Cap pass edge depression
Cap pass edge depression is the process in which metal at the edge of the weld deposit falls away or deforms. This can lead to uneven stresses and cracks.
Physical-Chemical Mechanism
In cover pass edge drop-off, stresses arise when the metal at the edge of the weld metal is not deformed uniformly. This can be caused by uneven deformation or different material properties of the cover layer and the weld metal.
Metallurgical Relevance & Welding Risks
Cover pass edge drop-off leads to uneven stresses that can cause cracks and fractures in the weld metal. This can occur especially under high stress conditions and when stress distribution is not uniform.
Workshop Practice & Action Instructions
To avoid cover pass edge drop-off, the following measures should be taken:
• Use a matching cover layer with the same material properties as the weld metal.
• Ensure that the deformation of the weld metal is uniform.
• Maintain uniform stress distribution in the weld metal under high stress conditions.