Overlay (surfacing) weld
Applied to joint
Surface build-up / overlay on base plate
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Description
A weld applied to a surface (not a joint) to build up thickness, restore worn surfaces, or apply a corrosion-resistant or wear-resistant layer. Also called surfacing, hard-facing, or cladding depending on the application.
In plain English
Not a joint weld at all -- you are laying weld metal onto a surface to build it up or coat it. If a shaft is worn, you overlay weld it and machine it back to size. If you need stainless corrosion resistance on a carbon steel pressure vessel, you clad the inside with stainless overlay. If you need wear resistance on a crusher jaw, you hard-face it with a wear-resistant alloy. The symbol is two parallel horizontal lines, showing the layer being deposited on the surface.
Symbol position
Two parallel horizontal lines on the reference line. Arrow points to the surface to receive the overlay.
Size notation
Minimum thickness of the overlay shown to the left. Area or extent shown on the drawing.
Common uses
- Hard-facing of wear parts (bucket teeth, crusher jaws, conveyor screws)
- Corrosion-resistant cladding of pressure vessels
- Build-up of worn shafts, rollers, and journals
- Butter layers for dissimilar metal welding
