Picked up a new regulator today to start back back purging my steel and stainless welds. This was my first attempt on some steel roll cage tube with stainless filler. Notice how, while I didn't achieve full penetration, the inside of the pipe is free of sugaring and oxidation:
http://i3.photobucket.com/albums/y59/14biggy/Backpurge1.jpg
http://i3.photobucket.com/albums/y59/14biggy/Backpurge2.jpg
http://i3.photobucket.com/albums/y59/14biggy/Backpurge3.jpg
http://i3.photobucket.com/albums/y59/14biggy/Backpurge4.jpg
Overall pretty satisfied for my first time doing this.