TORCHE POUR LE SOUDAGE A L'ARC SOUS ATMOSPHERE NEUTRE

L'INVENTION CONCERNE UN PISTOLET DE SOUDAGE 10.LE PISTOLET COMPREND UN ELEMENT TUBULAIRE METALLIQUE 12 DANS LEQUEL PEUVENT PASSER UN FIL DE SOUDAGE 18 ET UN GAZ PROTECTEUR ET A UNE EXTREMITE DUQUEL EST MONTE UN DIFFUSEUR DE GAZ 22, CE DIFFUSEUR 22 COMPORTANT UNE PREMIERE PARTIE TUBULAIRE DELIMITANT UNE CHAMBRE DE RECEPTION DE FIL ET DE GAZ AINSI QU'UNE SECONDE PARTIE TUBULAIRE DE DIAMETRE INFERIEUR A LA PREMIERE ET POURVUE D'UNE OUVERTURE SUPPORTANT UN EMBOUT 24 DE SORTIE DE FIL DE SOUDAGE; UNE BUSE TUBULAIRE 28 EST MONTEE PAR UNE EXTREMITE SUR LA PREMIERE PARTIE TUBULAIRE DU DIFFUSEUR ET COMPORTE UNE EXTREMITE OUVERTE DEPASSANT LONGITUDINALEMENT DE L'EMBOUT 24, PLUSIEURS PASSAGES 54 INCLINES AXIALEMENT ETANT MENAGES DANS LES PARTIES TUBULAIRES DU DIFFUSEUR, CES PASSAGES 54 ETANT INCLINES PAR RAPPORT A L'AXE DU DIFFUSEUR D'UN ANGLE COMPRIS ENTRE 10 ET 20 ET EN OUTRE UN CONDUIT D'EAU DE REFROIDISSEMENT ETANT PLACE SUR L'EXTERIEUR DE L'ELEMENT TUBULAIRE ET COMPORTANT UNE PARTIE PLACEE A PROXIMITE DU DIFFUSEUR. A welding wire gun operable in the high temperature environment of a high current density welding system. The welding gun includes a tubular member through which welding wire and shielding gas are adapted to pass. A gas diffuser member is mounted upon one end of the tubular member and, in turn, supports a welding tip therein such that the end of the welding tip projects beyond the diffuser in the direction of the joint to be welded. Additionally, the welding gun is constructed to provide for flowing of a coolant material around the tubular member proximate the diffuser member for maintaining the welding tip below its melting or distortion temperature. A tubular nozzle member is supported at one end from the diffuser member and extends beyond both the diffuser member and the welding tip in such a way as to define an annular shielding gas chamber about the diffuser and welding tip. Gas passages formed through the diffuser communicate with the annular gas chamber and are angularly oriented with the central axis of the diffuser and welding tip so as to maximize the velocity and minimize turbulence of the gas flow through the gun to thereby maintain a high energy shielding gas envelope around the welding wire and weld puddle.