JPS58378A - Plasma jet welding and cutting method - Google Patents

Abstract

PURPOSE:To improve the efficiency in welding and cutting by charging a working gas electrostatically beforehand and creating a magnetic field in a specific direction in an ejection port for said gas thereby focusing plasma jet flow. CONSTITUTION:The plasma jet 6 generated between a nozzle 2 and an electrode 1 in the inside thereof is ejected by an electric power source 3 toward the work 4, by which the work 4 is welded or cut. A working gas such as Ar is ejected through the ejection port of the nozzle 2 and an easy ionizing agent such as KOH is put therein to form a jet 6 contg. cations. Further, a circular electromagnet 5 is fixed to the leading end of the nozzle 2 around the jet 6 in such a way as to assume a clockwise circle when viewed from, for example, above. The electrode 1 is wired to negative and the nozzle 2 to positive. Then, an electric field 6 other than the throttling effect and thermal pinching effect by the ejection port of the nozzle 2 act upon the jet 6 contg. cations and the forces toward the center of the jet 6 act on the circumference; therefore, the jet 6 focuses thoroughly to a circular shape of a small section before it arrives at the work 4.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a method for focusing plasma jet #1 in plasma jet welding and cutting.□ Goods Majet Welding! I or plasma jet cutting is carried out as shown in Figure 1-1. In other words, a power source 3 is connected to the nozzle 2 and an electrode l provided inside the scissor nozzle 2, and a power source 3 is connected between the electrode l and the nozzle 2. The underarm workpiece 4 is welded or cut by ejecting the generated plasma jet 61 toward the workpiece 4. Melt I1
．． In both cases of cutting, Gutsuzu i Jet Gei uses nozzle 2.
Since it spreads after passing through it, the following methods have been conventionally used to suppress this.

In other words, the effect of throttling by the ejection hole of the nozzle 2 or the operating gas such as argon, helium, air, etc.
The plasma jet 60 is guided through the interior of the nozzle 2 as shown by the double arrow, and is focused by the thermal pinch effect of cooling the plasma jet 6t from the outside.

However, in this method based on the thermal pinch effect, the nozzle kk
Since the plasma jet flow depends only on inertia, the plasma jet will spread out when the machining workpiece surface mtc, 1A is different, and there will be no convergence effect. Therefore, heating am, the heat density decreases, and melt! 1. Poor cutting processing and performance.

Therefore, the present invention eliminates these drawbacks, sufficiently focuses the plasma jet, and performs efficient welding.

A method capable of cutting is provided, the structure of which is: Fi, the working gas is electrified in advance, and the charged working gas is spouted from the spout at right angles to the jetting direction of the scissors working gas. It is characterized by focusing the plasma jet flow by creating a magnetic field tube directed in the direction.

Hereinafter, the present invention #J will be explained in detail based on an embodiment shown in the drawings.

The method according to the present invention includes cations contained in the working gas, and a magnetic field t in a direction perpendicular to the direction in which the charged working gas is ejected, thereby regulating the ejecting direction of the working dregs;
Thereby the plasma is focused. Since the present invention is a -St improvement of the conventional plasma jet welding and cutting method, the same parts are denoted by the same reference numerals. Among the working gases conventionally used: KtOH.

An easily ionizable agent such as K, 00s, etc. is added, and the operating debris is ejected from the nozzle 2 as shown in FIG. A magnetic field 7t is created to focus the flow ◇This magnetic field 7 is ll
As shown in FIG. 4, in this embodiment, the plasma jet 6 is at the center when viewed from above, and a circular electric magnet 5t is used so as to form a right-eye circle. The electric magnet 5ij is fixed to the tip of the nozzle 2, which is the ejection port of the plasma jet 6. Then, set the electrode +11i so that electrode 1 is dove and nozzle 2 is positive.
Wire to 3.

When plasma jet welding or cutting is performed as described above, first, the 9-effect welding is performed by the spout of the nozzle 2,
Focusing is performed by the conventional thermal punch effect of the working gas, and furthermore, as a magnetic field 7 acts on the plasma jet 6 containing granite ions, a force toward the center of the plasma jet 6 acts from the surroundings, and the plasma jet 6
By the time it reaches the workpiece 4, its cross section has sufficiently converged into a small circle.

Another embodiment is shown in FIG. This is because the magnetic field 7 (see FIG. 6, fIs) having opposite directions is placed on both sides of the plasma jet 50, whereas the circular magnetic field surrounding the plasma jet d in the above embodiment is used. Others are smoked.

For this purpose, a knee water stone 5 is provided at the tip of the nozzle 2. When a force is applied from this #11 plasma jet 50, the wrinkled plasma jet S converges into a flat one-sided shape in the cutting direction. The heat density increases as the heat density reaches the surface of the workpiece 11, which is more bundled than before, and the efficiency in cutting becomes better. Local processing is possible.

[Brief explanation of the drawing]

Crane 1, 1 I2W company's plasma diet 11
．． Cut #*1 indicates the cut mW, 1K411J, 1IL6-, respectively, from the Moum arrow view in Figure 3 -1 B-1 in Koji 5Ko.
This is the arrow view. #IA-Medium, 2 is nozzle λ, aFi power source, 4#i workpiece, 5 is magnet, sFi Plas 1 jet, 7#'i magnetic field. Patent applicant: Mitsubishi Heavy Industries, Ltd. Representative Patent Attorney Shibe Mitsuishi (and 1 other person) Figure 1 1 Figure 3 Figure 2 Figure 4

Claims (1)

[Claims] Plasma jet melt 1 which focuses a plasma jet flow by pre-electrifying a working gas and creating a magnetic field in a direction perpendicular to the jetting direction of the working gas at the jet port through which the charged working gas is ejected.
．． Cutting method.