Surfacing weld symbol
Also called Overlay, Cladding, Hardfacing
A surfacing weld builds up weld metal on a surface rather than joining parts: to restore dimensions, add wear resistance or apply a corrosion-resistant overlay.
What the surfacing weld symbol means
A surfacing weld builds up weld metal on a surface rather than joining parts: to restore dimensions, add wear resistance or apply a corrosion-resistant overlay.
AWS A2.4 and ISO symbols
Where you see it
Hardfacing, corrosion-resistant overlays on valves and vessel nozzles, and build-up repairs.
What is written next to it
On the welding symbol, the surfacing weld carries the minimum thickness of the built-up layer, written to the left.
How it is inspected
Inspection of a surfacing weld usually covers thickness checks, PT of the overlay and chemistry checks of corrosion-resistant layers. Each inspection is recorded against the weld, so the joint can be signed off with its evidence. See the ITR guide.
Related symbols
Frequently asked questions
What does the surfacing weld symbol look like?
On AWS A2.4 drawings: Two small arcs side by side, below the reference line. A surfacing weld is always on the arrow side. In ISO 2553: The same two arcs, on the solid line.
Is the surfacing weld symbol the same in ISO and AWS?
No. The same two arcs, on the solid line.
Where is a surfacing weld used?
Hardfacing, corrosion-resistant overlays on valves and vessel nozzles, and build-up repairs.
- In production since 2014
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