JPS6040692A - Production of flux cored wire for welding - Google Patents

Abstract

PURPOSE:To obtain a wire which prevents the seam of the wire from opening and permits copper plating on the surface by repeating the operation for dropping and filling a flux into a steel pipe inclined to a specific angle and welding said pipe to a fresh steel pipe then performing the above-mentiond filling. CONSTITUTION:A flux 10 is charged into plural hollow steel pipes 1 which are fixed by means of jigs 2 to the angle of repose of the flux or above, for example, perpendicularly, in the filling position while the flow rate is adjusted with the valve 4 of a supply pipe 5 via a hopper 3. The pipes 1 are vibrated by a vibrating machine 9 to fill uniformly the flux 10 into the pipes. The valve 4 is closed when the distance l from the top surface thereof and the top end of the pipe 1 attains a prescribed length. The top end of the pipe 1 and the bottom end of the fresh pipe 1' are then welded 14. The distance l at which no adverse influence is given to the flux filled in the pipe is taken in this stage. When the filling of the flux into the pipe 1 ends, the pipe 1 is wound on a winding bobbin 13 and the above-mentioned welding and filling are repeated. The flux filled steel pipe is reduced to a desired diameter by which a product is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Object of the Invention) The present invention relates to a method for manufacturing a Franckne wire for automatic/semi-automatic welding.

(Prior Art) In general, a welding franked wire is a composite of a copper strip formed into a certain cross-sectional shape and filled with granular flux consisting of a deoxidizing element, a slag forming agent, etc.

This welding wire is used in a wide range of applications, from mild steel to low-alloy and high-alloy steel welding.

The conventional manufacturing method for franked wire is to form a thin steel plate into a U-shape, then uniformly fill it with granular welding flux whose composition has been adjusted in a specified manner, form it into a specified cross-sectional shape, and then stretch it. It is used for wire processing. Wires produced in this way have various drawbacks.

In other words, when manufacturing a wire to be flanked or making it into a product, the joints tend to open, which hinders wire manufacturing. If organic substances enter the Franx and weld using it, it may increase diffusible hydrogen in the weld metal or promote oxidation of the metal strip surface on the inner surface of the wire, increasing oxygen in the weld metal. , deteriorating the mechanical performance of the deposited metal. In addition, for Solirad wire for welding, copper plating is applied to the wire surface for the purpose of preventing rust on the wire surface and improving conductivity during welding. Not applicable. The reason for this is that the copper plating process is a wet method in which the object to be plated (wire) is immersed in a plating bath and plating is applied, which causes the inconvenience that the plating solution infiltrates into the wire through the seams.

As a method to overcome this drawback, it has been proposed to weld and join the joints of the cladding tubes in parallel with the filling of flux. For example, in Japanese Patent Application Laid-open No. 54-109040, a copper strip is formed into an open groove, and flux powder is dropped and supplied into the groove to an extent that does not fully fill the inside of the pipe during the next pipe making welding, and then the groove is filled with a copper strip. A method of manufacturing by continuously forming a sealed tube by closing the edges together and welding the longitudinal connections, and reducing the dimensions of the tube so that the flux powder is tightly packed inside the tube. It is shown. In this method, the flux is configured so that it occupies only a part of the pipe instead of the entire pipe during welding, because if the welding position is too close to the flank position, they will have a negative effect on each other. This is to prevent excessive heat from reaching the flux. That is, when welding the edge of a groove in a copper strip, there is a risk that the heat generated by welding will change the composition of the flux or make it unsuitable, and that the flux may become swirled by the magnetic field that is present due to welding. The reason is that it may adhere to the contact surface of the edge of the groove and weaken the weld, but this problem is not recognized to have been sufficiently solved by the above manufacturing method, and the weld and 7Ranks are not mutually compatible. were forced to have a negative impact on each other. According to the above manufacturing method, since the amount of flux supplied is limited, the flux filling rate of the product is inevitably limited to a low level, which is also a disadvantage.

Furthermore, in the tube size reduction process after welding, the entire tube is filled with flux, the air inside the tube is removed, and the flux is tightly packed to prevent the flux from moving in the longitudinal direction of the tube, but at this time, variations in the flux filling rate tend to occur. There is a problem.

(Objective of the invention) The present invention aims to solve all the problems of the conventional art as described above.
In other words, one of the objects is to provide a method for manufacturing a welding franked wire that does not open the joints of the wire during manufacturing or in the product, and can be subjected to plating treatment such as copper plating, and further improves production efficiency. An important object of the present invention is to provide a manufacturing method capable of manufacturing a welding flux-cored wire with good product quality.

(Constitution of the Invention) The gist of the present invention to achieve this object is to place a hollow steel pipe at a flux filling position with an inclination greater than the angle of repose of the flux, and to apply flux to the steel pipe through the upper end hole of a steel vibrator. A 7-six filled steel pipe is obtained by repeating the operation of dropping flux from the hollow steel pipe to fill it, welding the steel pipe and a new hollow copper pipe, and then supplying flux again into the hollow steel pipe several times. create,
The purpose is to reduce the diameter of the flux-filled steel pipe to a desired diameter.

The contents of the present invention will be explained in detail below based on specific examples.

8i! Figure 1 (Al is a sectional view showing a specific example of the process of filling flux into a hollow steel pipe. As shown in the figure, a steel vibrator 1 of a fixed length straight pipe is attached to a plurality of fixing jigs 2 at the flux filling position. The upper end hole of the steel pipe is connected to a small-capacity flux spotper 3 that receives flux powder sent from a large-capacity tank (not shown), and is equipped with a flux flow rate adjustment valve. 4 is inserted into the tip of the flux supply pipe 5.The lower end of the steel pipe 1 is plugged with a clip 6 on one side and a closed vinyl port 7 with a fixture 8, and is plugged from the upper end hole of the steel pipe I. The supplied flux is prevented from spilling.Also, the steel pipe is vibrated by one or more vibrators 9 at the same time as the flux is input from the flux pumper 3, and the flux 1.0 is uniformly distributed in the steel pipe 1. I try to fill it with precipitate density.

In this way, the 2 lux in the Frank Spora rubber 3 is supplied falling into the steel pipe via the flux supply pipe 5.
As the supply filling progresses, as shown in Figure 1 (bl), the steel pipe 1
When the distance l between the upper end of the flux 10 inside reaches a predetermined length, the flank flow rate adjustment valve 4 is closed to stop the supply of flux. This distance l is important because when welding together the upper end of a steel pipe that has been filled with flux and the lower end of a new hollow steel pipe (Fig. 2 (bl)), the welding work and the filled flux (top surface) have a negative effect on each other. It is desirable that the distance be at least as large as the inner diameter of the steel pipe, preferably several times the inner diameter.Flux 10
The position of the upper surface is detected by a flux upper surface detection device 11 using ultrasonic waves, etc., and this is foot banked to the flux flow rate adjusting pulp 4, and when the position is a predetermined distance l from the upper end of the steel pipe, flux supply is started. I'm trying to stop it.

When the flux filling into the steel pipe 1 is completed, as shown in FIG. Then, place the new hollow steel pipe 1' in the flux filling position, and connect the upper end of the flux-filled steel pipe 1' with the hollow steel pipe 1'.
'The lower end is welded together, for example by TIG welding. The steel vibrator 1 is transferred by unfixing with a fixing jig 2, and being transferred while being held by transfer rollers (not shown).After being transferred, it is fixed again with a fixing jig 12, and then transported in an upright position and fixed at a flux filling position. It is welded and joined to a new hollow steel pipe fixed with jig 2.

During this time, the flux supply device (31 41 5) is lifted upward as shown in the figure and is in a standby state. Figure 2 (b
1 is an enlarged view of the joint between the steel vibrators 1 and 1', and 114 indicates a welded portion. After the steel vibrators 1 and 1' are joined in this way, the flux supply device (3) is installed.

4, 5) are lowered again, the flux supply pipe 5 is inserted into the upper end hole of the steel pipe 1', the flux flow rate adjustment valve 4 is opened, the vibrator 9 is turned on to vibrate the steel pipe 1', and the flux is supplied falling. Start and fill the steel pipe 1' with flux as in the case of the steel vibrator 1. Thereafter, this operation is repeated until the desired weight is achieved to produce a flux-filled steel pipe.

The flux-filled steel pipe thus obtained is then
The diameter is reduced to a desired diameter using a drawing die or roll rolling. During this process, annealing, plating, etc. are performed as necessary to obtain a welding franks-cored wire as a product.

In the plating process, copper plating is mainly applied to the steel vibrator for the purpose of preventing rust on its surface and improving conductivity during welding, but this point is similar to that of solid wire for welding.
As mentioned above, plating cannot be performed with wires having conventional seams. Also, plating treatment is not limited to copper plating, but also other Mn+ Zn+ Ti+ Al+ Ni+
It goes without saying that single metal plating of Cr+Sn, Sn+Cu alloy plating, double plating of Ni and Cr, etc. may be applied to the extent that the properties of the weld metal are not impaired.

In the present invention, the steel pipe to be used for flux filling may be either a welded pipe such as an electric resistance welded pipe in which a copper strip is formed into a cylindrical shape and the joints are welded, or a seamless pipe that does not have a welded joint. , to be selected depending on the situation. The length of the pipe is, for example, 5 to 20 m.

Also, there are various ways to weld steel pipes together, such as butt resistance welding and TIG welding, but if the back bead of the weld part protrudes too much on the inner surface of the pipe, it will impede the supply and filling of flux, so TIG welding is used in which the bead does not protrude too much. It is preferable.

In the above specific example, the steel pipe was erected vertically to supply and fill the flux, but the steel pipe is not limited to this, and the steel pipe may be inclined at an angle at least equal to or greater than the angle of repose of the flowing flux, and the same effect as above can be obtained. get. Further, although powdered flux was used to be supplied and filled into the steel vibrator, pelletized flux may also be used. This pellet-like flux is mixed in a predetermined ratio using a flux supply pipe, then mixed with a binder such as water glass for an appropriate time in a friend mill, and then extruded through a nozzle hole with a press. Obtain by shaping and drying.

In the above-mentioned specific example, the material was wound around a steel piefla bobbin which had been filled with flux, but it may also be coiled using a coiler and laminated.

(Example) Based on the specific example of the present invention shown in Fig. 1, 5, and 2, CO2
A franks fire for O2 cass arc welding was manufactured.

Steel vibrator: outer diameter 25.4 mm, wall thickness 50 mm, pipe length 5
．． 5m Filling flux: The main components are rutile + 51-Mn + iron powder.

Joining of steel pipes: 20 steel pipes were joined by TIG welding to form a Franks-filled steel pipe with a total length of 110 m. Distance 13 = 30 van Product wire: wire diameter 1.5 Tnm + surface copper plating As a result, production was possible with good production efficiency, and the resulting welding franked wire was of good quality.

That is, when welding was performed using this product wire, both the shine feedability and welding workability were good, the amount of diffusible hydrogen in the weld metal was low, and the mechanical properties were extremely good.

(Effects of the Invention) The effects of the franked wire for welding of the present invention are summarized as follows.

■ Welding of the same steel vibrator can be performed at a location optically separated from the filling flux, so welding work and flux do not adversely affect each other.

■ The outside diameter and wall thickness of the pipe when filling with flux, as well as the amount of flux supplied in the case of pelletized flux, can be selected at will, allowing for a wider range of filling rate designs than with conventional manufacturing methods. Moreover, there is no variation in the filling rate.

■ Since the flux filling into the steel pipe and the joining of the steel pipes are carried out separately, each can be carried out in the optimum conditions without interfering with each other, resulting in extremely efficient and high productivity.

■ Since there are no openings in the longitudinal direction of the steel vibrator, the internal flux does not deteriorate during manufacturing or due to factors such as moisture or lubricant entering from the outside of the product, and product quality as designed can always be obtained. It is also possible to perform plating or other surface treatments on the wire surface.

[Brief explanation of drawings]

Figure 1 (al is a cross-sectional view showing a specific example of the 7-six filling process in an unexploded BAK, and the same figure (bl is a partial view showing a state in which the filling has progressed). This is an explanatory diagram showing the process of joining the steel pipes together. (BL is a partially enlarged view of the same figure.) ■, 1' Steel pipes, 2, 12, Fixing jig, 3...
・Franksposoper, 4... Pulp, 5... Flux supply pipe, 6... Clip, 7... Vinyl hose, 8... Fixture, 9... Vibrator, 10... Flux, 11...Top surface detection device. 13... Winding bobbin 14... Welding department agent Patent attorney Ya Fukitomo (1 person) Figure 1 (a) (1)) Figure 2 (a)

Claims (1)

[Claims] Place a hollow steel pipe at the flux filling position with an angle of repose greater than the angle of repose of the flux, fill the steel vibrator with 7 sixes by dropping it from the upper end hole of the steel pipe, and then connect the steel pipe to a new hollow steel pipe. A flux-filled steel pipe is made by repeating the operation of welding and joining pipes 7 and again dropping and filling 7s into the hollow steel pipe several times, and reducing the diameter of the flux-filled steel pipe to a desired diameter. A method for producing a welding franked wire, characterized by: