Electric heating – Metal heating – By arc
Patent
1989-08-01
1990-05-08
Shaw, Clifford C.
Electric heating
Metal heating
By arc
219136, B23K 932
Patent
active
049240668
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a device for cooling both the electrode holder for manual arc welding with coated electrodes, and the electrode as well as the electric supply cable. Cooling is effected by conducting cooling gas, preferably air, through the device.
A number of welding techniques are previously known in which, for different reasons, a gas is supplied to the welding point. For example, MIG or MAG welding is performed fully or semi-automatically with a welding gun in which a wire electrode is fed from a bobbin via a feeding mechanism. The melt and the feed of material in the electric arc are protected by an inert gas. The handle can be cooled by compressed air which is also used for driving the electrode feeding mechanism. Air must under no circumstances come into contact with the arc or the melt. Since compressed air and protective gas are supplied to the welding gun through separate conduits, no cooling is effected in accordance with the method of the present invention.
U.S. Pat. No. 2,975,267 relates to an electric welding device with air cooling in which a portion of the supply cable is surrounded by a channel through which air from the atmosphere flows, which is intended to cool the handle by discharging through the holes in the handle. Neither the electrode nor the electrode attachment is cooled by an air flow.
The present invention provides cooling of the components which, from technical aspects, are the most essential to cool, i.e. also the electrode attachment and the electrode. This is not the case in the device disclosed in U.S. Pat. No. 2,975,267. By cooling the entire cable arrangement according to the present invention, i.e. the male connection at the power source, the entire electric supply cable, the electrode holder as well as the electrode with the attachment, the area of the electric conductor can be reduced by about 30%, and the electrode holder can be reduced, for instance from 600 A to 450 A. This is not possible with the device according to U.S. Pat. No. 2,975,267. Moreover, the current intensity can be increased by about 50% as compared with the maximum current intensity recommended by the electrode manufacturer. Nor is this possible with the known device.
U.S. Pat. No. 2,935,597 relates to an electric cutting device using a carbon electrode for melting the workpiece and a vigorous air stream for blowing away the molten material. As opposed to such a vigorous air stream, the air stream from the fixing hole of the electrode according to the present patent application is relatively faint and the flow of air small, viz. in the order of 20 1/min. The air stream is sufficient to form a curtain against the welding fumes immediately underneath the electrode holder, but the air stream is so faint that it will never reach the welding point. In the device according to U.S. Pat. No. 2,935,597, the air flows in through a conduit 26 adajcent the handle 32, through the tubular member 22 and into the chamber 38 of the mounting head 37. Here, the air flow is divided into two currents one of which discharges through the hole 42 at right angles to the electrode 41 and the other of which discharges at a high velocity through the hole 44 parallel to the electrode. The air flows from the chamber 38, through the hole 42 and into the space formed by the electrode 41, the groove 40 and the ridges 39. Thus, only the circumferential surface of the electrode located between the ridges will be cooled, i.e. no more than about 25% of the circumferential surface of the electrode is cooled. Since the air discharges at a high velocity through the hole 44 which is oriented parallel to the electrode, the major portion of this air stream will flow parallel to the longitudinal direction of the electrode towards the welding point. According to the embodiment of the present invention as here presented, the electrode is retained in the fixing hole by the conical tip of the electrode pin urging the electrode into line or point contact with the opposite wall of the fixing hole. The air flows through the channe
REFERENCES:
patent: 2350614 (1944-06-01), Jackson
patent: 2692324 (1954-10-01), Strackbein et al.
Sjolund Erik
Wikstrom Rolf
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