Gta Study guides, Study notes & Summaries

In gas tungsten arc welding with _____, approximately 70% of the heat is generated at the electrode and 30% on the workpiece. correct answers DCEN True or False? DCEN requires a larger electrode diameter than DCEP for the same current. correct answers False True or False? DCEP cleans surface oxides off aluminum or magnesium. correct answers True What diameter electrode, in inches, should be used to gas tungsten arc weld a lap joint in 1/8" carbon steel. correct answers 3/32" The in...

What does TIG stand for? correct answers Tungsten Inert Gas Define inert. correct answers Doesn't react with metals or other gases. Which gases are used for TIG? correct answers Argon, Helium, argon-helium, and argon-hydrogen What are the principal advantages of TIG? correct answers Heat and the addition of filler metal are independently controlled, and high-quality welds can be made, great for welding materials that oxidize quickly. What are the principal disadvantages of TIG? corr...

Touch start Pilot arc High-frequency start Pulse start correct answers What are the four arc initiation methods? Sugaring correct answers What is the gray/flaked appearance on stainless steel welds known as? Nitrogen dioxide correct answers Which toxic gas only occurs within 6 inches of the welding arc? 15-35 CFH correct answers What is the suggested flow rate for argon according to the book? Hydrogen correct answers Aluminum is very susceptible to porosity caused by the prese...

Advantage or Limitation: GTAW has a low deposition rate. correct answers Limitation Advantage or Limitation: The ability to weld a variety of a(n)_________ of the tig welding process. correct answers Advantage Advantage or Limitation: GTAW has a higher learning time. correct answers limitation Advantage or Limitation: GTAW is a clean process correct answers Advantage Advantage or Limitation: GTAW has a concentrated arc. correct answers Advantage True or False: The torch for GTAW c...

BIOCHEMISTRY C785 OA EXAM QUESTIONS AND ANSWERS LATEST 2024 (GRADED) Choose the correct coding strand (non-template) from this template (non-coding) DNA: 5' ACG GTA 3' (1/1 Points) 5' UAC CGU 3' 3' UAC CGU 5' 3' TAC CGT 5' 5' TAC CGT 3' Correct! First, note that we are asked for a template/non-coding strand of DNA. DNA uses the base T where RNA uses the base U. Therefore, we can eliminate the two answers containing U because they must be RNA and we want DNA. Then, recall that ...

2 % tungsten is what color? correct answers red inert gases are gases that do not react with ? correct answers other gases in the vicinity of the weld, stainless steal and nickle alloys using ____ as shielding gas for the AC GTAW operation one must contend with the less arc stability and less cleaning action? correct answers helium when the current is reduced or there is no current flowing during half of the AC cycle, the arc is said to be partially or completely? correct answers rectif...

Air-cooled torches use _____ to cool the electrode and the internal components of the torch. correct answers Shielding gas The _____ is designed for welding on light-gauge metals at less than 200A. correct answers Air-cooled torch The _____ is adjusted a necessary for different joints. correct answers Stickout The _____ is designed for welding at current levels above 200A. correct answers Water-cooled torch T/F: Post flow is the flow of shielding gas after the arc is extinguished. co...

True or False? Arc welding machines used for GTAW can be either AC and/or DC, but must supply a constant current. correct answers true In GTAW, a high frequency voltage is superimposed on the DC circuit for the purpose of ____ the arc. correct answers starting In a constant current volt-ampere curve, a large percentage change made in the voltage results in _____ percentage change in the current. correct answers a small High frequency is fed into the AC circuit during GTAW to stabilize t...

GTAW FINAL EXAM!!

The symbol for tungsten is what? - W Tungsten is also called what? - Wolfram How long should the post purge (shielding gas) be allowed to flow after the welding arc is broken? a. 1 Second for every 50 Amps b. Post flow is a waste of gas and shouldn't be used c. Long enough to allow the base metal and electrode to cool. - c. Long enough to allow the base metal and electrode to cool. When using GTAW to weld aluminum with alternating current (AC) the tip of the tungsten electrode should be...