Buffer Layer
A buffer layer is an intermediate layer of a special filler material that prevents brittle phases or cracks and protects against hardening and cold cracking.
Physical-Chemical Mechanism of Action
The buffer layer forms through diffusion of elements between the weld metal and a special filler material. This prevents brittle phases from forming or cracks from appearing.
Metallurgical Relevance & Welding Risks
Without a buffer layer, hardening and cold cracking can occur, which affects the strength of the weld. A lack of diffusion of elements leads to brittle phases and increases the risk of cracks.
Workshop Practice & Instructions
Use a buffer layer when welding metals that are prone to hardening or cold cracking. Make sure the filler material is selected and applied correctly. The thickness of the buffer layer should be adjusted according to the material and application.