Welder and welding method

The invention is concerned with the equipment and the method of non-plate outside weld, it is: puts two filling blocks at the outside of the joint, the filling block connects with the knighthead, divides the knighthead into top end and bottom end, the top part revolves into the top part, the top of the knighthead connects with the filling block by the hinge, the direction and angle is changeable and forms the attrite plate of the mixing head desk at the top part, transforms angle weld with any angle into plate weld by adjusting the direction and length of the filling block knighthead, heats the angle welding line by using the friction heat creating by the filling block and the mixing head desk.