You have the great ability to find the words I cannot, thanks for the explanation.It's the oxide. You don't get any cleaning of the arc on the backside of the weld
I agree with you. In the video, you can see that the phenomenon does not occur in the area which was tack-welded before and cleaned after welding.It's the oxide. You don't get any cleaning of the arc on the backside of the weld
That's nonsense, it's literally the oxide film which melts at considerably more than aluminium, floating to the skin of the molten puddle. Like slag or dross in a furnace/crucible.I agree with you. In the video, you can see that the phenomenon does not occur in the area which was tack-welded before and cleaned after welding.
What do you think about RT? Is it possible to see this line on radiogram? My RT team, after observing the photos, pointed this out as a nonconformity - a lack of penetration.