Stranded wire vs solid for diode connections

[tundrawolf]

Hello, I have a 110 volt welder that I am replacing the diodes and heatsink on. Really I am putting heavier duty diodes, thick, finned heat sinks and a fan, in the welder, I am re engineering it. I am using 10 gauge wire to wire the assembly together. I tried using solid core wire and due to the proximity and lack of flex, I tore the entire diode housing in half. So I am wondering what the drawbacks, if any, are with using stranded wire for the diode connections.