I've been welding a new rear spring mount to my car chassis. The problem I am having is the new mount is good clean metal about 2mm thick but the chassis is a lot thinner and not so clean (13 year old car metal). I'm using a clarke 90en with 0.9mm flux core wire. The first weld I tried blew a small hole in the chassis. So I tried starting the weld on the new mount and then flicking it onto the chassis. To avoid building up too much heat, I did a series of short welds, moving around a lot to distribute the heat. Laying on my back under the car does not help. The problem is that I am ending up with a weld that looks like dog poo because it's just short welds laid on top of each other. I am getting good penetration on the chassis and the new mount. Is there a better way of doing this kind of job?