This info is very useful when each side comes with different details of the joint. The elements given on the upper part describe the other side of the joint. The lower part is a narrow side where the arrow indicates what side to weld based on the provided elements. The main difference is the info about where one actually needs to weld. It can contain some valuable information like the joint design, the weld pattern, the weld size, etc.īoth the upper and the lower reference line have the same elements for both sides. The reference line arrow also contains additional details about the welding itself. Reference lines are important welding symbols drawn as a straight line horizontally across the drawing. The stem of the arrow should not be depicted as a horizontal line on the drawing.īeing that welding symbols specify the joint that the arrow side is pointing towards as well as a change of direction and a change of geometry of the end of the joint a multiple arrow welding symbol can be added. The arrow line points towards the place that is supposed to be welded. The arrow is the main element of weld symbols. You can also find a tail at the opposite end of the reference line which then branches off in two different directions. The arrow line is connected to a leader line which is intersected with a horizontal reference line. Weld symbols come with an arrow that points to the direction of the drawing where a weld needs to be made. Their purpose is to add info about something like the shape of the basic weld and how it should be made. Complementary SymbolsĬomplementary symbols exist as additional information. Symbols for double-sided butt welds are drawn on the opposite side of each other. If the symbols are not clear enough, meaning that they cannot provide the information needed, there may be a drawing of the cross-section of the weld with its dimensions. These symbols are combined so as to convey certain configurations. You can usually find them marked at the midpoint. Their purpose is to indicate the type of weld. Elementary SymbolsĮlementary symbols are usually added to the reference line. The complete set of welding symbols is published by the American National Standards Institute (ANSI) and the American Welding Society (AWS). The joint is the basis for reference for welding symbols. These are a set of symbols that describe the weld, the weld leg size, as well as giving processing and finishing information. You are more than likely going to come across welds on engineering and fabrication drawings. The most important symbols that you do have to memorize are the fillet weld symbol and the groove weld symbol. However, you should know how to read a welding chart as it is much more important than trying to memorize all of them by heart. Learning all the welding symbols may be hard as there are a lot of them. Contour – These symbols designate the final weld end product contour. Weld all around – It signals that the weld is to be made over the entire circumference.Spacer – This symbol indicates the type and the dimension of the spacer that is inserted between the welded pieces.If it has R in it, it should be removed after welding. Backing bar – Designates the backing bar to be used on the back of the weld.Surfacing – Specifies the welds that are made over the entire surface of the piece.Melt-thru – Indicates that the root of the weld needs to be reinforced.Something like giving the weld a good back. The back weld on another hand goes after the actual weld. The backing weld is deposited before the actual weld in the groove. Back/Backing – They use the same symbol but are different.The article below covers others as well and in more detail. These are some of the supplemental weld symbols. Production of this article took a long time and if you decide to take an image and upload it on your website please add a link back with a source to this original article. I drew all of the drawings myself in vector-based software.
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