Square groove weld symbol
Also called Square butt weld, I butt weld
A square groove weld joins two plates edge to edge with no bevel on either edge. It is used on thin material, where the weld penetrates through without a prepared groove.
What the square groove weld symbol means
A square groove weld joins two plates edge to edge with no bevel on either edge. It is used on thin material, where the weld penetrates through without a prepared groove.
AWS A2.4 and ISO symbols
Square butt weld. The same two parallel lines, on the solid line for an arrow side weld.
ISO SVGWhere you see it
Thin plate and sheet butt joints, often welded from both sides, and joints made with deep-penetration processes.
What is written next to it
On the welding symbol, the square groove weld carries the depth of the weld or its effective throat, and the root opening, the gap between the plates, written inside the symbol.
How it is inspected
Inspection of a square groove weld usually covers visual inspection of the weld profile and, where the joint needs full penetration, radiography or ultrasonic testing. 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 square groove weld symbol look like?
On AWS A2.4 drawings: Two parallel lines across the reference line, below it for an arrow side weld. In ISO 2553: The same two parallel lines, on the solid line for an arrow side weld.
Is the square groove weld symbol the same in ISO and AWS?
No. The same two parallel lines, on the solid line for an arrow side weld.
Where is a square groove weld used?
Thin plate and sheet butt joints, often welded from both sides, and joints made with deep-penetration processes.
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