Single-bevel butt weld
Applied to joint
Butt joint — plates aligned end to end
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Description
A butt weld where only one member is bevelled, forming a groove between the bevelled face and the square face of the other member. The arrow of the welding symbol points to the member that is to be prepared.
In plain English
Only one plate gets the bevel -- the other stays square. Think of it as half a V-prep. The arrow on the drawing points to the plate that needs bevelling, which matters when one member is harder to prep (e.g., it is already in position or it is a thicker section). Uses less filler than a full V and is quicker to prepare, but access to the root can be trickier. Common on T-joints where you need full pen.
Symbol position
Half-V (right angle + angled line) on the reference line. Arrow points to the bevelled member.
Size notation
Groove angle, root opening, and root face as per single-V but on one side only.
Notation examples
Both standards use the arrow to indicate which member is bevelled. ISO traditionally uses a broken (kinked) arrow to point to the prepared member, while AWS uses a broken arrow only when it is necessary to distinguish. In practice, both approaches achieve the same result.
Arrow points to the member with the bevel. If the arrow needs to point to a specific member, a broken arrow may be used.
Arrow points to bevelled member. ISO System A uses the broken arrow convention to indicate which member is prepared.
Common uses
- T-joints requiring full penetration
- Corner joints
- Joints where one member cannot be easily prepared
- Repair welds where only one face is accessible
