Bevel Angle
The bevel angle of the weld joint is the angle of the machined part edge relative to the perpendicular. It affects the accessibility of the joint faces for the filler metal and can improve weld quality.
Physical-chemical mechanism of action
The bevel angle determines how well the filler metal can reach the joint faces. Too large or too small an angle can create obstacles and hinder the filler metal.
Metallurgical relevance & risks during welding
Too large a bevel angle (e.g., > 60°) can lead to poor filling of the joint, resulting in porosity and low weld strength. Too small an angle (e.g., < 30°) can prevent the filler metal from reaching the faces, leading to incomplete filling and cracks.
Workshop practice & instructions
The optimal bevel angle is usually between 30° and 60°. For stiff steels or high stress levels, a smaller angle (e.g., 45°) should be chosen to improve filling. For soft steels or low stress, a larger angle (e.g., 50°) can be used to increase accessibility of the faces.