How can we weld pig iron with electric welding?
Welding cold welding and heat welding of cast iron. Hot welding process: preheating 600 - 700 degrees before welding, welding process shall not be less than 600 degrees. [choose big diameter welding rod and big current density], slow cooling after welding. Cold welding process: the small diameter electrode and small current linear operation, each weld length is less than 15MM, the welding temperature is not hot to prevail.
With DC welding machine, with cast iron welding rod, the current slightly increased
Pig iron itself is not easy to weld the material, welding before heating, welding process and after welding to heat preservation, during the period, but also gently tap around the weld, to eliminate internal stress, it is best to use carbon steel welding seam.
