Gouging wire electrode

Details Gouging wire electrode Gouging wire electrode

1984-04-06

1985-11-12

Envall, Jr., Roy N.

Electric heating

Metal heating

Weld rod composition

219 69W, 21914631, B23K 35368

Patent

active

045530190

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a gouging wire electrode used for grooving workpiece metal by producing an electric arc between an electrode rod and the workpiece metal to heat and melt part of the workpiece metal, and blowing compressed air against the part to blow off molten metal.


BACKGROUND ART

Gouging electrode rods heretofore used are formed by sintering carbon to provide a length of rod and plating the rod surface with copper or flame-spraying the rod surface with aluminum. Since such electrode rods are limited in length, continuous gouging operation requires frequent exchange and hence the efficiency is low. Further, shortened electrode rods account for a loss of about 15%. On the other hand, various types of connectable carbon electrode rods have been proposed, but they have drawbacks that connection takes time and that the gouged groove configuration varies at the connection.
Thus, various types of wirelike electrode rods intended to elminate these drawbacks have been devised.
Among the conventional gouging wires, a typical one is in the form of a filler section serving as an electrode material wrapped in a shell which is a hoop of metal such as iron or stainless steel. As for the composition of said filler section, usually it consists mainly of carbon with suitable amounts of binder and stabilizing agent added thereto.
This type of gouging wire electrode, as compared with the aforesaid gouging carbon electrode rod, has the following drawbacks.
(1) The stability of arcs during discharge is poor. That is, since arcs can hardly be produced continuously, it is impossible to obtain a uniform gouged groove.
(2) Since the rod is consumed so rapidly that it can hardly be treated by hand, requiring an automatic machine. Further, it is comparatively high in cost.


DISCLOSURE OF INVENTION

A gouging wire electrode according to the present invention comprises a metal shell, and a powdery or particulate filler section consisting mainly of carbon and packed into said metal shell, said filler being composed of 80-95% by weight of carbon and 5-20% by weight of thermosetting resin binder, said filler has a bulk density of 1.2-1.7 g/cm.sup.3 and a cross-sectional area which is 60-90% of the total cross-sectional area of the wire.
To said filler, there may be added an arc stabilizing agent, as needed, within the range of not more than 10% by weight.
According to this arrangement, there is obtained an economical gouging wire electrode which produces stabilized arcs during discharge and is consumed slowly, as in the case of the carbon electrode rod.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a cross-sectional view showing a structural example of a gouging wire electrode;
FIG. 2 is a longitudinal section thereof;
FIG. 3 is an external view of a wire whose binder content of the filler section is zero, said view taken after the wire is discharged; and
FIG. 4 is an external view of a wire according to the present invention, taken after it is discharged.


BEST MODE OF CARRYING OUT THE INVENTION

FIGS. 1 and 2 show a structural example of a gouging wire electrode. The numeral 1 denotes a metal shell obtained by forming a metal hoop of long strip into a pipe, and 2 denotes the overlap portion of the hoop. The numeral 3 denotes a powdery or particulate filler section wrapped in the shell 1 in the step of forming the hoop into a pipe.
The metal shell 1 is made usually of iron or stainless steel. The filler section 3 is composed of a mixture of carbon and thermosetting resin binder, with an arc stabilizing agent added thereto, if necessary.
The composition, bulk density, and cross-sectional area ratio of the filler section will now be described in detail.


(A) Composition

If the carbon content is 100%, i.e., there is no binder contained, the carbon powder or particles are scattered during electric discharge, the arcs become discontinuous, making it impossible to provide a satisfactory gouged groove and increasing the rate of consumption of the electrode to the extent of making the electrode impractica

REFERENCES:
patent: 2818352 (1957-12-01), Ludwig et al.
patent: 3345495 (1967-10-01), Quaas et al.

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