The power frequencytransformer is independently developed on the basis of introducing anddigesting advanced similar products from Europe. The series of weldingtransformers are made of high-quality silicon steel sheets and use integralstamping process. The primary coil, the secondary coil and the silicon steelsheets generally are made by the advanced vacuum epoxy resin pouring process,which has the advantages of strong insulation, high temperature resistance, lowtemperature rise, light weight, small volume, fast heat dissipation, safety anddurability, etc.