I’ve had an intermittent weld porosity on both flat and horizontal welds. What’s the normal check list for correcting it ? A few have been torch angle and one was definitely the tip and nozzle need a clean but I’ve corrected these. The picture is a three inch weld starting between tacks and finishing on a previous weld. Area was cleaned to bright before hand and was done after a good weld on the opposite side of identical nature.