of the lubricant supplied on the wire surface was large, the slip ratio SL was high in both the short-time welding test and the long-time welding test, and the arc was somewhat unstable in the short-term welding test. Further, in the long-term welding test, the amount of deposition in the liner increased, the feed resistance R was high, and the arc was unstable. Wire No. No. 19 has a large slip ratio SL in both the short-time welding test and the long-time welding test since molybdenum disulfide is fixed in a large number of discontinuous long grooves in the longitudinal direction of the wire surface. Since the total amount of methacrylate was large, the arc was unstable.

  Wire No. No. 20, since the sulfur content of the sulfurized fat and oil and olefin sulfur in the feed lubricant is large, the wire surface is discolored, the electrical conductivity at the tip portion is poor, and the phosphate ester, alkylphosphonic acid derivative and lecithin In the short-term welding test, the maximum values of the feeding resistance R and the slip ratio SL were high, and in the long-term welding test, both the feeding resistance R and the slip ratio SL were slightly high and the arc was unstable.

It is a schematic diagram of the wire surface for gas shielded arc welding of this invention. It is AA sectional drawing of FIG. It is AA sectional drawing of FIG. 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 test in the Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wire surface 2 Wire longitudinal direction 3 Long groove 4 Wire circumferential direction 5 Feed lubricant 6 Plating layer or steel base 7 Molybdenum disulfide of feed lubricant 8 Steel outer skin 9 Flux 10 Joint 11 Feeder 12 Spool winding Wire 13 Feed roller 14 Conduit cable 15 Torch 16 Conduit cable bent portion 17 Steel plate 18 Wire actual speed detector 19 Load cell


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

Claims (3)

There are a plurality of long grooves discontinuous in the wire circumferential direction in the longitudinal direction of the wire surface for gas shielded arc welding, and molybdenum disulfide is fixed to the long grooves in an amount of 0.005 to 0.20 g per 10 kg of the wire. 1 to 1 or more base oils containing 15 to 80% by mass of 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, and other unavoidable impurities A wire for gas shielded arc welding, wherein 0.5 to 3.0 g of feed lubricant is attached per 10 kg of wire. The wire for gas shielded arc welding according to claim 1, wherein the feed lubricant contains 8 to 30% by mass of molybdenum disulfide and 5 to 15% by mass of one or more oil-soluble polymer compounds. The wire for gas shielded arc welding according to claim 1 or 2, wherein the feed lubricant contains 1 to 10% by mass of one or more of phosphate ester, alkylphosphonic acid derivative or lecithin. .

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