Hello all, this is my 1st post here. I'. A fairly new welder, I've only done little bits of patching before I tried to upload a picture, as I keep getting what looks like hollow welds. (Ignore the paint as I had to coat it as I have to leave it for a few days) Im welding outside using a Clarke 100 e mig with argon/co2 gas. I spent ages cleaning the metal before hand and made sure it was a good fit but I keep getting these hollow type welds . Can anybody offer any insight for me.