Electric heating – Metal heating – By arc
Patent
1982-04-26
1985-08-06
Albritton, C. L.
Electric heating
Metal heating
By arc
21913763, 339 16R, 339 91R, B23K 928, B23K 902
Patent
active
045338167
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an electric welding gun with a rotary torch head.
In addition to a welding electrode positioned on the rotary torch head and connected to a welding lead, such welding guns generally have an inert gas nozzle connected to an inert gas line, a liquid cooling of the welding head with a liquid feed line and a liquid return line, a controllable drive motor for the welding head and frequently a filler wire reel with a separate wire feed motor positioned on a reel holder rotatable with the driving shaft of the welding head about its rotary axis and supplied and controlled by corresponding control lines. The inert gas, the cooling water, the welding current and other feed and control currents for electrically driving auxiliary devices rotatable with the torch head must therefore be transferred via corresponding distributors from the fixed casing of the welding gun to the rotor carrying the torch head and the auxiliary devices rotatable with it.
From DOS No. 2,723,034, it is known to transfer the welding current from the boss, made from electrically conductive material of the driving shaft carrying the torch head to the latter by means of driving shaft ball bearings running in a mercury bath. This is intended to provide a constant, low current passage resistance, so that, even in the case of high current intensities, the welding current level is kept constant during welding. However, on the one hand the mercury bath increases the resistance to rolling of the ball bearings and on the other hand, in order to protect both the environment and the worker, it is necessary to take expensive measures for sealing the areas containing the mercury and the mercury line into the welding gun.
In addition, in the known welding guns, the distributor ring chambers for the inert gas and cooling water are sealed by 0-rings arranged in internal slots of the hub of the driving shaft of the torch head and rests in sliding manner on said shaft. However, for a good, permanent and wear-resistant sealing of the gas and liquid distributors of a welding gun, O-rings, which are mainly intended for sealing parts which are not movable relative to one another, are disadvantageous, even if the speed of the torch head and its driving shaft is low. If, in addition, the driving shaft is made from a relatively soft light metal alloy, running grooves form in the shaft due to friction on the points of the O-rings.
The supply lines for the torch head and its auxiliary devices are combined into a welding cable and are jointly introduced into and removed from the welding gun and in the gun casing are connected to the associated supply distributors. If welding is carried out with the welding gun, e.g. at a building site, the welding cable can be damaged by site traffic. In these cases, it is advantageous if the damaged welding cable can be replaced as swiftly and rapidly as possible by another welding cable. For this purpose, it is necessary to arrange the supply line terminals and connections on the welding gun so as to give optimum easy access, thereby permitting rapid removal and replacement. It is also desirable to be able to simply and rapidly produce or detach the supply line connections with respect to the welding gun in cases such as e.g. the internal welding of a container, so that the welding gun can be passed through the man hole into the container without the welding cable, followed by connection to the latter in the container.
An object of the invention is to so construct an electric welding gun with a rotary torch head that a good current transfer to the driving shaft of the torch head, accompanied by a limited, constant transfer resistance and a good sealing of the gas and liquid distributor for transferring the cooling fluid and inert gas to the rotary torch head are ensured.
A further object of the invention is to so construct an electric welding gun with a rotary torch head that it is easily and rapidly possible to produce and remove the line connections between the gun and the welding cable containing the supply li
REFERENCES:
patent: 3185148 (1965-05-01), Gaylord
patent: 3196249 (1965-04-01), Thostrup
patent: 3345494 (1967-10-01), Apblett et al.
patent: 3493716 (1970-02-01), Martin
patent: 3673541 (1972-06-01), Volinskie
patent: 4142084 (1979-02-01), Torrani
Geiss Josef
Reeh Holger
Albritton C. L.
Sigda Catherine M.
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