Welding Symbols: How to Understand Them - D&H Secheron
                     
Description
Welding symbols are critical information for welders to do their job perfectly. Welding symbols contain important 
information such as welding positions, welding processes, dimensions, geometry of the weld, groove/fillet details, 
etc. These symbols are presented graphically by the designer for the welders. You can say that it is a universal 
language in welding to maintain uniformity, consistency and accuracy. 
Use of Welding Symbols on Drawings
The welding symbols indicate the welding processes deployed in metal joining operations. They show all 
information necessary to understand the basic shape and locations of welding components.
Welding Symbols with Examples
Five Welding Symbols with Examples
1. Groove-V
A groove weld is used to show parts coming together in the same plane. It is usually performed to make edge-to-
edge joints but they are also sometimes used for corner joints, T joints, and joints between curved & flat pieces.
Groove-V gets its name from the V-shaped angle that it gets after the edges of both workpieces are cut off. There 
can be a single or double Groove-V, that is usually used for thicker materials because it is easy to apply the weld 
and create a stronger weld.
2. Groove-Bevel 
In groove-bevel, the edge of one workpiece is cut-off and the other one is left square. It 
needs less joint preparation as well as less weld metal. It is also used for thicker materials or 
when it is possible to modify one of the connecting components. 
3. Groove-J
When the edge of one of the pieces gets concave treatment while the other one is left 
square, it results in a J-shaped angle known as groove-J. The groove cuts in less material 
which means less weld filler is used. However, groove-J is not as easy or affordable as 
groove-bevel.
4. Fillet
The fillet weld symbol is represented as a right triangle placed on the reference 
line with the perpendicular leg on the left. It is used when the two members of 
the joint come together to form an intersection of 90 degrees. Fillet welds are 
generally used for boiler and pressure vessel manufacturing industries.
5. Back or Backing
A back weld is formed on the back side of the joint once the groove weld is performed. A 
backing weld, on the contrary, is applied to the root of the groove before the groove is 
welded. However, they both use the same symbols. 
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Sécheron Electrodes Pvt. Ltd. made products that is an ISO 9001-2015 certified 
company and a trendsetter in the welding consumables industry since its inception in 
1966.
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