It would be handy to have a small and portable spot welder that could be used for odd jobs such as fabricating storage boxes, enclosures, guards, etc. 1+1mm would be fine. 13a plug preferred, but 16a could be sorted. I've seen a few second hand units for sale £100 - £200 but as I've never used a spot welder I'm unsure whether they'd be disappointing junk. Could anyone give me a few pointers, or maybe even suggest giving them a wide berth at this price point? Thanks.