Methods for friction stir welding involving dissimilar materials

A method, comprising:

• bonding a first material within a groove of a second material using first friction stir welding;
• removing an upper portion of the first material opposite the second material from the groove, the removed upper portion leaving a vacant portion of the groove;
• placing a third material upon the second material and over the groove, wherein the second and third materials are materials of different composition having different melting points;
• and
• using second friction stir welding to heat a mixture of the first material and the second material formed using the first friction stir welding to a temperature sufficient to plasticize and form a bond between the mixture of the first and second materials, and the third material.