Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1998-06-15
2000-03-14
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
B23K 9167
Patent
active
060375574
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The invention pertains to a gas lens housing for arc welding or cutting torches, to be specific WIG-Torches, with a torch body with a housing for securing an electrode holder, which can have collet chucks with expansion slit as clamping fixture for the electrode in a frontal downstream section, where a ring channel is created as a protection channel between the electrode holder and a housing jacket of the housing and with a gas lens attached to this ring channel.
Gas lens housings or gas lenses of that variety are designed at the exit of the protection channel of an arc welding or cutting torch, so that the inert gas can exit the torch in a laminar flow, surround or cover the electrode and in this condition reach the welding site without being mixed with the atmospheric air. The gas lenses could be e.g. of sintered metal plates, as those described in DE-GM 84 05 922, or it can also be of pressed steel wool or metal wire mesh sieve.
In torches of the initially mentioned type, the gas lenses are fastened within a gas lens housing, in which for instance the sintered metal plates or the fine wire mesh sieves are secured on the guide pipe with a retainer ring, as is described in DE-AS 1 295 328. It is also possible to fasten the sintered metal plate to the guide pipe by heading the outer end. Such an arrangement is described for instance in DE 37 28 185 A1.
Furthermore, it is already common to screw or solder the gas lens housing to the adapter sleeve housing of the torch.
Generally, the gas lens contains a center bore, which is pushed over the front end of the adapter sleeve housing or the collet chuck of the electrode holder. A disadvantage in this familiar arrangement is, for instance, that, when spray or beads of weld form at the front end of the electrode and the gas jet has to be changed, the gas lens or sections of it tend to stick to those sprays or beads on the electrode, and there is danger of damaging the gas lens or the gas jet.
Contrary to this, the invention has the objective to further the design of the initially mentioned gas lens housing with attached collet chuck in such a manner, that a trouble free exchange of the gas jet is possible and, according to a side aspect of the invention, an optimal atmosphere for the inert gas is created in the area of the electrode.
The objective of the invention is further met by the fact, that the gas lens housing is affixed with play at the front end of the electrode holder.
Because of this measure it is possible to securely fasten the contracting collet chuck of the electrode holder in radial direction, while still fastening the gas lens housing securely to the electrode holder. If during the welding, sprays or beads of weld have gathered on the front end of the electrode, just a torch cap of the torch body has to be loosened, which also loosens the clamping holder of the electrode by the collet chuck, so that the electrode can be removed from the electrode holder without problem. Because the electrode can be simply removed from the frontal downstream section of the electrode holder when the collet chuck is loosened, the danger of damaging the gas lens is safely avoided. Moreover, according to the invention, the fastening of the gas lens housing to the front end of the electrode holder does not diminish the function of the collet chuck to fasten the electrode.
An advantageous development of the invention determines that the gas lens housing can turn around the longitudinal axis of the electrode holder and is possibly held to the electrode holder with low axial play. This ensures an exact alignment and fastening of the collet chuck, which especially tends to move in radial direction when clamping tight the electrode, even though these collet chucks assume additionally the function of fastening the gas lens housing.
A further advantageous further development of the invention determines for the electrode holder or the collet chuck to have protuberances like a kind of ring flange directed radially to the outside, while the electrode holder is stuck
REFERENCES:
patent: 3053968 (1962-09-01), Gorman et al.
patent: 3180967 (1965-04-01), Hill
patent: 4788401 (1988-11-01), Kleppen
patent: 5393949 (1995-02-01), Stricklen
patent: 5556550 (1996-09-01), Fyffe
Alexander Binzel GmbH & Co KG
Shaw Clifford C.
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