Friction stir weld tools configured to bond or laminate thin sheets. Friction stir weld tools have a first shoulder, a pin extending from a friction surface of the first shoulder, and a second shoulder. In some embodiments, the second shoulder is secured at least partially around the first shoulder and includes an engagement surface longitudinally recessed with respect to the friction surface of the first shoulder. In additional embodiments, the second shoulder is proximate the first shoulder and rotationally fixed. In yet additional embodiments, the pin has a diameter that is greater than the height of the pin and the second shoulder is secured at least partially around the first shoulder. Methods include manufacturing such friction stir weld tools. Methods include friction stir welding using such tools.
 The United States Government has certain rights in this invention pursuant to Contract No. DE-AC07-05-ID14517 between the United States Department of Energy and Battelle Energy Alliance, LLC.