Z508 cast iron electrode 
 Model: EZNiCu-1 
 Description: The nickel-copper alloy (Monel) welding core, strong graphite cast iron electrode, process and machinability are close to the Z308, but because of greater shrinkage and cracking of the poor, low strength of welded joints, not for parts of the welding force can be used to warm at room temperature or low temperature (up to 200 ℃) gray cast iron welding, can be AC and DC dual-use, stable arc, better technology 
 Uses: intensity is not high, gray cast iron welding 
 Chemical Composition of Deposited Metal /% 
 C ≤ 1 S ≤ 0.8 Mn ≤ 2.5 Fe ≤ 6 Ni 60-70 Cu 24-35 

 Z438 cast iron electrode 
 Model GB / T: EZNiFe-1 
 Description: nickel-iron alloy core graphite cast iron welding electrodes, a certain amount of ball agent, has good crack resistance and processing performance, AC, DC. 
 Uses: used in ductile iron, cast iron machining high-strength and non-working side surface welding. 
 Chemical Composition of Deposited Metal /% 
 C ≤ 2.5 S ≤ 3 Mn ≤ 1.8 Ni 45-60 nodulizer amount 

 Z607 cast iron electrode 
 Description: copper welding cast iron core, low hydrogen electrode, good crack resistance, single-fusion welding of cast iron base is good, but uneven hardness of deposited metal, semi-melted zone hardness, cutting certain difficulties. More layer welding bad shape, easy to produce pores, but the price is cheaper than the nickel-based electrodes, AC and DC. 
 Uses: used for general cast iron welding of non-working side. 
 Chemical Composition of Deposited Metal /% 
 Fe ≤ 30 Other: Cu 

 Z612 cast iron electrode 
 Description: copper clad steel core, titanium calcium type iron electrode, AC-DC dual-use, has good crack resistance, cutting performance in general. 
 Uses: gray cast iron used for general non-working side of welding, such as cylinder body welding and so on. 
 Chemical Composition of Deposited Metal /% 
 Fe ≤ 30 Other: Cu