How can I maintain the tungsten electrode to prevent contamination?

Prevent tungsten contamination by cleaning the electrode using a proper grinding tool with guards in place, only wear clean dry gloves and minimize exposure of the tungsten tip. Consult section on Selecting and Preparing Tungsten for DC Or AC welding with Inverter Machines (Section 9). Post-welding, inspect the tungsten and weld sites for any dark discoloration that would indicate contamination, and increase postflow if necessary to help prevent issues.