JP5064932B2 - Copper plated wire for gas shielded arc welding - Google Patents

Description

  The present invention relates to a copper-plated wire for gas shielded arc welding such as a flux-cored wire and a solid wire for full-automatic and semi-automatic welding excellent in wire feedability.

  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 this 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 the liner contained in the subsequent conduit cable. A method of feeding to a power feed tip in a welding torch attached to the end of the cable is adopted. 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 copper-plated 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 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.

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.
JP-A-7-97583 JP-A-8-155671 JP 2004-34131 A JP 2003-225794 A

  The present invention is a gas shielded arc that uses a long liner and has good wire feedability and stable arc welding from short time to long time welding even when there are many bent parts. It aims at providing the copper plating wire for welding.

  The gist of the present invention is that the surface of the copper-plated wire for gas shielded arc welding is one or more base oils of fats or esters, sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfides having a sulfur content of 5 to 20% by mass. Containing 15 to 65% by mass of one or more olefins, 8 to 30% by mass of molybdenum disulfide, 5 to 15% by mass of one or more oil-soluble polymer compounds, and other unavoidable impurities It is characterized in that 0.5 to 3.0 g of lubricant is adhered per 10 kg of wire.

  In addition, sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins are characterized in that the active sulfur content at 150 ° C. measured based on ASTM D1662 is 4% by mass or less. Further, the present invention provides the copper plating wire for gas shielded arc welding, wherein the feed lubricant contains 1 to 10% by mass of one or more of phosphate ester, alkylphosphonic acid derivative or lecithin.

  According to the copper-plated 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 feeding 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.

  In order to solve the above-mentioned problems, the present inventors have conducted various studies on a feed lubricant applied to the surface of a copper plating wire for gas shielded arc welding. As a result, the wire surface is supplied with an appropriate amount of sulfurized fat, sulfurized ester, sulfurized fatty acid or sulfurized olefin, molybdenum disulfide and oil-soluble polymer compound containing an appropriate amount of sulfur in one or more base oils of fats or esters. It has been found that by applying a lubricant, 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 by including at least one of phosphoric acid ester, alkylphosphonic acid derivative or lecithin in the lubricant, a better wire feeding property can be exhibited. Hereinafter, the contents of the present invention will be described in detail.

  By incorporating one 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 into one or more base oils of fats or esters, these sulfur components are contained. Lubricating film is formed by chemical adsorption on the wire surface. 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, if it exceeds 20% by mass, copper plating on the wire surface and sulfur react to produce copper sulfide, discoloring the wire surface, and the electric conductivity at the tip portion becomes poor, making the arc unstable. In addition, sulfur in the weld metal yields and degrades hot cracking and impact toughness.

  Also, if the content of one or more of sulfur oils and fats, sulfurized esters, sulfurized fatty acids or sulfurized olefins in the base oil is less than 15% by mass, the friction coefficient between the liner and the wire will increase, and Resistance increases and wire feedability becomes poor. On the other hand, if it exceeds 60% by mass, copper plating on the wire surface and sulfur react to generate copper sulfide to discolor the wire surface, and the electrical 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 the sulfurized fat, sulfurized ester, sulfurized fatty acid or sulfurized olefin reacts with copper on the surface of the wire to produce copper sulfide. Therefore, when the active sulfur content at 150 ° C. measured based on ASTM D1662 is more than 4% by mass, the copper plating on the wire surface reacts with sulfur to produce copper sulfide, and the wire surface is discolored. As a result, the arc becomes unstable. Further, in long-time welding, the feed lubricant is deposited in the liner, and the wire feedability becomes poor.

  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. 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. 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 ester, polymethacrylate, polyacrylic acid, maleated polybutene, polyethylene, and propylene. 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 polybutene or polyacrylic acid 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. 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, one or more of phosphoric acid ester, alkylphosphonic acid derivative or lecithin can be uniformly dispersed on the wire surface by uniformly dispersing each lubricating component and improve 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 8% 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 viscosity of the feed lubricant on the wire surface is a factor that affects the wire feedability. When the viscosity is low, the molybdenum disulfide is particularly easily peeled off from the wire surface due to contact with the liner, and the feeding resistance is increased. 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.

Hereinafter, the effect of the present invention will be described in detail with reference to examples.
Various feed lubricants were applied to a copper-plated flux-cored wire (JIS Z 3313 YFW-C50DR) having a product diameter of 1.4 mm shown in Table 1 and a solid wire (JIS Z 3312 YGW11) 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 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. 1, a spool winding wire 2 set in a feeder 1 is pulled out by a feeding roller 3 and fed to a torch 5 at the tip of the spool winding wire 2 through a liner included in a conduit cable 4. Then, bead-on-plate welding is performed between the power feed tip and the steel plate 7. The conduit cable 4 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 6 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 wire actual speed (Vw) detector 8. The slip rate SL of the feedability evaluation index is expressed as SL = (Vr−Vw / Vr × 100%. Further, the reaction force that the wire receives from the liner at the time of feeding by the load cell 9 provided in the feeding roller portion. Detected as 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 5 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: 6 kgf or less and the slip ratio SL: 3% or less were determined to be satisfactory.

長時間溶接試験は、表４に示す溶接条件で図１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。また、１００分間溶接後のライナ内の堆積量を調査した。堆積量は、ライナを５０ｃｍ間隔で切断し、温トルエン抽出法により全ての堆積物の重量を測定した。堆積量がライナ長さ１００ｃｍ当たり５０ｍｇ以下を良好と判定した。それらの結果を表５にまとめて示す。

In the long-term welding test, the welding conditions shown in Table 4 were used, and the conduit cable shown in FIG. Then, 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. 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 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。本発明例であるワイヤＮo.１、２およびワイヤＮo.４〜８は、ワイヤ表面の油脂またはエステルの基油に硫黄含有量が適量で活性硫黄分の少ない硫化油脂、硫化エステル、硫化脂肪酸または硫化オレフィンの１種または２種以上、二硫化モリブデン、ポリブテンまたはポリメタアクリレートの油溶性高分子化合物の１種以上を適量含有し、さらにリン酸エステル、アルキルホスホン酸誘導体またはレシチンの１種または２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、ワイヤ表面の変色がなく短時間溶接試験および長時間溶接試験とも送給抵抗Ｒおよびスリップ率ＳＬが低くアークが安定し、ライナ内の堆積量も少ないなど極めて満足な結果であった。

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, 2 and Nos. 4-8, which are examples of the present invention, are sulfurized fats, sulfurized esters, sulfurized fatty acids, or fatty acids or ester base oils on the surface of the wire having a suitable sulfur content and low active sulfur content. 1 type or 2 types or more of sulfurized olefins, 1 type or more of oil-soluble polymer compounds of molybdenum disulfide, polybutene or polymethacrylate, and further 1 type or 2 of phosphate ester, alkylphosphonic acid derivative or lecithin Since an appropriate amount of feed lubricant containing an appropriate amount of seeds or more is applied, there is no discoloration of the wire surface, and both the short-time welding test and long-time welding test have low feed resistance R and slip ratio SL, and the arc is stable, and the liner It was a very satisfactory result such as a small amount of deposits.

  Wire No. 3 does not contain one or more of phosphoric acid ester, alkylphosphonic acid derivative or lecithin in the feed lubricant, so feed resistance in both short-time welding test and long-time welding test R was slightly higher. 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. Moreover, since the total amount of phosphate ester and lecithin was large, the amount of spatter generated was also increased. Since wire No. 11 contains a large amount of sulfide ester in the feed lubricant, the wire surface is discolored, and in a short-time welding test, the electrical conductivity at the tip part is poor, and the arc becomes somewhat unstable and the feed is The highest values of resistance R and slip ratio SL were increased. In the long-time welding test, the feeding resistance R was high and the arc was unstable. In addition, there was a lot of deposits in the liner.

  Since wire No. 12 contained less 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. Since wire No. 13 has a large amount of molybdenum disulfide in the feed lubricant, the slip rate SL was high and the arc was unstable in both the short-time welding test and the long-time welding test. In addition, since the active sulfur content of sulfurized esters and sulfurized fatty acids is large, the wire surface is discolored, and the short-time welding test results in poor electrical conductivity at the tip, making the arc somewhat unstable and feeding resistance R And the maximum value of the slip ratio SL became high. In the long-time welding test, the feeding resistance R was high and the arc was unstable.

  Since the wire No. 14 contained less molybdenum disulfide in the feed lubricant, the feed resistance R was high and the arc was unstable in the long-time welding test. Further, since the amount of phosphate ester is small, the arc becomes somewhat unstable in the short-time welding test and the maximum values of the feeding resistance R and the slip ratio SL are increased. Since the wire No. 15 has a large amount of polybutene in the feed lubricant, the electric conductivity at the tip portion becomes poor and the arc becomes unstable.

  Since the wire No. 16 has a small amount of polymethacrylate in the feed lubricant, the arc becomes somewhat unstable in the short-time welding test and the maximum values of the feed resistance R and the slip ratio SL become high. It was. In the long-time welding test, the wire feed resistance R was high, the arc was unstable, and the amount of deposit in the liner was large.

  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 feeding resistance R was high, and the amount of deposition in the liner was large. Since the wire No. 18 had a small amount of feed lubricating oil on the wire surface, the feed resistance R was high and the arc was unstable in both the short-time welding test and the long-time welding test.

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 Feeder 2 Spool winding wire 3 Feed roller 4 Conduit cable 5 Torch 6 Conduit cable bending part 7 Steel plate 8 Wire actual speed detector 9 Load cell


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

Claims (3)

  One or more kinds of sulfurized fats and oils, sulfurized esters, sulfurized fatty acids or sulfurized olefins with a sulfur content of 5 to 20% by mass on one or more base oils of fats or esters on the surface of the copper plating wire for gas shielded arc welding 15 to 60% by mass, 8 to 30% by mass of molybdenum disulfide, 5 to 15% by mass of one or more oil-soluble polymer compounds, and 0.5 to 10% of supply lubricant consisting of other inevitable impurities A copper-plated wire for gas shielded arc welding, characterized in that ~ 3.0 g is adhered.   2. The copper plating for gas shielded arc welding according to claim 1, wherein the sulfurized fat / oil, 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. Wire.   3. The copper for gas shielded arc welding according to claim 1, wherein the feed lubricant contains 1 to 10% by mass of one or more of a phosphate ester, an alkylphosphonic acid derivative or lecithin. Plated wire.

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