JPS6233095A - Method for manufacturing composite wire using double tubes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] AND'' LJ The present invention provides a double tube containing flux powder and metal powder suitable for use in automatic and semi-automatic welding of mild steel, high-strength steel, low-alloy steel, etc. The present invention relates to a method of manufacturing a composite wire comprising:

Conventionally, one method for manufacturing composite wires such as the one described above is to fill the center hole of a seamless pipe with flux powder and/or metal powder, and then draw the wire. However, since the length of the composite wire used for automatic or semi-automatic welding is extremely long, filling the center hole of the pipe with flux powder and/or metal powder requires extremely complicated work. It was extremely difficult to uniformly fill the entire length of the long pipe with the filler consisting of these materials. Another method for manufacturing composite weir is to bend a long metal strip.
This is generally done by filling powder therein. That is, as shown in FIG. 2, a long metal band l(
The hoop (hereinafter referred to as hoop) is sequentially bent in the width direction, and after filling flux powder and/or metal powder 2 in the middle of the bending, the hoop 1 is formed into a tubular shape and used as an outer skin 5, which is drawn to a predetermined size. It was something that could be obtained. The shape of the bent end of the hoop of such a conventional composite wire is as shown in Fig. 3, in which both ends of the hoop 1 are simply butted together (A), and in which the ends are made into sloped surfaces and are butted together. (b), and partially overlapped ends (
C) etc. are adopted.

However, even with such an end configuration as shown in FIG. 3, when the resulting composite wire is drawn to a predetermined size,
The end portions spring back due to die processing by wire drawing or compression roll processing, and it is inevitable that there will be some gaps. If there are gaps in the outer skin of such a composite wire, the flux powder and/or metal powder contained therein, especially the flux powder component, which is extremely hygroscopic, will absorb moisture from the atmosphere through the gaps, and this will absorb moisture from the atmosphere. Hydrogen is introduced into the deposited metal welded using the composite wire, causing blowholes and hydrogen embrittlement, as well as significantly deteriorating impact resistance. In addition, the difference in strength due to uneven cross-sectional shape due to gaps causes wire warping, that is, a tendency to bend, which causes bead meandering during welding and misalignment of the welding target position, and increases resistance within the conduit tube. This method also has the problem of causing poor feeding, such as powder components falling off and clogging the feeding path.

Purpose The present invention solves the above-mentioned problems, prevents flux powder and/or metal powder from absorbing moisture, improves the soundness of weld metal, prevents wire curling, and improves feed during welding. The object of the present invention is to provide a composite wire that can secure supply properties and perform stable welding.

The method of manufacturing a composite wire using a double tube according to the present invention involves sequentially bending a long metal band (hoop) in the width direction, and filling fluff powder and/or metal powder in the middle of the bending. and then forming the hoop into a tubular shape to produce a composite wire;
After or without drawing the composite wire, separately prepared hoops are sequentially bent in the width direction, and during the bending, the composite wire is wrapped with an inner layer containing flux powder and/or metal powder. Consists of an outer layer,
A double tube is formed in which the joint positions of the inner and outer layers are shifted from each other, and then wire is drawn to a predetermined size.

As described above, the present invention is characterized in that the flux powder and/or the metal powder is contained in a double tube consisting of an inner layer and an outer layer in which a hoop is formed into a tubular shape, and the joint positions of the inner and outer layers are shifted from each other. It has the following. Here, what does it mean to shift the joint positions of the inner and outer layers from each other?

This means that the joint positions do not coincide with each other, and preferably these joint positions are located as far apart as possible, optimally by 1
In order to achieve the purpose of the present invention, it is desirable that the position be shifted by 80@.

FIG. 1 shows an example of manufacturing a composite wire using a double tube according to the present invention. In Fig. 1, a hoop 1 is sequentially bent in the width direction, and during the bending, flux powder and/or metal powder 2 is filled (a), and then the hoop 1 is made into a tubular shape (a) to obtain a composite wire. . This composite wire is then drawn to a predetermined size (c).
In parallel with this process, a separately prepared hoop 1' is sequentially bent into a U-shape in the width direction (d), and the previously formed composite wire is placed inside this bent hoop so that the joint part is on the lower side. Arrange the wires so that they are (e) and obtain a composite wire with double tubes (f). After that, the wire is drawn to the specified size, and the desired 2
Obtain composite wire (g) using heavy pipes.

Figure 1 above shows the process of drawing a single-ply pipe, that is, (b)
Although steps (c) to (c) have been carried out, this wire drawing step is not necessarily necessary if the width of the separately prepared hoop 1' is a predetermined width. In the thus obtained composite wire made of double tubes, the tube formed by the hoop 1 becomes the inner layer 3, and the tube formed by the hoop vinyl becomes the outer layer 4, and the joint of these inner and outer layers is at a position shifted by tao'. It turns out. In addition, the joint positions of these inner and outer layers do not match at least,
Although the intended purpose can be achieved if the position is slightly shifted, it is preferable that the position is shifted by 90' or more from the viewpoint of adhesion between the inner and outer layers. Furthermore, in order to eliminate line curls, it is preferable that the joint positions of the inner and outer layers are shifted by 90'' or more.

If the wire drawing process of the composite wire using the double tube in FIG.
First, drawing the reduced area shown in FIG. 1 during wire drawing to an area reduction rate of 40% using a roller die or pressure wire roller to bring the inner and outer layers into close contact brings about extremely favorable results in subsequent wire drawing.

Note that the thicknesses of the hoop 1 and the plate are set in advance so that the thickness of the inner and outer layers of the composite wire obtained in accordance with the amount of flux powder and/or metal powder 2 included falls within a predetermined range. It goes without saying that you should keep it. Further, the thicknesses of the hoops L and B do not need to be the same, and their hardness should also be considered depending on the wire drawing conditions. In addition, in order to improve the adhesion between the inner and outer layers, it is desirable to keep their contact surfaces clean, and it is also important to keep the gap between the joints as small as possible. This will help prevent this.

Examples are shown below.

Example A hoop 1 with a thickness of 0.7 m and a width of 17+*m is prepared, and the first
According to the process diagram shown in the figure, a composite wire with an outer diameter of 4.8 mmφ is formed by filling with flux powder and/or metal powder 2. The wire was drawn to Orsφ. This composite wire was wrapped using a hoop 1' having the same thickness and width to form a composite wire with a double tube of 811 Iaφ, and the wire was drawn to 1.2+a×φ to form a product. The resulting double-tube composite wire is coated with flux powder and/or
Alternatively, the metal powder (area ratio 25%) is contained in a substantially concentric circle without eccentricity, and an extremely good wire can be obtained.
When this was used for automatic welding, the weld bead did not meander and the feedability was stable.

Here, welded a composite wire made of a double tube obtained according to an example of the present invention and a composite wire made of a conventional single tube as a comparative example, and measured the amount of hydrogen contained in the weld metal according to the JI
A comparison was made using a diffusible hydrogen test according to S Z 3113. The results are shown in the table below. Note that the values in the table indicate the amount of hydrogen per long weld metal.

As a result of the above test, the inner layer and outer layer of the double-tube composite wire manufactured according to the present invention were in close contact with each other, and the joint positions of the inner and outer layers did not match, so there was almost no gap between the inside and outside of the wire. It can be seen that the powder component hardly absorbs moisture.

Juku-m=1 According to the present invention as described above, the outer skin is formed by a hoop, flux powder and/or metal powder is included in the outer skin, the outer skin is formed in two layers, and the inner and outer layers of the outer skin are Since the composite tube is formed and wire drawn by shifting the position of the joint, there are almost no gaps between the inside and outside of the composite wire, thus ensuring the moisture resistance of the powder component and preventing deterioration of the wire due to long-term storage. 1. A double-pipe composite wire that can easily form welded metal with high mechanical strength by semi-automatic or fully automatic welding is provided, and its significance is extremely significant in this industry.

[Brief explanation of drawings]

FIG. 1 is a process explanatory diagram showing an example of manufacturing a composite wire using a double tube according to the present invention. FIG. 2 is a process explanatory diagram showing an example of manufacturing a composite wire by a conventional method. FIG. 3 is an explanatory view showing the aspect of the joint when the outer skin is formed by a hoop. 1.1'... Hoop 2... Flux powder and/or metal powder 3...
・Inner layer 4...Outer layer 5...Outer skin

Claims (1)

[Claims] 1. After sequentially bending a long metal strip in the width direction and filling the middle of the bending with flux powder and/or metal powder, the metal strip is formed into a tubular shape to form a composite wire. and after or without drawing the composite wire,
A separately prepared long metal band is sequentially bent in the width direction, and during the bending, the composite wire is wrapped around the inner layer and the outer layer containing flux powder and/or metal powder, and the joint position of the inner and outer layers is A method for manufacturing a composite wire using a double tube, which comprises forming a double tube with the double tubes offset from each other, and then drawing the wire to a predetermined size. 2. The method for manufacturing a composite wire using a double tube according to claim 1, wherein the positions of the inner and outer joints of the double tube are shifted by 180°.