Welding symbols on drawings

The welding symbol has an arrow, which points to the location on the drawing where a weld is required. The arrow is attached to a leader line that intersects with a horizontal reference line. The symbol is a small drawing that can usually be interpreted as a simplified cross-section of the weld.

The scheme for the symbolic representation of welds on engineering drawings used in this manual is consistent with the “third angle” method of projection. This is the method predominantly used in the United States.

Any symbol that is used to show a joint or weld type feature on the other side of the arrow line is always placed on a dotted line. BS 4and AWS require symbols to be placed above the reference line (which indicate the other side) or below the reference line (indicating the arrow side). The steps below represent a very basic introduction to welding symbols. This is just barely skimming the surface of weld symbols training. If you have a questions please let us know by replying to the post.

Every weld symbol must consist of an arrow and a reference line. Some welding symbols may show a contour finish that details how the fillet weld shape must be finished after welding. The contour may be flat or convex (having a surface that is curved or rounded outward) and the element to describe this is placed above the slope on the fillet weld symbol.

What are the basic welding symbols? What does CJP mean on Weld symbol? What is the symbol for a weld joint? When are gdt symbols used in engineering drawings? The information presented here is just the tip of the iceberg when it comes to AWS welding symbols.

Even for those familiar with welding symbols , it’s a good idea to have a reference chart that contains the symbols and the drawings of what the finished weld will look like. LaRiche introduces welding symbols in about the 10th week of his course. Because welding symbols have an element of interpretation the AWS Standard is very thorough and complete in helping identify the intended weld that the symbols implies. This section is intended to stress the importance of using the AWS standard when using welding symbols.

The assembled “welding symbol” consists of the following eight elements, or any of these elements as necessary: reference line, arrow, basic weld symbols, dimensions and other data, supplementary symbols, finish symbols, tail, and specification, process, or other reference. If you want to read plans or drawings you have to know what the basic welding symbols are. While in the drawing environment the Weld Symbol tool can be found on the Annotation Tab.

The same dialog box as found in the part environment is used to create the symbols. If you create a manual annotation or welding symbol in the drawing, and the model contains a welding symbol or annotation, the drawing welding symbol or annotation is a copy and does not update. The weld symbol is placed by clicking on the desired location of the weld.

To create welding symbols and annotations that update when the model welding symbol and annotations change, right-click a drawing view and click Get Model Annotations, and then select Get Welding Symbols.

These symbols provide the means for placing welding , brazing, and examination information on drawings. F: this is consistent with the weld symbol , butthe view does not show the expected projection of the tube through the flange: also a form unlikely to be use because of clearance problems. G, H: consistent with weld symbol and drawing. To decide between these two, it would be necessary to have details of the flange. Drawings that contain symbols and signs convey information and details about the type and size of weld.

Hence, understanding these symbols and drawings is essential, because incorrect interpretation can lead to incorrect welding , which may affect the end product, and in many cases, ruin the product itself.