How to Place Weld Symbols on a Drawing to Streamline Your Fabrication Services
Welding is a fundamental process in the industrial fabrication and construction sectors, amongst many other industries. Properly communicating weld requirements on a drawing is essential to ensure the design integrity of the custom product to be fabricated.
A Brief Overview of Weld Symbols and American Welding Society (AWS) Guidelines
Welding generally joins pieces of material at a joint, and a weld symbol on a drawing provides critical information about the weld such as the design construction and applicable standards. The American Welding Society (AWS) provides guidelines for designing and specifying welds and you can find more information about the training and resource material that they offer here. Minimum information typically required to specify the weld is the following:
Weld Symbol Construction – The overall construction of the weld symbol is important as it communicates the requirements of the weld. The means of construction is standardized and controlled by AWS. An important chart to use for reference on weld symbols and construction can be found here: AWS Weld Chart.
Location – Indicates the specific location of the weld with an arrow. The point of the arrow should touch the location of the weld joint on one of the views in the drawing.
Joint Type – Specifies the joint type such as fillet weld, butt weld (full or partial), edge joint, lap joint, corner joint or tee joint. A good training guide provided by AWS for joint types can be found here: AWS Weld Joint Training Guide.
Weld Process – The weld process defines the method for applying the weld and the four most common types of welding process include MIG, TIG, stick welding, and flux core arc welding. Additionally, there are many other unique welding processes available for specialized materials or other unique requirements.
Weld Specifications – Lastly and probably the most important information required for specifying a weld symbol are the codes and standards of which the welds will comply with. These specifications control critical aspects such as quality, testing, inspection, and material requirements.
Common examples of welding standards are ASME Section IX for pressure vessel construction, AWS D1.1 for civil and structural fabrications and API 6A/17D (American Petroleum Institute) for petroleum drilling, completions, transmission, and storage using pipeline equipment.
A Quick Step-by-Step Guide to Proper Placement of Weld Symbols
So, with all of that in mind, a step-by-step guide to placing weld symbols on a drawing can be summarized with the following thought process:
- Identify the weld location or joint.
- Specify the correct type and size of the weld, e.g. ¼-in, 3/8-in…
- Specify the required welding process and all applicable specifications.
Specify additional features and requirements, e.g. length, pitch, grinding, or smoothness. Good examples of specifying these symbols, including where and how to place them on the drawing can be found on the AWS weld symbol chart here.
Quality American Welding and Fabrication Services Since 1987
Welding is a critical construction process. Alloy Fabrication has been welding critical structures for over 35 years. Expertise in welding is what we provide and do, and we’re here to help. Please contact us with any need for guidance or opportunities to help with your custom fabrication project.