Welding is one of the most commonly used and important processes in modern manufacturing. Its importance is highlighted by the fact that it is used in the production of nearly 90 percent of all manufactured products. Understanding the basics of welding symbols is a key component to mastering the art of welding.
The symbols not only provide the welding process to be used but also provide information on required material properties, joint preparation, and many other welding related factors. This symbol, pictured above, means that a groove weld is to be made using the shielded metal arc welding (SMAW) process.
This symbol is just one of the many symbols that can be found in the welding landscape, each providing specific instructions related to the welding process. In reality, the welding symbol provides a great deal of detail, but it can all be parsed out with just a basic knowledge of the welding symbol and its components.
What is the Meaning of the Welding Symbol Shown?Welding symbols are used to represent information about the welding procedure on a written or drawn welding document. They are typically used to specify parameters such as welding type, welding positions, fill materials and other related information.
Understanding the welding symbols can be critical to ensure the welding job is done correctly and meet any quality requirements.
Types of Welding SymbolsThere are two main types of welding symbols – the linear or block symbols and the arrow symbols.
The arrow symbol is indicated by an arrow that points at the specific point on the drawing that requires welding. The linear or block symbol is a combination of an arrow and a letter that point toward the joint that requires welding.
Components of Welding SymbolsWelding symbols typically consist of five components.
These components are the reference line, arrow, leader line, tail and symbol.
- The reference line is a straight line used to indicate the main axis or orientation of a welded joint.
- The arrow points towards the portions of the part that requires welding.
- The leader line is a curved line connected to the arrow and is used to provide additional information about the weld.
- The tail is the line that connects either the leader line or an arrow to the other welding symbols.
- The symbol is the box used to represent the type of welding to be done (e. g.
arrow for fillet weld, rectangle for bead weld).