Plug or slot weld symbol
Also called Slot weld, Plug weld
A plug or slot weld fills a round hole (plug) or an elongated slot in one plate to join it to the plate underneath.
What the plug or slot weld symbol means
A plug or slot weld fills a round hole (plug) or an elongated slot in one plate to join it to the plate underneath.
AWS A2.4 and ISO symbols
Plug weld, slot weld. The same rectangle, on the solid line for an arrow side weld.
ISO SVGWhere you see it
Lap joints where edge welding is not enough or not possible, and attaching doubler plates.
What is written next to it
On the welding symbol, the plug or slot weld carries the diameter of a plug or the width of a slot, the depth of filling, and the spacing.
How it is inspected
Inspection of a plug or slot weld usually covers visual inspection of the filling and the fusion at the edges. 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 plug or slot weld symbol look like?
On AWS A2.4 drawings: A rectangle on the reference line, below it for an arrow side weld. The arrow side member is the one with the hole. In ISO 2553: The same rectangle, on the solid line for an arrow side weld.
Is the plug or slot weld symbol the same in ISO and AWS?
No. The same rectangle, on the solid line for an arrow side weld.
Where is a plug or slot weld used?
Lap joints where edge welding is not enough or not possible, and attaching doubler plates.
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