JPH08206879A - Method for manufacturing steel wire for arc welding - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents contamination of water-soluble lubricant in wet wire drawing without losing the effect of dry lubricant, enables smooth and highly efficient wire drawing, and is a long conduit cable. A method for manufacturing steel wire for arc welding, which does not slip at the feed roller and has a low wire friction feedability in the conduit tube even when it is welded under high current welding conditions. To provide. [Composition] In a method for manufacturing a steel wire for arc welding,
After the plating step, 5 to 50 wt% of one or two kinds of molybdenum disulfide and tungsten disulfide is mixed with one or more kinds of fatty acid having a melting point of 50 ° C. or higher, monohydric or dihydric alcohol ester and petroleum wax. A dry lubricant with a volatile component of an animal or vegetable oil or synthetic oil dispersant 5-1
The wet lubricant adjusted to 5 wt% was drawn again with the lubricant, and then wet drawn with the water-soluble lubricant to adjust the amount of the attached lubricant to 0.10 to 0.80 g per 10 kg of the wire. Characterize.

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 a steel wire for arc welding, and more particularly to a feed method which maintains dry lubrication performance and prevents contamination of a water-soluble lubricant in wet wire drawing. TECHNICAL FIELD The present invention relates to a method for producing a steel wire for arc welding having good properties.

[0002]

2. Description of the Related Art The most general method for producing a steel wire for arc welding is to draw a wire from a raw wire or flux-filled wire to a diameter of 2 to 4 mm with a roller or a hole die, an annealing step, and a pickling step. , Plating process,
This is a method in which the step of drawing with a hole die to the final size diameter is selected and performed sequentially in accordance with 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 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 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, with respect to the wire for arc welding, with the progress of automation of welding and improvement of efficiency, the welding condition at higher current is being adopted, and as a result, the wire feeding speed is necessarily high. Becomes 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. Tend to be long and 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 inside the conduit cable, which hinders the wire feeding during welding and makes the arc unstable. Therefore, the problem that welding cannot be performed occurs.

To solve these problems of wire drawability during production of arc welding wires and feedability during welding, higher fatty acids and alkali metal salts of higher fatty acids have hitherto been disclosed in, for example, Japanese Patent Publication No. 58-46398. A method of wet drawing with a lubricant diluted with a volatile solvent and applying an appropriate amount of the lubricant to the surface of the wire. JP-A-5-23731 discloses a lubricant comprising polytetrafluoroethylene, molybdenum disulfide, graphite and the like. Various methods have been proposed such as wire drawing and a method of applying the lubricant. However, even with these methods, the work efficiency is poor in wet drawing as described above,
In dry drawing, it may be difficult to evenly 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.

[0005]

Therefore, the present invention can prevent the contamination of the water-soluble lubricant in the wet wire drawing without losing the effect of the dry lubricant, and can perform the wire drawing smoothly and with high efficiency. Even when using a long conduit cable and welding under high current welding conditions, there is no wire slip at the feeding roller section, and there is little friction resistance in the conduit tube, so good feeding performance is achieved. An object of the present invention is to provide a method for manufacturing a steel wire for arc welding.

[0006]

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
Ester of polyhydric alcohol and petroleum wax, molybdenum disulfide and tungsten disulfide, and a dispersant of animal or vegetable oil or synthetic oil mixed as a wet lubricant were used for dry wire drawing, and then wet drawing in a water-soluble lubricant. Wires can be drawn smoothly and with high efficiency by adjusting the amount of lubricant applied by dry drawing, and in the case where long conduit cables are used and welding is performed under high current welding conditions. Also, there is little wire slip at the feeding roller,
Moreover, they have found that the feedability is extremely good, such as low frictional resistance in the conduit tube.

That is, the gist of the present invention is
In a general method for producing a steel wire for arc welding, after the plating step, one 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 added to molybdenum disulfide and disulfide. 5 to 50 wt% of one or two kinds of tungsten mixed in a dry lubricant, and a dispersant of animal or vegetable oil or synthetic oil in a volatile content of 5
Approximately 15 wt% of the wet lubricant is mixed again to draw the wire, and then wet drawing is performed in a water-soluble lubricant so that the amount of the attached lubricant is 0.10 to 0.80 g per 10 kg of the wire.
It is in the place of adjusting. Further, it is preferable that the dry lubricant and the dispersant of animal or vegetable oil or synthetic oil be 5 in volatile content.
The mixing ratio of the wet lubricant adjusted to ˜15 wt% is 40 to 6
It is to adjust to 0:60 to 40 wt%.

[0008]

[Function] After the plating step, a fatty acid having a melting point of 50 ° C. or higher,
5 to 50 wt% of monohydric or dihydric alcohol ester of fatty acid and one or more petroleum waxes and one or two molybdenum disulfide and tungsten disulfide.
When a dry lubricant is mixed with a mixed lubricant, a dispersant of animal or vegetable oil or a synthetic oil is mixed as a wet lubricant, and they are attached to the wire surface. This type of fatty acid, a monohydric or dihydric alcohol ester of a fatty acid, and one or more petroleum waxes deposited by dry drawing are mixed with one or two molybdenum disulfides and one or two tungsten disulfides. If it adheres too much, it will contaminate the water-soluble lubricant in the next wire wet drawing process,
By applying an appropriate amount in a state diluted with a wet lubricant, the water-soluble lubricant in the wet wire drawing is prevented from being contaminated.

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 increased by die heat generation during wet wire drawing. Since it does not melt even by the above, wire drawing can be performed while uniformly adhering one or two kinds of molybdenum disulfide and tungsten disulfide and animal oil or vegetable oil to the product diameter. Therefore, it is possible to draw wire up to the product diameter smoothly and with high efficiency, and even if it is welded under high current welding conditions using a long conduit cable,
Since the frictional resistance with the conduit tube is reduced, the wire feedability is improved.

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 generated by the die during 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 will cause the monohydric or dihydric alcohol ester of fatty acid and petroleum wax to melt in the conduit tube. Partially agglomerates and the frictional resistance with the conduit tube increases, resulting in poor wire feedability.

One or two kinds of molybdenum disulfide and tungsten disulfide mixed with one or more kinds of fatty acids having a melting point of 50 ° C. or higher, 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-mentioned lubricants, one or two kinds of fatty acids, esters of monohydric or dihydric alcohols of fatty acids and petroleum waxes are mixed with one or two kinds of molybdenum disulfide and tungsten disulfide. Or when a dispersant of synthetic oil is mixed as a wet lubricant, it becomes
Since esters of dihydric or dihydric alcohols and petroleum waxes are water insoluble, the use of a lubricant diluted with a wet lubricant of a dispersant of animal or vegetable oils or synthetic oils results in fatty acids, monohydric or dihydric alcohols of fatty acids. An appropriate amount of ester and petroleum wax are attached to the surface of the wire, and the dry lubricant solidifies during wire drawing, forming a tunnel shape and preventing the occurrence of die roughening. Therefore, it is preferable that the wet lubricant prepared by adjusting the dispersant of animal or vegetable oil or synthetic oil to 5 to 15 wt% by volatile content is adjusted to 40 to 60:60 to 40 wt% with respect to the dry lubricant and mixed. However, if the amount of the wet lubricant prepared by adjusting the dispersant of the animal or vegetable oil or the synthetic oil to 5 to 15 wt% by volatile content is less than 40 wt% with respect to the dry lubricant, the dry lubricant adheres to the wire too much, The next wet wire drawing will contaminate the water-soluble lubricant. Further, if the dispersant of animal or vegetable oil or synthetic oil exceeds 60 wt% with respect to the dry lubricant, it becomes the same as wet drawing, and the effect of dry drawing is lost.

Next, fatty acids uniformly attached by dry drawing,
Adjusting the dispersant of animal or vegetable oil or synthetic oil by volatile content to mono- or di-hydric alcohol ester of fatty acid and petroleum wax to one or more species, molybdenum disulfide and tungsten disulfide to one or two species. The drawn wet lubricant was drawn again with a lubricant mixed again, and then wet drawn in a water-soluble lubricant to give an adhesion lubrication amount of 0.1 per 10 kg of wire.
Adjust to 0-0.80 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. If the adhered amount exceeds 0.8 g, the wire slips at the wire feeding roller portion and unevenness occurs in the wire feeding, and the arc becomes unstable. Here, a dispersant of a fatty acid, an ester of a monohydric or dihydric alcohol of a fatty acid, one or more petroleum waxes, one or two molybdenum disulfides and tungsten disulfides, and an animal or vegetable oil or a synthetic oil is volatilized. The amount of the lubricant mixed with the wet lubricant adjusted in 1. is adjusted by the die surface reduction rate of wet drawing and the number of dies. In this case, the larger the die surface reduction rate, the smaller the adhesion amount.

The fatty acids referred to in the present application are those having a melting point of 50 ° C. or higher such as myristic acid, palmitic acid, stearic acid and melissic acid, and monohydric or dihydric alcohol esters of fatty acids are beeswax and carnauba wax. , Wax having a melting point of 50 ° C. or higher, such as 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.

[0015]

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 13%) specified in JIS G3313 are 2.6, 3.0,
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 in 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.

[0018]

[Table 1]

In Table 1, the test No. 1 to 6 are production examples of the steel wire for arc welding according to the present invention, and test No. 7-
11 is a comparative example. Test No. 1 according to the present invention. 1-6
Is a wet lubricating in which the melting point of fatty acids, esters of monohydric or dihydric alcohols of fatty acids and petroleum waxes is 50 ° C, and molybdenum disulfide and tungsten disulfide and dispersants of animal and vegetable oils or synthetic oils are adjusted by volatile matter. Since the amount of lubricant is adjusted by wet drawing after dry drawing with a lubricant containing an appropriate amount of lubricant, the slip ratio at the wire feed roller and the armature current of the feed motor are low during welding. The arc was stable and the result was extremely satisfactory. Test No. Since 7 uses a large amount of vegetable oil for dry wire drawing, it is the same as wet wire drawing, and the heat of the die causes the temperature of the wet lubricant to rise during wet wire drawing, so that it does not evenly adhere to the wire surface. Had a high armature current, and the slip ratio at the feed roller portion was also high, which deteriorated the wire feedability and made the arc unstable.

Test No. No. 8 was dry drawn with a lubricant containing a large amount of ester, so the lubricant did not adhere evenly, and it was difficult to adjust the adhered amount even in the next wet drawing, and the amount of lubricant was uneven in the product diameter. At welding, the arc was unstable because the wire slip ratio and the armature current of the feed motor increased at the feed roller. Test No. Since No. 9 was dry-drawn with a lubricant that did not use vegetable oil, the dry lubricant adhered to the surface of the wire too much and contaminates the water-soluble lubricant. The armature current of the feed motor became high and the arc became unstable. Test No. Since No. 10 was dry-drawn with a lubricant having a large amount of vegetable oil and animal oil, the amount of the wire surface dry-adhered lubricant was small and the amount of spatter during welding was large. Test No.
In No. 11, the ratio of the dry lubricant to the wet lubricant was 70:30, which was a large amount of the dry lubricant, and the dry lubricant solidified and formed into a tunnel shape during wire drawing, and die roughening occurred, making wire drawing impossible.

[0021]

As described above in detail, according to the method for producing a steel wire for arc welding of the present invention, the contamination of the water-soluble lubricant in the wet drawn wire is prevented without losing the effect of the dry lubricant. Prevents smooth wire drawing with high efficiency.Even when using a long conduit cable, even when welding under high current welding conditions, there is no wire slip at the feed roller and the inside of the conduit tube Since good feedability with less frictional resistance can be obtained, it greatly contributes to the productivity of the steel wire for arc welding and the improvement of welding 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

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C10M 105: 22 105: 32 125: 22) C10N 40:32 70:00 (72) Inventor Satoru Ando 7-6-1, Higashi Narashino, Narashino, Chiba Prefecture Narashino Factory of Nittetsu Welding Co., Ltd.

Claims (2)

[Claims] 1. A method for producing a steel wire for arc welding, 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 are used. And a dry lubricant prepared by mixing 1 or 2 kinds of tungsten disulfide in an amount of 5 to 50 wt% with a wet lubricant prepared by adjusting a dispersant of animal or vegetable oil or a synthetic oil to 5 to 15 wt% by volatile content. Wire drawing with a lubricant, and then wet drawing in a water-soluble lubricant, so that the amount of the attached lubricant is 0.10 to 10 per 10 kg of wire.
A method for producing a steel wire for arc welding, which comprises adjusting to 0.80 g. 2. The mixing ratio of the dry lubricant according to claim 1 and the wet lubricant prepared by adjusting the dispersant of animal or vegetable oil or synthetic oil to 5 to 15 wt% by volatile matter is 40 to 60:60 to 40 wt.
% Of the steel wire for arc welding.