Groove face angle
The flank angle is the angle between the prepared edge surface and the sheet surface. It affects the accessibility of the arc for welding.
Physical-Chemical Mechanism of Action
The flank angle determines how well the arc can reach through the edge and heat the metals together. A steep angle (approx. 30°) increases arc accessibility, while a shallower angle (less than 15°) makes welding more difficult.
Metallurgical Relevance & Welding Risks
A too large flank angle can lead to uneven heating and stress buildup, which may result in cracks or hot cracks in the weld metal. Conversely, a too small angle prevents adequate heating and can lead to failed weld attempts.
Workshop Practice & Instructions
For most steel types, the flank angle should be between 15° and 30°. For high-performance laser welding machines, an angle of 20° to 25° may be recommended. Ensure that the edges are cut cleanly and the angle is set accurately to guarantee optimal weld quality.