... they are able to touch the tip anywhere repair 8. Pure metal repair, no traces of welding, welding effect meet quality ... Stainless steel. Tool steel. Cast iron casting. BRAZE cast aluminum. Nickel. Magnesium alloy. Aluminum and copper all conductive metal. electrode material ... SKD61 / Steel welding sticks of 700 T (pure nickel) / mime-iron welding sticks 750 T (half-nickel) / P20/C-1720/CU63A2/S7 / and ...