Double-V butt joint geometry
Double-V joint geometry: A symmetrical V-shaped weld joint that halves the required cross-section on thick plates and reduces thermal distortion.
Physical-Chemical Mechanism of Action
The double-V joint geometry splits the weld metal cross-section into two equal halves by beveling both sides in a V shape. This leads to a symmetrical layer distribution of the weld materials and reduces thermal distortion during the cooling process.
Metallurgical Relevance & Welding Risks
The symmetrical V-shaped bevel minimizes stress distribution in the weld and prevents asymmetric grain structure. This reduces the risk of hot cracking and increases weld toughness. However, uneven cooling can lead to stresses that may cause cracking or deformation.
Workshop Practice & Instructions
For thick plates, use a double-V joint geometry with a symmetrical V-shaped bevel. Make sure the weld materials are evenly distributed and thermal distortion is minimized. Accurate control of cooling times is crucial to avoid asymmetric grain structure.