JP3445061B2 - Steel wire for gas shielded arc welding - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel wire for gas shielded arc welding, and more particularly to a wire which is welded using a soft and long conduit cable. The present invention relates to a gas shielded arc welding steel wire having excellent feedability. [0002] Steel wires for gas shielded arc welding (hereinafter referred to as wires) have a wire diameter of 0.8 to 2.0 m.
There are two types of wires, solid wire and flux-cored wire, with a small diameter of m. Among them, the flux-cored wire is a seamless flux-cored wire and strip steel that can be manufactured by plating or wet drawing without a seam. There is a flux-cored wire with seams that is filled with flux, wrapped and manufactured by dry drawing. [0003] Among these wires, solid wires and seamless flux-cored wires have no seam,
Copper plating can be applied to the tip attached to the tip of the welding torch, which is advantageous for the electrical conductivity and the rust resistance of the wire. It is suitable for welding with robots because it has little meandering bead, and is used favorably. [0004] These wires tend to be used more and more as the automation and efficiency of welding are advanced. However, recently, in order to further increase the efficiency, regardless of automatic or semi-automatic welding, a higher current density is required. Welding conditions are in the direction of adoption, which inevitably increases the wire feed speed. Also, depending on the target structure, welding is often performed in narrow areas, and from the point of ease of use in those places, the conduit cable from the wire feeder of the welding machine to the welding torch is bent and used. To make it easier, it tends to be soft and long. As described above, when the wire feeding speed is increased and a long and bendable conduit cable is used, frictional resistance is increased when the wire passes through a conduit tube in the conduit cable during wire feeding. As a result, there is a problem in that wire feeding during welding is hindered, and the arc becomes unstable, making welding impossible. In order to solve the problem of feedability of these wires, a method of applying an oil-based lubricant to the surface of a wire as typified by Japanese Patent Publication No. 50-3256, for example, is disclosed in JP-A-58-18.
Japanese Patent No. 4095 discloses a wire in which a mixture of a solid lubricant such as graphite, molybdenum disulfide, and glass powder is applied to the surface of the wire. However, even in these wires, the above-mentioned soft and long conduit cable is bent and used, and under severe conditions such as welding under high current welding conditions, the feeding roller of the wire feeding device is used. In such a case, the wire slips or the frictional resistance in the conduit tube increases, which hinders the feeding of the wire during welding and makes the arc unstable. Further, as shown in FIG. 1, the lubricant on the surface of the wire 3 comes into contact with the spiral metal wire 1 and peels off in the conduit tube 2 formed by spirally winding the metal wire 1 as shown in FIG. When the welding is performed, the lubricant 4 is accumulated between the spiral metal wires 1 and the contact area between the wire and the inner surface of the conduit tube 2 increases, so that the frictional resistance increases and the wire feeding resistance increases. In some cases, the lubricant is brought in and eventually the wire becomes clogged in the chip and cannot be welded. [0007] Therefore, the present invention is intended to solve the problem of slipping with a feed roller even when a flexible and long conduit cable is bent and used and welding is performed under high current welding conditions. It is an object of the present invention to provide a steel wire for gas shielded arc welding, which has no friction, has low frictional resistance, has good wire feedability, and does not easily peel off the lubricant on the wire surface and does not cause chip clogging. That is, the gist of the present invention is that one or two types of molybdenum disulfide and tungsten disulfide having a particle size of 15 μm or less are formed on the surface of a steel wire for gas shielded arc welding. 5 to 50% and particle size 1μ
The present invention relates to a steel wire for gas shielded arc welding, characterized in that 0.2 to 1.8 g of a lubricant containing 1 to 15% of titanium oxide of not more than m is contained per 10 kg of the wire. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A steel wire for gas shielded arc welding comprises a lubricant containing one or two of molybdenum disulfide and tungsten disulfide and titanium oxide on the surface thereof in an appropriate amount. Even when a soft and long conduit cable is bent and used and welded under high current welding conditions, the feed roller has no slip and has little frictional resistance, so that the wire feedability is improved. In addition, by limiting the particle size of molybdenum disulfide and tungsten disulfide contained in the lubricant, the frictional resistance in the conduit tube is further reduced, and the wire feedability is extremely good even in the aforementioned severe welding environment. It is.
Furthermore, by limiting the particle size of the titanium oxide, the separation of the lubricant on the wire surface is reduced, and even during long-time welding, the accumulation of the lubricant between the spiral metal wires of the conduit tube is reduced, thereby reducing the friction. Since the resistance is small, the wire feeding property is good, and since the lubricant is not brought into the inner wall of the chip, the wire does not clog the chip. These effects can be achieved by the coexistence effect and synergistic effect of each of the above-mentioned compositions. The reasons for limiting the content and particle size of each composition are described below. First, molybdenum disulfide and disulfide are used. One or two types of tungsten sulfide are used in an amount of 5 to 50%. Molybdenum disulfide and tungsten disulfide have the effect of reducing the wire frictional resistance in the conduit tube. If one or two of molybdenum disulfide and tungsten disulfide is less than 5%, the surface of the wire is in direct contact with the surface of the conduit tube, that is, the friction coefficient is not reduced, and the frictional force is increased. Is poor. Conversely 5
If it exceeds 0%, the wire slips at the wire feeding roller portion, causing feeding unevenness and unstable arcing. Further, when the lubricant peels off in the conduit tube and is welded for a long time, the lubricant accumulates between the spiral metal wires of the conduit tube, so that the contact area between the wire surface and the inner surface of the conduit tube increases, and the friction increases. The resistance is increased and the wire feeding is further deteriorated, and the lubricant may be brought into the inner wall of the chip and the wire may be clogged in the chip. Further, when the particle diameter of molybdenum disulfide and tungsten disulfide is 15 μm or less, the friction resistance of the wire in the conduit tube is further reduced. If the particle size exceeds 15 μm, the frictional force on the wire surface becomes slightly large and the arc becomes slightly unstable. Next, the content of titanium oxide is set to 1 to 15%. Titanium oxide has good dispersibility, excellent coverage on the wire surface, excellent adsorbability and spreadability, and molybdenum disulfide and tungsten disulfide and other lubricants are uniformly and firmly adhered to the wire surface and placed in a conduit tube. In addition to preventing the lubricant from peeling off, it also prevents the wire from slipping at the feed roller section. If titanium oxide is less than 1%, molybdenum disulfide and tungsten disulfide and other lubricants aggregate,
The wire slips at the feed roller, causing uneven feeding,
The wire feedability becomes poor. Further, when the lubricant is peeled off in the conduit tube and welded for a long time, the lubricant is accumulated between the spiral metal wires of the conduit tube, so that the contact area between the wire surface and the inner surface of the conduit tube increases, and the friction increases. The resistance is increased and the wire feeding is further deteriorated, and the lubricant may be brought into the inner wall of the chip and the wire may be clogged in the chip. If the content of titanium oxide exceeds 15%, the frictional resistance in the conduit tube becomes slightly large, and the arc becomes slightly unstable. The particle size of titanium oxide is 1 μm or less. If the particle size exceeds 1 μm, the coating properties, adsorptive properties and malleability will deteriorate, and molybdenum disulfide, tungsten disulfide and other lubricants will not be able to adhere firmly to the wire surface. The agent peels off,
When welding is performed for a long time, lubricant accumulates between the spiral metal wires of the conduit tube, increasing the frictional resistance of the wire and further reducing the wire feed. Clogging may also occur. [0015] Titanium oxide has good wettability with a liquid, so that an oil-based lubricant can be uniformly retained on the surface of the wire, and the feedability can be further improved. Titanium oxide has an anatase type crystal and a rutile type crystal structure, and in the present invention, the same effect can be obtained by using any of them. The lubricant containing one or two of molybdenum disulfide and tungsten disulfide and titanium oxide needs to be 0.2 to 1.8% per 10 kg of wire. If it is less than 0.2%, the frictional resistance in the conduit tube becomes large, and the wire feeding property becomes poor. Conversely, 1.
If it exceeds 8%, the wire will slip at the wire feeding roller portion, causing uneven feeding and making the arc unstable. The lubricant containing one or two of molybdenum disulfide and tungsten disulfide and titanium oxide is basically composed of a liquid lubricant such as animal and vegetable oils and mineral oils.
Further, it may contain a solid lubricant such as graphite, ethylene tetrafluoride, calcium carbonate, and various waxes.
The steel wire for gas shielded arc welding of the present invention is JIS
S defined in Z3312, Z3315, Z3317, etc.
i-Mn-based, Si-Mn-Ti-based solid wires, JIS Z3313, Z3318, Z3319, Z
3320 shows a flux-cored wire specified in 3320 and the like. The present invention will be described in more detail with reference to the following examples. First, wire diameters of variously varied particle sizes and amounts of molybdenum disulfide, tungsten disulfide and titanium oxide on the surface of a steel wire for gas shielded arc welding.
mm YGW11 solid wire specified in JIS Z3312 and Y specified in JIS Z3313.
A prototype of a FW-C50DR seamless flux-cored wire (flux filling rate: 15%) was used as a spool wound wire. The apparatus shown in FIG. 3 was used for the investigation of the wire feeding property. That is, in order to increase the frictional force in the conduit tube and increase the wire feeding resistance, the diameter is 150 mm.
The wire 3 pulled out from the spool 6 was fed to a 6 m conduit cable 5 provided with two loops of the above by a feed motor 7 and sent to a welding torch 8, and 15 kg of wire was welded in each test. The welding conditions at that time are as shown in Table 1. [Table 1] The wire feedability was examined by measuring the armature current of the feed motor 7. In the wire feedability, when the armature current fluctuates greatly, the arc length fluctuates and the arc becomes unstable. The slip of the wire at the wire feed roller portion was determined by measuring the peripheral speed of the feed roller and the wire speed at the outlet of the feed roller, and calculating the slip ratio by the following equation. If the slip ratio of the wire exceeds 5%, the speed of the wire feed will fluctuate and the arc will become unstable due to uneven wire feed. Slip ratio = (peripheral speed of feed roller)-(wire speed at outlet of feed roller) / (peripheral speed of feed roller) x 100 In addition, use a conduit tube that is unused for each prototype wire and weld it. After completion, the loop portion of the conduit tube was cut to check the accumulation of lubricant between the spiral metal wires. Table 2 summarizes the results. [Table 2] In Table 2, Test No. Nos. 1 to 6 are steel wires for gas shielded arc welding according to the present invention. 7
To 14 are comparative examples. Test No. of the present invention example. 1-6
Since the amount and particle size of molybdenum disulfide and tungsten disulfide and titanium oxide on the wire surface and the lubricant content are appropriate, the slip rate at the wire feed roller during welding and the armature current of the feed motor And the arc was stable, and the peeling of the lubricant in the conduit tube was small. In the comparative examples, Test No. In Test No. 7, the amount of tungsten disulfide was measured. In No. 13, since the lubricant content was small, the fluctuation of the armature current of the feed motor was large and the arc was unstable. Test No. Test No. 8 has a large amount of molybdenum disulfide. In No. 10, since the amount of titanium oxide was small, the slip ratio at the wire feeding roller was increased and the arc became unstable. In addition, a large amount of lubricant separated in the conduit tube was observed. Test No. In Test No. 9, the particle size of molybdenum disulfide was large. 11 has a large amount of titanium oxide,
In each case, the fluctuation of the armature current of the feed motor became large and the arc became slightly stable. Test No. In No. 12, since the particle diameter of titanium oxide was large, the fluctuation of the armature current of the feed motor was slightly large and the arc was slightly unstable. In addition, a large amount of lubricant separated in the conduit tube was observed. Test No. In No. 14, since the amount of the lubricant was large, the slip ratio at the wire feeding roller was increased, and the arc became unstable. As described above in detail, according to the steel wire for gas shielded arc welding of the present invention, a flexible and long conduit cable is used by bending, and welding is performed under high current welding conditions. In this case, there is no slip in the feed roller, the frictional resistance is small, the wire feedability is good, and stable welding is possible. In addition, the lubricant on the wire surface is less likely to peel off, and the accumulation of lubricant in the conduit tube and less carry-on to the inner wall of the chip is low. And the frequency of replacing conduit tubes is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a state where a wire is fed through an inner surface of a conduit tube. FIG. 2 is a cross-sectional view illustrating a state in which a lubricant is separated and accumulated in a conduit tube. FIG. 3 is a diagram showing a welding device used in an embodiment of the present invention. [Description of Signs] 1 Spiral metal wire 2 Conduit tube 3 Wire 4 Accumulated lubricant 5 Conduit cable 6 Spool 7 Feed motor 8 Welding torch

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tatsuya Hado 4-2-1 Asae, Hikari-shi, Yamaguchi Nippon Steel Welding Industry Co., Ltd. Inside the Hikari Factory (56) References JP-A-9-206987 (JP, A JP-A-7-241694 (JP, A) JP-A-6-304782 (JP, A) JP-A-6-285678 (JP, A) JP-A-5-214358 (JP, A) 314375 (JP, A) JP-A-56-84195 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 35/36

Claims (1)

(57) [Claim 1] One or two types of molybdenum disulfide and tungsten disulfide having a particle size of 15 μm or less are provided on the surface of a steel wire for gas shielded arc welding at 5 to 50% and a particle size of 1 μm.
A steel wire for gas shielded arc welding, comprising 0.2 to 1.8 g of a lubricant containing 1 to 15% of the following titanium oxide per 10 kg of the wire.