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A curve meaning it must reach the back.
Also known as: Full penetration symbol, Root reinforcement symbol
The welding symbol requiring full penetration with visible reinforcement on the far side.
Requires the weld to penetrate fully and show reinforcement on the far side of the joint.
Contexts: Technical drawing
Specifies a result on a face the welder cannot see while working, which is why joints carrying it are usually inspected radiographically rather than visually.
Contexts: Technical drawing
A filled arc drawn on the opposite side of the reference line from the weld symbol, bulging away from it.