JPS58205697A - Production of flux cored wire for welding - Google Patents

Abstract

PURPOSE:To enable the production of a flux cored wire having homogenous quality and high performance in high production in the stage of producing the flux cored wire for welding, by painting a powder or granular flux electrostatically around a metallic wire, then inserting the wire in a steel pipe and drawing the same. CONSTITUTION:A mild steel wire W-1 is un-coiled from a spool 1, and is cleaned of the surface in a derusting and defatting device 2, whereafter the wire is dried 3 and is fed to an electrostatic coater 4. A flux F is painted electrostatically on the surface of the wire W-1 by an electrostatic dipping method or electrostatic spraying method. A powder adhesive agent is mixed with the flux in this case and the surface of the conductive material such as ferroalloy in the flux is coated with an insulating material utilizing the adhesive agent to improve electrostatic adhesion. The wire W-2 stuck with the flux is baked in a heating furnace 5 to stick the flux F to the wire; thereafter, the wire is inserted into a tubular pipe W-3 and is drawn to a welding wire with drawing dies 7a, 7b.

Description

[Detailed Description of the Invention] The present invention relates to a method for producing a flux shear wire for welding,
Specifically, the present invention relates to a method of uniformly filling a tubular pipe with flux to produce a homogeneous, high-performance flux-cored shear wire with high productivity.

A wire made by filling a metal sheath with flux for bath welding is called a flux shear wire or a composite wire. #Good porosity and can be used for on-site welding, ■Efficiency can be expected to be more than twice that of using coated arc welding rods, ■Shallow bathing method - good cracking resistance, etc. Since there are various characteristics, is it the field of eye movement or half-white vJ bathing? It is becoming popular as a subject. However, the growth rate of consumption is stagnant, reaching only about 10% of solid wire consumption.

The reasons for this sluggish growth include: ■ Too much fume, ■ Unreliable wire feedability, (Fuwax filled with wax easily absorbs moisture, and ■ Low productivity and high cost.) These problems are caused largely by the poor sealing performance of the flux by the metal sheath.

That is, it is manufactured by bending general flux-cored wire steel into a tube shape in the width direction, filling it with flux, and then stretching it to a predetermined 11f surface dimension. The two ends of the steel strip that meet are only pressed by the storm and lack sealing properties, so moisture may enter from this area and moisten the flux, or the feeding resistance at the welded portion may become uneven. This is thought to lead to unsteady feeding speed and poor contact with the current-carrying tip, resulting in the aforementioned problems.

As a precautionary measure to deal with such problems, for example, as seen in Japanese Unexamined Patent Publication No. 148494/1983, a steel strip is imported and shaped into a Urakaki Ffj shape, and the abutting portions of both side edges are seam bath welded. A method of sealing is known, and with such a method, it is possible to fake a flux-cored shear without the disadvantages described in J. However, with this method, the type and properties of the filling flux are limited because the heat input during seam bath welding causes the 7 lux to deteriorate and burn out.
If you try to perform seam welding by TIG bath welding or laser welding, you can only get a bath contact speed of about 7 to 10 m/min, resulting in extremely low productivity. Since an impeder has to be inserted and this impedes the 7 lux filling performance, the flux filling rate in the longitudinal direction of the wire is likely to become non-uniform.

On the other hand, for example, Japanese Patent Publication No. 45-80937 and Japanese Unexamined Patent Publication No. 5
As seen in Publication No. 6-148494, a seamless tubular wire is filled with 7 lux from one end and then stretched, and its surface is plated with a conductive material such as copper to make it conductive. Higher versions have also been proposed. With such a flux-cored shear wire, there is no seam in the outer shell, so there will be no deterioration or deterioration due to moisture absorption of the filling flux or exposure to bath heat. However, the work of filling powdery flux into the #B type tubular wire is itself extremely tedious, and it is extremely difficult to maintain a filling rate of about - over the entire length. 3 And the tir of the tubular wire
The conventional filling method, which utilizes the natural flow of flux and flux, is extremely inefficient at filling speeds, and it has often been observed that flux clogs in the middle of the tubular wire, resulting in the formation of unglazed areas.

In view of the above-mentioned circumstances, the inventors of the present invention have developed a method for manufacturing flux-cored shear wires by filling flux into a tubular wire, and have developed a method that allows uniform filling of flux. We have been conducting research to establish this. The present invention was completed as a result of such research, and involves running a metal wire in the longitudinal direction within a coating booth, and applying a powdery flux composition containing a powdery soft adhesive onto the outer surface of the wire. The gist is that after coating and then heating and baking the flux, it is inserted into a steel pipe and stretched.

The a release and effects of the present invention will be explained below based on drawings showing central 7s examples, but the following are representative examples and do not limit the present invention, and may be adapted to the spirit of the above and below. The electrostatic loading method, heat annealing conditions, etc. are changed excessively within the range. All of these are included within the technical scope of the present invention. 1st
The figure is a schematic process explanatory diagram showing an embodiment of the present invention.
M! Wire w-1 made of soft W4 or the like (generally made of tubular wire and laminate material to be described later) wound around v l. Drying bag @
Dry in Step 3 and send Shizuka to the mouth straight to 4. The adhesion of the flux F is prevented by the electro-dipping method or electrostatic spraying, which will be described in detail here. Flux F coated wire W-
2 is sent to a heating and baking device 5, where the flux F electrostatically attached to the car is fixed. A long tubular wire w-3 is prepared at the rear of the heating and firing device 5, and the wire W-1 protrudes from the tip of the flux-coated wire w-2 that has been fired or cooled as necessary.
By assigning Piano Section 6 and others to it and pulling it.

(Insert the coated wire W-2 into the tubular wire W-3. The longer the tubular wire W-3 is, the longer the coated wire W-2 can be inserted against the insertion resistance. In addition, in order to minimize the large resistance of the painted wire W-2, it is better to make the outer diameter of the coated wire W-2 slightly larger than the outer diameter of the tubular wire W-3. This can also be done by welding the joint of the piano fitting 6.The obtained flux-filled wire W-4 is then drawn to a predetermined size through drawing dies 7a and 7bi, and copper-plated if necessary. It is considered as a reward.

The principle of electrostatic charging is to charge the powder using a DC high voltage obtained by electrostatic generation, and make it adhere to the grounded object to be coated by electrostatic attraction. In carrying out the electrostatic coating in the present invention, the electrostatic dipping method and the electrostatic spraying method are employed, but these methods themselves are based on methods already practiced in the field of electrostatic coating of powder coatings. For example, in the case of the electrostatic dipping method, the capacity of the dipping tank, the material and shape of the bottom plate, the air feeding mechanism, the grounding method, the voltage, the wire supply mechanism, the gripping mechanism for the wire in the ground, etc. There is no particular limit to the charging of the flux powder.It can be either positive or negative, but for the sake of convenience and for the residual electrostatic voltage in the subsequent process, considering that m==, the wire is grounded and the flux is charged negatively. is preferable.

Regarding the electrostatic plasticization of flux, there are problems specific to each electrostatic coating method, so all of these will be explained below.

First of all, when implementing electrostatic spraying, there is little damage caused by differences in specific gravity in the flux composition, and while it has the advantage of being able to paint on feathers even if there is a slight difference in specific gravity; It may damage the uniform T device for a while, but if the sawing film is to be formed thickly, it may be necessary to use a product where the sawing film is tangential to the surface of the crashed object. Don't let the paint film thicken (
Since defects such as uneven loading and skewing are likely to occur, it may be necessary to use a rotating device for the metal wire, or it may be necessary to change the direction of the metal wire and load it in a pot. Since the electrostatic repulsion increases, it is recommended to raise the temperature of the plastic bag to prevent the same electrostatic pressure.

Next, in the static immersion method, the flux powder placed on a porous plate is blown up by pressurized air from below to form a primary fluidized bed of powder, and the flux powder is placed on the porous plate and the booth ceiling. If there is a d electric current between the electrode connected to the ground wire and the wire connected to the ground wire,
Since it is carried out by applying an electric current, if a wire is placed inside the charged floating powder, the specific yield will be uniform from the top, bottom, left and right, and I4
(It can be painted. However, if many component powders are blown up at once, there is a problem that the fluidized bed itself will vary due to the difference in specific gravity of each powder, causing variations in the flux composition between the top and bottom of the wire.) There is.

That is, when the wires are arranged horizontally, variations occur in the circumferential direction, and when the wires are arranged vertically, variations occur in the vertical direction. Therefore, it is recommended to divide the materials with a large difference in specific gravity into separate groups, change the direction of each group in separate painting booths, and paint them repeatedly.

The flux used in the present invention has the power of combining the adhesive powder as described below, which is melted during mfj PJ firing and functions as a binder. If a coating is to be carried out, the presence of each in each composition is necessary.

Therefore, it is recommended that the powder adhesive be mixed evenly with each of the raw material powders.

As a powder adhesive, a low melting point glass-based shielding agent is used.

Although there are inorganic polymer-based board 1 and organic molecular thread adhesives, phenolic resin, which is a carphone bond-based board adhesive, is difficult to use in terms of W contact strength and underside conditions.

The same black often contains conductive substances such as Fi back oxidation, silicates, fluorides, non-conductive substance ponds, and ferroalloys, but since conductive substances do not adhere electrostatically, these It is necessary to coat the surface with y3 offal during pretreatment before placement, Th, b.

In this case, the effect of killing two birds with one stone can be achieved by fully using the flux fixing crucible as an insulating material for surface coating.

As shown in Fig. 1, the paint booth 8 is equipped with water, and below the paint booth 8 there is a porous ceramic pupil 1fk, and the paint is placed at regular intervals on top of it. Electrodes 10 are arranged on the ceiling surface of the booth 8, and electrodes 10 are similarly arranged on the ceiling surface of the booth 8. These electrodes 10 are connected to a high voltage generator (not shown) and receive a negative voltage 71J. The other 11 is a wire w- running inside the booth.
This is a ground wire connected to electrode 10 and ground wire 1.
Forced electrolysis occurs at 1itJ of 1. Therefore, when air is blown from the air blowing fan 12 and the flux component placed on the ceramic & 9 is blown up to form a fluidized bed, the powder becomes negatively charged in the ionized air, and the ground wire W It is attached to the outer circumference of -1. When it is desired to increase the adhesion type of Hakuburax F, it is sufficient to apply heavy-duty coating.In this case, it is preferable to gradually increase the charging voltage, for example, from 16QKV% at the beginning to about 180KV at the final stage.

FIG. 2 is an explanatory diagram showing an example of painting by electrostatic spraying,
The wire W-1 is being electrostatically sprayed in the painting booth 8 while traveling in the direction penetrating the page.

The flux F is stored in the hopper 13, and the flux F is constant.
= Spray gun 15M by supply injector 14
The booth was opened on the 8th. 16 is a high voltage generator;
10 is the electrode, 11 is the grounding machine, and I am sorry for the flux F that is directed towards the wire W-1, but in this 1st case, the spray gun 1511 of the wire W-4 is used.
111, so either give the wire V/-1 a rotation in the twisting direction d, or arrange multiple spray guns around the wire w-1 to spray uniformly to the outer periphery. is recommended. 17! -! The flow path for flux return 4 is shown.

The stage that has been electrostatically plasticized in this way is sent to the infrared firing device Sumire, where the flux F fixed is inserted into the shape wire, and then the wire is drawn to the specified amazake. good. In this way, if it were uninvented, the method of attaching flux to the wire and then inserting it into the tubular wire would be adopted, so the optical filling of the flux would be uneven in the direction of the user (support). There is no risk of forming partial unfilled areas, and it is possible to damage the flux-cored wire of superior quality. Moreover, the flux is coated using electrostatic coating, without using any liquid binder such as water glass, and because the flux is filled into the tubular wire immediately after heating, it is easy to coat the flux. It can be filled with water, and the fact that there are no seams in the cloth outer shell means that its performance is extremely high.

Next, a non-inventive example will be shown.

Example 1 A Flaxian Siwire was built in Q according to the Manaku shown in Section 1 under the following conditions. In addition, fill with flux and make the specified size i (1,
After wire drawing to 2+, φ), the wire is then drawn to 1
The product was made into a product after being subjected to cleaning and cleaning to improve its electrical conductivity.

[Shrine fee and conditions for pampering]

Wire (W-1): Low #Jouji, 1.0 cod φ tubular wire (
W-3): Low furnace #Ko, Inner living 6.0 Simple φ Outer 10. Own
φ Flux resistance 7 lux (iron powder%Fe-:・In, Fe-5i%Fe-Ti,
CaF2, Tio2.5102, ZrO2: However, the surface is treated with phenol/I/resin in advance and blended) Powder leavening agent 4: Phenol resin Electrostatic coating conditions: vi, It60 KV Wawai running Ii
8 degrees 1 m/min firing process: 200°C x 30 minutes Flux thickness: 30 The obtained flux-cored wire has no seams on the outer skin, and the beak etc. have been completely removed, and the copper plating process has been increased. Because of this, both the feeding and current conductivity are excellent (very good), and the packing density of the flux is uniform and the dryness is also low, so it exhibits extremely good bath contact properties. was confirmed.

[Brief explanation of the drawing]

Figure 1 shows an example of the present invention.
The figure is an illustration of the electrostatic spray down method. 1...Spool 2...Rust removal/cursed purpose device 3
...Drying device 4...Electrostatic coating pupil 5...
1 heated firing bag 6... Piano section 7a, 7b...
Insertion die w-1...Wire W-2...Flux-coated wire w-3...Tubular wire w-4...Flux-filled wire Applicant: Kobe-Kami Co., Ltd. Agent Masu Danki Hisashi -2

Claims (1)

[Claims] (1) A metal wire is run in the longitudinal direction in a coating booth, and a powder flux composition containing a powder binder is electrostatically coated on the outer surface of the wire, and then the flux is heated and fired, and then A MA method for welding flux-cored wire, which is characterized by inserting it into a manufactured pipe and stretching it. (2. In claim 1, a powder or granule flux composition is used in which the surface of the conductive a-a substance contained in the powder or granule flux composition is subjected to insulation treatment, and the entire part is made of an insulating paJ substance. Method of manufacturing flux-cored wire.