TWI295606B - Non-copper-plated welding wire - Google Patents

Description

1295606 (1) Description of the Invention [Technical Field] The present invention relates to a non-coppered wire in the form of a solid wire or a powder cored wire. [Prior Art] It is customary to use fine wire (0.8 to 1.6 mm in diameter) for MAG welding (with C02 or C02 + Ar) and MIG welding. When welding, the wire is supplied from the bobbin or the drum in the following manner. Pull one end of the wire from the bobbin (or drum) with the supply roller of the feeder and push it into the liner of the pipe cable behind the supply roller. Thus, the wire passes through the liner to the tip of the torch placed at the welding site. A pipe liner is a flexible conduit formed from spirally wound copper wire. It is usually 3 to 6 m long and sometimes as long as 1 0 to 2 0 m. Choose a sufficient length based on the distance to the welding site. Even if the pipe cable is placed in a zigzag or up and down at a narrow working place, it is necessary to stably convey the wire at a constant rate regardless of the supply conditions. This feed performance is one of the important characteristics of the wire. When pushed into the liner by the feed roller, the wire faces the resistance due to friction with the inside of the liner. If the pipe liner is almost straight, the resistance is not large enough to prevent the feed. However, if the pipe cable bends or bends sharply or excessively, it will have a large resistance. This increased resistance will exceed the feed capacity, resulting in poorer feed performance. To ensure stable feed performance, it is necessary to reduce the -4- (2) 1295606 resistance from the pipe liner. A common way to reduce feed resistance and improve feed performance is to apply a lubricant (liquid or solid) to the surface of the arc wire. The following several methods have been proposed to improve the feed performance of the wire. Japanese Patent Laid-Open Publication No. Hei-08-1587-1858 discloses the application of a sufficient amount of oil to the surface of the wire. Japanese Patent Publication No. Hei-06-285678 discloses the application of a solid lubricant (e.g., Mo S2 ) to the surface of a wire. Japanese Patent Laid-Open Publication No. Sho-55-040068, Sho-56-144892, Hei-08-267284, and No. 2000-1 1 7486 disclose a method of lubricating oil held by a crack on a surface of a wire, the crack being Produced when the wire is annealed to reduce its strength before the wire is finally drawn. The disclosure of the patent publications Sho-5 8- 1 84095, Hei-08-99 1 88 and 2 0 04-00 1 06 1 discloses powder lubrication in a groove formed on the surface of the wire method. The above prior art is mainly used to reduce the feed resistance to the welding wire during welding. Further, Japanese Patent Publication No. Hei-5-069181, No. 2000-107881, and No. 2000-27 No. 780 discloses a technique of charging an arc stabilizer into a groove formed on the surface of a wire. This technique is used to improve arc stability. [Inventive content] Unfortunately, the prior art disclosed in the above patent application cannot necessarily promote the wire feeding performance and arc stability of a conventional arc welded solid wire because they do not pay attention to What happens when the wire rubs against the tip. -5- (3) 1295606 Therefore, there is a need for a new arc welding wire that can be easily welded with minimal weld slag and fumes. The inventors have found that the welding current flows from the tip to the surface of the wire, thereby partially melting the wire at its sliding contact point, causing the wire to adhere to the tip after curing. (This phenomenon is referred to as fusion bonding thereafter). Melt bonding is an important factor in determining the feed performance of a wire. In fact, the fusion bond increases the friction with the inside of the pipe liner, which greatly increases the feed resistance. If the Φ feed resistance exceeds 10 kgf, the supply roll can no longer keep up with the welding roll and slip between the roll and the wire. Since the supply rolls are often harder than the wire, sliding the surface of the wire causes the debris (metal powder) to accumulate in the pipe liner or tip. The accumulated debris prevents the wire from feeding smoothly. The present invention has been accomplished to solve the above problems. SUMMARY OF THE INVENTION One object of the present invention is to provide a non-coppered wire having the following characteristics: the ability to stabilize the melting at the sliding contact point between the tip and the surface of the wire during welding; # not suddenly solidified during continuous welding, otherwise, in sliding contact Sudden solidification at the point; excellent wire feed performance and arc stability; " good processability with minimal weld slag and fumes. < One aspect of the present invention is directed to a non-coppered wire having an average current of 150 to 170 A, a tip having a current supply length of 2 to 4 mm, and a distance between the tip and the parent material being 20 to 24 mm, And because the free loop wire caused by the bending of the welding wire has a diameter of 700 to 800 mm, the welding wire can be subjected to CO2 gas-covered arc welding, so that the current is 140 to -6 - (4) 1295606 180 A under the condition of The voltage drop between the wire and the tip exceeds 〇41 V. The rate of 槪41 V is higher than 7〇%. For every 10 kg, the wire is loaded with 〇25 ～1 ·5 g of oil on the surface. The oil is selected from vegetable oil and animal oil. At least one of mineral oil and synthetic oil. According to this aspect of the invention, the rate of voltage drop exceeding 〇·41 V is preferably greater than 80%, more preferably greater than 90%. Further, according to this aspect of the invention, it is preferable that each of the above-mentioned non-φ copper-plated welding wires of 10 kg is loaded with a lubricant of 〇1 to 0·25 g on the surface thereof or in a surface layer of a depth of 1 μm. The lubricant is at least one selected from the group consisting of M〇S2, WS2, and ZnS. The wire of this aspect of the invention is stably melted at the point of sliding contact between it and the tip during welding, without sudden solidification during continuous welding, or suddenly solidified at the sliding contact point. The wire has excellent wire feed performance and arc stability. It also has excellent weldability and minimal weld slag and fumes. [Embodiment] Embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. The present invention is based on the idea that the feed resistance of the wire is basically derived from the welding current flowing through the wire, not simply from the mechanical (frictional) force between the wire and the pipe liner. Figure 1 shows an apparatus for determining the melt adhesion force and the feed resistance. The wire 1 1 unwound from the reel 1 is supplied to the pipe liner 3 (6 m long) by the supply roller 2. The welding wire passes through the pipe liner 3 and reaches the welding torch 5. The supply roller 2 is fixed to the (5) 1295606 table 4b, and the table 4b is movable on the frame 4a in the wire feeding direction. Incidentally, the pipe liner 3 is wound once so that the wire passing therethrough is subjected to mechanical drag. One end of the pipe liner 3 (near one end of the supply roll 2) is supported by a bracket 8 which is fixed to the frame 4a. A welding power source controlled by a thyristor transistor 1 2 (commercially available) applies a welding voltage through the tip end 30 of the torch 5 and the soldering plate 6. Thus, an arc occurs between the welding wire 11 exposed from the welding torch 5 and the welding plate 6. When the welding wire 11 supplied from the supply roller 2 reaches the welding plate 6 through the pipe liner 3 and the welding torch 5, the feeding resistance is received. This feed resistance manifests itself as the force with which the wire 1 1 pushes the movable table 4b. (In other words, the force acting on the supply roller 2 and the bracket 8 or the frame 4a pushes the movable table 4b away from the supply roller 2). This force is measured by a dynamometer 9 placed between the movable table 4b and the bracket 8 or the frame 4a. The force thus measured represents the feed resistance. A second load cell 5a attached to the torch 5 measures the melt bonding force between the tip 30 and the wire 11. The load cell 5a has a hole in its center for the wire 11 to pass. The wire 11 passes through the hole to the tip 30. In this operation, a welding current is supplied from the tip 30 to the welding wire 1, and the welding current causes local fusion bonding between the welding wire 11 and the tip end 30. As a result, the wire 11 applies a downward force to the tip 30. This force was measured with a force gauge 5 a. (The force acting on the tip 30 is hereafter referred to as tip resistance). Incidentally, the dynamometer 5a is completely electrically insulated from the torch 5 because the dynamometer is easily damaged by the welding current. The welding current is supplied directly from the welding power source 1 2 to the tip 30. Also, the current supply cable of the welding power source 12 is equipped with a Hall device 1 检测 for detecting the Hall current corresponding to the welding power -8 - (6) 1295606 flow. The voltage between the welding torch 5 and the welding plate 6 is detected by the voltmeter 7 to obtain a welding voltage. The feed resistance, tip resistance, welding current, and welding voltage thus measured were input to the recorder 13 °. Fig. 2 is a graph showing the relationship between the welding current and the feed resistance measured by the above measuring instrument. Note that there is no welding current (or when the welding current is zero), and even if the welding wire 1 is supplied at a rate of 12 m/min, the feed resistance is small (less than 20 N). This feed resistance is simply due to the mechanical friction between the welding wire 11 and the pipe liner 3. On the other hand, it should be noted that after the start of welding, especially after the welding current exceeds 1 〇〇 A, the feed resistance begins to increase as the welding current increases. The symbol in Figure 2 indicates the average enthalpy of feed resistance at each welding current level. The error bars extending from the symbol indicate the upper and lower limits of the feed resistance change. As shown in Figure 2, as the welding current increases, the feed resistance increases (the change in feed resistance also increases). Therefore, it is obtained that the feed resistance is generated when the welding current flows from the wire to the tip. The greater the welding current, the greater the variation in feed resistance and feed resistance. The increase in the feed resistance is caused by the fact that when the welding current flows from the tip end of the torch 5 to the welding wire 11, the sliding contact point melts to cause fusion bonding. The inventors conducted experiments to investigate this phenomenon. It has been found that the most effective way to reduce the melt bond is to create conditions in which the slip contact is easily softened and the molten state continues to exist during welding. It has also been found that as long as the sliding contact point is stably maintained as a solid or stably maintained in a softened or molten state, the welding current flowing from the welding wire to the tip is still small, the tip resistance is still small, and the feed resistance is still It is small. -9- (7) l2956〇6 This rule is correct regardless of the type of wire or the surface condition of the wire (in the gold type). > To tens to hundreds of amps), the slip cannot remain solid when flowing through it. From a practical point of view, a soft or molten state is required instead of being repeatedly and repeatedly cured. In order to know if the sliding contact point is always in the guaranteed state, it is necessary to determine the temperature of the sliding contact point. However, direct temperature measurement is difficult, so the free electron load current and heat pass law in the metal requiring temperature indicate that there should be a certain relationship between the contact point temperature (Tmax) and the contact point, and the following mathematical surface is used. The welding current on the plating (usually the contact almost always has a moving contact point that remains soft, molten and soft or molten for use in this purpose. The voltage drop (Ec) of the sliding contact point is expressed.

Ec = {4L ( Tmax

Tert2) } 1/2 where TERT indicates tip temperature 'L indicates Lauren's V/K) 2). This relationship predicts that the contact point temperature Tmax increases with voltage. When the electrical drop (Ec) exceeds a certain 値, the 'grounding' relationship predicts 'assuming a sharp point and temperature (TE 300 K), when the voltage drop (Ec) reaches 〇 The composition of .41V^ is melted at 1 3 5 6 κ (melting point). image 3

Tert) The voltage drop (Ec) at 3 〇〇Κ, 400 Κ, 500 Κ, 600 K or 900 与 and the contact point temperature (2·45 χ 1 〇·8 (ece (E c ) increase and the contact melts. Specific RT) is equal to room temperature (, copper (as the tip indicates the tip temperature (, 700 K, 800 K: (Tmax) between -10- (8) 1295606. In Figure 3, the leftmost curve represents the tip The data observed when the temperature TERT is equal to room temperature (300 K). The curve to the right indicates the changed tip temperature of 400 K, 500 K, 600 K, 700 K, 800 K, and 900 K. The non-coppered wire has a relatively low resistance k at its surface contact. In addition, it has a large fluctuation of resistance and voltage drop (above the voltage drop (Ec) of 0.41 V causing copper melting _). The surface state of the wire controls the voltage drop. To this end, any of the following methods can be used. (1) The outer layer passage step is omitted (this step is considered to be a substantially final step in the case of using oil or fat). ) with the help of a lubricant containing one or two sodium or potassium soaps, pull into the most The water of the rear diameter is washed (at 3 (TC and above 30 °C) and subsequently dried. The resulting wire has an improved surface with uniform electrical properties. The surface of the wire is treated with hot water or high temperature and high pressure steam to provide the surface of the wire. Resistance of the average sentence. (3) Using a dry lubricant to draw the wire with a light mold or a micro-mill (micr 〇mi 11 ) in a manner that uniformly forms surface irregularities on the surface of the wire in the longitudinal direction. Irregularity increases the resistance of the wire surface. (4) The final diameter of the product is drawn, followed by a method that does not produce excessive surface oxidation but forms a very thin oxide film on the surface of the wire. Heating at a high temperature (high frequency induction heating furnace) for a sufficient period of time. The resulting wire has a uniformly increased surface resistance. -11 - (9) 1295606 (5) The sulfide is retained on the surface of the wire. In the step, the first and third steps are different from the conventional steps used in the production of the wire. According to the production equipment, the steps can be sufficiently combined to prepare the desired surface. Molten welding wire. In other words, if the surface of the wire has uniform small smooth surface irregularities, extremely thin oxide film and residual sulfide throughout its circumference and length, the welding current can always make the wire Surface softening and melting. The technique of the present invention is applicable to solid wire (without flux) and powder cored wire. Since the hole of the tip is about 40 mm long and the wire is in contact with the hole at several points, if measured by an ordinary method, The voltage drop generated during soldering is small. In other words, the voltage drop between the tip and the wire occurs parallel to these points of contact. Therefore, the voltage drop can be measured in the following manner of the present invention. The voltage drop was measured when soldered with the tip of the insulating sleeve inserted in its hole (not including the front end of about 3 to 4 mm long) as shown in Fig. 4. The insulating sleeve allows only one contact point to exist on a macroscopic view. Figure 4 (a) is a cross-sectional view of the tip. Figure 4 (b) is a cross-sectional view of the torch equipped with the tip shown in Figure 4 (a). The torch 20 is enclosed in an insulating sleeve 22 and connected to a cable 21 through which the welding wire U is supplied. At the lower end of the torch 20 is a conductive connector 23 to which the conductive connector 23 is connected. The lower side of the connector 23 has a downward projection on which the upper portion of the main body 31 of the tip end 30 is screwed. Thus, the conductive connector 23 electrically connects the power cable 24 to the body 31 of the tip 30. The downward projection is surrounded by an insulating cylinder 25 placed thereon, and the insulating cylinder 25 is surrounded by a sleeve 26 -12-(10) 1295606. A tip 30 is placed in the sleeve 26. The insulating cylinder 25 is provided with an inlet 27 for shielding gas. Thus, the sleeve 26 supplies a shielding gas through the inlet 27. The tip 30 has a hole through which the wire passes (at the center of the body 31). The inside of the hole / (not including the small portion of the front end of the tip 3 3 which is about 3 to 4 mm long) is covered with an insulating sleeve 32, for example, the measured inner diameter of the insulating sleeve 32 is 2.0 mm and the outer diameter is 3.2 mm. The insulating sleeve 3 2 prevents the welding wire 1 1 from electrically contacting the conductive body 3 1 〇 φ The leading end 3 3 of the tip 30 has a hole having a diameter slightly larger than the wire 11 but slightly smaller than the insulating sleeve 32, so that the wire 1 1 is passing It does not directly contact the conductive body 31. Thus, the welding current is directly supplied to the front end 3 3 of the tip 30, and the current cannot be supplied to the welding wire 1 1 from any other metal portion at all. The positive electrode 28 is electrically connected to the tip end 30 in the sleeve 26, and the negative electrode (not shown) is attached to the end of the wire 11 wound on the bobbin 1. The potential difference between the positive electrode 28 and the negative electrode was measured with a digital recorder (not shown). 9 Torch 20 and tip 30 can be welded with an average current of 150 to 170 A, for example, a wire having a diameter of 1.2 mm. The average current is the current observed on an ammeter connected to the welding power source. There is no electrical beta difference between the end of the welding wire 11 of the contact tip 30 and the other end of the welding wire 1 1 of the contact bobbin 1 because the potential recording circuit (or digital recorder) has a sufficiently large internal resistance. Only negligible current flows through. Therefore, measuring the potential difference between the positive electrode 28 and the negative electrode corresponds to measuring the potential difference between the welding wire 11 and the tip end 3 of the tip end 30. The wave form of the welding current is input to the digital recorder in complete synchronism with the signal of the potential difference. The detection of the welding current can be achieved by using the Hall device 1 分 or the shunt -13- (11) 1295606, which is preferred because of the good noise. For soldering with 100% co2 as a shielding gas, it is only necessary to observe the relationship between the welding current and the voltage drop. This is because the soldering under transient short-circuit conditions causes the current to fluctuate greatly between approximately 100 A and 400 A. This can measure the voltage drop due to the current up to 400 A. An example of the measurement is shown in Fig. 5.

Fig. 5 (a) is a graph showing the relationship between the welding current and the voltage drop observed in the comparative example. Fig. 5 (b) is a graph showing the relationship between the welding current and the voltage drop observed in the examples. Note that even if the average current is 160 A, the instantaneous welding current greatly changes from 20 A to 400 A because the droplets repeatedly undergo short circuiting transfer and globular transfer. In Figure 5, an instantaneous voltage drop is plotted against each current ,, and the resulting voltage drop represents the state of the contact point. Since the metallic copper melts at 0.41 V, the critical voltage drop at which the contact point is softened and melted is 0.41 V. Figures 6(a) and 6(b) show the density distribution of the voltage drop occurring in the range of 40 A as the welding current changes from 140 A to 180 A in Figures 5(a) and 5(b). (The frequency distribution occurs). Specifically, the voltage drop is measured at intervals of 2 milliseconds in synchronization with the welding current, and the measurement of all voltage drops is plotted against the current varying from 1 40 V to 180 V. The 密度 rate density distribution represents the proportion of those points where the voltage drop exceeds 0.41 V. In Fig. 6, the enthalpy ratio of the voltage drop exceeding 0.41 V is represented by the ratio of A/B, where A represents the area enclosed by the vertical line of the point of 0.4 1 V and the curve on the right side of the vertical line, and B represents the data curve. The total area enclosed. -14- (12) (12)

1295606 Figure 6 (a) shows the rate of voltage drop for a common non-coppered wire. Note that the voltage drop exceeds 〇 · 4 1 V and the defect rate is about 0 · 5. Fig. 6(b) shows the voltage drop of the welding wire of the present invention because the welding wire is repeatedly melted at the sliding contact point and the welding wire is frequently melted and melted, which is not stable. It should be noted that the voltage drop of more than 0.41 V is higher than the 0.S dynamic contact point melting, so the wire can be seen from the foregoing findings, the non-coppered wire (which produces the present non-coppered wire) is defined according to the present invention as follows . (1) When the non-coppered copper wire has a current supply length of 2 to 4 mm at an average current of 150°, a tip-to-matrix distance of 20 to 24 mm, and a bending of the wire of 700 to 800 mm. When used for CO 2 gas under the condition of diameter; (2) Under the condition of current of 1400-1180 A, the voltage drop between the terminals exceeds 0.41 V and the defect rate is higher than 70%. (3) Further, the non-copper surface of the present invention is loaded with 0.25 to 1.5 g of oil per 1 kg, and the oil is at least one selected from the group consisting of vegetable oil mineral oil and synthetic oil. The condition in the above (1) is to measure the voltage drop. According to the present invention, the welding is performed with a wide distribution of welding current, and the average enthalpy is 150 to 170 Å. The voltage drop is welded with such a welding current. For example, the average welding current of 16 0 A is used (welding density distribution. For this purpose, the operation is used. Compared to the helium density, the density is 1. Because of the effect of sliding stability, the effect is - 170 A, the tip material The free loop wire is covered by arc welding of the wire and the tip wire in the welding of its surface, animal oil, and wire. The current of the electrical machine is measured by the welding current -15- (13) 1295606 The instrument is set to 1 60 A In the welding, the actual welding current will fluctuate instantaneously between 20 A and 400 A. The voltage drop was measured for the current fluctuating between 140 A and 180 A as described later. As described in (2) above, the welding is performed with an average welding current of 150 to 170 A, and the relationship between the actual current and the voltage drop is plotted as shown in FIG. The actual current is extracted from 1 4 0 to 1 8 0 A. A voltage drop of more than 0.41 V is required, accounting for 70% of all cases. In other words, the rate of enthalpy that requires a voltage drop of more than 0.41 V should be higher than 70%. As long as this requirement is met, the feed resistance does not exceed 60 N, regardless of the welding current in the feed system of a 6 m long pipe liner cable with one ring. For the later mentioned embodiment, this is shown in Fig. 11. Therefore, the wire of the present invention is characterized in that the voltage drop of a voltage drop exceeding 0.41 V is higher than 70%. The wire of the present invention should satisfy the above condition (3). If the oil is less than 0.25 g / 10 kg wire, the feed resistance will exceed 60 N due to mechanical friction with the pipe liner. On the other hand, if the oil volume is greater than 1.5 g / 10 kg wire, excess oil will cause blockage of the pipe liner and slippage of the feed roller. The oil which can be used in the present invention may be selected from the group consisting of palm oil (vegetable oil), tallow (animal oil) and polyisoprene (synthetic oil). If the voltage drop of more than 0.41 V is higher than 80%, the feed resistance does not exceed 50 N regardless of the welding current in the feed system of a 6 m long pipe liner cable with one ring. This is shown in Fig. 12 described later. Therefore, it is required that the voltage drop exceeding 0.41 V is higher than 80%. Also, if the voltage drop of more than 0.41 V is higher than 90%, regardless of the welding power - 16 - (14) 1295606 flow in the feeding system of a 6-meter pipe-lined cable with one ring, the feed resistance No more than 40 N. This is shown in Fig. 14 described later. Therefore, it is required that the voltage drop of more than 0·41 V should be higher than 90%. In addition, it should be preferable that the wire of the present invention per 10 kg is loaded with 0·〇1 in the surface layer of the surface or depth of 100 μm. 〇. 2 5 g of a lubricant which is at least one selected from the group consisting of MoS2, WS2 and ZnS. If the wire has the lubricant specified above, the feed resistance changes no more than 10 N, regardless of the welding conditions in the feed system of a 6 m long pipe liner cable with one ring. For quantities greater than 0.25 g / 10 kg of wire, the lubricant can become clogged in the pipe liner cable. Regardless of the type of wire (solid wire or powder cored wire), the relationship between the voltage drop and the state of the sliding contact point is basically correct. The state of the sliding contact is also affected by the contact force between the wire and the tip. If the contact force is zero, there will be an infinite contact resistance that will hinder a stable power supply. If the contact force is greater than 50 gf, the sliding contact point is still stable. If the wire passes the tip, it has an apparent diameter (or free loop diameter) of about 75 0 mm (75 0 ± 50 mm), then no matter what type of wire (solid or powder cored wire) 'As long as the wire surface is properly adjusted, the sliding contact point is still stable. Incidentally, it is assumed that the welding wire of the present invention has a diameter of 〇·8 to U mm. A sample of a non-coppered solid wire was prepared by roll drawing, and the voltage drop was tested in the following manner. Table 1 below shows the composition of the wire (the balance is steel and unavoidable impurities). -17- (15) 1295606 Table 1 (Unit: mass%) C Si Μη Ρ S Ti 0.04 0.8 1.2 0.010 0.010 0.24 Pickled rods of 5 · 2 5~5.6 mm in diameter by a series of hole molds and roll molds . Drawing a 5.5 mm diameter wire into a 1.2 mm diameter wire reduces the diameter by a total of 4.3 mm. Fig. 7 is a graph in which the diameter reduction produced by the roll mold is plotted on the abscissa and the voltage drop at the time of welding is plotted on the ordinate. It is noted from Fig. 7 that the voltage drop increases as the amount of diameter reduction produced by the roll die increases. Another sample was prepared by intermediate annealing (when the diameter was 2.4 mm), pickling, drawing to the final diameter with a sodium soap through a hole die, and thoroughly washing with warm water at 30 °C. The obtained sample had an extremely thin oxide film on its surface, so the voltage drop was remarkably increased. Fig. 8 is a graph showing the relationship between the voltage drop (longitudinal coordinates) and the product of the washing water temperature and the washing time (abscissa). As is apparent from Fig. 8, the voltage drop during welding increases in proportion to the washing time or the temperature of the washing water. The wire sample is instantaneously heated to a high temperature in air using a high frequency induction heating device (oscillation frequency of 20 kHz). Fig. 9 is a view showing the relationship between the induction heating temperature and the voltage drop at the time of welding. It should be noted that if the heating temperature is 300 ° C, the voltage drop is significantly increased. Heating above 4 5 °C produces annealed soft wire that is not suitable for welding. Figure 1 〇 is a graph showing the relationship between the amount of ZnS on the surface of the wire (abscissa) and the voltage -18-(16) 1295606 drop (ordinate). It is noted from Fig. 10 that the voltage drop increases when the surface of the wire is coated with a sufficient amount of oil and ZnS. It is also noted that the voltage drop increases proportionally with the amount of ZnS. It has also been found that this relationship is also correct for other sulfides. EXAMPLES Tests were carried out using a solid wire having a chemical composition equivalent to JIS YGW1 1. Table 2 below shows the composition of the solid wire (the balance is steel and unavoidable impurities). Table 2 (Unit: mass%) C Si Μη Ρ s Ti 0 0.04 0.80 1.45 0.0 10 0.0 10 0.24 0.0040 When the wire has a diameter of 5.25 mm, it is pickled. Then, the wire was subjected to cold drawing, washing and surface treatment under the conditions shown in Examples 1 to 5. In cold drawing, the wire was drawn to a diameter of 1.185 mm of 0.015 mm. In the surface treatment, oil is applied to the surface of the wire. Incidentally, the program of the present embodiment is also effective for a wire or a powder cored wire having a final diameter of 0.6 to 1.6 mm. Using the test equipment shown in Figure 1, the welding current and voltage were changed to evaluate the effect (feeding performance). The unit has a 6 m long torch and a ring (300 mm diameter) that imparts resistance to the feed. -19- (17) 1295606 Example 1 A sample wire was prepared by dry-drying a hole through a hole mold to reduce the diameter from 5 · 5 mm to 1.2 mm. The last drawn wire was immersed in hot water at 60 ° C for 2 seconds for washing. After drying, the washed wire was coated with a synthetic oil (polyisobutylene) in an amount of g 8 g / 1 〇 kg. Incidentally, the finally drawn wire is not subjected to skin pass rolling using oil (for a slight reduction in the section). Fig. 11 is a graph showing the relationship between the welding current and the feeding resistance. Note that the maximum feed resistance is 60 N. Therefore, unless the feed resistance exceeds 100 N, no slip occurs on the supply roll having a clamping force of about 1 〇〇 N. Thus, the sample wire of the present embodiment satisfies the minimum requirements regardless of the slight fluctuation in the feed rate of the wire (the metal powder does not block the tip, the springliner and the pipe). Example 2 Drying with a sodium soap through a hole die until the diameter was reduced from 5.5 mm to 2.4 mm, dry-rolling through a roll die until the diameter was reduced from 2.4 mm to 1.25 mm and dry-drying with a sodium soap through the hole mold until the diameter was The sample wire was prepared by reducing the 1.25 mm to 1.2 mm. The last drawn wire was immersed in hot water at 70 °C for 2 seconds for washing. After drying, the washed wire was coated with a synthetic oil (polyisobutylene) in an amount of 〇 8 g/l 〇 kg. Figure 12 is a graph showing the relationship between welding current and feed resistance. Note that the maximum feed resistance is 50 N. The sample wire in this example has minimal fluctuations in the feed rate, giving a minimum amount of weld slag. -20- (18) 1295606 Example 3 Drying with a sodium soap through a roll die until the diameter is reduced from 5 · 5 mm to 1.28 mm and dry-drying through a hole mold with sodium soap until the diameter is reduced from 1.28 mm to 1.2 mm, This prepared a sample wire. The last drawn wire was immersed in hot water at 65 °C for 2 seconds for washing. After drying, the washed wire was coated with a synthetic oil (polyisobutylene) in an amount of 0.8 g / 10 kg. Fig. 13 is a graph showing the relationship between the welding current and the feeding resistance. It is to be noted that the sample wire of this embodiment produces a stable feed resistance, and even if a large welding current is used, the rate of occurrence of welding defects is low. Example 4 A sample wire was prepared by dry-drawing with a potassium soap through a roll die until the diameter was reduced from 5 · 5 mm to 1.25 mm and dry-drying through a hole mold with sodium soap until the diameter was reduced from 1.25 mm to 1 · 2 mm. . The last drawn wire was immersed in hot water at 65 ° C for 2 seconds for washing. After drying, the washed wire is coated with 〇 8 g / 1 〇 k g of synthetic oil (polyisobutylene) and 〇 . 〇 1 5 g / 10 1 ^ amount! ^〇82. Fig. 14 is a graph showing the relationship between the welding current and the feeding resistance. It is to be noted that the sample wire of this embodiment produces a stable low feed resistance with greatly reduced weld slag and fumes. Example 5 Dry-drying through a roll mold with the lubricant specified below until the diameter was reduced from 5.5 mm to 1 · 25 mm and dry-drying through a hole mold with sodium soap until the diameter was from -21 - (19) 1295606 1.2 5 mm The sample wire was prepared by reducing it to 1.2 mm. The lubricant consists of a sodium soap or potassium soap, a softening point modifier such as nitrite and phosphate, and a sulfide selected from the group consisting of MOS2, WS2 and ZnS. The last drawn wire was immersed in hot water at 65 ° C for 2 seconds for washing. After drying, the washed wire is coated with a synthetic oil (polyisobutylene) in an amount of 8 g / 10 kg and MoS2, WS2 and ZnS in a respective amount of 0.05 g / 10 kg (the total amount of sulfide is 0.15) g / 10 kg) Figure 15 is a graph showing the relationship between welding current and feed resistance. It is to be noted that the sample wire of this embodiment produces a very low feed resistance regardless of the welding current, and can be supplied at a constant rate over the entire range of the actual welding current. Table 3 shows the threshold voltage at which the voltage drop exceeds 〇·4ΐ v and the voltage drop of more than 0 · 4 1 V is higher than 70%, which is suitable for the data shown in Figure 7~1. Incidentally, the data in Table 3 is included in the data of the examples 丨 to 5. -22- (20) 1295606 Table 3

Threshold voltage exceeding 70% 槪 rate of 0.41 V Remarks Becco (%) (V) (corresponding embodiment) Figure 7-1 53% 0 .3 1 V Figure 7-2 75% 0 .44 V 7-3 76% 0 • 46 V Example 2 Figure 7-4 79% 0 .50 V Example 3 Figure 7-5 84% 0 • 5 1 V Example 4 Figure 7-6 85% 0 • 52 V Implementation Example 5 Figure 8-1 53% 0 .35 V Figure 8-2 57% 0 .39 V Figure 8-3 54% 0 .36 V Figure 8-4 70% 0 .41 V Figure 8-5 76% 0 . 45 V Example 1 Figure 8-6 83% 0 .50 V Figure 8-7 83% 0 .50 V Figure 8-8 84% 0 .5 1 V Figure 8-9 85% 0, .52 V Figure 9- 1 50% 0. .29 V Figure 9-2 52% 0, .3 1 V Figure 9-3 55% 0 ' .37 V Figure 9-4 75% 0. .44 V Figure 9-5 75% 0, , 45 V Figure 10-1 45% 0. .24 V Figure 10-2 58% 0_ 39 V Figure 10-3 70% 0. , 4 1 V Figure 10-4 11% 0· , 47 V Figure 10-5 75% 0. 45 V Figure 10-6 76% 0· 46 V Figure 10-7 73% 0· 43 V Figure 10-8 75% 0· 45 V [Simple diagram] -23- (21) 1295606 1 is a view showing an apparatus for measuring a melt cohesive force and a feed resistance. Fig. 2 is a graph showing the relationship between the welding current and the feed resistance measured by the apparatus shown in Fig. 1. Figure 3 is a graph showing the relationship between the voltage drop (Ε〇 and the contact temperature (Tmax) at a tip temperature (TERT) of 300 K, 400 1 K, 500 K, 600 K, 700 K, 800 K, and 900 K. Figure 4(a) is a cross-sectional view of the tip, and Figure 4(b) is a cross-sectional view of the torch equipped with a tip φ. Figure 5 (a) shows the welding current and voltage observed in the comparative example. Figure 5 (b) is a graph showing the relationship between the welding current and the voltage drop observed in the embodiment. Figures 6 (a) and 6 (b) show the welding current from 14 Figure 0 (a) and 6 (b) correspond to Figure 5 (a) and 5 (b) ° ® respectively, when 0 A changes to 180 A and the amplitude of the voltage drop occurs in the range of 40 A. Fig. 7 is a graph showing the voltage drop (ordinate) at the time of welding as the diameter is reduced by the roll mode (abscissa). Fig. 8 is a graph showing the voltage drop (ordinate) and the temperature of the washing water and the washing time. Fig. 9 is a graph showing the relationship between the induction heating temperature and the voltage drop at the time of welding. Fig. 10 is a graph showing the amount of ZnS. A graph showing the relationship between (abscissa) and voltage drop (ordinate). Fig. 11 is a diagram showing the relationship between the welding current and the feeding resistance in Example 1 • 24-(22) 1295606. 2 is a graph showing the relationship between the welding current and the feeding resistance in Example 2. Fig. 13 is a graph showing the relationship between the welding current and the feeding resistance in Example 3. Fig. 14 shows the implementation. Fig. 15 is a graph showing the relationship between the welding current and the feeding resistance in Example 5. [Main element symbol description] 1 : Reel 2 : Feed roller 3 : Pipe liner 4b : Workbench # 4a : Frame 5 : Welding torch 5 a : Dynamometer 6 : Welding plate • 7 : Voltmeter 8 : Bracket 9 : Dynamometer 1 0 : Hall device 1 1 : Welding wire - 25 - (23) 1295606 1 2 : Welding power supply] 3 : Recorder 2 0 : Welding torch 21 : Cable 22 : Insulation sleeve 23 : Conductive connector 24 : Power cable

25 : Insulation cylinder 26 : Sleeve 2 7 ··Inlet 2 8 : Positive pole 3 0 : Tip 3 1 : Main body 3 2 : Insulation sleeve 3 3 : Front end

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Claims (1)

(1) 1295606 X. Patent application scope i. A non-coppered copper wire having a current supply length of 2 to 4 mm at an average current of 150 to 170, a tip-to-body material distance of 20 to 24 mm, and a bending of the wire The free free loop has a diameter of 7 〇〇 to 8 〇〇 mm, and the non-filament allows the CO 2 gas to be coated by arc welding so that the current is 1 800 A at the wire and the tip The voltage between 〇· 4 1 V is greater than 70%, and the wire is loaded with 0·25~1.5 g of oil per 1 〇kg, which is selected from vegetable oil, mineral oil and synthetic oil. At least one of them. 2 • The non-coppered wire as described in item 1 of the patent application has a voltage drop of more than 80% above 0.41 V. 3 • The non-coppered wire as described in item 1 of the patent application has a voltage drop of more than 90% above 0.41 V. 4. The wire of the non-coppered wire kg as described in claim 1 is loaded with a lubricant of 〇·5 5 g on the surface or a surface layer of 10 μm deep, which is selected from the group consisting of μ 〇 S 2, at least one of WS 2 and . A, the ring between the wire (the copper plating 140 ~ drop more than its surface oil, which, among them, every 10 0.01 ~ ZnS -27-