JPS63101082A - Welding machine with both tig-mig characteristics - Google Patents

Abstract

PURPOSE:To improve welding efficiency and to prevent the occurrence of weld defects by compounding a TIG torch and a MIG torch and supplying a welding current to these torches alternately to perform the welding. CONSTITUTION:A MIG electrode 13 and a TIG electrode 12 are arranged to the inside of a cylindrical or elliptic cylindrical gas cap 14 respectively to insulate electrically between both the electrodes 13 and 12 by an insulator 11. At this time, a welding wire 10 is passed through the electrode 13 and nonconsumable tungsten 4 is held by the electrode 12 and shielding gas 7 is supplied between both the electrodes 12 and 13, and the gas cap 14. Next, the welding current is supplied to the electrodes 12 and 13 alternately from a power source for welding and molten metal 2 is formed on base metal 1 and a bead 3 is formed. Since a large quantity of molten metal is formed by the MIG electrode 13 and the sound molten metal is formed by the TIG electrode 12, the welding efficiency is improved and the occurrence of the weld defects can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a welding machine having both TIG and MIG characteristics, which is applicable to improving the welding efficiency of thick-walled pipes, containers, etc.

[Conventional technology]

Conventional welding methods include TIG welding, as shown in Figure 3 and MIC welding methods, respectively.
The welding method is to generate an arc 05 between the non-consumable tungsten electrode 04 in the gas cap 08 and the base metal 01, cover the outside of the arc 05 with shielding gas 07 (-Ar), and insert an additive wire between it and the arc 05. 06 is added, molten metal 0
form 2.

In the MIG welding method, an arc 05 is generated between a consumable welding wire 010 in a welding wire energizing tip 09 and a base metal 01, and the outside of the arc 05 is covered with a shielding gas 07 (Ar) to melt the welding wire 010. Welding is performed by balancing the amount of melt and the amount of feed.

[Problem that the invention seeks to solve]

As mentioned above, currently commonly used welding methods include 'rIG welding method and MIG welding method, each of which has advantages and disadvantages. Typical characteristic differences are TI
In the G method, an arc is generated between a non-consumable tungsten electrode and a workpiece, and a filler metal is added in between, so it has the advantage of being able to control the amount of heat and the filler metal separately.

Therefore, since the amount of heat input can be increased or decreased depending on the molten state of the base metal or filler metal, it is easy to obtain a sound welding result. However, on the other hand, the amount of melted filler metal is half that of other methods, and the welding speed is slow. MIC)
In this method, an arc is generated between the consumable wire electrode and the workpiece, and welding is performed by balancing the amount of melted wire and the amount of wire feeding, and the amount of heat and the amount of wire feeding always have a constant relationship. Therefore, the melting amount of the wire can be obtained at maximum efficiency with respect to heat input, so it has the advantage of fast welding speed.

Unlike the TIG method described above, it is not possible to independently increase or decrease the amount of heat input depending on the situation, so there are drawbacks such as defects (for example, poor fusion) being likely to occur.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has a gas cap that insulates and integrally attaches the TIG electrode I G circumferential electrode, and when welding the TIG electrode I G
Welding is performed by supplying current alternately to the circumferential electrodes. That is, by combining TIG)-chi and MIG)-chi and alternately supplying welding power source (voltage, current) to them for welding, TIG-chi has the advantages of both the TIG method and the MIG method. This provides a MIG dual characteristic welding machine.

[Effect]

The TIG-MIG dual characteristic welding machine of the present invention has the mechanism as described below, so it is possible to form a large amount of molten metal with the MIG electrode, and there are two problems in this case: molten metal and base material. This is a welding method that can compensate for poor fusion between the two using a TIG electrode.

〔Example〕

Hereinafter, nine embodiments of the present invention will be specifically described based on embodiments shown in the drawings. FIG. 1 shows a TIG-MI according to an embodiment of the present invention.
The front view of the welding state to which the G-characteristic welding machine is applied. FIG. 2 is an explanatory diagram showing an example of the current waveform of the supplied current according to the present embodiment, in which (a) the figure shows an AC power supply, and the same figure (b) shows the case of a DC power supply. Give an explanation.

The welding torch of the present invention has a welding wire 10 passed inside a cylindrical or internal cylinder-shaped gas cap 14, and an MIG electrode 18 for supplying current and voltage.

On the other side, a TIG electrode 12 holding non-consumable tungsten 4 and supplying current and voltage is provided. These electrodes are completely electrically insulated by providing an insulator 11 between them. Also, there is a slight distance between these electrodes and the gas cap 14.

The shielding gas 7 is configured to communicate with that portion from the outside.

Electrodes for TIG 12 Electrodes for MIG 13 Current is alternately supplied from a device (not shown) to create molten metal 2 on base material 1 to form a bath weld bead.

An example of supplying these currents is shown in FIG.

The (-) figure shows the case of AC power supply.

(g) A case where the positive electrode is the TIG electrode A; (c) a case where the negative electrode is alternately energized to the M IG circumferential electrode B.

These pulses are desirably in the range of several hertz to several hundred hertz. In addition, the same figure (b) shows the case of a DC power supply, in which two power supplies (TIG current C and MIG current D) are passed alternately to the electrodes, but pulses with different phases are sent to the electrodes. sink.

Never turn on power at the same time.

〔Effect of the invention〕

As specifically explained above, in the present invention, MIG
A large amount of molten metal can be bath-deposited from the TIG electrode with high efficiency, and welding can be performed without poor fusion between the TIG electrode molten metal and the base metal.

[Brief explanation of the drawing]

FIG. 1 is a front view of a welding state using a TIG-MIG dual characteristic welding machine according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of the current waveform of supplied electrodeposition according to the present embodiment. Figure (a) shows an AC power supply, and Figure (b) shows a DC power supply. FIG. 8 is a front view showing a conventional TIG welding method, and FIG. 4 is a front view showing a conventional MIG welding method. l...Base metal, 2...Bath melt metal, 3...Weld bead.

Claims (1)

[Claims] A TIG-MIG dual characteristic welding machine that has the advantages of both the TIG method and the MIG method by combining a TIG torch and a MIG torch and alternately supplying welding power to them for welding.