JP3279430B2 - Manufacturing method of wire for arc welding - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art For gas shielded arc welding 0.8 to 2.
The most common method of manufacturing a 0 mm thin wire is a process of drawing a wire after wire or flux filling to a diameter of 2 to 4 mm by a roller or a hole die, annealing process, pickling process, plating process, final process. This is a method in which the step of drawing with a hole die to the size diameter is selected and sequentially performed according to the shape and physical properties of the product. In the step of drawing to the final size diameter, the wire is generally produced by a wet drawing with a smooth surface state and a good color tone. However, in wet wire drawing, since a water-soluble lubricant is generally used, the wire surface coating is thin when passing through the dice, and the slipperiness of the wire is somewhat poor. However, there is a slight problem in efficiency because it is necessary to use many dies.

On the other hand, in the case of dry wire drawing, if metal soap or the like is used as a lubricant, the area reduction rate can be increased, but a lubricant removal treatment (eg, baking treatment) is required after wire drawing. In the case of an inorganic or anhydrous lubricant that does not require a baking treatment, there is a problem that the lubricant is difficult to be uniformly applied to the surface of the wire and that a flaw is generated on the surface of the wire. In addition, these arc welding wires tend to adopt welding conditions at higher currents as the automation and efficiency of welding progress, and as a result, the wire feeding speed is inevitably increased. Become. In addition, depending on the target structure, welding is often performed in narrow areas, 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 bent.

[0004] When the conduit cable is bent and used as described above, the frictional 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 unstable arcing. This causes a problem that welding cannot be performed. Conventionally, problems such as drawability during production of these arc welding wires and feedability during welding have been addressed, for example, in Japanese Patent Publication No. 58-4639.
JP-A-5-237 discloses a method in which higher fatty acids and alkali metal salts of higher fatty acids are wet-drawn with a lubricant diluted with a volatile solvent, and an appropriate amount of the lubricant is applied to the wire surface.
No. 31 discloses polytetrafluoroethylene, molybdenum disulfide,
Various methods have been proposed, such as wire drawing with a lubricant made of graphite or the like and a method of applying the lubricant.

[0005] However, even in these methods, as described above, the working efficiency is poor in wet drawing, and in dry drawing, baking treatment is required, and it is difficult to apply a lubricant uniformly to the surface of the wire. The surface may be scratched. Further, at the time of welding, it is still insufficient at present to improve the wire feedability when a long conduit cable is used and welding is performed under high current welding conditions.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a smooth and highly efficient wire without the need for baking treatment and no flaws on the wire surface. An object of the present invention is to provide a method for manufacturing an arc welding wire having good feedability even when welding is performed under conditions.

[0007]

Means for Solving the Problems The present inventors have studied various methods for producing a wire in order to achieve the above object. As a result, in the above-mentioned step, an ester or animal or vegetable oil was drawn in the step of drawing to the final size and diameter. Wire drawing using a lubricant that is mixed with an inorganic or anhydrous lubricant and then washing and adjusting the amount of lubricant attached by wire drawing with a water-soluble lubricant, eliminating the need for baking treatment on the wire surface It has been found that the wire can be drawn smoothly and efficiently with no flaws, and the feedability is extremely good even when welding is performed under high current welding conditions using a long conduit cable. is there.

That is, the gist of the present invention is as follows.
In the manufacturing process of the wire for arc welding, one or two kinds of ester or animal or vegetable oil composed of fatty acid and alcohol.
Wire drawing is carried out using a lubricant obtained by mixing 45 to 55% of one or two or more of a seed and an inorganic or anhydrous lubricant, and then the lubricant adhered by the wire drawing is washed and adjusted with a water-soluble lubricant.
After that, draw a skin pass and add the lubricant and water-soluble lubricant.
A method for producing a wire for arc welding, characterized in that the total amount is 50 to 500 mg per 10 kg of the wire .

The wire for arc welding referred to in the present invention is S
It is intended for steel wires containing Mo, Ti, Al and others from i-Mn and flux-cored wires containing various fluxes, alloys and deoxidizers. Wire diameter 0.8 ~
2.0 mm.

[0010]

[Effect] One or two or more esters of animal and vegetable oils composed of fatty acids and alcohols and one or two or more of inorganic or anhydrous lubricants are blended to obtain a uniform lubricant by drawing. The wire surface is not distributed smoothly even if the reduction in area during wire drawing is increased. In addition, since a large amount of lubricant attached during wire drawing is cleaned and adjusted with a water-soluble lubricant, an appropriate amount of lubricant adheres evenly to the wire surface during welding, and the conduit cable is long and high-current welding is performed. Under the conditions, the wire feedability is good and the arc is stable. The fatty acid in the present invention refers to animal and plant fatty acids, and the animal and vegetable oil refers to lard, sheep oil, liver oil, palm oil, rapeseed oil, olive oil and the like.

Lubricants to be mixed with esters composed of fatty acids and alcohols or animal or vegetable oils are inorganic or anhydrous lubricants. If it is an organic lubricant, baking treatment is required. Inorganic or anhydrous lubricants are
Any material that contains a suitable amount of a lubricant such as ethylene tetrafluoride, molybdenum disulfide, graphite, and the like, which are generally used in dry wire drawing, to improve wire drawability and wire feedability during welding can be used. One or more inorganic or anhydrous lubricants mixed with one or two of esters or animal and vegetable oils composed of fatty acids and alcohols are preferably mixed in an amount of 45-5.
5%.

If one or more of the inorganic or anhydrous lubricant is less than 45%, the amount of the inorganic or anhydrous lubricant attached to the wire surface is small, and flaws occur on the wire surface during drawing. . Conversely, if one or more of the inorganic or anhydrous lubricant exceeds 55%, the inorganic or anhydrous lubricant will not be uniformly mixed with the ester or animal or vegetable oil composed of fatty acid and alcohol, and the wire surface The wire does not adhere evenly, causing a flaw on the wire surface during wire drawing, or poor wire feedability during welding.

The step of drawing using a lubricant obtained by mixing an ester composed of a fatty acid and an alcohol or an animal or vegetable oil with an inorganic or anhydrous lubricant may be performed after plating, after annealing if not plated or after wire diameter. When the thickness is set to 4.0 mm or less, the lubricant is uniformly attached, so that the drawability is improved. In addition, even if the wet drawing is performed after the drawing, the drawing can be performed with the lubricant adhered, so that both the drawing property and the wire feeding property during welding are good. It is preferable to use a rotary die as a die used for wire drawing, because the lubricant can be more uniformly attached.

As the water-soluble lubricant, use is made of one obtained by mixing potassium soap, a fluororesin, boric acid, polyether polyol and the like in water in an appropriate amount. 600mg water-soluble lubricant by wire drawing
/ Eliminates a large amount of ester or animal or vegetable oil-based or anhydrous lubricant that has adhered to a large amount of 10 kg or more of wire, and removes it in an appropriate amount and uniformly on the wire surface to improve wire feedability during welding. I do. The amount of remaining lubricant is 50
~ 500mg / wire 10kg, preferably 5
If it is less than 0 mg / wire 10 kg, wire feedability at the time of welding will be poor, and if it exceeds 500 mg / wire 10 kg, lubricant will be accumulated in the chip, causing arc breakage and chip clogging.

FIG. 1 shows an example of a cleaning method using the water-soluble lubricant. In the figure, 3 is a water-soluble lubricant, 1 is a nozzle for ejecting the lubricant, 2 is a valve for adjusting the ejection pressure, P
Is a pump for circulating a water-soluble lubricant. The amount of the lubricant adhering to the surface of the wire 5 by wire drawing is adjusted by the number of nozzles 1 and the jet pressure with the water-soluble lubricant 3 jetted from the nozzle 1, and the water adhering by the frictional heat of the skin pass wire drawing 4. Is removed.

[0016]

[Example] YGW11 specified in JIS Z 3312
Solid wire, Y defined in JIS Z 3313
FW24 seamless flux-cored wire (flux filling ratio 14%) is drawn and plated to two diameters of 2.6mm and 3.0mm, and each production shown in Table 1 up to a product diameter of 1.2mm Each wire was drawn in a thickness of 1000 kg by a method and passed through a skin pass. In addition, the adjustment of the residual amount of wire surface of ester or animal or vegetable oil and inorganic or anhydrous lubricant,
The water-soluble lubricant was sprayed by the number of nozzles (2 to 4 nozzles) and the intensity of the pressure, and the attached water was removed by the frictional heat of drawing the skin pass.

The wire feedability was examined using the apparatus shown in FIG. That is, in order to increase the feed resistance, a test wire drawn from the spool 7 is supplied to a 6 m conduit cable 6 provided with two turns of a loop having a diameter of 200 mm by a feed motor 8 and sent to a torch 9, and each wire is sent. 10 kg were welded. The welding conditions at that time are as follows. Welding current: 300A welding voltage: 28～30V welding speed: 30 cm / min shield 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 8. The wire feedability becomes poor when the armature current exceeds 3.5 A, and the arc becomes unstable. Table 1 shows the results.

[0019]

[Table 1]

[0020]

[Table 2]

In Table 1, No. Nos. 1 , 3, and 4 are production examples of an arc welding wire according to the present invention. 6 to 10 are comparative examples. No. 1 according to the present invention. Nos. 1, 3 and No. No. 4 is drawn with a lubricant in which an appropriate amount of an ester or animal or vegetable oil and an inorganic or anhydrous lubricant are mixed, and then the water-soluble lubricant is used to wash and adjust the attached lubricant. The surface was good with no surface flaws, the armature current of the feed motor was low even during welding, and the arc was stable.

In the comparative examples, no. In No. 6, since no inorganic or anhydrous lubricant was mixed, wet drawing was performed by ester and palm oil, and the number of dies was small, so that many flaws were generated on the wire surface. Therefore, the welding was stopped. No.
In No. 7, since no ester or animal or vegetable oil was mixed, the inorganic or anhydrous lubricant did not uniformly adhere to the wire surface, and flaws occurred on the wire surface during drawing. In addition, even after washing with the water-soluble lubricant, the lubricant did not remain uniformly on the wire surface, and the armature current of the motor fed during welding was high, and the arc became unstable.

No. In No. 8, since the amount of the inorganic or anhydrous lubricant was small, the amount of the lubricant attached to the wire surface during drawing was reduced, and flaws occurred on the wire surface during drawing. In addition, since the residual lubricant was reduced by adjustment with the water-soluble lubricant, the armature current of the motor fed during welding was high, and the arc was unstable. No. In No. 9, since the amount of the inorganic or anhydrous lubricant was large, it could be mixed uniformly with palm oil, and the amount of adhesion to the wire surface during wire drawing became uneven, causing flaws on the wire surface. Further, the residual lubricant could not be adjusted with the water-soluble lubricant, and the armature current of the feed motor during welding was high, and the arc was unstable. No. Numeral 10 is a water-soluble lubricant, in which the amount of residual lubricant is not adjusted by cleaning the lubricant adhered by wire drawing in the previous process, so that the amount of residual lubricant is large and the lubricant is accumulated on the chip and the arc is broken. And chip clogging also occurred.

[0024]

According to the method for producing an arc welding wire of the present invention, it is possible to draw a wire smoothly and efficiently with no flaws on the wire surface, and to leave an appropriate amount of lubricant uniformly on the wire surface. Since it can be used, a long conduit cable can be used, and good feedability can be obtained even when welding is performed at a high current, greatly contributing to the productivity of arc welding wires and the improvement of welding efficiency. is there.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of an apparatus for cleaning a lubricant attached by wire drawing in a previous step with a water-soluble lubricant of the present invention.

FIG. 2 is an explanatory view showing a welding device used in an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nozzle 2 Valve 3 Water-soluble lubricant 4 Skin pass wire drawing 5 Wire 6 Conduit cable 7 Spool 8 Feeding motor 9 Torch P pump

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kazutaka Kurahashi 7-6-1 Higashi Narashino, Narashino-shi, Chiba Nippon Steel Welding Industry Co., Ltd. Narashino Plant (56) References JP-A-6-15485 (JP, A) JP-A-2-80196 (JP, A) JP-A-50-13732 (JP, A) JP-B-53-22930 (JP, B1) (58) Fields studied (Int. Cl. ⁷ , DB name) B23K 35/40 B21C 9/00-9/02 B23K 35/02 B23K 35/36

Claims (1)

(57) [Claims] In the process of producing a wire for arc welding, one or two kinds of esters or animal and vegetable oils composed of fatty acids and alcohols and one of inorganic or anhydrous lubricants.
Wire drawing is performed using a lubricant in which 45% or more of the seed or two or more kinds are mixed , and then the lubricant adhered by the wire drawing is washed and adjusted with a water-soluble lubricant. When
50 to 50 per 10kg of wire together with water-soluble lubricant
A method for producing a wire for arc welding, comprising 0 mg .