Why Is the Root Pass Weld Started on Top of a Tack

question 6

Multiple Choice

Why is the root pass weld started on top of a tack weld?

• A) To eliminate the potential lack of fusion
• B) To prevent porosity caused by the lack of shielding gas at the instant the weld starts
• C) So the arc light will show the root opening and make it easier to get aligned with the root opening as the weld moves off of the tack weld
• D) The root pass can be started anywhere it is comfortable for the welder to begin welding.

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