TIG plate welding exam Questions And Answers Already Graded A+

Which of the following is true of grinding tungsten electrodes? - ️️If the grinder is used for the metals other than tungsten, particles of these metals may become trapped on the tungsten as it is ground, resulting in contamination when the arc is started. The improved electron emission of the _____ allows it to carry approximately 20% more current than pure tungsten. - ️️Thoriated tungsten The _____ protects the molten weld pool, the filler rod, and the tungsten electrode as they cool to a temperature at which they will not oxidize rapidly. - ️️Postflow period Which of the following is true of erosion of the tungsten electrode? - ️️Slow erosion results in limited tungsten inclusions in the weld. Which of the following is a way to minimize erosion of the tungsten electrode? - ️️Use DCEN current Which of the following is true of DCEN? - ️️With DCEN, a pointed tip concentrates the arc. Which of the following is true of DCEP? - ️️DCEP has the highest heat concentration on the electrode tip. In GTAW, the arc temperature is around _____ Fahrenheit. - ️️11,000 Adding _____ has the same effect on the electrode characteristics as thorium, but it is not radioactive. - ️️Zirconium ______ electrodes have a current-carrying capacity similar to that of pure tungsten, and may be used for both AC and DC welding currents. - ️️Cerium tungsten Which of the following is true of breaking and remelting tungsten? - ️️It should be broken squarely DCEP concentrates _____ of the arc heat on the plate, and _____ of the heat in the electrode. - ️️1/3, 2/3 DCEN concentrates about _____ of its welding heat on the work, and about ____ on the tungsten. - ️️2/3, 1/3_____ results in welds with deep penetration, and a smaller-size tungsten can be used. - ️️DCEN AC concentrates about _____ of its welding heat on the work and _____ on the tungsten. - ️️1/2, 1/2 Which of the following is an inert gas? - ️️Helium