Hi! An excellent topic you have here.. :)
I'm thinking to build a CD welder too, with these MOSFETs:
IRLS3036-7PPbF
http://www.irf.com/product-info/datasheets/data/irls3036-7ppbf.pdf
I just can't figure out how many of those I will need.. :?
I was thinking to use something like 0.5F & 48V...