Root face height

Physical-chemical mechanism of action

The web height affects the cooling rate of the weld. A web height that is too high can lead to slow cooling, which coarsens the structure and reduces the toughness of the steel.

Metallurgical relevance & risks during welding

A web height that is too high increases the likelihood of burn-through and distortion. A web height that is too low can lead to inadequate control of root penetration, which can result in hot cracks and lack of weld volume.

Workshop practice & action instructions

The optimal web height is typically between 1 and 2 mm. For heavy steel grades or under high stress conditions, the web height should be lower to ensure fast and controlled cooling.