Describe how the velocity of the shielding gas and the torch angle affects the protective zone.
What will be an ideal response?
The velocity of the shielding gas affects the protective zone as the torch angle changes. As the velocity increases, a low-pressure area develops behind the cup. When the low pressure area becomes strong enough, air is pulled into the shielding gas. The sharper the angle and the higher the flow rate, the possibility of contamination is increased by the onset of turbulence in the gas stream. This causes air to become mixed with the shielding gas. Turbulence caused by the shielding gas striking the work will also cause air to mix with the shielding gas at high velocities.
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