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This covers our wages and keeps our resources free to use. Learning and knowing your welding symbols well is equally important as learning to weld properly. Unfoutuanltey, we still have some welding professionals that are not familiar with the welding symbol chart. Some people think that just knowing the welding process is enough. It might be for amateurs, but professional welders have to have exact knowledge about welding symbols.

If your goal is to become a pro one day read bigger salary! We break down all the important pieces about this topic right here. This is a Massive article with well over words, over 50 subheadings, and symbol drawings. Just a small side note. I drew all of the drawings myself in vector-based software.

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Learning all the welding symbols may be hard as there are a lot of them. 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. The most important symbols that you do have to memorize are the fillet weld symbol and the groove weld symbol.

You are more than likely going to come across welds on engineering and fabrication drawings. These are a set of symbols that describe the weld, the weld leg size, as well as giving processing and finishing information.

The joint is the basis for reference for welding symbols. Elementary symbols are usually added to the reference line. Their purpose is to indicate the type of weld. You can usually find them marked at the midpoint. These symbols are combined so as to convey certain configurations. 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.

Symbols for double-sided butt welds are drawn on the opposite side of each other. Complementary symbols exist as additional information. Their purpose is to add info about something like the shape of the basic weld and how it should be made. Weld symbols come with an arrow that points to the direction of the drawing where a weld needs to be made.

The arrow line is connected to a leader line which is intersected with a horizontal reference line. You can also find a tail at the opposite end of the reference line which then branches off in two different directions. The tail is an optional element. The arrow is the main element of weld symbols. The arrow line points towards the place that is supposed to be welded. The stem of the arrow should not be depicted as a horizontal line on the drawing.

Being 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. Reference lines are important welding symbols drawn as a straight line horizontally across the drawing. The reference line arrow also contains additional details about the welding itself. It can contain some valuable information like the joint design, the weld pattern, the weld size, etc.

Both the upper and the lower reference line have the same elements for both sides. The main difference is the info about where one actually needs to weld.

The lower part is a narrow side where the arrow indicates what side to weld based on the provided elements. The elements given on the upper part describe the other side of the joint. This info is very useful when each side comes with different details of the joint. Also, it helps to diminish the usage of too many welding symbols in one joint. The tail is the third weld symbol part. It is drawn at the end of the reference line opposite the arrow.

It usually contains information for which there is no provision elsewhere. The tail can provide info about the welding process, the reference document, and the examination process. If provisional info is not relevant, the tail is omitted. The above image shows how a typical welding symbol may be constructed. This may differ a bit from region to region but this is the way it is done most of the time.

This graph is the most important one to have on you when reading the symbols or to memorize what each of its parts means. In time you will memorize all of it and it will be like second nature to you. Numbers represent a valuable part of weld symbols. They provide ceratin info placed above and below the reference line.

Welds, with the exception of plug and spot welds, come with a length component. It may refer to the length of the entire joint or a certain part of it. But if it refers to the entire length of the joint, then it is not given at all. The weld width can usually be found on the left of the weld symbol, while the length is placed on the right side. As far as groove welds go besides the weld symbol, length, pitch, and size, info about the depth of penetration, groove angle, root opening, and the degree of beveling on the base metal can be added.

When you see that the type of weld is placed below the reference line it means that the weld should be on the same side of the joint as the arrow side. But if it is placed above the line, then it is supposed to go on the opposite side of the joint. However, if the symbol appears both above and below then both sides of the joint need to be welded. A welding position will also come with a basic welding symbol that is usually found at the center of the reference line.

These weld symbols are usually displayed as a cross-section of the weld. The Fillet weld is used to create lap joints, corner, and T joints. This weld has a close to triangular cross-section similar to what its symbol looks like. When making a fillet weld the weld metal gets deposited in the corner that is formed by the two elements to be joined. The weld then penetrates and fuses with the elements to form a solid joint.

Groove is one of the most common welds you will come across in your welding career. It is often used to weld edge-to-edge joints but that is not where its use ends.

This joint configuration can be used with T joints, corner joints, joints binding flat and curved elements, and so on. Knowing how to do this well and how to read its symbols is paramount to being a quality welder. There are a lot of ways to make this weld and they mostly have differences based on geometry and edge preparation.

This weld is made by using a tight fit between the edges of the pieces or by giving them a root opening separating them slightly as instructed on the symbol.

Now the situation gets a bit more complex. The edges of the V groove weld are to be chamfered in order to make a V-shaped opening between the pieces where the weld gets deposited. The symbol can hold multiple variables like the angle between the pieces, root opening, weld penetration and preparation, and of course any additional information in the tail. This weld is made by chamfering one piece while leaving the edge of another squared. If there is no side significance then it is up to the welder to choose the bevel side.

Similar to the V groove the welding symbol can contain information such as the opening angle, depth of penetration , preparation, and root opening. This weld is less common than the two above but you should know how to read its symbol.

The weld symbol can have all of the elements of the V groove symbol. The J groove weld is to the bevel weld what is U groove to the V groove weld. It is very similar to the bevel weld. Only one side is treated while the other side is left square.

Just like with the bevel weld, the perpendicular line gets drawn on the left side and there is a break in the arrow line if there is a need to specify the side to receive the treatment.

The Flare V groove is most often used to join together two curved or rounded pieces of metal. The dimension then depends on their dimensions. However, the actual depth of penetration matters the most here and is given as usual in the parentheses. This weld is most often used when joining a rounded piece to a flat one. Just like the flare V above, the depth of the groove is formed by the two surfaces with the depth of penetration being the most important metric.

Plug and Slot welds are used to join pieces that are overlapping. During the welding process, the holes are filled with the deposited weld metal which penetrates and fuses the two pieces to form a solid joint. The surfacing welds are used when you need to apply welds over the entire surface of a welded piece or a part of it. Commonly used to reinforce a piece or to repair the worn-down elements. It can be made using single or multi-pass welds.



Free download welding symbols drawings. Welding symbols on drawings

This system became widely used throughout the world, mainly because of the oil industry, and today is used by approximately half the world s welding industry. This is a Massive article with well over words, over 50 subheadings, and symbol drawings.


Free download welding symbols drawings. Welding Symbols on Drawings


In these cases, the arrow points at the edge to be prepared. The vertical upright of the symbol is always to the left on the reference line. If no letter is shown on a drawing, then assume the dimension is leg length. In this case the symbol can also be written as l e l, the length being repeated. The length is always given in centimeters.

A staggered fillet welded joint, realized with access from both sides, can be symbolized by placing a ‘Z’ through the reference line Fig. Figure 9: staggered fillet welded joint A symbol as in the next figure on a double fillet means the weld elements are to be staggered on either side of the joint. Butt welded configurations would normally be shown as a convex profile Fig. Fillet weld symbols are always shown as a ‘mitre’ fillet weld a right angled triangle and a convex or concave profile can be superimposed over the original symbol’s mitre shape.

Figure welded configurations profiles The symbols, in particular for arc and gas welding, are often shown as cross sectional representations of either a joint design or a completed weld. Simple, single edge preparations are shown in the next figure. However, there may be necessary to ad other informations. To the basic information symbols supplementary symbols should be added to in order to provide more details, as shown in Figures.

Figure When there are no specific dimensional requirements specified for butt welds on a drawing using weld symbols, it would normally be assumed that the requirement is for a full penetration butt weld Fig. Figure Numbers to the right of a symbol or symbols relate to the longitudinal dimension of welds, e. Figure Welding process type ISO gives each welding processes a specific reference numbers. As shown in Fig. Other processes are given a unique number.

In this example, refers to MAG welding. Figure There are a number of additional symbols given in the Standards eg EN which refer to additional welding or joint requirements. Figure 20 shows the requirement for a sealing run. Horizontal vertical. Horizontal overhead. Vertical up. Vertical down: Figure welding positions Examples of weld symbolizations: The examples below which show the weld required and their symbolization.

Figure Figure Contour welding symbolization Figure Contour weld realized on site Where: c — width of welded joint l — length of welded joint e — distance between welded joints Figure Symbolization of an interrupted resistance spot welding Establishing of the projections followed by the designation of the welds to be realized Upper and lateral view of the final product: Example of full designation of a welded joint: Home work: Please sketch and symbolize, using as referential EN and EN , following welds: 1.

Plates: 2 mm thickness, butt welded, TIG process, welded from one side 2. Plates: 5 mm thickness, butt welded, MAG process, welded from one side 3. Plates: 8 mm thickness, butt welded, E process, welded from one side 4. Plates: 8 mm thickness, fillet welded, E process, welded from one side 5. Plates: 12 mm thickness, fillet welded, E process, welded from both sides 6. Plates: 12 mm thickness, fillet welded, SAW process, welded from both sides 7. Plates: 16 mm thickness, butt welded, E process, welded from one side, K joint 8.

Plates: 16 mm thickness, butt welded, E process, welded from one side, T joint 9. Plates: 20 mm thickness, butt welded, SAW process, welded from one side The comprehensive scope of this book encompasses topics including orthographic, isometric and oblique projections, electric and hydraulic diagrams, welding and adhesive symbols, and guidance on tolerancing. Written by a member of the ISO committee and a former college lecturer, the Manual of Engineering Drawing combines up-to-the-minute technical accuracy with clear, readable explanations and numerous diagrams.

Skip to content. Welding Symbols on Drawings. Author : E. Interpretation of Metal Fab Drawings. Welding Symbols On Drawings. Welding Symbols. Author : Builder’s Book Inc. Blueprint Reading Basics.

Manual of Engineering Drawing. Author : Colin H. Simmons,Dennis E. How to Read Shop Drawings.

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