JPH0970691A - Method for manufacturing wire for arc welding - Google Patents

Abstract

(57) [Abstract] [Problem] A wire can be drawn smoothly and with high efficiency, and even when a long conduit cable is used and welding is performed under high current welding conditions, there is no slip at the feeding roller,
Another object of the present invention is to provide a method for manufacturing an arc welding wire which has a low frictional resistance in a conduit tube and a good wire feedability. In a method for manufacturing a steel wire for arc welding, molybdenum disulfide and disulfide are added to one or more of fatty acids having a melting point of 50 ° C. or more, esters of monohydric or dihydric alcohols and petroleum wax after a plating step. It is characterized in that dry drawing is performed using a lubricant composed of one or two kinds of tungsten and polyethylene glycol, and then wet drawing is performed with a water-soluble lubricant to adjust the amount of the lubricant adhered by dry drawing. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an arc welding wire, and more particularly to a method for manufacturing an arc welding wire having excellent drawability and excellent feedability during use (welding). Is.

[0002]

2. Description of the Related Art The most general method for manufacturing an arc welding wire is a step of drawing a wire after wire filling or flux filling with a roller or a hole die to a diameter of 2 to 4 mm, an annealing step, a pickling step, This is a method in which the plating step and the step of wire drawing with a hole die to the final size diameter are sequentially performed by selecting them according to the shape of the product. In the step of wire drawing to the final size diameter, the wire is generally manufactured by wet wire drawing with a smooth surface condition and good color tone. However, since a water-soluble lubricant is generally used in wet wire drawing, the wire surface film is thin when passing through the die and the wire's slipperiness is somewhat poor, so scratches are likely to occur on the wire surface and the surface reduction rate per die cannot be increased. However, since it is necessary to use a lot of dice, there is a problem in terms of efficiency.

On the other hand, in dry wire drawing, an inorganic or anhydrous lubricant is generally used as a lubricant, but there is a problem that it is difficult to uniformly apply the lubricant to the wire surface.
In addition, the welding wire for arc welding is becoming more automated and more efficient, and the welding conditions at higher currents are being adopted. As a result, the wire feeding speed is inevitably high. In addition, depending on the target structure, welding is often performed in narrow spaces, and from the viewpoint of ease of use in these places, the conduit cable from the feed roller of the wire feeder of the welding machine to the welding torch is used. Are long and tend to be bent.

When the conduit cable is used long and bent in this way, the friction resistance increases when the wire passes through the conduit tube in the conduit cable, which hinders the feeding of the wire during welding and causes no arcing. There is a problem that it becomes stable and welding cannot be performed. To solve these problems of wire drawability at the time of manufacturing the arc welding wire and feedability at the time of welding, a conventional method, for example, Japanese Patent Publication No.
-46398 discloses a method of wet drawing a higher fatty acid and an alkali metal salt of a higher fatty acid with a lubricant diluted with a volatile solvent and applying an appropriate amount of the lubricant to the wire surface. Various methods have been proposed, such as wire drawing with a lubricant made of ethylene tetrafluoride, molybdenum disulfide, graphite or the like, and a method of applying the lubricant.

However, even with these methods, the work efficiency is poor in wet wire drawing as described above, and in dry wire drawing, it may be difficult to uniformly apply the lubricant to the wire surface. Also, when welding, using a long conduit cable and welding under high current welding conditions, the wire slips at the feed roller and friction resistance increases in the conduit tube, causing arcing. At present, the improvement of the wire feedability such as instability is still insufficient.

[0006]

SUMMARY OF THE INVENTION Therefore, the present invention is capable of smoothly and highly efficiently drawing a wire, and when a long conduit cable is used and welding is performed under high current welding conditions, the feeding roller is also used. It is an object of the present invention to provide a method for manufacturing an arc welding wire which has no wire slip at a portion thereof, has a small frictional resistance in a conduit tube, and is excellent in feedability.

[0007]

In order to achieve the above-mentioned object, the present inventors have studied various wire manufacturing methods, and as a result, as a pretreatment for the wire drawing step up to the final size diameter, which is the above step. High melting point fatty acid, fatty acid monovalent or bivalent
Lubrication of polyhydric alcohol ester and petroleum wax by dry drawing using molybdenum disulfide and a mixture of tungsten disulfide and polyethylene glycol, and then wet drawing in a water-soluble lubricant. By adjusting the amount of agent adhered, it is possible to draw wire smoothly and with high efficiency, and even when using long conduit cables and welding under high current welding conditions, wire slip at the feed roller part It has been found that the feedability is extremely good, such as a small amount of oil and a small frictional resistance in the conduit tube.

That is, the gist of the present invention is to
In a general method for producing a wire for arc welding, one or more fatty acids having a melting point of 50 ° C. or higher, monohydric or dihydric alcohol esters of fatty acids and petroleum wax after the plating step are molybdenum disulfide and tungsten disulfide. Dry wire drawing is performed by using a lubricant prepared by mixing polyethylene glycol with polyethylene glycol, and then wet drawing is performed in a water-soluble lubricant to adjust the amount of the lubricant adhered by dry wire drawing. Also preferably, 5 to 50 wt% of one or two kinds of molybdenum disulfide and tungsten disulfide are added to one or more kinds of fatty acid having a melting point of 50 ° C. or higher, ester of monovalent or divalent alcohol of fatty acid and petroleum wax. Dry wire drawing with a lubricant prepared by mixing 5 to 20 wt% of polyethylene glycol with polyethylene glycol, and then wet drawing in a water-soluble lubricant and attaching the lubricant adhered by dry drawing 0.10 to 0.
Adjust to 80g.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION After the plating step, one or more fatty acids having a melting point of 50 ° C. or higher, esters of monohydric or dihydric alcohols of fatty acids and petroleum waxes, and molybdenum disulfide and tungsten disulfide are used. Alternatively, they are uniformly attached to the wire surface by dry drawing with a lubricant prepared by mixing two kinds of polyethylene glycol. Next, one or more kinds of fatty acids, monohydric or dihydric alcohol esters of fatty acids and petroleum waxes, which are uniformly adhered by dry drawing, and one or more kinds of molybdenum disulfide and tungsten disulfide and polyethylene glycol. The adhering amount of the mixed lubricant is adjusted in the wet wire drawing step using a water-soluble lubricant.

Since the melting point of fatty acid, monohydric or dihydric alcohol ester of fatty acid, and one or more petroleum waxes is 50 ° C. or higher, the temperature of the wet lubricant is raised by die heat generation during wet wire drawing. Since it does not melt even by the above, wire drawing can be performed with one or two kinds of molybdenum disulfide and tungsten disulfide and polyethylene glycol uniformly attached up to the product diameter. Therefore, the wire can be drawn smoothly up to the product diameter with high efficiency, and even if it is welded under a high current welding condition using a long conduit cable, the friction resistance with the conduit tube is reduced, so the wire feedability is improved. It will be good.

If the melting point of the fatty acid, the monohydric or dihydric alcohol of the fatty acid and the petroleum wax is less than 50 ° C., it is melted by the wet lubricant whose temperature is raised by the heat of the die during the wet drawing, and the wire surface is melted. It may not adhere evenly. Even if they adhere evenly, the frictional heat of the wire in the conduit tube during welding and the heat generated by the welding cable wrapping the conduit liner may cause fatty acids, monohydric or dihydric alcohol esters of fatty acids, and petroleum wax in the conduit tube. Melted and partially aggregated,
The frictional resistance with the conduit tube increases and the wire feedability becomes poor.

One or two molybdenum disulfide and one or two tungsten disulfide mixed with one or two or more fatty acids having a melting point of 50 ° C. or more, monohydric or dihydric alcohol esters of fatty acids and petroleum waxes are 5 to 50 wt. % Is good. If it is less than 5 wt%, the friction resistance in the conduit tube becomes large during welding, and the wire feedability becomes poor. On the contrary, if it exceeds 50%, fatty acids in dry wire drawing,
A lubricant obtained by mixing one or more kinds of fatty acid monohydric or dihydric alcohol esters and one or more petroleum waxes with one or two kinds of molybdenum disulfide and tungsten disulfide cannot be uniformly attached to the wire surface, Even in the next wet drawing, it is difficult to adjust the adhesion amount, so the friction resistance in the conduit tube becomes large during welding, and the wire slips at the feeding roller part, resulting in poor wire feeding performance. .

In addition to the above lubricants, one or two kinds of fatty acids, esters of monohydric or dihydric alcohols of fatty acids and petroleum waxes and one or two kinds of molybdenum disulfide and tungsten disulfide are mixed, and polyethylene glycol is further added. , The fatty acids, esters of monohydric or dihydric alcohols of fatty acids and petroleum waxes are insoluble in water, whereas polyethylene glycol is water-soluble and the fatty acids, esters of monohydric or dihydric alcohols of fatty acids Also, petroleum wax is firmly adhered to the wire surface to prevent peeling during wire drawing and peeling in the feed roller and conduit tube during welding. If the content of polyethylene glycol is less than 5%, a large amount of water-insoluble components adheres to the wire surface and peels off during wire drawing, resulting in scratches on the wire surface, or peeling off inside the feeding roller and conduit tube during welding, leaving a lubricant. When the wire is accumulated, the wire slips at the feeding roller portion, or the frictional resistance in the conduit tube increases to make the arc unstable. Polyethylene glycol is 20
If it exceeds%, the amount of spatter generated during welding increases. In addition,
Although polyethylene glycol has various molecular weights, those having an average molecular weight of 2000 or more are preferable in the present invention.

Next, fatty acids uniformly attached by dry drawing,
A lubricant obtained by mixing polyethylene glycol with one or more molybdenum disulfide and one or more tungsten disulfide with one or more monohydric or dihydric alcohol ester of fatty acid and petroleum wax is a wire of 10 kg by wet drawing.
Per 0.10 to 0.80 g. If it is less than 0.10 g, the friction resistance in the conduit tube becomes large during welding, resulting in poor wire feedability. The amount of adhesion is 0.
If it exceeds 8 g, the wire slips at the wire feeding roller portion, causing unevenness in the wire feeding, and the arc becomes unstable.
Here, the amount of the lubricant obtained by mixing polyethylene glycol with one or more molybdenum disulfide and one or more tungsten disulfide in one or more kinds of fatty acid, ester of monohydric or dihydric alcohol of fatty acid and petroleum wax is , Wet wire drawing die reduction rate and number of dies.
In this case, the larger the die surface reduction rate, the smaller the adhesion amount.

The fatty acid referred to in the present invention is one having a melting point of 50 ° C. or higher, such as myristic acid, palmitic acid, stearic acid, melissic acid, and monohydric or dihydric alcohol ester of fatty acid is beeswax, carnauba. A wax having a melting point of 50 ° C. or higher, such as wax, cotton wax and synthetic wax of fatty acid. Further, petroleum wax refers to those having a melting point of 50 ° C. or higher obtained by refining petroleum, such as solid paraffin and betrolatum.

[0016]

The present invention will be described in more detail with reference to the following examples. First, YGW specified in JIS G3312
11 solid wire and YFW-C50DR seamless flux-cored wire (flux filling rate 14%) specified in JIS G3313 are 2.6, 3.2.
1.2 mm wire drawing / plating treatment with a diameter of 4.0 mm
Each manufacturing method shown in Table 1 up to a product diameter of mm
g was drawn into a spooled wire. The wire feedability was examined using the device shown in FIG. That is,
In order to increase the feeding resistance, the test wire drawn from the spool 2 is fed by a feeding motor 3 to a 6 m conduit cable 1 provided with a loop 2 rotation of a diameter of 150 mm, fed to a torch 4, and 10 kg of each wire are fed. Welded. The welding conditions at that time are as follows.

Welding current: 300 A Welding voltage: 30 V Welding speed: 30 cm / min Shielding gas: CO ₂ 20 liters / min Welding method: Bead on plate

The wire feedability was examined by measuring the armature current of the feed motor 3. The wire feedability becomes defective when the armature current exceeds 3.5 A, and the arc becomes unstable. The slip of the wire at the wire feeding roller portion was investigated by measuring the peripheral speed of the feeding roller and the wire speed at the outlet side of the feeding roller, and calculating the slip ratio by the following formula. If the slip ratio of the wire exceeds 5%, the wire feeding speed becomes slower and the wire feeding becomes uneven so that the arc becomes unstable and the amount of spatter is increased. Slip rate = (peripheral speed of feed roller) − (wire speed at exit side of feed roller) / (peripheral speed of feed roller) × 100 The results are shown in Table 1.

[0019]

[Table 1]

In Table 1, the test No. 1 to 5 are production examples of the steel wire for arc welding according to the present invention, and test No. 6 ~
12 is a comparative example. Test No. 1 according to the present invention. 1-5
Is a fatty acid, an ester of a monohydric or dihydric alcohol of a fatty acid and petroleum wax having a melting point of 50 ° C., and is subjected to dry wire drawing with a lubricant containing an appropriate amount of molybdenum disulfide and tungsten disulfide and polyethylene glycol, and then wet drawing. Since the amount of lubricant was adjusted with a wire, the slip ratio at the wire feeding roller and the armature current of the feeding motor were low during welding, and the arc was stable, resulting in a very satisfactory result.

Test No. In No. 6, since the melting point of lanolin used for dry drawing is low, the heat of the die heats the wet lubricant during wet drawing, and the lanolin melts on this and does not adhere evenly to the wire surface. The armature current of the feed motor was high, the slip ratio at the feed roller portion was also high, the wire feedability was poor, and the arc became unstable. Test No. No. 7 was dry-drawn with a lubricant containing a large amount of molybdenum disulfide and tungsten disulfide, so the lubricant did not adhere evenly, and it was difficult to adjust the amount of adhesion even with the next wet drawing, and the product diameter The amount of lubricant was not uniform, and the slip ratio of the wire and the armature current of the feed motor increased at the feed roller during welding, and the arc was unstable.

Test No. Since No. 8 was dry-drawn with a lubricant containing a small amount of molybdenum disulfide and tungsten disulfide, the lubricant on the wire surface was insufficient, and the wire slip ratio at the feed roller portion during welding and the armature of the feed motor The current became high and the arc became unstable. Test No. Since No. 9 was dry-drawn with a lubricant containing a large amount of polyethylene glycol, the amount of spatter generated during welding increased. Test N
o. Since No. 10 was dry-drawn with a lubricant containing a small amount of polyethylene glycol, scratches were generated on the wire surface during drawing. Also during welding, the slip ratio of the wire and the armature current of the feed motor increased at the feed roller portion, and the arc became unstable.

Test No. 11 is a fatty acid, a monohydric or dihydric alcohol ester of fatty acid, petroleum wax, molybdenum disulfide, and a large amount of lubricant remaining on the wire surface of tungsten disulfide and polyethylene glycol,
During welding, the wire slip ratio at the feed roller portion increased, causing unevenness in the wire feed, and the arc became unstable. Test No. No. 12 is a fatty acid, a monohydric or dihydric alcohol ester of fatty acid, petroleum wax, molybdenum disulfide, and a small amount of lubricant remaining on the wire surface of tungsten disulfide and polyethylene glycol, so friction resistance in the conduit tube during welding is low. As the armature current of the feeding motor increases, the slip ratio of the feeding roller portion also increases, the wire feeding performance deteriorates, and the arc becomes unstable.

[0024]

As described in detail above, according to the method for manufacturing an arc welding wire of the present invention, it is possible to draw a wire smoothly and with high efficiency, and a long conduit cable is used. Even when welding is performed with a wire, there is no wire slip at the feed roller and good feedability with low frictional resistance in the conduit tube is obtained. This greatly contributes to efficiency.

[Brief description of drawings]

FIG. 1 is a diagram showing a welding device used in an embodiment of the present invention.

[Explanation of symbols]

 1 Conduit cable 2 Spool 3 Feed motor 4 Torch

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Claims (2)

[Claims] 1. A method for producing an arc welding wire, wherein after the plating step, one or more fatty acids having a melting point of 50 ° C. or higher, monohydric or dihydric alcohol esters of fatty acids and petroleum wax, and molybdenum disulfide and To adjust the amount of lubricant adhered by dry drawing by dry drawing using a lubricant prepared by mixing one or two kinds of tungsten disulfide and polyethylene glycol, and then wet drawing in a water-soluble lubricant. A method for manufacturing an arc welding wire, comprising: 2. A method for producing an arc welding wire, wherein after the plating step, one or more of fatty acids having a melting point of 50 ° C. or higher, monohydric or dihydric alcohol esters of fatty acids, and petroleum waxes, and molybdenum disulfide are used. Dry wire drawing with a lubricant mixed with 5 to 50 wt% of one or two kinds of tungsten disulfide and 5 to 20% of polyethylene glycol, and then wet wire drawing in a water-soluble lubricant to adhere by dry wire drawing The applied lubricant is 0.10 per 10 kg of wire.
A method for manufacturing an arc welding wire, which comprises adjusting the weight to 0.80 g.