SENSE Module #7 GTAW Exam Q & A

SENSE Module #7 GTAW Exam Q & A The chemical symbol for tungsten is______. - W How long should the post purge (shielding gas) be allowed to flow after the welding arc is broken? - Long enough to allow the base metal and the electrode to cool. When using GTAW to weld Aluminum with alternating current (AC), the tip of the tungsten electrode should be________. - rounded at the tip Alternating Current (AC) is used for welding aluminum because_______. - of the cleaning action and the medium penetration of the arc Which of the following methods is used to start the GTAW arc without touching the base metal? - High frequency start. High frequency current is added to alternating current to ________. - maintain the arc When the GTAW power source is set to DCEP _________. - most of the heat is directed toward the electrode As a general rule,the inside diameter of the gas nozzle should be_____. - three times the electrode diameter Pulsed current is useful for welding stainless steel because it ______. - produces less heat input than steady current Pulsed current is useful for welding out of position because ________. - the weld pool is easier to control The shielding gas most commonly used for welding low carbon steel with GTAW is _______. - argon To b