Helium has been mixed with ____ to gain the combined benefits of cathode cleaning and deeper penetration, particularly for manual welding.
A) hydrogen
B) argon
C) nitrogen
D) acetylene
Correct Answer:
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Q13: Preflow is the time during which gas
Q14: Nitrogen is used to increase surface tension
Q15: The gas tungsten arc welding (GTAW) process
Q16: The advantages of water-cooled torches make them
Q17: GTA welding is efficient for welding metals
Q19: The time of postflow is determined by
Q20: Pure tungsten has _ heat resistance and
Q21: Four major components make up a GTA
Q22: The term TIG is short for tungsten
Q23: The speed at which current changes back
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