Dear all
we have a cover casing of compressor and the material is cast iron.one crack created on the cover and we creat a groove on it and drill both end of crack for repair by welding but when we weld it we observe transvers crack on weld metal , we use all cast iron electrode and filler rod such as E-Ni-CI , E-NiCu-7 , ER-NiCu-7 with preheat and without preheat but in all conditions we can`t weld it. thickness is about 1 Cm.
any body can help me for this problem.
best regards
A.A.Sharif