The dimples on the middle of every spot is an indicator that it was done by pumping the trigger.
I was surprised when I saw the welds on my driveshaft from a respected name on this board look like this. Not the typical smooth Mig on a lathe work you see from a typical shop. Thought maybe it was Tig but now I guess its' Tack-Tack ???? Seems to work well in this application though. I should crawl under and get a pic but you all have seen it anyway and it looks like this:
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