JPH03204180A - Hot wire tig welding equipment - Google Patents

Abstract

PURPOSE:To perform stable welding with high efficiency without vibration generation of a molten pool of base metals by energizing and heating a wire in advance by electric power impressed through feeding parts. CONSTITUTION:An arc power source 4 is connected to a tungsten electrode 1 and the base metals 2 and a wire heating power source 7 is connected to the feeding parts 8 and 9 provided on a wire feed path till the wire 5 attains the base metals 2 so as not to connect one end to the base metals 2 and the wire 5 is heated by the electric power supplied to the wire 5 through these feeding parts 8 and 9. Accordingly, the wire 5 is not applied with an arc current till attaining the base metals 2 after passing the feeding parts 8 and 9 and arc deflection by a wire current can be almost disregarded in an arc or in the very close vicinity of the arc and an arc blow phenomenon can be obviated substantially. In addition, since it is possible to apply the arc current to a general DC power source, the vibration of the molten pool is not also generated and stable welding can be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to hot wire TIG welding equipment.

2. Description of the Related Art As an example of a conventional hot wire type TIG welding device, one shown in FIG. 2 is known.

TIG welding has the advantage of producing high-quality welds, but has the disadvantage of slow welding speed and low efficiency. As a countermeasure for this, hot wire TIG is used in which the wire is heated in advance.
Welding methods have been put into practical use.

In FIG. 2, l is a tungsten electrode, and the base metal 2 is melted by generating an arc 3 between the tungsten electrode l and the base metal 2. 4 is an arc power source.

5 is a wire, 6 is a wire feeding motor, and 11 is a wire heating power source, which is connected to a power feeding section 12 provided in the wire feeding path and the base material 2, and is connected to the power feeding section 12 and the base material 2. The wire 5 is energized and welding is performed while the wire 5 is heated by Joule heat.

Problems to be Solved by the Invention However, in the conventional example as described above, the arc 3 interferes with the magnetic field generated by the wire heating current (hereinafter referred to as wire current), and a magnetic blowing phenomenon occurs in which the arc 3 is deflected. There is a problem with poor sex.

Therefore, the range of stable conditions for using such a hot wire type TIG welding device is extremely narrow, and it has been difficult to increase the amount of melted wire.

In addition, a method has been proposed in which the arc current and wire current are mutually applied to eliminate magnetic blowing, but in this method, the arc pressure changes in synchronization with the switching of the arc current, causing the surface of the molten pool of the base metal to change. There is a problem in that it vibrates, making it difficult to perform stable and efficient welding.

An object of the present invention is to solve the above-mentioned problems and provide an efficient and stable hot wire TIG welding device that does not cause magnetic blowing phenomenon and does not generate vibrations in the molten pool of the base material. .

Means for Solving the Problems In order to achieve the above object, the present invention provides a hot wire type TIG welding device having a non-consumable electrode for welding while feeding an energized and heated wire to a welding part, in which the wire reaches the base metal. A power supply section from a wire heating power source was provided via an insulator in the wire supply path up to the wire supply section, and a hot wire type TIG welding device was created in which the wire was heated in advance by electricity applied through the power supply section.

Operation In the present invention, the arc power source is connected to the tungsten electrode and the base material, and the wire heating power source is connected to a power feeding section provided on the wire feeding path until the wire reaches the base material so as not to connect one end to the base material. The wire is heated by electric power supplied to the wire through this power feeding section.

Therefore, after the wire passes through the power supply part, the arc current is not applied until it reaches the base metal, and the deflection of the arc by the wire current during the arc or in the very vicinity of the arc is almost negligible, virtually eliminating the magnetic blowing phenomenon. be able to.

Furthermore, since the arc power source can be a general DC power source, no vibration of the molten pool occurs and stable welding can be performed.

EXAMPLE Hereinafter, a hot wire type TIG welding apparatus which is an example of the present invention will be explained based on the drawings.

In Fig. 1, l is a tungsten electrode, 2 is a base material, and 3 is a tungsten electrode.
is an arc, and 4 is an arc power source. Arc power supply 4 is TI
A G power source is connected to the tungsten electrode 1 and the base material 2, and an arc 3 is generated between them. 5 is a wire, and 6 is a wire feeding motor.

7 is a wire heating power source, and this wire heating power source 7 is connected to power feeding parts 8 and 9 provided in the wire feeding path, and the power feeding parts 8 and 9 are insulated with an insulator 1O. The wire 5 is fed by a wire feeding motor 6 and heated by electricity between power feeding sections 8 and 9.

In the above configuration, since the electrical heating of the wire 5 is regulated by the mounting positions of the two power supply parts 8 and 9, there is no need to supply electricity in the arc 3 or in the very vicinity of the arc 3. Therefore, there is no deflection of the TIG arc, magnetic blowing can be eliminated, and efficient welding can be performed.

Further, since the arc power source 4 can be a general DC TIG power source, it is inexpensive, and there is no vibration of the molten pool of the base material 2 during welding, allowing stable welding to be performed.

Further, as the wire heating power source 7, either a general DC power source or an AC power source can be used.

Effects of the Invention As described above, according to the present invention, efficient welding can be performed by eliminating the magnetic blowing phenomenon without generating vibration of the molten pool of the base metal with an inexpensive configuration using a general power source. Provided hot wire TIG welding equipment.

[Brief explanation of drawings]

FIG. 1 shows a hot wire type TI as an embodiment of the present invention.
FIG. 2 is a circuit diagram of a conventional G welding device. 1-...Tungsten electrode 2...Base material 3...Arc 4...Arc power supply 5...Wire 7...
・Wire heating power supply 8.9...Power supply part lO...Insulator

Claims (1)

[Claims] In a hot wire type TIG welding device that has a non-consumable electrode that performs welding while feeding an energized and heated wire to the welding part, the wire feeding path until the wire reaches the base metal includes:
A hot wire type TIG characterized in that a power supply section from a wire heating power source is provided via an insulator, and the wire is heated in advance by electricity applied through the power supply section.
Welding equipment.