Sinking weld pools!
I think I've got the current set too high. Look at this =>
This has happened a couple of times to me now. It is really quite a strange experience.
The electrode is kind of moving along as you'd expect it to - this sounds like an outer body experience and in a way it is! I'm concentrating with my eyes to make sure the spark is the right length, whilst kind of letting my arm deal with the weave or stitching effect as well as the progress from left to right along the butt joint. So for me anyway eyes are kind of the more conscious part of the process... You can see the spark working as it should - melting the metal - nice deeper red coloured weld pool of molten metal - brighter yellow molten slag around it...
...when all of a sudden the healthy spark kind of splutters and the whole process stalls. This happens with a kind of more hollow sounding change in sound. Before you get to this stage; the welding process sounds more like it is a ringing sound on tight metal but as the weld sinks the sound changes to the hollow sound. If you ignore it and don't stop you get a hole (see previous 2 posts). This time I stopped in time to get the effect you can see above.
This is what it looks like on the underside
