Double-U-Groove Configuration
Double-U groove is a symmetrical U-groove from both sides, used for very thick plates to reduce weld metal volume.
Physical-Chemical Mechanism of Action
The double-U groove reduces the volume to be welded by tapering the plates from both sides simultaneously. This minimizes stress buildup and the risk of cracking.
Metallurgical Relevance & Welding Risks
If executed incorrectly, the double-U groove can lead to uneven deformation, causing stress concentrations and potential cracks in the weld pool. It is important that the U-grooves are symmetrical and uniform.
Workshop Practice & Instructions
For a double-U groove, use a plate cutting process with a precisely set cutting angle and a fixed root gap. The U-grooves should be symmetrical and uniform to ensure even welding. For very thick plates, it is important to divide the weld into multiple passes to minimize the volume per pass.