|"I WANT TO DO AN EB WELD WITH ZERO SPATTER. IS IT POSSIBLE? HOW CAN YOU MINIMIZE SPATTER? THE MATERIAL IS INCONEL 718."
Absolutely. Electron Beam Welding with zero spatter is entirely possible. Especially with this particular Inconel 718 material, you should be able to develop a weld without having any spatter issues.
Weld spatter is typically caused by cleanliness reasons due to contamination of the part- oils, foreign object debris (FOD) left over from prior machining processes, etc. Outgassing can also occur as a result of impurities in the parent material that are ejected (or sometimes trapped) from the weld joint because they have a different melting temperature than the surrounding base metal you are trying to join.
A secondary cause of this issue could be the welding parameters you are using, but we strongly recommend that you rule out all of the above reasons as a preliminary measure.