Seam weld
A circle crossed by two lines on the reference line: a seam weld, a continuous weld made of overlapping spots.
How to read it
Seam welding is like spot welding except that the spots overlap, making a continuous weld. It welds a lengthwise seam in sheet metal, with abutting or overlapping joints.
Like the spot weld symbol, the resistance seam weld symbol has no arrow side or other side significance in itself and is centered on the reference line.
This explains what a symbol specifies on a drawing. It isn't welding instruction, and a drawing's own notes and the governing code take precedence.
Read next
- Next in Welding symbolsBack or backing weldA filled half circle on the reference line: a back or backing weld, a bead deposited at the back of a single groove weld.
- The same shape in BPMN symbolsSequence flow and message flowThe two arrows of BPMN. A solid arrow with a filled head is a sequence flow, the order of steps within one process; a dashed arrow that starts at a small open circle and ends in an open head is a message flow, a message passing between two participants.
More welding symbols
The same shape elsewhere
Browse symbols drawn with arrows, circles or lines.
Sources
- Steelworker, Volume 1, NAVEDTRA 14250, 1996, Naval Education and Training Professional Development and Technology Center, U.S. Navy (Internet Archive), Chapter 3, Drawings and specifications
- Welding Theory and Application, TM 9-237, 1967, Department of the Army (Internet Archive), Glossary; chapter 11, section II
- Scheme of symbols for welding, IS 813:1986, Bureau of Indian Standards (Internet Archive, Public.Resource.Org), Table 1
Researched, edited and approved by Rory Hansen before publishing. Last reviewed September 25, 2026. How we research
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