System for use in electrode welding and gas/arc welding

In combination,

• an electrode holder having a handle, a current-conducting cable extending from said handle, and a current conductor connected to said cable within said handle, said conductor having a screw-threaded portion extending outside said handle;
• a first fastening head for selectively securing a first electrode to said current conductor, said head including a first current-conducting clamping member having an internal screw thread for threading onto said current conductor of said holder and a transverse bore at one end for receiving an electrode therein for clamping between said screw-threaded portion of said current conductor and said current-conducting clamping member;
• and
• a second fastening head for selectively securing an arc electrode to said current conductor, said second fastening head including a second current-conducting clamping member having an internal screw thread for threading onto said current conductor of said holder and a transverse bore at one end for receiving an arc electrode therein for clamping between said screw-threaded portion of said current conductor and said second current-conducting clamping member, a coupling bushing for coupling with a source of gas, a gas passage extending from said bushing for conducting a flow of gas about one end of an arc electrode secured to said second clamping member, and a control valve for adjusting the flow of gas in said passage.