Double Fillet Weld Symbol

Double Fillet Weld Symbol is used for filled weld applications for both side fillet weld. A Double Fillet weld is applied usually to plate welds where access for both side welding is available. In this …

double-fillet-weld-symbol-with-unequal-sizes

Double Fillet Weld Symbol is used for filled weld applications for both side fillet weld. A Double Fillet weld is applied usually to plate welds where access for both side welding is available.

In this blog post, we will delve into the details of this symbol, exploring its meaning, applications, and interpretation.

What is a Double Fillet Weld Symbol?

The Double Fillet Weld Symbol is a graphical representation used to indicate the requirements for a joint consisting of two parallel fillet welds, opposite to each other welded on same joining members. It is typically used in structural steel fabrication and other applications where strength and load-bearing capacity are critical.

Interpreting the Double Fillet Weld Symbol

The Double Fillet Weld Symbol consists of a

  1. reference line,
  2. arrow line
  3. two fillet weld symbols (triangular shape)
  4. Tail.

The fillet weld symbol is placed above the reference line and below the arrow line, referring that the weld is on the arrow side and the other side of the joint as shown in the below figure.

both-sides-Fillet-weld-symbol

Size and Dimensions

The size and dimensions of each fillet weld are represented on the symbol. They are indicated always in left side of the weld symbol (Triangle shape). Weld length if required, is placed on the right side of traingle.

See also  Understanding the Chart of Welding Symbols

The dimensions can be specified using standard measurements such as leg length (z), throat thickness (a), or weld size.

Below is an example of a double fillet welding symbol having different weld sizes. In AWS system, usually Leg length represents the weld size while in ISO, BS, EN and Australian standards, Weld size refers to the Throat size of the fillet.

Joining and Welding Processes

The Double Fillet Weld Symbol can be applied to various welding processes, including shielded metal arc welding (SMAW), gas metal arc welding (GMAW), or flux-cored arc welding (FCAW), among others.

The specific welding process is typically identified by mentioning in the tail of the welding symbol. Either it can be written as a Note of directly specifying the WPS Number or Welding process or any other required information.

Applications and Considerations

Double fillet welds are commonly used in applications where strength, load-bearing capacity, and resistance to fatigue are crucial. They are frequently employed in structural steel connections, such as beam-to-column joints or plate-to-gusset connections.


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Sandeep Kumar is a highly experienced welding professional and author known for his expertise in welding symbols. With certifications including IWE, AWS-CWI, and ASNT NDT Level III.