Abstract: An automatic braze welding machine for braze welding metal elements comprising a robot, a braze welding head carried by the robot and sensor means for detecting the position of the elements to be welded and the consequent positioning of the head; the head comprises an oxyacetylene torch disposed along a first axis, means for supplying a welding alloy along a second axis convergent with the first axis, and torch displacement means, adapted to cause a reciprocating linear motion of the torch along the first axis coplanar with the axes and orthogonal to the first axis, and its inclination about the first axis.