Inclusion Segregation Zone
The inclusion segregation zone is a microscopic accumulation of sulfides or oxides along the primary solidification fronts, acting as a cause of undesirable anisotropy. It can lead to damage such as cracks and deformation.
Physicochemical mechanism of action
The inclusion segregation zone forms through the concentration of sulfides or oxides along the solidification fronts during the welding process. These inclusions can harden the metal more in certain spots than others, leading to uneven stress distribution.
Metallurgical relevance & risks during welding
The anisotropy caused by the inclusion segregation zone can lead to local cracks and deformation in the weld. These can occur especially when the metal is under mechanical stress or at high temperatures. The uneven stress distribution can also lead to hot cracking and reduced weld life.
Workshop practice & instructions
To minimize the effects of the inclusion segregation zone, careful weld preparation is important. This includes clean surface treatment and avoiding contaminants like sulfides or oxides. Additionally, welding parameters such as temperature, voltage, and time should be carefully set to ensure uniform solidification. For special metals or critical applications, microscopic examination can help identify inclusions and analyze their effects.