Question

please choose one option to complete this activity. text answer or audio answer text answer question 9 describe the role of shielding gas in gtaw and explain what may happen if shielding is inadequate. think about how shielding gas protects the weld and what defects occur if this protection fails. you can start your response with: shielding gas is important in gtaw because..

Explanation:

Shielding gas in GTAW (Gas Tungsten Arc Welding) protects the molten weld pool, tungsten electrode, and hot weld metal from atmospheric contamination (oxygen, nitrogen, hydrogen). Inadequate shielding allows these gases to react with the weld: oxygen/nitrogen cause brittleness, porosity, or cracking; hydrogen leads to hydrogen-induced cracking. It also stabilizes the arc for consistent welding.

Answer:

Shielding gas is important in GTAW because it protects the molten weld pool, tungsten electrode, and hot weld metal from reacting with oxygen, nitrogen, and hydrogen in the air. This prevents defects like porosity, brittleness, and cracking. If shielding is inadequate, atmospheric gases contaminate the weld, leading to porous, weak, or cracked welds that fail to meet structural requirements.