Arc welding device

Claim 1

AN ARC WELDING GUN FOR USE IN WELDING A WORKPIECE HAVING A DEEP NARROW RECESS, COMPRISING AN ELONGATED NARROW HOUSING DIMENSIONED TO FIT EDGEWISE WITHIN SAID RECESS AND ADAPTED TO BE MOVED LONTITUDINALLY THEREALONG, SAID HOUSING HAVING A LENGTH AND HEIGHT SUBSTANTIALLY GREATER THAN ITS WIDTH, A TUBULAR GUIDE EXTENDING EDGEWISE THROUGH THE CENTER PORTION OF SAID HOUSING, MEANS FOR ELECTRICALLY INSULATING SAID GUIDE FROM SAID HOUSING, SAID GUIDE BEING ADAPTED TO SUPPORT A LENGTH OF CONSUMABLE ELECTRODE WIRE EXTENDING COAXIALLY THERETHROUGH AND HAVING ITS FREE END PROJECTING FORM ONE EDGE OF SAID HOUSING FOR CONTACT WITH SAID WORKPIECE, MEANS FOR CONNECTING SAID WIRE TO AN ELECTRICAL POWER SOURCE, WALLS WITHIN SAID HOUSING DEFINING A GAS PASSAGE ABOUT SAID GUIDE AND ALONG THE LENGTH THEREOF, SAID GAS PASSAGE BEING OPEN AT THE FREE END OF SAID GUIDE, MEANS FOR CONNECTING SAID GAS PASSAGE TO A SOURCE OF INERT GAS, SAID WALLS FURTHER DEFINING A LIQUID PASSAGE EXTENDING IN SPACED PARALLEL RELATION TO SAID GUIDE FORWARDLY AND REARWARDLY THEREOF, EACH OF SAID LIQUID PASSAGES DEFINING A DOUBLE PASS SYSTEM ALONG THE LENGTH OF SAID GAS PASSAGE WITH ONE PORTION EXTENDING LENGTHWISE OF THE GAS PASSAGE IN ONE DIRECTION AND ANOTHER PORTION EXTENDING IN THE REVERSE DIRECTION, AND MEANS FOR CONNECTING SAID LIQUID PASSAGE TO A SOURCE OF LIQUID COOLING MEDIUM, SAID GUN BEING SUBSTANTIALLY UNIFORM THICKNESS THROUGHOUT.