In order to weld pieces of 6mm steel you can use any type of welder. Depending on how strong and how pretty the weld needs to be will determine the type of welder you choose.
3.85
6mm
No
I use 6mm for 6mm, but if you don't have a metric set, 1/4 inch is only very slightly bigger.
6mm
6mm
6mm are the best for it.
less than 6mm
6mm
6mm (millimeters)
6mm
how many steel bar in one ton