Now you seem to have bad undercutting on the weld, might be a touch too hot, to fast travel speed (doesnt look like it tho) or need to bump up the wire feed.
Also may have a improper torch angle to the work piece/joint
Last edited by WolfMetalFab; 02-18-2007 at 04:53 AM.
Reason: added info
The first weld shown has improper fusion, try cleaning the material well and pause longer at the edges of the weld pool. The second weld has underfill like someone said, if the depth of preperation is to deep for one pass try to clean the weld and put a cover pass on it. The way to tell if travel speed is to fast is the weld apperence has a "feathering" look. enjoy