JPS5930473A - Arc welding method - Google Patents

Abstract

PURPOSE:To execute arc welding with high performance, with high efficiency and at a low cost, by making a powder-particle-like flux adhere to th outside circumference of a welding wire by electrostatic attraction, supplying it to an arc generating part, and executing the welding. CONSTITUTION:A welding wire 1 is fed continuously in the direction of a base metal 3 through a guide 4 and an electrifying chip 5, also a flux F is supplied into a collecting box 6 by carrier gas from a feed pipe 8, and arc welding is executed. The flux F supplied to the collecting box 6 is impressed electrostatically by an electrostaic impressing part 10, and is collected in the lower part of the box 6 successively. There is a potential difference between the wire 1 passing through this box and the base metal 3, therefore, the flux F adheres almost uniformly to the outside circumference of the wire 1 by static electricity, and is supplied continuously together with the wire 1 in the direction of the base metal 3. In this way, gas is generated by welding heat of the flux F, also a slag is generated, and welding being same as a covered electrode is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an arc welding method, and in particular to arc welding using solid wire, by taking advantage of the characteristics of a covered arc m welding rod, and improving the vague welding workability, jointability, and performance. It's about how you can get it.

In covered arc welding, a covered arc welding rod is used, the outer periphery of which is coated with a flux containing a deoxidizing agent, an arc stabilizer, and a gas generator.

When welding was carried out in a thick weld, consideration was given to ensuring a good weld due to the shielding effect of the generated gas and the surface protection effect of the generated slag. However, as the Fi# required to improve welding efficiency increases, coated arc welding is less frequently used, and instead, semi-automatic welding, which is performed while continuously feeding a solid wire, seems to be the mainstream. In this case, it is necessary to completely cut the arc generating part from the atmosphere, and welding is performed by damaging the arc generating part with powdered flux. In addition to improving the coated arc welding rod itself, and improving the flux action on the +1+1 close contact rod, various methods have been proposed.

One is the gas-shielded arc/i-metal welding method based on the idea of i' IG welding, which supplies carbon dioxide gas, argon gas, etc. to the arc
However, with this method, the arc generation area and molten metal are shielded only by gas, so they are easily affected by the effects of wind, and slag that protects the molten metal is not generated, as is the case with damaged arc welding rods. However, there is a problem with the bead shape 4k and the bead surface m1 is deteriorated by oxidation.On the other hand, another method is to use a so-called composite wire filled with the above-mentioned flux inside the double wire. However, in this method, the outer circumference +
Since metal is coming out at +111, it is not possible to sufficiently shield the arc generation part, molten metal, and shaft metal from the metal, and the performance of the welded part is poor. For this reason, it is necessary to supply a shielding gas (supplying shielding gas to the arc generating area, so-called futakushishielding gas 1) [Although the usage is even adopted, it is still the same as the welded part obtained with a coated arc welding rod. 15
Achieving a performance of first class or higher is a matter of determination. 1 Moreover, the 1pν method for composite wires is much more complicated than for solid wires, and there is also the problem that the cost increases significantly. Additionally, U.S. Patent No. 2.82 (1,187
No., TV No. 2.805,828, No. 2.929
．． No. 910, etc., a method has also been proposed in which a solid wire feed culm is used to attach heavy powder to the outer periphery of the solid wire by electromagnetic force and to supply it to the arc generating part. Approximately 17 objects that can be attached using this method are limited to magnetic metals 15 minutes, so
The use of 11 minutes can only adjust the composition of the weld metal + btl, and it is expected that the same effect (especially shielding effect and molten silk 1 metal protection effect) as the above-mentioned higher force υ wall flux can be expected. Nor.

The inventor of the present invention aimed at achieving 111 VCH, and attempted to provide an arc welding method that can simultaneously satisfy welding performance comparable to coated arc welding rods and high efficiency and low cost welding comparable to welding wires. Sharp, 0, has valued research 1,
The present invention was developed as a result of extensive research, and
Its composition is welding wire.

When performing arc welding while continuously supplying
The gist lies in that powdery flux is applied to the outer periphery of the welding wire by electrostatic attraction and then supplied to the arc generating part.

The powder containing gas generating agent, swab-type NLZ agent, arc stabilizer, etc.'r-shaped flux has almost no magnetic property; So,
It is impossible for the welding wire to adhere to the surface of the welding wire due to the electromagnetic force disclosed in the above-mentioned US 1-Jil Specification.

+:j: I'u tL, -r, and electrostatic -℃
Place the outside of the welding wire) on All MII 1
If the powder flux (rJ-Solution 7!--attractive force is applied to the outer periphery of the wire),
481 pieces with uniform thickness. The present invention effectively utilizes such knowledge as a means for achieving the object of the present invention, and the configuration and effects of the present invention will be specifically explained below using the same song that shows one example, but the figures are representative. This is an example and does not limit the present invention, and the specific structure of the welding torch, the welding wire feeding mechanism, the charging method and supply method of the powder flux, etc. may be changed as appropriate. Te'5
1. Everything that is done today is within the technical scope of the present invention.

Fig. 1 shows the W male side of the present invention. The wire is stored as an IIM in a container or semi-lit as a spool and two coils of wire, and is continuously fed by an appropriate feeding mechanism. The retention box 6 is not disposed, and a passage hole 7 is provided at its lower end to allow the passage of the wire 1 and to form an appropriate gap between the wire 1 and the outer periphery of the wire 1, and a flux supply hole 7 is provided at an appropriate upper position. A tube 8 is connected to the tube 8, and an electrostatic voltage applying section 10 is provided at a suitable intermediate portion thereof.
(The lower wall of the Tux 6 has a porous wall 9 all around or partially.
As will be described later, the carrier gas for flux feeding is made to flow out of the retention box 6 one after another. When carrying out the arc welding method of the present invention using this
: Continuously feed the welding wire in the direction of the base metal 8 through the wire guide 4 and the current-carrying tip 5 according to the conventional method, and at the same time send the sif wax F into the retention box 6 from the supply pipe 8 using a carrier gas such as nitrogen or air. Perform arc welding using the supplied force.

Retention box 6 inside-1 supplied flux F l-J
:Ze static electricity, [・11 Static electricity is applied in the first culm passing through the addition part 10, and it stays below the IIIF primary box 6. Since there is a difference of 7 points in the wire being fed,
The flux F, which has been added to the welding torch 2, adheres to the outer periphery of the wire with a substantially uniform thickness due to electrostatic attraction, and is continuously supplied together with the wire in the direction of the base material B. Therefore, the flux F is applied to the welding torch 2. The wire sent out from the shield has a shape coated with flux F on its outer periphery, similar to a coated arc welding rod. The effect and molten metal axis retention effect can be improved to the same level as that of a broken arc welding frame.Furthermore, with conventional coated arc welding rods, the amount of water (A) used in the flux kneading and coating process (used in the flux kneading and coating process) is It has been pointed out that this method can be used to repair welding defects such as cracks in the welding bath, but in the wood ID Ming, a flux F of 1 dry 4A' was applied to the upper suspension 1 with an electrostatic amount. Since it is a method of folding 1 layer by 1 force, it is difficult to avoid water contamination due to water contamination.
1.41; No welding defects occur at all. What's more, the ingredient composition of Flux F is different from that of powdered 11+! You can adjust the MRIL for the club by just doing this.
Applicable/-+f material type and 1 to 〒Fuwax group I according to shape, etc.; ρ i11! , since the answer is 1, it is dry, so the n ￥ shooting and A fee's 舒i beat is 111/^ shi? - At least 3), and the material's frightening effect can also be improved. (As mentioned above, the components that make up JF Wax F mainly include gas generating agents, swab generating agents, arc stabilizers, etc.)
The heating time is 12 minutes, but iron powder, alloy powder, etc. may be added if necessary. However, when magnetic metal powder such as iron powder is used in combination, the amount thereof should be kept to about 80% by weight or less based on the total amount of flux. The reason is that if the amount of magnetic powder in the flux is too large, the static η1 applied to the flags 5) If the new magnetic material is more than 30.iif quantity coefficient, it should be mixed uniformly with other non-magnetic inorganic raw materials (by which the electric The disappearance of is suppressed to a negligible level.

By the way, the following τ welding test example t, 1: shows an example in which arc welding was performed according to the method shown in No. 1181.
JIS YCWI) Bath winter crop: 28OA-24V 80 small t% of inorganic powder such as limestone and fluorite,
pe-si, F'e-Mn, etc. powder 20 weight ratio gear rear gas: Sudden electrostatic charge (=!1 & case: 70 KW Welding of G Qlcg class sieve'i1% force steel was carried out under the above conditions. However, the flux is about 0.15 on the outer periphery of the wire.
It was confirmed that the welding area was uniformly supplied to the welding part with a thickness of mm (mm). Compared to those obtained by conventional gas-shielded arc welding, there was no color at all, and the penetration shape and bead surface properties were better than those obtained by normal gas-shielded arc welding. Qiao also receives ψ1
1. Weld cracks caused by moisture content in the welding metal 4" metal, which are observed in the case of welded arc welding rods, were not observed at all. By the way, the above-mentioned arc In the case of the ltl welding method, since the method is to supply the arc generating Ffjf while assigning a value to I〆d outside the wire, there is the problem that welding fumes are generated as in the case of fIIJ f%t arc welding. Therefore, in the present invention, there is a concern that the number of welding fume generation increases as the welding efficiency improves.

However, this problem can be overcome by adopting a method as shown in FIG. 2, for example. That is, the basic configuration of the welding torch 2 shown in FIG. 2 is almost the same as the example shown in FIG.
A porous wall 9 is provided on the lower surface of 0 to direct the flow of carrier gas to the matrix 8.
The carrier gas guide 11 is formed by extending the lower edge downwardly. And when welding, υ5. Carbon dioxide as carrier gas.

In addition to using a shielding gas such as argon, helium, etc. used in general gas-shielded arc welding, the amount of static electricity applied to the flux F by the applying part 9 to the static V is suppressed to a slightly smaller value, thereby suppressing flux attachment to the wire 1. Weld carefully. As a result, the shielding becomes insufficient due to the decrease in the gas generating agent, but this shortage is sufficiently covered by the gear rear gas (shielding gas) that passes through the lower porous wall 10 of the retention box 6 and is ejected in the l(t4.J direction). Therefore, the amount of welding fume generated due to the thermal decomposition of flux F can be greatly reduced, since the supply value of flux F can be considerably reduced. This also prevents sprouting during deterioration of the cropping environment.

The present invention is carried out using, for example, the above-mentioned apparatus, but the specific configurations Q and J of the welding toe, etc., and the t of the welded joint are
It can be changed arbitrarily by 1,1\, etc.

Also, in the figure, static electricity application 1!6 is provided in a part of the dog? j
Although an example has been shown in which static electricity is added one by one to the flux in the retention box, it is also possible to supply flux to which static electricity has been applied in advance into the retention box.

The present invention (constructed as described above) is capable of achieving superior properties using a coated arc welding rod by performing arc welding while attaching powdered fuwax to the circumference of the wire by electrostatic attraction. This makes it possible to simultaneously secure welding performance and the excellent welding efficiency achieved by the welding wire.

[Brief explanation of the drawing]

No. 1.21 Me 1 shows paddy according to an embodiment of the present invention! , is a schematic vertical cross-sectional explanatory diagram. l...Welding wire 2...Welding torch 8...
Base material 4...Wire guide 5...Electricity tip 6...Fox? I box 9...Electrostatic application section IO...TaR4bo Applicant
Shinto Isakko lit Co., Ltd.

Claims (1)

[Claims] While arc welding is performed while continuously supplying the Oim welding wire to the r# welding part, ii, γ-shaped powder f) is applied to the outer periphery of the welding wire marked + by electrostatic attraction. A~ whose @ characteristic is to supply it to the arc generating part while attaching it to the arc generator.
Welding method, 7