I’ve had very good results with a Miller 220v spot welder. The harbor freight and other import welders look like it, but this unit is able to produce very good and pretty authentic spot welds. I dont have a timer, so i have to test before to get down exactly how long to energize it,but other than that, after getting the tips the right foot print, they look pretty factory. Not really cheap unit, though. I think it was about 750 10 years ago