Single-V butt weld with broad root face
Applied to joint
Butt joint — plates aligned end to end
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Equipment for groove welds
MIG and TIG machines suited for groove weld preparations on plate.
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Description
A single-V preparation with an extended root face (land). The Y-shaped profile provides better fit-up and reduces the risk of burn-through on the root pass compared to a standard V-prep with a thin root face.
In plain English
Same as a single-V but with a thicker flat bit left at the bottom of the groove -- the root face or 'land'. The symbol looks like a Y. That extra metal at the root gives you something to aim at and stops you blowing through on the root run. Useful when you cannot get a backing bar on the back side or when the fit-up is not perfect. The land is typically 3-6 mm depending on plate thickness.
Symbol position
Y symbol on the reference line.
Size notation
Root face dimension shown separately. Groove angle and root opening as per single-V.
Common uses
- Thick plate where burn-through risk is high
- Joints welded from one side without backing
- Pipe welding with open root
- Situations where precise root gap control is difficult
