JP2000263227A - Magnetic stir welding torch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To satisfactorily display a magnetic stir effect at the time of magnetic stir welding to the narrow groove of a middle thick plate. SOLUTION: A magnetic coil 18 is mounted as one body through an iron core 17 on an outer periphery on the upper side of a torch cup 11 guiding the flow of shield gas, which is mounted on the lower part of a torch main body 1. On the outer periphery on the lower side of a torch cap 8, an adapter 19 made of a magnetic substance is mounted so that it communicates with the iron core 17. A magnetic field generated by the magnetic coil 18 is reached to the surroundings of an electrode through the adapter 19, and welding is performed with a high magnetic flux density.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic stir welding torch used for narrow groove welding.

[0002]

2. Description of the Related Art A conventional TIG welding torch as a conventional welding torch used for welding a narrow groove when two members to be welded are butt-welded is shown in FIG. The upper end of a collet holding cylinder 4 having a tapered portion 3 at the lower end is attached to the lower end of the vertical electrode insertion hole 2 provided at the center of
A collet 6 having a slit 5 in a lower required range and having a lower end tapered to engage with the inner surface of the tapered portion 3 of the collet holding cylinder 4 is inserted and arranged in the collet holding cylinder 4. The torch is inserted into and held by a tungsten electrode 7 in the up-down direction, and the upper end of the collet 6 located in the electrode insertion hole 2 of the torch main body 1 so that the lower end surface contacts the upper end surface of the collet 6. The cap 8 is screwed in, and the lower end of the collet 6 is pressed against the inner surface of the tapered portion 3 of the collet holding cylinder 4 to fix the electrode 7 by tightening the torch cap 8. An outer shell 9 is provided integrally on the lower periphery of the lower part 4, and a gas lens 10 is attached to a lower end opening of the outer shell 9,
At the top of the torch body 1, a torch cup 11 having a narrowed lower end is attached to the outer periphery of the outer shell 9 via a seal packing 14 so as to surround the collet holding cylinder 4 and the outer shell 9. The shield gas 13 supplied to the gas supply path 12 of the torch main body 1 is guided from the inside of the collet holding cylinder 4 to the inside of the outer shell 9, and is discharged from the tip (lower end) of the torch cup 11 through the gas lens 10 while the electrode 7 Welding wire 1 by the heat of the arc generated at the tip
The welding of a groove or the like is performed by fusing 5.

However, in the narrow groove welding using the above-mentioned conventional TIG welding torch, when a narrow groove of a medium-thick plate (40 mm or less) is welded, the arc pool does not spread and defects are present at the edge of the groove wall. Since this is likely to occur, welding must be performed with the supply amount of the wire 15 (wire speed) suppressed, and there is a problem in efficiency.

Therefore, as shown by a two-dot chain line in FIG. 2, for example, a magnetic coil 16 having a diameter of about 60 mm is fitted around the outer periphery of the tip of the torch cup 11, and a magnetic field is applied to the vicinity of the welded portion by the magnetic coil 16. Magnetic stir welding in which welding is performed while applying stirring force by Lorentz force to an arc pool may be adopted.

[0005]

However, the above TIG
In the case of the welding torch, the electrode 7
The torch cup 1 is used in order to improve the gas shielding effect.
Therefore, when the magnetic coil 16 is fitted into the lower end of the torch cup 11, the arc generated from the tip of the electrode 7 becomes difficult to see, and the welding while monitoring the welding condition is performed. If the diameter of the magnetic coil 16 is increased to increase the output,
There is a problem that it becomes more difficult to see.

On the other hand, if the magnetic coil 16 is fitted on the upper end side of the torch cup 11 so that the arc can be easily viewed, the distance to the tip of the electrode 7 becomes longer, and the magnetic output decreases. In the case of the conventional method in which the magnetic coil 16 is fitted to the tip of the torch cup 11 as described above, the magnetic output is small because the diameter of the magnetic coil 16 cannot be increased, and thus the plate thickness is as small as about 20 mm. There is a problem that only the groove can give the magnetic stirring effect.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a magnetic stir welding torch which makes it easy to see an arc and can exert a magnetic stirring effect well even on a narrow groove of a medium thick plate.

[0008]

According to the present invention, in order to solve the above-mentioned problems, a torch cup for discharging a shielding gas through the periphery of the above-mentioned electrode is provided at a lower portion of a torch body for inserting and holding the electrode. A magnetic coil is integrally mounted on the upper outer periphery of the torch cup via a cylindrical iron core, and a magnetic adapter is mounted on the lower outer periphery of the torch cup. The adapter has a configuration in which the lower end portion of the adapter has a shape of an aperture along the outer shape of the lower side of the torch cup.

Since the magnetic coil moves away from the tip of the electrode,
The arc emitted from the tip of the electrode becomes easier to see, while the magnetic coil moves away from the tip of the electrode, so that the output can be increased by enlarging the magnetic coil, even if the adapter is attached away from the tip of the electrode. Since the magnetic field generated by the magnetic coil reaches the vicinity of the electrode through the adapter, the output of the magnetic coil does not decrease.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In a configuration similar to the TIG welding torch shown by a solid line in FIG. A magnetic coil 18 is integrally mounted to form a torch with a magnetic coil, and a lower end portion is formed on the outer periphery of a lower side of the torch cup 11 so that a lower end portion is formed in a drawing shape along the outer shape of the lower side of the torch cup 11. Adapter 19
To make the iron core 17 magnetically conductive.

As a conduction structure between the iron core 17 and the adapter 19, for example, a screwing structure, a fitting structure, a welding integrated structure, or the like is adopted.

Reference numeral 20 denotes a narrow groove formed by abutting the plate members 21. Other configurations are the same as those shown in FIG. 2, and the same portions are denoted by the same reference numerals.

In the case of the magnetic stir welding torch of the present invention having the above-described structure, the magnetic coil 18 is integrally mounted on the upper side of the torch cup 11 away from the vicinity of the arc. In this case, the output can be increased by increasing the length of the
And the magnetic field generated by the magnetic coil 18 reaches the vicinity of the electrode 7 through the adapter 19, even if the adapter is made of a magnetic material attached to the iron core of the magnetic coil 18 away from the tip of the magnetic coil 18. The magnetic flux density at the tip of the electrode 7 can be made stronger, and the arc pool can be expanded. Therefore, even when used for welding the narrow groove portion 20 of the middle thick plate, no defect occurs at the wall edge, and the wire supply amount can be increased.

Further, as described above, the position of the magnetic coil 18 is separated from the position of the tip of the electrode 7, and the adapter 19 is formed so as to follow the outer shape of the lower part of the torch cup 11 and does not spread around. Therefore, the arc generated from the tip of the electrode 7 can be easily seen, and therefore, welding can be performed while monitoring the welding condition.

The magnetic stir welding torch of the present invention shown in FIG. 1 is based on the structure of the TIG welding torch shown in FIG. 2, but the structure inside the torch body 1 and the torch cup 11 is shown in FIG. It is needless to say that the present invention is not limited to those described above, and that various changes can be made without departing from the scope of the present invention.

[0017]

Next, the results of experiments conducted by the present inventors are shown in Tables 1 and 2.

Table 1 compares the magnetic flux densities of the magnetic stir welding torch of the present invention with the adapter 19 shown in FIG. 1 and the one without the adapter 19, regardless of the electrode protrusion length. This indicates that a higher magnetic flux density was obtained.

[0019]

[Table 1] Table 2 compares the wire speeds of the magnetic stir welding torch of the present invention with the adapter 19 shown in FIG. 1 and the conventional TIG welding torch without the magnetic coil 16 shown in FIG.
In the case of the magnetic stirring welding torch of the present invention, a large magnetic output can be obtained, so that more wires can be supplied as compared with the conventional TIG welding torch (approximately 1.6 times the working conditions can be obtained). I understand.

[0020]

[Table 2]

[0021]

As described above, according to the magnetic stir welding torch of the present invention, the torch cup for ejecting the shielding gas through the periphery of the electrode is provided below the torch main body through which the electrode is inserted and held. A magnetic coil is integrally mounted on the upper outer periphery of the torch cup via a cylindrical iron core, and a magnetic adapter is mounted on the lower outer periphery of the torch cup. The magnetic field generated by the magnetic coil is applied to the vicinity of the welded part through the adapter because the lower end of the adapter is shaped as a throttle along the outer shape on the lower side of the torch cup. , The magnetic flux density at the tip of the electrode can be increased, and the magnetic pool can be given a good magnetic stirring effect. It can also be applied to the welding of narrow gaps of medium thickness plates to improve the working conditions, and it is easy to see the arc emitted from the electrode tip, and it is possible to perform welding while monitoring the welding condition, etc. Demonstrate.

[Brief description of the drawings]

FIG. 1 is a schematic view showing one embodiment of a magnetic stir welding torch of the present invention.

FIG. 2 is a sectional view showing an example of a TIG welding torch.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Torch main body 7 Electrode 11 Torch cup 13 Shielding gas 17 Iron core 18 Magnetic coil 19 Adapter

Claims (2)

[Claims] 1. A torch cup for discharging a shielding gas through the periphery of the electrode is attached to a lower portion of a torch main body through which the electrode is inserted and held, and a cylindrical iron core is attached to an outer periphery of an upper side of the torch cup. A magnetic coil is integrally attached to the iron core, and a magnetic adapter is attached to an outer periphery of a lower portion of the torch cup so as to be magnetically connected to the iron core. Stir welding torch. 2. The magnetic stir welding torch according to claim 1, wherein the shape of the lower end of the adapter is a drawn shape along the outer shape on the lower side of the torch cup.