Groove Flank Surface Roughness
Edge preparation roughness is the surface condition of the joint faces after mechanical or thermal treatment. It must be smooth and free of contaminants to ensure a clean weld.
Physical-Chemical Action Mechanism
Edge preparation roughness affects the attraction between the joint faces and the weld. Too high roughness can hold oxygen pockets, leading to hardening. Too low roughness can reduce the contact area and hinder weld formation.
Metallurgical Relevance & Welding Risks
High edge preparation roughness can lead to hardening risks, as oxygen pockets get trapped at the surfaces. Too low roughness can slow down weld formation and cause wear. Both factors can lead to failed weld attempts or weak joints.
Workshop Practice & Instructions
The edge preparation roughness should be between 30 and 60 µm. This can be achieved through mechanical methods like grinding, polishing, or chemical processes. Always use clean tools and materials. Check the roughness with a microscope or a roughness tester after machining.