Welding Level 3 GTAW Line F questions with 100% correct answers

WHICH HARMFUL GAS WILL BE PRODUCED FROM THE INTENSE UV RADIATION ON THE SURROUNDING AIR? Ozone ONE OF THE PRIMARY BENEFITS OF GTAW IS THE FACT THAT VENTILATION IS UNECESSARY TRUE OR FALSE False True or False GTAW PRODUCES MORE VISIBLE LIGHT RAYS THAN FCAW WELDING? True GTAW USES A CONSUMABLE ELECTRODE TRUE OR FALSE FALSE WHAT DOES THE TERM " AUTOGENOUS " MEAN IN RESPECT TO GTAW WELDING ? A WELD PRODUCED WITHOUT THE USE OF A FILLER ROD . WHAT METALS CAN BE WELDED USING THE GTAW PROCESS ? ALL WELDABLE METALS . ADVANTAGE OR DISADVANTAGE ? GTAW PRODUCES VERY MINIMAL SMOKE , SPATTER , SLAG . ADVANTAGE ADVANTAGE OR DISADVANTAGE? GTAW PRODUCES HIGH QUALITY WELDS ADVANTAGE ADVANTAGE OR DISADVANTAGE? GTAW IS A LOW HYDROGEN WELDING PROCESS. ADVANTAGE ADVANTAGE OR DISADVANTAGE? THERE IS LESS POST -WELD CLEANING . Advantage ADVANTAGE OR DISADVANTGE? GTAW DEMANDS TIGHTER FIT - UP TOLERANCES . DISADVANTAGE WHICH TYPE OF POWER SOURCE IS TYPICALLY USED FOR GTAW ? A CONSTANT CURRENT ( CC ) MACHINE . ADVANTAGE OR DISADVANTAGE? HIGHER ATTENTION TO PRE - WELD CLEANING IS REQUIRED . DISADVANTAGE ADVANTAGE OR DISADVANTAG ? SPECIAL EQUIPMENT MAY BE NEEDED FOR ARC IGNITION DISADVANTAGE ADVANTAGE OR DISADVANTAGE? GTAW REQUIRES INERT SHIELDING GASES DISADVANTAGE ADVANTAGE OR DISADVANTAGE? THE INITIAL COST OF GTAW EQUIPMENT IS HIGHER COMPARED TO OTHER WELDING PROCESSES DISADVANTAGE DCEP OR DCEN OR AC ? ALSO KNOWN AS REVERSE POLARITY IS SELDOM USED FOR GTAW DCEP DCEP OR DCEN OR AC? IS WHEN THE TUNGSTEN ELECTRODE IS CONNECTED TO THE POSITIVE POLE DCEP DCEP OR DCEN OR AC ? REQUIRES THE TUNGSTEN ELECTRODE TO BE CONNECTED TO THE NEGATIVE POLE OF POWER . DCEN DCEP OR DCEN OR AC ? IS THE MOST COMMON CURRENT TYPE AND POLARITY USED FOR GTAW . DCEN DCEP OR DCEN OR AC? USED FOR WELDING METALS SUCH AS ALUMINUM AND MAGNESIUM AC DCEP OR DCEN OR AC? USED WHEN THE ADVANTAGES OF THE CLEANING ACTION OF DCEP POLARITY IS NEEDED . AC WHEN SETTING THE AC BALANCE TO PERFORM CATHODIC GLEANING , WHAT MUST BE INCREASED ? TIME IN THE ELECTRODE POSITIVE SIDE OF THE AC SINE WHAT IS THE RESULT OF USING PULSED GTAW ? DECREASED HEAT INPUT , RESULTING IN LESS DISTORTION . WHAT FEATURE OF PULSED CURRENT MAINTAINS A CONSTANT ARC THROUGHOUT THE PROCESS ? BACKGROUND CURRENT HOSES FOR GTAW SHIELDING GASES ARE TYPICALLY MADE FROM WHAT MATERIAL ? PLASTIC WHICH TYPE OF TUNGSTEN PRODUCES RADIOACTIVE DUST WHEN GROUND ? THORIATED TUNGSTEN WHAT IS THE RESULT OF USING EXCESSIVE CURRENT WHEN WELDING WITH GTAW ? ELECTRODE EROSION , RESULTING IN WELD METAL CONTAMINATION . WHAT DOES A BLUE - TO - PURPLE , OR BLACKENED END OF A TUNGSTEN ELECTRODE INDICATE ? INSUFFICIENT FLOW OF SHIELDING GAS , RESULTING IN OXIDATION OF THE TUNGSTEN . WHEN USING A BALLED OR ROUNDED END FOR AN ALLOYED TUNGSTEN ELECTRODE PROFILE WHAT IS THE IDEAL SIZE OF BALL ? EQUAL TO THE DIAMETER OF THE ELECTRODE . FOR A SHARPENED TUNGSTEN , WHAT IS THE GENERAL TAPER BACK FROM THE END ? 2 TO 2.5 TIMES THE DIAMETER . WHAT HAPPENS WHEN A GAS BECOMES IONIZED ? THEY BECOME CONDUCTIVE WHICH GTAW SHIELDING GAS IS PREFERRED FOR OVERHEAD WELDING ? HELIUM WHICH GTAW SHIELDING GAS IS PREFERRED FOR FLAT POSITION WELDING ? ARGON WHAT METALS ARE ARGON-HYDROGEN MIXTURES USED FOR WITH GTAW ? STAINLESS STEELS WHICH STEELS OFTEN REQUIRE LEADING AND TAILING SHIELDING GASES ? TITANIUM ALLOYS WHICH SHIELDING GAS IS THE MOST COMMON BACK-PURGING GAS ? ARGON HOW IS THE POST FLOW OF SHIELDING GAS TYPICALLY SET ? 1 SECOND FOR EVERY 10 AMPS OF WELDING CURRENT WHY ARE BACKING BARS OR PLATES USUALLY MADE OF COPPER ? BECAUSE OF ITS HIGH THERMAL CONDUCTIVITY AND REDUCED CONTAMINATION OF THE BASE METAL . WHAT TYPE OF METAL TYPICALLY REQUIRES FULL JOINT SHIELDING GAS PROTECTION WHEN GTAW WELDING CHROMIUM TO PREVENT THE FORMATION OF OXIDES ? STAINLESS STEEL WHEN GAS PURGING IS REQUIRED , AT WHAT POINT OF THE WELDING PROCESS SHOULD IT BE UTILIZED ? WHEN TACKING , AND THROUGHOUT THE WELDING OF THE JOINT . TRUE OR FALSE. SOLAR FLUX IS PREFERRED FOR MULTI - PASS WELDS , BECAUSE THE FLUX ONLY NEEDS TO BE APPLIED ONE TIME . FALSE TRUE OR FALSE THE SIZE OF THE FILLER ROD USED WITH GTAW IS TYPICALLY DEPENDENT UPON THE TYPE AND THICKNESS OF THE BASEMETAL ALONG WITH JOINT PREPARATION . TRUE ERTOS - 2 IS CONSIDERED A TRIPLE -DEOXIDIZED FILLER METAL . WHAT DEOXIDIZING ELEMENTS DOES IT CONTAIN IN ADDITION TO SILICON AND MANGANESE ? ZIRCONIUM , TITANIUM , AND ALUMINUM . TRUE OR FALSE WHEN STANLESS STEEL WELDING THE CORRECT FILLER ROD WILL HAVE A COMPOSITION SIMILAIR TO THAT OF THE BASE MATERIAL, ONLY SLIGHTLY RICHER IN NICKEL AND CHROMIUM. TRUE WHICH ARE THE MOST COMMONLY USED ALUMINUM FILLER METALS ? 4043 AND 5056 TRUE OR FALSE CONSUMABLE INSERTS ARE INTENTIONALLY CHOSEN TO ADD ALLOYING ELEMENTS TO THE WELD THAT WOULD NOT HAVE BEEN PRESENT WITHOUT THE INSERT . FALSE ER 70/49 S-X What does the 70 stand for? Indicates the minimum tensile strength in ksi ER 70/49 S-X what dies the 49 stand for? Indicates the minimum tensile strength in MPa/10 ER 70/49 S-X what does the s stand for? Indicates the filler metal is solid ER 70/49 S-X what does the x stand for? Indicates the chemical compositic of a solid electrode TRUE OR FALSE WITH GTAW A LONGER ARC LENGTH WILL CONCENTRATE THE HEAT OF THE ARC , RESULTING IN DEEPER PENETRATION. FALSE WHERE SHOULD THE FILLER METAL BE ADDED WHEN MANUALLY WELDING WITH GTAW ? AT THE LEADING EDGE OF THE WELD POOL . WHAT DOES 6G REPRESENT IN RESPECT TO WELDING POSITION ? A PIPE WELDED WHILE FIXED AT A 45 DEGREES . WHEN WOULD PULSED GTAW BE BENEFICIAL ? WHEN WELDING THIN SHEET METAL OUT OF POSITION . TRUE OR FALSE FOR STAINLESS STEEL WELDING WITH GTAW DIRECT CURRENT ELECTRODE POSITIVE ( DCEP ) IS PREFERRED . FALSE THE THERMAL CONDUCTIVITY OF STAINLESS STEEL IS ABOUT ___________THAN THAT OF CARBON STEEL 50 % LESS WHICH CUTTING PROCESS CANNOT BE USED WITH STAINLESS STEEL ? OXY - ACETYLENE CUTTING . WHAT CAN BE DONE TO REDUCE THE CHANCES OF LOSING CORROSION RESISTANCE WHEN WELDING STAINLESS STEEL? MAINTAIN LOW HEAT INPUT AND INTERPASS TEMPERATURES . WHAT DANGEROUS FUMES/GASES CAN GTAW PRODUCE ? -OZONE -THORIUM DUST -PHOSGENE GAS Ozone is particularly a concern when welding what types of metal? When welding aluminum and stainless-steel due to the highly reflective surfaces What are the most commonly used powers sources for GTAW? -transformers -transformer / rectifiers -generators inverters OZONE IS PARTICULARLY A CONCERN WHEN WELDING WHAT TYPES OF METALS ? WHEN WELDING ALUMINUM AND STAINLESS STEEL DUE TO THE HIGHLY REFLECTIVE SURFACES .