JPH05318Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a coated welding rod for arc welding, and more particularly to a coated arc welding rod improved to have flexibility.

[Conventional technology]

FIG. 6 shows a conventional example of a coated arc welding rod, in which FIG. 6A is a cross-sectional view, and FIG. 6B is a partial longitudinal sectional view.

This type of welding rod consists of a core wire 1, which is the main body of weld metal, and a covering material 2, which is made of solid flux.

Since the above-mentioned covering material 2 is a brittle material, when the welding rod is bent, it breaks into small pieces and peels off from the core wire.

This type of welding rod is used by being held in a welding holder, but it is not easy to use it up to the end, and the yield is generally said to be around 70%.

[The problem that the idea attempts to solve]

As mentioned above, the conventional coated arc welding rod has a straight rod shape and cannot be bent freely.
Welding work near obstacles is extremely difficult.

As a result, it is impossible to weld the shadow parts that are not visible to the worker. The reason for this is that a straight rod-shaped welding rod cannot be inserted where it cannot be seen in a straight line.

This idea was created in view of the above circumstances.
It is an object of the present invention to provide a coated arc welding rod that can weld narrow areas that could not be welded with conventional coated arc welding rods, and that can contribute to improving yield.

[Means to solve the problem]

In order to solve the above object, it is desired to develop a coated arc welding rod that can be bent freely.However, the coated arc welding rod according to the prior art (Fig. 6) has a brittle coating material 2, and the core wire It could not be bent because it peeled off easily. Therefore, in the present invention, a core wire that can be plastically deformed in the bending direction is inserted into a flexible tube having an inner diameter larger than the outer diameter of the core wire, and a spacer is provided between the two.
The space formed by the spacer (between the core wire and the tube) was filled with powdered or fine-grained flux.

[Effect]

According to the above configuration, the core wire can be bent into a desired shape.

When the core wire is bent, the flexible tube is bent accordingly.

When the core wire and the tube are bent, the space between them is maintained by the spacer, and the powdery or fine-grained flux within the space flows and adapts to the bending, so as not to interfere with the bending operation. This powdery or fine-grained flux always surrounds the core wire with a constant thickness.

Therefore, by bending this flexible welding rod into a desired shape, arc welding in narrow spaces becomes possible.

〔Example〕

FIG. 1 shows an embodiment of a coated arc welding rod according to the present invention, where A is a cross section and B is a partial longitudinal section.

A core wire 3 is made of a plastically deformable material and can be bent freely by hand. However, it can be easily bent using hand tools.

As shown in FIG. 1A, the core wire 3 of this example is constructed so that its cross section has a shape similar to a rhombus.

When implementing the present invention, the cross-sectional shape of the core wire can be arbitrarily set, but if it is made into a flat diamond shape as in this example, it is possible to concentrate a large amount of weld metal in the welding area, and to separate it from the base metal and create an ionic atmosphere. This is advantageous because more flux can be supplied to areas where the arc becomes unstable due to thinning.

It is desirable that the length of the core wire is as long as possible within a range that allows transportation and handling. This is because if the terminals are made long, they are consumed sequentially starting from the end, which reduces the ratio of discarding unused terminals and improves the yield.

4 is a tube having an inner diameter D larger than the maximum outer diameter d of the core wire 3.

In this example, the tube 4 is made of a soft polyvinylidene chloride synthetic resin. When carrying out the present invention, the material of this tube is not particularly limited, but a flexible synthetic resin material that is flexible at room temperature is used.

5 is a spacer for keeping the tube 4 and the core wire 3 concentric.

As a result, a space is formed between the tube 4 and the core wire 3, and this space is filled with powdered or fine-grained welding flux 6.

In this example, powdered flux was used, and the filling rate was
99%.

The spacer 5 of this example was molded integrally with the tube 4 using the same material.

The spacer 5 in this example has a spiral configuration.
When implementing the present invention, by configuring the spiral surface as in this example, it is easy to fill the flux 6, it is easy to follow the bending of the core wire 3 and the tube 4, and when the core wire 3 is bent, it is concentric with the tube 4. Excellent ability to hold.

When implementing this invention, tube 4 and spacer 5
It is also possible to configure the and with separate members, but
Integrally molding as in this example is advantageous because the number of component parts is small, assembly work is easy, manufacturing cost is low, and it is mechanically advantageous and does not cause misalignment.

FIG. 2 shows a situation in which a flexible coated arc welding rod 9 according to the present invention is held between welding holders 10 and the bases of columnar members 8 standing on a plate member 7 are being welded. A flexible coated arc welding rod 9 is cut to an appropriate length and is used by wrapping it around the base of the columnar member 8.

The above cutting will be described in detail later with reference to FIG.

Further, details of the welding work will be described later with reference to FIG. 4.

FIG. 3 shows a state in which a flexible coated arc welding rod 9 is wound around the bottom plate 11a of the box-shaped member 11 in order to weld a gourd-shaped metal fitting 12 thereto.

FIG. 4 shows an enlarged view of the vicinity of the metal fitting 12 with electrical wiring added thereto.

13 is a welding machine, which is connected to a three-phase 200V AC power source. 13a is a ground terminal, which is connected to the gourd-shaped metal fitting 12.

A flexible coated arc welding rod 9 wrapped around the base of the gourd-shaped metal fitting is sandwiched between welding holders 10.

The welding holder 10 is connected to the welding terminal 13b of the welding machine 13, and the arc start holder 14 is connected to the welding terminal 13b.

The arc is started with an arc starting rod 15 (ordinary covered earth welding rod may also be used) clamped to the arc starting holder 14. When the arc is generated, the welding part automatically moves along the flexible covered arc welding rod 9, and substantially the entire circumference of the gourd-shaped metal fitting 12 is welded.

The welding current used in the flexible coated arc welding rod according to the present invention can be used regardless of whether it is direct current or alternating current. The welding current must be changed as appropriate depending on the diameter of the core wire used, that is, the nominal diameter of the rod. In general, it is considered best to perform backward welding using a covered arc welding rod with the welding rod at an angle of 60 to 80 degrees with respect to the direction of travel, and the appropriate current value to be used also depends on the diameter of the welding rod used. However, in the example shown in Figure 4, the coated arc welding rod of the present invention is set parallel to the welding line, so the welding current is increased by approximately 30% when used. Otherwise, stable results cannot be obtained.

If the overcurrent becomes excessively large, the weld metal will scatter a lot and the welding rate will decrease.

As mentioned above, the core wire 3 and tube 4 of this embodiment are long and can be cut into required dimensions for use, resulting in a good yield. In this example, the tube 4 is made of thermoplastic synthetic resin, and the fifth tube 4 is made of thermoplastic synthetic resin.
It was cut as shown in the figure.

FIG. 5 is a schematic cross-sectional view showing the structure and operation of the cutter.

16a and 16b and 17a and 17b are a pair of forming tools equipped with heaters that sandwich the tube 4, respectively.

The thermoplastic tube 4 is pinched with a forming tool equipped with a heater and narrowed to a small diameter, and is brought into close contact with the core wire 3 to seal leakage of the flux 6.

18a, 18b _-1 , and 18b _-2 are cutter blades for cutting the core wire 3.

According to this cutter (FIG. 5), a long flexible coated arc welding rod can be quickly and easily cut at any location without leaking flux.

[Effect of idea]

As explained above, according to the flexible coated arc welding rod of the present invention, it is possible to weld in a narrow place, and the welding in the narrow place can be progressed semi-automatically with high efficiency. No seams in the bead.

Moreover, the yield of welding rods is improved.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of a flexible coated arc welding rod according to the present invention, in which FIG. 1A is a cross-sectional view and FIG. 1B is a partial vertical cross-section. FIGS. 2 and 3 are perspective views showing the use of the flexible coated arc welding rod of the above embodiment, respectively. FIG. 4 is a detailed explanatory diagram of the usage state shown in FIG. 3. FIG. 5 is an explanatory diagram of a method of cutting the flexible coated arc welding rod of the above embodiment. FIG. 6 shows a conventional coated arc welding rod, in which FIG. 6A is a cross-sectional view and FIG. 6B is a partial longitudinal sectional view. 3...Core wire, 4...Tube, 5...Spacer, 6...Flux.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A core wire that can be plastically deformed in a bending direction, a tube made of flexible synthetic resin that fits loosely into the core wire, and a spacer provided between the tube and the core wire. A flexible coated arc welding rod comprising: a powdery or fine-grained flux filled in the space between the core wire and the tube formed by the spacer. 2. The flexible coated arc welding rod according to claim 1, wherein the spacer is integrally formed on the inner surface of the tube. 3. The flexible coated arc welding rod according to claim 1 or 2, wherein the spacer has a spiral shape. 4. The flexible coated arc welding rod according to claim 1, wherein the core wire has a rhombic cross section or a shape similar to this. 5. The flexible coated arc welding rod according to claim 1, wherein the tube and spacer are made of thermoplastic synthetic resin.