Weld Notch Deformation
Weld notch peening is a targeted plastic deformation of the transition zone between weld metal and base material by mechanical hammering. It reduces the local notch radius and increases the weld’s service life.
Physical-Chemical Mechanism of Action
The weld notch peening is achieved by mechanically hammering the transition area between the weld metal and the base material. This causes plastic deformation, altering the notch structure.
Metallurgical Relevance & Welding Risks
Reducing the notch radius by peening increases the strength and toughness of the weld. A notch radius that is too large can lead to cracks and deformation, while a radius that is too small can increase hardness and alter the microstructure.
Workshop Practice & Action Instructions
To carry out effective weld notch peening, the notch radius should be reduced to approximately 1 to 2 mm. This is achieved by hammering with a suitable tool, e.g., a peening hammer. The peening should be done in several steps to ensure uniform deformation. During peening, care must be taken to avoid uneven pressure distribution, which could lead to further deformation or cracking.