Welding process of keyhole-free stirring and friction welding

The stirring friction welding process without spoon pore includes the following steps: grinding and stirring with the stirring head along the butt joint of welded body to form weld seam; adhering one filling block with one surface fitting the welded body to the weld seam in the welded body in some time after beginning welding; moving the stirring head along the outer profile of the filling block until the probe of the stirring head is separated from the welded body; and finally eliminating the filling block mechanically. The said process results in no spoon pore and is simple, practical and low in cost compared with available technology.