Too much wire is often the cause, or not a particularly smooth output characteristic from the machine. Gas should be around 10 lpm on a 150 torch.
Well all sorted, i just removed the crappy strap and fitted a car battery lead inplace, bit bulky but does the job untill i can sot a braid strap for it, i can now once again SORT of weld)))
Earth clamps are semi consumables anyway. They have a hard life and need to be replaced sometimes.
You need to get out more!It has a kind of gothic beauty.