Yep, Miller and Victor are both THE best IMO. We used mainly 7018 for most low-pressure piping and low-load support work but we also had over 50 (yes, 50) DIFFERENT welding procedures for the various materials in the different nuke plants. Anyone can daub things together, especially with MIG, but a good full-pen weldment with good prep, preheat and PWHT (Post-Weld Heat-Treatment, basically a slow cooldown as RWTF has described) is by far the best.
Most smiths fail in the cleanliness dept, others don't really get enough practice to maintain their skill level properly; welding is like anything else, regular practice makes at least 'better' if not 'perfect'. In general I've found that a GOOD professional welder with good equipment does a better job than most smiths, IF I can get him to understand just exactly what's wanted. The best welders I've seen are folks called 'instrument welders' in power plant parlance, craftsmen accustomed to welding very small parts in tight places to withstand very high pressures and rigorous environments. Good welders like this are rare, if you know one then you need to cherish him or her tenderly 'cause they're worth their weight in gold when needed.
Remember clean, preheat and slow cooldown. Mainly clean, and by the way Bubba that includes removing the flash-coating of copper found on new rods(G)!
Regards, Joe
Last edited by J.D.Steele; 11/01/09 11:08 AM.
