Never buy a product from e-bay. Most of companies sell very light duty welding machines and make foolish non technical persons by providing confusing data and not specify duty cycle for maximum current. You can not do your work with 10% duty rated product. If you buy a 10% duty cycle product it...
Wrong data on machine
Your machine is a simple transformer type welding machine, it may be of 6KW but it's KVA that shows the current taken by machine will be 10 to 12 KVA because these type of machines have poor power factor due to their regulator type design, see big knove (item to adjust...
Normally 99.9% copper is used for spot welding, but for large scale production chromium zirconium copper is used ( Cu-Cr-Zr). It has more hardness (83B rockwell) and much higher annealing temperature around 500 degree centigrade as compared to pure cooper which is 200 degree centigrade. For...