Pureshield is for welding stainless and ally. Not for mild steel.
Well i never knew that, i've been using it for years. It's worked ok but i suppose i could have got better results with a different gas.
I googled it and found this,
"When MIG-welding ferrous materials, pure argon is not an ideal shielding gas, as it produces an arc with poor cathodic rooting characteristics, large droplet size and therefore higher levels of spatter. For this reason, BOC Industrial recommends that"
Geoff