JPH0214861Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a magnetic stirring nozzle for welding that is small and lightweight and has excellent workability.

When an external magnetic field is applied to molten metal during welding,
The Lorentz force acts between the welding current and the external magnetic field, and the welding arc and molten metal are vibrated or stirred, improving the weld bead shape and the solidification structure of the molten metal, with the aim of obtaining good weld metal. Various methods and devices have been devised (for example,
53-172147).

A top view and a side view of a typical magnetic vibration nozzle are shown in FIGS. 1A and 1B, and a cross section of the magnetic vibration nozzle during TIG welding is shown in FIG. In Figure 1 A, B and Figure 2, 1 is a nozzle body made of non-magnetic material, 2
is an excitation coil made of several hundred to several thousand turns of copper wire, 3 is a water-cooled copper tube, 4 is an alternating magnetizing current power source that supplies the excitation coil 3, 11 is an electrode, 12 is a molten metal, 13 is an arc, and 14 is a shield. gas, 15 is the material to be welded, 6
indicates the shielding gas space.

In FIG. 2, when an alternating current is passed through the excitation coil 2 from an alternating magnetizing current power supply 4, an alternating magnetic field is generated in the axial direction of the excitation coil 2. Next, when a welding current is applied to the tungsten electrode 11, the tungsten electrode 1
An arc 13 is generated between the welding material 1 and the welded material 15, and molten metal 12 is formed. Further, shielding gas 14 is caused to flow out from space 6 of nozzle body 1 to protect tungsten electrode 11, arc 13, and molten metal 12 from the atmosphere. Furthermore, cooling water is flowed into the water-cooled copper tube 3 to cool the nozzle body 1 whose temperature increases due to welding arc heat.

In this way, when welding current is passed within an alternating magnetic field,
A kinetic force acts on the molten metal 12 due to the Lorentz force, and the molten metal 12 is vibrated and stirred. Therefore, in the solidification process of the molten metal, weld beads are formed and the metal structure is refined, resulting in a good weld metal.

However, the above magnetic vibration nozzle has the following problems.

(1) Since cooling water is used in the nozzle, supply and drainage hoses are required, which may reduce the workability of the welding torch.

(2) In order to obtain the required magnetic force, the number of turns of the excitation coil is large, and the weight and shape of the nozzle itself are large, which may impair workability.

(3) When using magnetic stirring with this nozzle during TIG or MIG welding, the shielding gas may be disturbed, the shielding effect may be impaired, and the bead surface may be oxidized.

The present invention was devised to solve these problems. A part of the nozzle body or the coil frame body is made of magnetic material, a coil is wound around the nozzle body to form an excitation coil, and the excitation coil is A double shield gas space is provided from the outer periphery to the bottom of the
This relates to a magnetic stirring nozzle for welding, in which a double shield gas inlet pipe is attached to a part of the upper part of the space, and a double shield gas outlet is provided at the bottom of the space and in contact with the lower part of the nozzle body. be.

The new ideas and features of the present invention are as follows.

(1) The magnetic stirring nozzle has a double shield structure to improve the shielding effect.

(2) A structure in which double shielding gas is also used for cooling.

(3) Therefore, cooling water is not required and work efficiency is improved.

(4) By using a magnetic material for a part of the nozzle body or the coil frame body instead of the conventional non-magnetic material,
The magnetic force acting on molten metal becomes several times (approximately three times) stronger.

(5) Therefore, the number of turns of the excitation coil can be reduced to a fraction, the excitation coil can be made smaller and lighter, and workability is improved.

The nozzle of the present invention can be applied to TIG welding, MIG welding, submerged arc welding, and plasma arc welding.

A plan view of an embodiment of the nozzle of the present invention is shown in FIG. 3, and a cross-sectional view is shown in FIG. 4. In Figures 3 and 4, 20
indicates a nozzle body made of magnetic material, 21
22 is an excitation coil wound with enamelled copper wire, 26 and 28 are double shield gas spaces, 27 is a double shield gas introduction pipe, and 29 is a double shield gas flow. The outlet 29 is vertically or outwardly 0°~
Shows that it is tilted within 30 degrees.

Figure 5 shows magnetic stirring TIG using the nozzle of this invention.
A schematic cross-sectional view during welding is shown. In Figure 5, 1st to 4th
The same symbols as in the figures have the same meanings as in FIGS. 1 to 4, and 18 indicates a double shielding gas.

In FIG. 5, when an alternating magnetizing current is passed through an excitation coil 22 from an alternating magnetizing current power source 4, magnetic lines of force are generated, and the lines of magnetic force are connected to a nozzle body 2 made of a magnetic material.
Magnetism is concentrated at 0.

The welding current and the magnetic lines of force that are concentrated and become a strong magnetic force rotate or stir the molten metal 12 by Lorentz force. In the above-mentioned conventional nozzle body 1 made of non-magnetic material, the lines of magnetic force are dispersed because there is no magnetism collecting effect, and the lines of magnetic force that effectively act on the molten metal are weak magnetic forces, but for the same magnetizing current, In the nozzle of the present invention in which the nozzle body 20 is made of a magnetic material, the number of turns of the excitation coil 22 can be reduced to about 1/3.

Next, although the electrode 11, the arc 13, and the molten metal 12 are shielded by the shielding gas 14, in magnetic stirring welding, the arc 13 also vibrates, which tends to cause insufficient shielding. The nozzle of the present invention has a double shield gas structure consisting of a gas inlet pipe 27, gas spaces 26 and 28, and a gas outlet 29, and a double shield gas curtain that flows out from the double shield gas outlet 29 at high speed. , the shield shortage that occurred during welding will be resolved. Moreover, this double shielding gas also has the effect of cooling the exciting coil frame body 21 and the exciting coil 22, which are heated by welding arc heat and resistance heat generation. Therefore, cooling water for the nozzle body becomes unnecessary.

The effects of the nozzle of the present invention detailed above are summarized as follows.

(1) Since the nozzle body 20 is made of a magnetic material, the number of turns of the excitation coil 22 can be reduced due to the magnetism collecting effect, and the welding torch as a whole can be made smaller and lighter, allowing for improved workability and powerful magnetic stirring.

(2) Double-shielded gas nozzle structure improves shielding effectiveness.

(3) Nozzle cooling water is not required, improving the workability of the welding torch.

[Brief explanation of drawings]

Figures 1A and B are a plan view and a cross-sectional view showing a conventional magnetic vibration nozzle, Figure 2 is a schematic cross-sectional view showing the situation during welding when the nozzle shown in Figures 1A and B is used, and Figure 3 The figure is a plan view showing one embodiment of the nozzle of the present invention, FIG. 4 is a sectional view thereof, and FIG.
FIG. 3 is a schematic cross-sectional view showing the situation during welding when the nozzle of the present invention shown in the figure is used. 20... Nozzle body, 21... Coil frame body, 22
...Excitation coil, 26, 28...Double shield gas space, 27...Double shield gas inlet pipe, 29...Double shield gas outlet.

Claims (1)

[Scope of utility model registration request] A part of the nozzle body or the coil frame body is made of a magnetic material, a coil is wound around the nozzle body to form an excitation coil, a double shielding gas space is provided from the outer periphery of the excitation coil to the bottom, and the space is A magnetic stirring nozzle for welding comprising a double shield gas inlet pipe attached to a part of the upper part and a double shield gas outlet at the bottom of the space and in contact with the lower part of the nozzle body.