Seam weld symbol
Also called Resistance seam weld
A seam weld is a continuous weld along overlapping sheets, often a row of overlapping resistance spots made with roller electrodes.
What the seam weld symbol means
A seam weld is a continuous weld along overlapping sheets, often a row of overlapping resistance spots made with roller electrodes.
AWS A2.4 and ISO symbols
Seam weld. The same symbol, centred on the line when the weld has no side.
ISO SVGWhere you see it
Leak-tight sheet metal joints such as tanks, ducts and containers.
What is written next to it
On the welding symbol, the seam weld carries the seam width and length.
How it is inspected
Inspection of a seam weld usually covers visual inspection and leak testing where the seam must be tight. 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 seam weld symbol look like?
On AWS A2.4 drawings: A circle with two parallel lines through it, centred on the reference line. In ISO 2553: The same symbol, centred on the line when the weld has no side.
Is the seam weld symbol the same in ISO and AWS?
Yes, it is drawn the same way in most legends.
Where is a seam weld used?
Leak-tight sheet metal joints such as tanks, ducts and containers.
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