Welding torch

A torch, particularly a metal inert gas welding torch, comprising a torch housing having a front end portion provided with an opening adapted to face towards an object to be treated;

• means for creating at said opening requisite heat for operation of the torch with concomitant development of fumes at said front end portion of the housing;
• elongated hermetically closed heat transmitting means confined in its entirety within the housing for automatically transporting heat from a heat receiving zone which is adjacent said front end portion to a heat releasing zone which is rearwardly spaced from said heat receiving zone;
• and means for so circulating a cooling medium through said housing as to both cool said front end portion of the housing and remove the fumes by action of said cooling medium, said circulating means including a chamber located substantially at said heat receiving zone and having an outlet, passage means having first inlet means for introducing the cooling medium into the housing adjacent said heat releasing zone and extending in directions towards said heat receiving zone and Venturi means communicating with said chamber so that the cooling medium passes through said passage means cooling the housing at least at said heat releasing zone and thereupon passes through said chamber in which it creates suction before leaving the chamber through said outlet, said circulating means further including channel means having second inlet means at said opening and extending in direction towards and open into said chamber adjacent to said Venturi means so that, due to the suction created during movement of the cooling medium through said chamber the cooling medium aspirates fumes from said second inlet means and through said channel means towards said outlet of said passage means and out of said housing.

A torch, comprising a torch housing having a front end portion provided with an opening adapted to face towards an object to be treated, means for creating at said opening requisite heat for operation of the torch with concomitant development of fumes and heat at said front end portion of the housing;

• elongated hermetically closed heat transmitting means confined in its entirety within the housing for automatically transporting heat from a heat receiving zone which is adjacent said front end portion to a heat releasing zone which is rearwardly spaced from said heat receiving zone;
• and means for so circulating a cooling medium through said housing as to both cool said front end portion of the housing and remove the fumes by the action of said cooling medium, said circulating means including a chamber in said housing adjacent said heat receiving zone, and having a chamber outlet, channel means having one end open outwardly away from said front end portion of the housing and to the exterior thereof and another end communicating with said chamber, passage means having an inlet for introducing the cooling medium into the housing adjacent said heat releasing zone and having one portion extending in direction towards said heat receiving zone and another portion extending from said one portion counter to said direction and having a convergent outlet opening into said chamber so that the cooling medium, after passing through said one portion and cooling the housing at least at said heat releasing zone and thereafter exiting said outlet into said chamber, creates therein an area of reduced pressure before leaving said chamber through said chamber outlet, whereby fumes become aspirated into said chamber through said channel means due to said reduced pressure in said chamber to become mixed with and entrained by said cooling medium flowing in said chamber towards and out of said chamber outlet.