Is it not necessary to have welding machine frames securely grounded before underwater welding operations?

Welding machine frames should always be securely grounded before underwater welding operations. This practice is essential to ensure safety by preventing electric shock to the welder and anyone in proximity. Grounding the welding machine minimizes the risk of stray electrical currents, which can be particularly dangerous in wet environments where water serves as a conductor. Proper grounding directs any fault current safely into the earth, reducing the possibility of electrical hazards that can lead to severe injuries or fatalities.

The grounding requirement is universal and is not contingent on the type of power source or specific worksite conditions. Therefore, the assertion that it is unnecessary to ground welding machines before underwater operations is incorrect. Ensuring proper grounding is a fundamental safety measure in electrical welding, particularly in an underwater setting where conditions can amplify risks.