Steep-flanked single-V butt weld
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 a very narrow groove angle (typically 0-8 degrees), designed specifically for electroslag welding (ESW), electrogas welding (EGW), or narrow-gap welding processes. The steep, narrow groove minimises weld metal volume on very thick sections.
In plain English
A V-prep with the sides almost vertical -- the groove angle is tiny, typically under 8 degrees. Normal arc welding cannot work in such a narrow gap, so this is designed for specialist processes like electroslag or electrogas welding that fill the groove in a single pass (or very few passes) using sliding copper shoes to contain the weld pool. Used on very thick plate -- 50 mm to 300 mm+ -- where a conventional V-prep would require an absurd amount of filler metal.
Symbol position
Narrow V symbol on the reference line, often with process designation in the tail.
Size notation
Groove angle (very narrow), root gap, plate thickness.
Common uses
- Electroslag welding of very thick plate (50-300 mm+)
- Electrogas welding of vertical seams
- Narrow-gap automated welding processes
- Heavy section shipbuilding and pressure vessel fabrication
