Patent ID: 7648856

Claim:
A method for forming a microelectronic assembly, comprising: attaching a microfeature die and a support member by: attaching a volume of solder to at least one of the microfeature die and the support member by changing a phase of the solder; contacting the solder with the other of the microfeature die and the support member; providing a first bond between the microfeature die and the support member via the solder by urging the microfeature die and the support member toward each other to form a tack weld with an urging force from about 0.02 Nt. to about 0.1 Nt. while the solder is at an elevated temperature from about 150° C. to about 180° C. and below a melting point of the solder; and providing a second bond between the microfeature die and the support member by changing a phase of the solder, the second bond being stronger than the first bond.