JPS61216896A - Production of powder-cored welding wire - Google Patents

Abstract

PURPOSE:To improve the quality characteristics of a wire by sealing hermetically the joint of a metallic pipe then coating a metal on the surface and drawing the metallic pipe. CONSTITUTION:A long-sized metallic belt 11 is successively bent in the transverse direction to form the metallic pipe 12. Powder 13 consisting of flux powder and metallic powder is packed into the pipe 12 during the formation and a closing material 15 such as an adhesive agent is filled in the joint part 14 thereof, then the joint part is hermetically closed. The pipe 12 is subjected to copper electroplating to form a metallic film 16 thereon. The pipe 12 is thereafter drawn and the powder-cored welding wire 17 having a prescribed outside diameter is obtd. The intrusion of moisture and air into the wire 17 is obviated by the above-mentioned method, by which an excellent shelf life is obtd. and the long-term preservation is made possible. Since the wire has the metallic coating 16, the quality characteristics such as electricity conductability and rust resistance are improved.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a powder-filled welding wire rod suitable for use in arc welding, in which semi-automatic welding and automatic welding are easily possible. The present invention relates to a method for manufacturing a powder-filled welding wire rod used in, in particular, a method for manufacturing a powder-filled welding wire rod used as a 7-lux cored wire used in CO2 gas arc welding and non-gas arc welding.

(Conventional technology) Conventionally, this kind of powder-filled welding wire rod.

For example, there are the ones shown in FIGS. 1 to 4. Among these, the powder-filled welding wire rod 1 shown in FIG. This is what happens. In this case, a gap remains formed at the joint 4 at the bent end of the metal tube 2.

The welding wire 1 shown in FIG. 2 is made by filling a flux powder 3 into a metal tube 2 formed by overlapping the bent ends of metal strips.

Furthermore, the welding wire rod 1 shown in FIG. A joint portion 4 at the bent end of No. 2 is welded at a weld portion 5.

Furthermore, the welding wire 1 shown in FIG. 4 is produced by winding a metal tube 2 preformed by extrusion molding or the like onto a spool, placing the spool on a vibrating table, and applying flux powder from the end while vibrating the metal tube 2. 3.

(Problems to be Solved by the Invention) However, in the powder-filled welding wire 1 shown in FIG. , has the disadvantage that the storage property of the welding wire 1 is not very good, and
This has the disadvantage that the hydrogen content in the weld metal increases, making it more likely to cause cracks.Furthermore, when the welding wire 1 is wound onto a spool or the like, the joint 4 opens wider and the flux powder 3 leaks. It had drawbacks.

Further, in the welding wire 1 shown in FIG. 2, the intrusion of air and moisture from the joint portion can be reduced compared to the one in FIG. 1, and leakage of the flux powder 3 can be prevented. This method has disadvantages such as poor wire drawability when forming a welding wire 1 of a predetermined diameter by subsequent wire drawing, and poor feeding performance of the welding wire 1 during welding.

In the welded wire rod 1 shown in FIGS. 1 and 2, even if copper plating is applied to the surface to improve its electrical conductivity and rust resistance, the plating solution is not applied because the plating solution penetrates into the interior through the joint. It had the disadvantage that it could not be done.

Furthermore, in the welding wire 1 shown in FIG. 3, it is possible to prevent air, moisture, etc. from entering the inside and deteriorating the characteristics of the flux powder 3, and at the same time, it is possible to prevent the flux powder 3 from leaking. Since it is also possible to perform copper plating on the surface, it is possible to improve the drawability of the welding wire 1, the wire feedability during welding, and the conductivity. However, in such a welding wire 1, when welding the bent end, the flux powder 3 or metal powder melts and solidifies or gasifies due to the welding heat, reducing the properties of the welding wire 1, and then This had the disadvantage that it could have an adverse effect on welding.

Furthermore, the welding wire rod 1 shown in Fig. 4 can prevent air and moisture from entering and leakage of the flux powder 3, and the surface can be coated with copper, which improves wire drawability during welding. Although it is possible to improve the wire feedability and conductivity, the flux powder 3
It is not suitable for continuous work because it is necessary to wind up the metal tube 2 onto a spool once to fill the flux powder 3. Also, it is necessary to smoothly vent the gas inside the metal tube 2 when filling the flux powder 3. However, when there is a difference in specific gravity or particle size between the metal powder or metal powder, the powder having a large specific gravity or particle size and the powder having a small particle size gradually separate and cannot be filled uniformly.

This invention was made in order to eliminate the drawbacks of the prior art described above, and it is possible to prevent deterioration of the characteristics of powder such as flux powder because air and moisture do not enter inside, and also to prevent the deterioration of the properties of powder such as flux powder. It has excellent rust resistance, and therefore has excellent storage stability and can be stored for a long time. It also prevents powders such as flux powder from leaking, and improves wire drawability when drawing wire. In addition to being excellent, wire feedability and current conductivity during welding are also extremely good.
When welding the joint part of the bent end as in the case of the welding wire rod shown in Fig. 3, there is no adverse effect such as melting solidification or gasification on powder such as flux powder, and It is an object of the present invention to provide a method for manufacturing a powder-filled welding wire rod, which makes it possible to manufacture a powder-filled welding wire rod without the problem of non-uniform filling of flux powder as in the case of the welding wire rod shown in the figure.

Arrangement 1 of the Invention (Means for Solving Problems) This invention forms a metal tube by sequentially bending a long metal strip in the width direction, and injects flux powder and/or into the metal tube.
Alternatively, when manufacturing a powder-filled welded wire by filling metal powder, the joints of the metal tubes are sealed with a sealing material such as an adhesive, a filler, or a brazing material, and then a metal coating is applied to the surface of the metal tube. , and then wire drawing is performed as appropriate.

The material of the metal strip used in this invention is not particularly limited, and the powder is not particularly limited, such as flux powder alone, metal powder alone, or a mixture of both powders, and the material of the object to be welded and welding conditions This is determined as appropriate. In addition, adhesives, fillers, brazing materials, etc. are used as sealing materials for sealing the joints of metal pipes.More specifically, resin-based adhesives and fillers such as epoxy and anaerobic resins, Alternatively, a brazing material such as copper brazing or aluminum brazing is used.

Further, after the joint portion of the metal tube is sealed, a metal coating is applied to the surface of the metal tube. In this case, the metal coating can be formed by electroplating, hot-dip plating, etc., but is not particularly limited.

Although it is possible to coat the surface of the metal tube with metal and use it as a welding wire as it is, it is also possible to draw the wire appropriately after that to make a powder-filled welding wire with a predetermined outer diameter.

FIG. 5 is a view showing one embodiment of the present invention, in which a long metal band 11 is sequentially bent in the width direction to form a metal tube 12, and during this forming, the interior of the metal tube 12 is is filled with a powder 13 made of flux powder and/or metal powder, and the joint part 14 of the metal tube 12 is filled with an epoxy resin adhesive as a sealing material 15, thereby sealing the joint part 14. Next, the metal tube 12 is subjected to electrolytic copper plating to form a metal sheath m16, and then drawn and formed into a powder-filled molten t1i wire 17 having a predetermined outer diameter.

FIG. 6 is a diagram showing another embodiment of the present invention, in which a long metal band 11 is sequentially bent in the width direction to form a metal tube 12.
During this molding, the metal tube 12 is filled with powder 13 made of flux powder and/or metal powder, and aluminum solder is used as a sealing material 15 at the joint 14 of the metal tube 12. By filling and joining, the joint 14 is sealed, and then the metal tube 12 is plated with hot-dip aluminum to form the first metal coating 18 made of aluminum, and then electroplated with copper to form the first metal coating 18 made of aluminum. A second metal coating] 9 is formed, and then wire-drawn to form a powder-filled welding wire 17 of a predetermined outer diameter.

In the welded wire rod 17 manufactured in this way, the joint portion 14
Since it is closed, air, moisture, etc. cannot enter inside, and therefore it is possible to prevent deterioration of the properties of flux powder and metal powder, and it has excellent storage properties and can be stored for a long time. . In addition, since it does not absorb moisture, the hydrogen content in the weld metal does not increase, and therefore cracking due to an increase in hydrogen content can be prevented. Furthermore, since the surface is coated with a metal coating (m16, 18.19), it has excellent wire drawability during wire drawing, and has excellent wire feedability and current conductivity during welding, and is rust resistant. It becomes a powder-filled welding wire rod with excellent properties.

Further, as shown in FIG. 6, a first metal coating 18 made of aluminum having a low melting point and a second metal coating 1 made of copper
By applying the double metal coating No. 9, it becomes possible to make the metal coating extremely high in stoneability.

(Example 1) In this Example 1, a powder-filled welding wire 17 was manufactured according to the steps shown in FIG. At this time, the metal band 11
With dimensions of 38 mm width and 2 mm thickness, C: 0
．． 06% by weight, Mn: 1.00% by weight, Si: 0.20
Weight%, P: 0.015% by weight, S: 0.010% by weight
, the balance being Fe, and as the powder 13, a ferroalloy powder such as medium carbon ferromanganese and a nonmetallic powder such as rutile were used. Then, the metal tube 12 is formed by sequentially bending the metal strip 11 in the width direction, and during this forming, the powder 13 is filled into the metal tube 12.
2, the joint 14 of the tube 12 is filled with an epoxy resin adhesive as a closing material 15, and then the metal tube 12 is electrolytically plated with copper to form a metal coating 16. After that, the metal tube 12 is drawn to have a diameter of 1. The powder-filled welding wire rod 17 was 2 mm thick.

(Example 2) In this Example 2, a powder-filled welding wire 17 was manufactured according to the steps shown in FIG. At this time, the metal band 11
As powder 13, the same powder as in Example 1 was used. Then, the metal strip 11 is sequentially bent in the width direction to form the metal tube 1.
2, and during this molding, the powder 13 is passed through the metal tube 12.
Next, the joint part 14 of the metal tube 12 is filled with aluminum solder as the closing material 15 and joined together, and then the metal tube 12 is subjected to hot-dip aluminum plating to form the first metal coating 18. Then, electrolytic copper plating was performed to form a second metal coating 19, and the wire was drawn to form a powder-filled welding wire 17 having a diameter of 1.2 mm.

(Comparative Example) In this comparative example, a welding wire 1 having the cross-sectional shape shown in FIG. 1 was manufactured. At this time, the same metal strip 2 and powder 3 as in Example 1 were used. And metal band 1
1 is sequentially bent in the width direction to form a metal tube 12, and during this forming, the powder 3 is filled into the metal tube 2.
The wire was drawn to obtain a powder-filled welding wire 1 having a diameter of 1.2 mm.

(Evaluation example) Next, using the powder-filled welding wire rods 1 and 17 manufactured in each of the above-mentioned Examples 1.2 and Comparative Examples, the welding current was 300.
A. Welding was performed under the conditions of an arc voltage of 32 V and a welding speed of 30 cm/min.

Then, during this welding, the feeding resistance of the welding wire 1°17 was measured using a load cell, and the electrical conductivity was evaluated. Furthermore, the mechanical properties of the deposited metal after welding were evaluated. These results are shown in the following table, and the results of examining the wire drawability during manufacturing are also shown.

As shown in the table above, the welding wire rod 17 according to the present invention has significantly better wire drawability during manufacture than the conventional welding wire rod 1, has considerably lower feeding resistance during welding, and has better electrical conductivity. It is clear that it is superior. Furthermore, since there is no intrusion of air, moisture, etc. into the interior, the mechanical properties of the welded metal can be significantly improved.

[Effects of the Invention] As described above, according to the present invention, a long metal strip is sequentially bent in the width direction to form a metal tube, and flux powder and/or metal powder is added into the metal tube. When manufacturing a powder-filled welding wire by filling the metal tube with the metal tube, the joint of the metal tube is sealed with a sealing material such as an adhesive, a filler, or a brazing material, and then a metal coating is applied to the surface of the metal tube, and then as appropriate. Since wire drawing is performed, there is almost no deterioration of the powder even during long-term storage, and the surface rust resistance is also extremely good, making it possible to obtain powder-filled welding wire with good storage stability. . Furthermore, it has excellent wire drawability during wire drawing, as well as extremely good wire feedability and electrical conductivity during welding, making it possible to form weld metal with high mechanical strength by semi-automatic or fully automatic welding. A very good effect is brought about that is possible.

[Brief explanation of the drawing]

1, 2, 3 and 4 are explanatory diagrams showing the cross-sectional shapes of conventional powder-filled welding wire rods, and FIGS. 5 and 6 are illustrations of powder-filled welding wire rods according to each embodiment of the present invention. FIG. 3 is an explanatory diagram showing the manufacturing process. DESCRIPTION OF SYMBOLS 11... Metal band, 12... Metal tube, 13... Powder, 14... Joint part, 15... Closure material, 16.18.19... Metal coating, 17... Powder Core welded wire rod. Patent applicant Daido Steel Co., Ltd. Representative Patent Attorney Yutaka Oshio Figure 5 Figure 6

Claims (1)

[Claims] (1) When manufacturing a powder-filled welding wire rod by sequentially bending a long metal strip in the width direction to form a metal tube and filling the metal tube with flux powder and/or metal powder, the metal Production of a powder-filled welding wire rod, characterized in that after the joint of the pipe is sealed with a sealing material such as an adhesive, a filler, or a brazing material, a metal coating is applied to the surface of the metal pipe, and then appropriate wire drawing is performed. Method.