Patent ID: 6609651
Filing Date: 2003-08-26
Classification: H05K

Abstract:
A method for attaching a leaded circuit component to a circuit board, the method comprising the steps of:forming a solid solder preform by mechanically combining a first solid solder alloy and a second solid solder alloy, the first solder alloy having lower liquidus and solidus temperatures than the second solder alloy; assembling the solid solder preform to a lead of the circuit component; heating the solid solder preform to a temperature above the liquidus temperature of the first solder alloy but below the liquidus temperature of the second solder alloy so that the first solder alloy melts and dissolves substantially all of the second solder alloy; and then cooling to yield a solder joint having a substantially homogenous composition, the solder joint bonding the lead to the circuit board.