JPH0437478A - Ultrasonic vibration arc welding method - Google Patents

Abstract

PURPOSE:To reduce a deposition loss, to form a sound weld bead with satisfactory workability and to perform welding free from defects by adding a magnetic field of ultrasonic frequency in the coaxial direction to the welding wire tip to perform welding. CONSTITUTION:In the ultrasonic vibration arc welding method, the ultrasonic vibration is added electromagnetically to an arc 6 of the welding wire 3 tip fed continuously and metal molten by arc heat generated between base metals 4 and a welding wire 3 is made into fine globules and transferred to the base metals 4. Accordingly, the generation of spatters is prevented and satisfactory welding is performed and the deposition loss is obviated and the sound weld bead is formed.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to an ultrasonic vibratory arc welding method.

[Conventional technology]

In arc welding, such as conventional MIG and MAG welding, in which a welding wire energized by a welding power source is continuously fed and welding is performed by generating an arc between the welding wire and the base metal, small particles are removed from the welding wire end or molten metal. There is a sputtering phenomenon in which droplets are scattered, and if this is severe, it not only causes welding loss but also hinders work and can cause welding defects.

However, welding loss due to the spunter phenomenon can reach 10 to 15% of the melted amount of the welding wire, so in recent years countermeasures have been taken such as superimposing a pulse current on the welding power source and using welding wire with franks. ,not enough.

Generally, the causes of spatter include the release of bubbles in the molten metal, explosion of gas, scattering due to arc force, and shock current during arc regeneration. It is not easy to take measures to eliminate it.

[Problem to be solved by the invention]

The present invention was proposed in view of these circumstances, and
Provides an ultrasonic vibrating arc welding method that reduces welding loss by reducing or eliminating spatter by making droplets at the tip of a welding wire finer, and also forms a sound weld bead with good workability and yields a defect-free weld. The purpose is to

[Means to solve the problem]

To this end, the present invention provides an arc welding method in which welding is performed by continuously feeding a welding wire and generating an arc between the welding wire and the base metal, in which a coaxial magnetic field of ultrasonic frequency is applied to the tip of the welding wire. It is characterized by welding.

[Effect]

In the ultrasonic vibrating arc welding method of the present invention, ultrasonic vibration is electromagnetically applied to the arc at the tip of the welding wire that is continuously fed, and the arc heat generated between the base metal and the welding wire melts the welding wire. The deposited metal becomes fine droplets and transfers to the base metal, preventing the generation of spatter and ensuring good welding, resulting in no weld loss and a sound weld bead.

〔Example〕

An embodiment of the ultrasonic vibrating arc welding method of the present invention will be explained with reference to the drawings. Fig. 1 is a schematic diagram showing the implementation procedure of the method of the present invention, and Fig. 2 is an explanation showing the principle of vibration of the welding arc in the method of the present invention. 3 are explanatory diagrams showing the principle of ultrasonic vibration exerted on a welding wire.

In FIG. 1, a welding wire 3 is continuously fed to a welding torch 1 from a wire feeding device 2, and is projected from the tip and faces a base material 4. A welding power source 5 is connected to the welding torch 1 and the base metal 4 for supplying a current to generate an arc 6 between them. Further, a coil 7 is wound around the tip region of the welding torch 1 coaxially with the tip of the welding wire 3, and both ends of the coil 7 are connected to an ultrasonic frequency generator 8.

In such a device configuration, when a current is supplied from the welding power source 5 between the continuously supplied welding wire 3 and the base metal 4, an arc 6 is generated between the tip of the welding wire 3 and the base metal 4, and the welding is interrupted. The wire 3 is continuously melted from the tip and welding progresses.

At this time, when ultrasonic frequency power is supplied from the ultrasonic frequency generator 8 to the coil 7 wound coaxially with the tip of the welding wire 3, the ultrasonic frequency is electromagnetically applied to the molten metal at the tip of the welding wire 3. Vibration is applied to make the droplets finer.

The principle of electromagnetically generating ultrasonic vibrations in a droplet by the coil 7 wound coaxially with the welding wire 3 will be explained with reference to FIGS. 2 and 3.

In FIG. 2, when an arc 6 is generated from the tip of the welding wire 3, a coaxially wound coil 7 has an arc of about 5 to 30 mm.
When a current with an ultrasonic frequency of kHz is applied, an alternating magnetic field is generated in parallel to the welding wire 3. At this time, the welding current l in the arc 6 flows in a conical shape, and the alternating magnetic field interlinks with the current component that is not parallel to the welding wire 3, generating vibration in the rotational direction according to Fleming's law, and the tip of the welding wire 3 The molten metal is also subjected to force and is vibrated.

On the other hand, as shown in FIG. 3, the arc generation point at one end of the welding wire 3 is at the end of the coil 7, and in the case of a magnetic material, it is attracted into the coil 7 and vibrated in the axial direction by the alternating magnetic field.

Thus, due to these two phenomena, the welding wire 3
The molten metal at the tip becomes fine droplets due to ultrasonic vibration and transfers to the base material 4, reducing or eliminating spatter generation.
Welding loss is reduced and a healthy weld bead is formed with good workability.

〔Effect of the invention〕

In short, according to the present invention, in an arc welding method in which welding is performed by continuously feeding a welding wire and generating an arc between the welding wire and the base metal, a coaxial magnetic field of an ultrasonic frequency is applied to the tip of the welding wire. By performing welding, the droplets at the tip of the welding wire are miniaturized, spatter is reduced or eliminated, and welding loss is reduced. At the same time, a sound weld bead is formed with good workability, and a defect-free weld is obtained. The present invention is industrially extremely useful because it provides a sonic vibration arc welding method.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the implementation procedure of the ultrasonic vibrating arc welding method according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the principle of vibration of the welding arc in the method of the present invention, and FIG. FIG. 3 is an explanatory diagram showing the principle of ultrasonic vibration exerted on a welding wire. ■...Welding torch, 2...Wire feeding device, 3...
・Welding wire, 4...Base metal, 5...Welding power source, 6.
...Arc, 7...Coil, 8...Ultrasonic frequency generator. Agent Patent Attorney Masaru Tsukamoto Text Zhui vL'! :Look at it

Claims (1)

[Claims] An arc welding method in which welding is performed by continuously feeding a welding wire to generate an arc between the welding wire and the base metal, characterized in that welding is performed by applying a coaxial magnetic field of ultrasonic frequency to the tip of the welding wire. Ultrasonic vibrating arc welding method.