Soldering is the most widely used electrical connection on a circuit board, however there are a drawbacks to this technology. As engineers continue to strive for innovative products, there has been an increase in using large aluminum electrolytic capacitors on PCBs. By doing so, the PCB requires heavy copper tracking that acts as a heat sink. This makes soldering more difficult, as managing the heat becomes a challenge. Additionally, when producing products in low or medium volumes, boards are typically hand-soldered which is expensive and is highly variable. Lastly, solder quality requires tight monitoring in order to prevent cold spots, voids, splatters, cracks, solder balls, and flux residue.