Electric heating – Metal heating – Nonatmospheric environment at hot spot
Patent
1991-12-10
1993-04-27
Shaw, Clifford C.
Electric heating
Metal heating
Nonatmospheric environment at hot spot
219136, 219138, B23K 9167
Patent
active
052064727
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a system for use in alternately electrode welding and gas/arc welding (TIG-welding).
In conventional electrode welding, electric current is employed for fusing of a fusion electrode which is secured in an electrode-carrying head. Preferably, the fixing of the fusion electrode or the release of the fusion electrode is effected by screwing of a handle with an associated current conductor relative to the fusion electrode and an associated fastening head. When the fusion electrode is consumed, it is replaced with a new electrode by screwing the handle with the current conductor relative to the electrode-carrying head.
In gas/arc welding (TIG-welding) special TIG-equipment is employed which comprises a burner with an associated (argon) gas conduit from a source of gas and an electrode holder having a tungsten electrode and associated current cable from a source of supply. Hitherto, a combined holder for the burner and the electrode and a common conduit for the argon gas and the current cable have been employed. In conventional electrode welding, current cables are most often employed which are extendable by means of cable joints. It is also possible to employ equivalent, but more complicated and expensive joints for the common conduit for the argon gas and the current cable in TIG-welding. Argon gas is non-combustible.
U.S. Pat. No. 3,263,055 describes an arc welding apparatus including a torch, an inert gas conduit in the torch and a non-consumable electrode in the conduit. The torch is gripped in the jaws of a stick electric holder by the operator in order to perform a welding operation on a workpiece. In addition, the control valve is provided for regulating the inert gas supplied to the electrode.
Hitherto, it has been usual to employ separate equipment for electrode welding and gas/arc welding respectively. In practice, it has been cumbersome to employ two separate sets of equipment for conventional electrode welding and for TIG-welding. In addition, large costs are involved in having to invest and maintain two separate sets of equipment for one and the same user at different locations of use.
U.S. Pat. No. 3,739,140 describes a combination welding torch for use in alternate electrode welding and gas/arc welding (TIG-welding). The torch includes a current supply cable and a gas conduit in connection with a holder having an associated electrode-carrying head. An electrode is to be firmly clamped with an adjustable gripping engagement between the head and a current conductor member to which the head is firmly clamped. The holder with an associated current conductor member is surrounded by a handle and the holder with the associated conductor member is common for exchangeable first and second electrode-carrying heads. The first head serves to secure a welding electrode for electrode welding while the second head serves to secure an arc electrode for gas/arc welding while also forming a support for a coupling member for coupling to a gas conduit. In this construction, however, selecting one or the other of the electrodes involves shifting a number of separate, rather small and tiny parts in succession. This shifting operation may involve complications for an operator, especially at unshielded outdoor working locations.
Accordingly, it is an object of the invention to provide a combination electrode welding and gas/arc welding apparatus which can be used in electrode welding and in TIG-welding by simply switching an electrode holder head.
It is another object of the invention to use a common arrangement of current supplied cables for purposes of electrode welding and gas/arc welding.
It is another object of the invention to be able to employ arbitrarily long and especially robust current supply cables for a combination welding torch.
It is another object of the invention to be able to readily switch from a conventional electrode welding apparatus to a TIG-welding apparatus by a simple exchange of components in a common holder.
Briefly, the invention provides the combination of a
REFERENCES:
patent: 3116406 (1963-12-01), Barnes
patent: 3263055 (1966-07-01), Broderick et al.
patent: 3557337 (1971-01-01), Sipos et al.
patent: 3739140 (1973-06-01), Rotilio
patent: 4142086 (1979-02-01), Rotilio
Myking Reidar
Vetas Oystein
Hand Francis C.
Shaw Clifford C.
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