A friction stir welding tool and method for forming a friction stir weld joint includes a rotatable body having a rotatable shoulder for maintaining surface contact and maintaining plunge depth and a rotatable pin extending from the rotatable shoulder. The rotatable pin is integrally formed with the rotatable shoulder. The tool further includes a stationary body annularly disposed around the rotatable body. The stationary body has a stationary shoulder annularly disposed around the rotatable shoulder for further maintaining surface contact and managing plunge depth.