Where does the root opening appear on a groove weld symbol

Where does the root opening appear on a groove weld symbol? There are several dimensions that may be added to a groove weld if it is needed. This can include a groove angle, root opening, …

where-does-the-root-opening-appear-on-a-groove-weld-symbol

Where does the root opening appear on a groove weld symbol?

There are several dimensions that may be added to a groove weld if it is needed. This can include a groove angle, root opening, a groove radius, depth of the groove preparation, and groove weld size.

If additional dimensions are necessary for a groove weld, they can include a groove angle, root opening, groove radius, depth of the groove preparation, and groove weld size.

“When a root opening is required, the dimension of the root opening for a groove weld will be indicated within the designated area on the weld symbol.”

The standard dimensions for root opening, groove angle, groove radii, and root faces of U and J groove welds are determined by the user unless stated otherwise.

In cases where the user’s standard dimensions are not used, the weld symbols will include specific indications for the root opening or root gap dimension. The root opening dimension will be displayed inside the weld symbol.

  • Root opening or Root Gap is shown inside the weld symbol

In summary, If a root opening is required, the root opening dimension of a groove weld will be shown inside the weld symbol as shown in above examples. 

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Where does the Groove angle of the welds appear on a groove weld symbol?

The groove angle of a weld typically appears as a numerical value above the weld symbol representing the groove weld on a welding symbol.

“It is usually placed above the root gap in the weld symbol and is denoted by the degree symbol “°”.

For example, if the groove angle is 45 degrees, it may be displayed as “45°” outside the groove weld symbol as shown in the below example. The groove angle represents the angle between the two surfaces being joined by the weld.

Remember, that the Groove angle symbol is only applicable for groove weld and not for fillet weld. However, you may notice groove angle symbol in T-joint having bevel weld.


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.