Automatic arc welder

Claim 1

An automatic arc welder capable of performing various types of weldings such as non-positioned fillet welding, horizontal welding and flat positioned welding, through continuous feeding of electrode wire extracted from a wire drum onto a joint formed between two metal plates, said automatic arc welder comprising; a. a carrier member having means for traveling said carrier member along the joint; b. a first bracket mounted on said carrier member, said first bracket having formed therein a support at an end portion thereof; c. a second bracket having formed therein a coupling member for rotatably coupling said second bracket onto said support of said first bracket for rotating the second bracket on an imaginary plane perpendicular to the movement of the carrier member; d. a first clamping means for tightly clamping said second bracket with respect to said first bracket at a predetermined rotated position; e. a welding unit including an electrode wire feeding member for continuously feeding electrode wire extracted from the wire drum and a welding torch for guiding a tip end of said electrode wire towards an end of and further outside of said welding torch, said welding unit rotatably supported with respect to said second bracket on said imaginary plane for changing directing direction of said welding torch; and f. a second clamping means for tightly clamping said welding unit with respect to said second bracket at predetermined rotated position, whereby tip end of said welding torch, upon rotation of said second bracket into said first described predetermined position with respect to said first bracket and upon rotation of said welding unit into said latter described predetermined position with respect to said second bracket, can be positioned adjacent to said joint and can be directed towards the joint for effecting said various types of weldings.