Hi,thanks again for all replies,I finally got around to taking it apart to have a closer look and found that what I was originally looking at on top (that I thought were primary windings) were in fact two big capacitors which are connected in parallel,after lifting these capacitors off I could see the primary winding which is only one big winding and it has two phase connected across it (ie 400 volts) there is no neutral , the original old plug was a three phase and earth,but only had two phases coming in from the plug.
so anyway it looks like I can't really do much except connect it to 230v and see if I have a hot enough arc to weld maybe,
I think trying to boost my voltage is probably not feasible