JPS61119381A - Spatter preventing method of consumable electrode type arc welding - Google Patents

Abstract

PURPOSE:To prevent effectively the generation of a spatter even within the range of a welding current pulse frequency, in which the generation of a spatter is hardly prevented, by giving an ultrasonic oscillation to a welding wire being a consumable electrode in case of a consumable electrode type arc welding. CONSTITUTION:An oscillation is given indirectly to a welding wire 1 by attaching an ultrasonic wave oscillator 7 to a wire guide 3 incorporated in a welding torch 2. Even in case of a one pulse one droplet welding by a conventional pulse power source, the generation of a spatter increased suddenly in a range in which a pulse frequency is other than 200-300Hz. By giving the ultrasonic oscillation, the generation of a spatter is lowered within the range of 200-300Hz, and it is lowered enough even in other range. In this regard, the ultrasonic wave oscillator 7 can be attached to the wire guide 3 placed near the torch 2, too.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a droplet detachment technique for preventing spatter generation in consumable electrode arc welding.

[Background of the invention]

A problem that must be solved during consumable electrode arc welding is the prevention of spatter. The spout is a piece of molten metal that is formed by scattering droplets of molten metal during welding.

In order to prevent the occurrence of splinters and ivy, it is sufficient to eliminate short circuits between the welding wire and the welding area. In order to eliminate short circuits, it is sufficient to separate the droplets and make them into a spray state, but as a means of making the droplets finer, conventional methods have been to improve the detachability of the welding wire by changing the composition of the welding wire. However, there was a method in which a welding current was generated by a dull source and the droplets were separated from the welding source. However, with these means, the droplet separation is not perfect, and in particular, the formation of l p4 las 1 droplets using a lucid power source is inconvenient because the I4 lus frequency range used is narrow.

[Purpose of the invention]

The present invention has been made in view of the above problems, and it is an object of the present invention to provide a method by which droplets can be detached regardless of the frequency of welding current.

[Means to achieve the purpose]

The present invention was made based on the fact that droplets can be detached regardless of the frequency of the welding current by forcibly applying vibrations from the outside without relying on an arm power source. Ultrasonic vibration was adopted as a means of generating vibration from the outside. That is,
Vibration is applied to the welding wire by an ultrasonic oscillator, and droplets generated from the welding wire are separated by this vibration.

[Embodiments of the invention]

An embodiment of the present invention will be described with reference to FIG.

The welding wire 1 was once guided by a cylindrical wire guide 5 that passed through the inside of the welding torch 2, and was held by a contact chiller 4 located at the tip of the welding torch 2. A nozzle 5 exists to spray the sent shielding gas 6 along the welding wire 1. Now, the ultrasonic oscillator 7 is built into the welding torch 2 and indirectly applies vibration to the welding wire 1 via the wire guide 5.

Next, a comparison between the embodiment shown in FIG. 1 and the conventional example will be made with reference to FIG. That is, the conventional example is pulse welding in which II Talus 1 droplet is produced by a Gurus power source, and the Pulse frequency of the welding current (at a welding voltage of 227) is 200 to 500 H? In other ranges, the amount of spatter generated increases rapidly.
Unable to prevent arm ivy. On the other hand, in this embodiment, one pulse of skin melting using an arm lasing power source and droplet detachment using ultrasonic vibration were performed together. Welding current /
When the Dulse wavenumber is within the range of 200 to 500 HE, the amount of spatter generated is much lower.
Even in the range other than Hgl, the amount of soot and ivy generation is sufficiently low. Therefore, it has been found that the present embodiment can prevent the occurrence of spatter even in a range of welding current where it has not been possible to prevent the occurrence of spatter in the past.

In addition, the welding current in the above conventional example and this example is as follows:
Welding current 20 OA, voltage 22v1 welding speed 1500m
/min, consumable electrode protrusion 15u1 welding gas Ar 80'
A, 20d/min at COO200%, wire diameter 1.2φ
, the plate thickness is 3.2 mm, and the weld length is 200 mm. In addition, the ultrasonic frequency used in this example is 1QKHz,
Ultrasonic output is 1! It is.

[Other Examples]

In the above embodiments, the ultrasonic oscillator was built into the welding torch 2, but in other embodiments, the
As shown in the figure, the welding wire 1 extending behind the welding torch 2 may be provided in contact with the welding wire 1 via a wire guide 3 existing around the welding wire 1 .

〔Effect of the invention〕

According to the spatter prevention method in consumable electrode type arc welding of the present invention, it is possible to effectively prevent the occurrence of star ivy even in the welding current delta frequency range where the occurrence of star ivy could not be prevented conventionally.

[Brief explanation of the drawing]

FIG. 1 shows a welding torch f for showing one embodiment of the present invention.
T! A sectional view, FIG. 2 is a rear view of a welding torch showing another embodiment, and FIG. S is a graph for comparing the embodiment of FIG. 1 with the conventional example. 1... Welding wire, 2... Welding torch, 3...
...Wire guide, 4...Contact chiller, 5
...Welding nozzle, 6...Welding gas, 7...
Ultrasonic oscillator. Agent Tatsu Unuma Figure 1

Claims (1)

[Claims] A method for preventing spatter in consumable electrode arc welding, the method comprising: preventing the generation of spatter during welding work by applying ultrasonic vibration to a welding wire supplied as a consumable electrode.