JP5068483B2 - 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, and in particular, when wire is welded for a long time using a soft and long conduit cable, the wire feedability is good and the wear of the tip is small. The present invention relates to an arc-stable copper-plated wire for gas shielded arc welding.

  The gas shielded arc welding wire includes a solid wire and a flux-cored wire, and can be welded in all positions to obtain a highly reliable welded joint. Therefore, it is widely used in the manufacture of sheet steel structures for transportation equipment such as large structures mainly composed of shipbuilding, construction and bridges, and automobiles.

  The arc welding operation using the wire for gas shielded arc welding is performed continuously from the spirally formed conduit tube contained in the conduit cable and the tip of the welding torch connected thereto by the feeding roller of the wire supply device. It is used by the method of arc melting in the atmosphere of shielding gas while feeding out. In addition, the conduit cable is made of a long and soft material of 6 m or longer in order to facilitate the welding work, and is adjusted up and down or left and right to adjust the distance from the wire supply device to the welded part and to weld the narrow part. It is often used after being bent into a loop or wound in a loop to adjust its length.

  When used in such a situation, the surface of the wire in the spiral conduit tube and the contact friction part increase, the feeding resistance increases, the feeding resistance increases, and it is difficult to feed the wire smoothly. Become. Therefore, for example, in Japanese Patent Application Laid-Open No. 5-23731 (Patent Document 1), the wire surface is dry-drawn with a solid lubricant containing an appropriate amount of polytetrafluoroethylene, molybdenum disulfide, graphite, mica, sericite and talc. A flux-cored wire to which an appropriate amount of the lubricant is attached is disclosed.

  Japanese Unexamined Patent Publication No. 2000-317679 (Patent Document 2) discloses a technique in which an insulating inorganic powder and / or a conductive inorganic powder is adhered together with a water-soluble polymer. When these wires are used for welding, the wire feedability is excellent in short-term welding and the arc is stable, but when welding for a long time, these wires are not plated with copper on the wire surface. The tip is consumed due to friction with the wire and the arc becomes unstable, and solid lubricant and metal powder of the scraped conduit tube accumulates in the conduit tube due to friction between the wire and the conduit tube, and the wire is fed. Resistance increases, wire feedability deteriorates and arc becomes unstable.

On the other hand, if the surface of the wire is plated with copper, the tip wear is reduced and the arc is stabilized. Furthermore, as a technique for improving wire feedability, for example, Japanese Patent Laid-Open No. 2-2847892 (Patent Document 3) discloses a gas shielded arc welding wire in which potash soap, soda soap, and oil lubricant are applied to the wire surface. I have a suggestion. Japanese Patent Laid-Open No. 2003-225794 (Patent Document 4) applies a solid lubricant composed of MoS ₂ , BN, wax, K compound and copper powder to the lower layer portion of the wire surface, and a lubricating oil to the upper layer portion of the wire surface. There is a proposal for a wire for gas shielded arc welding.

However, when welding for a long time using the above-mentioned copper-plated wire, the friction between the wire and the conduit tube causes the lubricant on the surface of the wire and the copper or iron powder adhering during wire production to accumulate in the conduit tube, resulting in feeding resistance. Becomes very large, the arc becomes unstable, and eventually the problem of arc breakage occurs, which is not satisfactory.
JP-A-5-23731 JP 2000-317679 A Japanese Patent Laid-Open No. 2-284922 JP 2003-225794 A

  The present invention relates to a copper-plated wire for gas shielded arc welding which has good wire feedability and less wear on the tip and stable arc even when welding is performed for a long time using a soft and long conduit cable. The purpose is to provide.

The gist of the present invention is that, in a copper-plated wire for gas shielded arc welding, 0.3 to 1.5 g of lubricating oil which is liquid at room temperature per 10 kg of wire , 0.005 to 0.25 g of molybdenum disulfide, phosphorus, A gas shielded arc welding copper having 0.008 to 0.10 g of lipid, an adhesion amount of metal powder of 0.25 g or less, and an adhesion amount of solids other than metal powder is 0.10 g or less. Located on plated wire.

  According to the copper-plated wire for gas shielded arc welding of the present invention, even when welding for a long time using a soft and long conduit cable, the wire feedability is good and the wear amount of the tip is small. Arc stable welding is possible.

  In order to solve the above-mentioned problems, the present inventors have made various studies on the welding wire surface state and the feed lubricant applied to the wire surface. As a result, copper plating is applied to the surface of the wire, and an appropriate amount of lubricating oil that is liquid at room temperature is applied to the cleaned wire surface, so that even when welding with a long, long, soft cable, the wire is fed. The present inventors have found that a stable arc can be obtained with good feedability and extremely little chip wear. Furthermore, it has also been found that wire feedability is improved by having molybdenum disulfide and phospholipid together with the lubricating oil on the wire surface.

Copper plating on the wire surface improves the electrical conductivity at the tip of the chip and stabilizes the arc. Further, even when welding for a long time, the tip wear is extremely small and a stable arc is maintained and the effect of improving rust prevention is also obtained. The copper plating thickness is preferably about 0.3 to 1.2 μm.
Next, the lubricant applied to the wire surface is 0.3 to 1.5 g (hereinafter referred to as g / 10 kgW) of lubricating oil that is liquid at room temperature per 10 kg of wire.

  Lubricating oil that is liquid at room temperature has a film on the surface of the wire, and improves wire feedability during wire feed. When the lubricating oil is less than 0.3 g / 10 kgW, the feeding resistance increases in the conduit tube, and the wire feeding property becomes poor. On the other hand, if it exceeds 1.5 g / 10 kgW, the wire slips at the feeding roller portion and the arc becomes unstable.

  The lubricating oil may be animal or vegetable oil, mineral oil or synthetic oil. 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.

  As described above, copper plating on the wire surface has the effect of improving the electrical conductivity at the tip of the tip, reducing the tip wear, and improving the rust prevention. However, copper plating on the wire surface is performed with the wire diameter (about 2.5 to 3.5 mm) and then reduced to the product diameter by finish drawing, but in this process the copper plating is peeled off and the wire surface A large amount adheres. At the same time, the iron on the surface of the wire is also scraped off and adheres to the wire surface. When these metal powders adhering to the wire surface are accumulated in the conduit tube and welded for a long time, the feeding resistance becomes very large, the arc becomes unstable, and finally an arc breakage occurs. However, if the adhesion amount of the metal powder on the surface of the wire is 0.25 g / 10 kgW or less, the accumulation amount in the conduit tube is small and the feeding resistance is not increased even if welding is performed for a long time.

  In addition to metal powder such as copper powder and iron powder, residual solid wire lubricant or dirt in the wet wire lubricant adheres to the wire surface and accumulates in the conduit tube and welds for a long time. If so, the feeding resistance increases and the arc becomes unstable. However, if the amount of solids other than metal powder (hereinafter referred to as solid impurities) is 0.10 g / 10 kgW or less, the amount accumulated in the conduit tube decreases, and the conduit tube is worn out and replaced. Does not increase the feeding resistance.

  Furthermore, by having molybdenum disulfide on the wire surface, the feeding resistance is suppressed in the conduit tube to further improve the wire feeding property. When the molybdenum disulfide is less than 0.005 g / 10 kgW, the feeding resistance increases in the conduit tube, and the wire feeding property becomes poor. Conversely, when molybdenum disulfide exceeds 0.25 g / 10 kgW, the arc becomes unstable and the amount of spatter generated increases.

  When molybdenum disulfide is welded for a long time by contact with the conduit tube, a small amount of molybdenum disulfide accumulates in the conduit tube. This accumulated molybdenum disulfide serves to reduce the feeding resistance. Moreover, it is preferable that the particle size of molybdenum disulfide is 1.0 μm or less because the feeding resistance is reduced and the wire feeding property is improved.

  Moreover, by having a phospholipid on the wire surface, it has the effect | action which coexists with the lubricating oil which is liquid at normal temperature, and disperse | distributes molybdenum disulfide on the wire surface uniformly. When the phospholipid is less than 0.008 g / 10 kgW, molybdenum disulfide on the wire surface does not adhere uniformly, and there is a portion where the feeding resistance increases in the conduit tube, resulting in poor wire feeding performance. Conversely, when the phospholipid exceeds 0.10 g / 10 kgW, the amount of spatter generated increases.

  The phospholipid referred to in the present invention is a powder containing about 95% of a phospholipid such as lecithin (phosphatidylcon), phosphatidylethanolamine, phosphazinynititol, about 65% phospholipid and There are pastes containing about 35% vegetable oil such as soybean oil, and any of them can be used. Among them, lecithin obtained from soybean oil is preferable.

  In the method for producing a copper-plated wire for gas shielded arc welding according to the present invention, the wire surface of a seamless flux-cored wire or solid wire is plated, and then finish-drawn to the product diameter, It is cleaned or mechanically purified, and lubricating oil or lubricating oil that is liquid at room temperature and molybdenum disulfide and phospholipid are applied to the surface of the wire to form a spool or pail-packed wire.

Hereinafter, the effect of the present invention will be described in detail with reference to examples.
Seamless flux-cored wire (JIS Z3313 YFW-C50DR, flux filling rate 13%) and solid wire (JIS Z3312 YGW12) obtained by applying copper plating with a wire diameter of 1.2 mm shown in Table 1 to the surface of a 0.5 to 1 μm thick wire The wire surface was made into a spool winding wire by changing the degree of purification and the amount of lubricant applied. The particle diameter of molybdenum disulfide was 0.6 μm or less.

  The slip ratio SL of the wire feedability evaluation index is represented by SL = (Vr−Vw) / Vr × 100. Further, the reaction force that the wire receives from the conduit tube during wire feeding by the load cell 10 provided in the feeding roller portion was detected as the feeding resistance R. Welding is performed using a new conduit tube for each prototype wire under the welding conditions shown in Table 2 for 120 minutes, measuring the slip rate SL and the feeding resistance R for 20 minutes from the start of welding to the end of welding for 100 minutes, and calculating the average value. Asked. When the slip rate SL was 10% or less and the feed resistance R was 6 kgf or less, it was determined that the wire feedability was good. Further, the wear amount of the tip was measured by using a new tip (inner diameter: 1.4 mm) for each prototype wire and measuring the inner diameter of the portion with the greatest wear after welding. The chip wear amount was evaluated as good when the wear amount was 0.15 mm or less.

スパッタ発生量は、上記ワイヤ送給性およびチップ摩耗性の試験終了後、コンジットチューブおよびチップを交換せずに銅製の捕集箱を用いて、ビードオンプレート溶接により表２に示す溶接条件で５回溶接（１回の溶接時間１．５ｍｉｎ）して捕集したスパッタを１分間の発生量に換算した。スパッタ発生量は１ｇ／ｍｉｎ以下でアークが安定して作業性が良好である。また、スパッタ発生量測定後、コンジットチューブのループ部を切断して、潤滑剤、金属粉および固形不純物の蓄積状態を観察した。それらの結果を表３にまとめて示す。

The spatter generation amount was 5 under the welding conditions shown in Table 2 by bead-on-plate welding using a copper collection box without replacing the conduit tube and the tip after the wire feeding property and tip wear test were completed. Spatter collected by round welding (one welding time of 1.5 min) was converted to a generated amount per minute. The amount of spatter generated is 1 g / min or less, the arc is stable, and the workability is good. Further, after measuring the amount of spatter generated, the loop portion of the conduit tube was cut to observe the accumulation state of the lubricant, metal powder and solid impurities. The results are summarized in Table 3.

表１および表３中、ワイヤＮｏ．１〜５が本発明例、ワイヤＮｏ．６〜１１は比較例で
ある。本発明例ではワイヤＮｏ．１〜５は、銅めっきを有し、ワイヤ表面の潤滑剤である潤滑油量が適正で、金属粉量および固形不純物が少ないのでスリップ率ＳＬおよび送給抵抗Ｒが低くワイヤ送給性が良好で、チップ摩耗量およびスパッタ発生量も少なく溶接作業性が良好で、コンジットチューブ内への蓄積量が少ないなど極めて満足な結果であった。

In Table 1 and Table 3, the wire No. 1 to 5 are examples of the present invention, wire Nos. 6 to 11 are comparative examples. In the example of the present invention, the wire No. 1 to 5 have copper plating, the amount of lubricating oil that is a lubricant on the wire surface is appropriate, and the amount of metal powder and solid impurities is small, so the slip rate SL and the feeding resistance R are low and the wire feeding property is good The results were extremely satisfactory, such as a small amount of chip wear and spatter generation, good workability in welding, and a small accumulation amount in the conduit tube.

In the comparative example, the wire No. In No. 6 , since the copper surface was not plated with copper, the tip was worn and the arc became unstable. Further, since the amount of molybdenum disulfide was small, the feeding resistance R was high.
Wire No. In No. 7 , since the amount of lubricating oil was small, the feeding resistance R was large and the wire feeding property was deteriorated. In addition, since there was a large amount of molybdenum disulfide, the amount of spatter was large and the arc became unstable.

Wire No. In No. 8 , since the total amount of copper powder and iron powder was large, the feeding resistance R was high and the arc became unstable. In addition, since the amount of phospholipid was large, the amount of spatter was also increased.
Wire No. In No. 9 , since the amount of lubricating oil was large, the slip rate SL was high and the arc became unstable. Further, since the amount of phospholipid was small, the feeding resistance R was also high.
Wire No. In No. 10 , since the amount of solid impurities was large, the feeding resistance R was high and the arc became unstable.
Wire No. No. 11 had a large total amount of copper powder and iron powder, so the feeding resistance R was high and the arc became unstable.

It is a figure which shows the apparatus of the wire feeding property 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 Tip 7 Steel plate 8 Bending part of conduit cable 9 Wire actual speed detector 10 Load cell


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

Claims (1)

In copper-plated wire for gas shielded arc welding, 0.3 to 1.5 g of liquid lubricating oil at normal temperature per 10 kg of wire , 0.005 to 0.25 g of molybdenum disulfide, 0.008 to phospholipid on the wire surface A copper-plated wire for gas shielded arc welding, having 0.10 g , an adhesion amount of metal powder of 0.25 g or less, and an adhesion amount of solids other than metal powder is 0.10 g or less.

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