Double fillet weld symbol
Also called Fillet weld both sides
A fillet weld on both sides of a T joint. Each side can have its own size, written beside its own triangle.
What the double fillet weld symbol means
A fillet weld on both sides of a T joint. Each side can have its own size, written beside its own triangle.
AWS A2.4 and ISO symbols
Double fillet weld. The same pair of triangles, without the dashed line because the weld is symmetrical.
ISO SVGWhere you see it
T joints on stiffeners, web to flange welds and brackets loaded from both sides.
What is written next to it
On the welding symbol, the double fillet weld carries the size of each fillet beside its triangle, and for intermittent welds whether the two sides are chained or staggered.
How it is inspected
Inspection of a double fillet weld usually covers visual inspection and fillet gauge checks on both sides. 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 double fillet weld symbol look like?
On AWS A2.4 drawings: A triangle above and below the reference line. In ISO 2553: The same pair of triangles, without the dashed line because the weld is symmetrical.
Is the double fillet weld symbol the same in ISO and AWS?
Yes, it is drawn the same way in most legends.
Where is a double fillet weld used?
T joints on stiffeners, web to flange welds and brackets loaded from both sides.
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