When is it safest to weld on a steamed vessel?

Welding on a steamed vessel is safest when it has cooled down to room temperature. At this temperature, the risks associated with steam pressure are minimized. High temperatures can lead to the potential for dangerous steam buildup and thermal stress, while a completely dry vessel could still contain residual moisture or other hazardous materials if not properly inspected. A vessel filled with water is generally not practical for welding, as it can interfere with the welding process and introduce further safety hazards.

By cooling the vessel down, the internal pressure is significantly reduced, and the risks of steam explosions or burns to the welder are eliminated. This makes the welding environment much safer, allowing for proper inspections and adjustments to be made before commencing the welding work.