Double-Bevel Groove
The K-groove is an asymmetric double-V groove with right-angled edges that minimizes uneven restraint forces and stabilizes the weld.
Physico-Chemical Mechanism of Action
The K-groove features an asymmetric shape with an edge on both sides and a right-angled counter-edge. This shape reduces stresses that occur during welding by distributing uneven restraint forces onto the metal surfaces.
Metallurgical Relevance & Welding Risks
The K-groove minimizes the occurrence of cracks and stress concentrations in the weld because it applies mechanical loads more evenly. However, incorrect machining or inaccurate dimensions can lead to uneven stress distribution, which can again cause cracking.
Workshop Practice & Instructions
To achieve a successful K-groove, the edges must be machined precisely square and symmetrical. The surfaces should be clean and free of contaminants. During welding, it is important to control temperatures and times to ensure even cooling and the correct microstructure.