Bead distribution
Bead distribution is the arrangement of weld beads in a multi-pass weld cross-section. It influences the microstructure through controlled thermal cycles and improves mechanical properties.
Physical-Chemical Mechanism of Action
The bead distribution affects the thermal distortion of the metal during the welding process. By strategically arranging the beads, controlled thermal cycles can be achieved, which improves the microstructure and mechanical properties.
Metallurgical Relevance & Risks in Welding
An uneven bead distribution can lead to unequal stresses, which may cause cracks or distortion in the weld pool. An optimal distribution ensures a homogeneous microstructure and increases the toughness and strength of the weld.
Workshop Practice & Action Instructions
To ensure good bead distribution, pay attention to the following points:
• Use uniform spacing between beads (approx. 2 to 3 mm).
• Make sure the beads are aligned parallel to the welding direction.
• Avoid overlaps or gaps between the beads.
• For complex components, a special distribution may be required to minimize stress areas.