When using AC polarity,           % of the heat is concentrated in the tungsten and            % is concentrated in the work.

The                         allows the operator to control amperage during the welding process.

After repairing or replacing any fittings on a shielding gas hose, always                            . 

Industrial welding power sources that can run continuously have a rated duty cycle of                  . 

Lincoln Electric offers a socket style connection for the one-piece gas-cooled GTAW torch called                         .  

If your power source has a 40% duty cycle, this means that it must be idle and given a chance for internal components to cool for every                            .  

Routine maintenance on the water cooler coolant, components and pump motor bearings should occur               .

The typical shielding gas flow rate for argon should be set at                          for GTAW.

When using water as coolant in the reservoir,                    should be added to prevent algae growth which will clog the pump. 

Directions: Match the part of the groove weld to its name.