Beading the tube ends in a firetube boiler helps to:

Beading the tube ends in a firetube boiler serves several important functions, particularly in preventing overheating of the tube ends. When the ends of the tubes are beaded, it creates a mechanical stop that keeps the tube in place and provides additional strength. This process also helps in distributing the heat more evenly along the length of the tube, which can reduce the risk of localized overheating.

By creating a rounded bead, the heat transfer characteristics can be improved, allowing for better thermal performance. This is crucial in maintaining the structural integrity of the tubes during operation, as overheating can lead to weaknesses or failures in the material. While beading can also have implications for sealing and structural support, its primary role in this context is centered around managing heat and preventing potential damage due to overheating.