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Hidden messages in welding drawings: How to quickly decipher the secrets of welding symbols?
Welding is an important and indispensable technology in engineering and manufacturing industries. During the welding process, it is crucial to correctly interpret the symbols shown on the welding drawings. Especially for common welding methods such as fillet welding or lap welding, the welding symbols in the welding drawings provide key information to help welders ensure that their work meets the design requirements. This article will delve into the interpretation techniques of welding symbols to help you quickly grasp the hidden messages in welding drawings.
Welding is an important and indispensable technology in engineering and manufacturing industries. During the welding process, it is crucial to correctly interpret the symbols shown on the welding drawings.
Basic concepts of welding
There are many types of welding, the most common of which are fillet welding and lap welding. These welds usually join two metal pieces together in a vertical or angled manner. The weld formed by welding is triangular in shape, and depending on the skill of the welder, the weld surface can be concave, flat or convex. Welders usually use fillet welding when connecting pipes to flanges, welding structural intersections, etc., because bolts may not be strong enough and are prone to wear.
There are many types of welding, the most common of which are fillet welding and lap welding.
Interpretation of welding symbols
Welding symbols allow welders to quickly understand the manufacturer's specific requirements for welding. Generally speaking, the main body of a welding symbol is a symbol shaped like a triangle, which is located above or below a flat line called a "reference line." It is particularly important that the position of the symbol provides an indication of which side the weld should be made.
Welding symbols allow welders to quickly understand the manufacturer's specific requirements for welding.
In welding drawings, the two main symbol standards are the "A-System" (commonly used in Europe) and the "B-System" (mainly used in the United States). For example, in "A-System" there are two parallel lines as reference lines, one solid line and the other dotted line; while in "B-System" there is only one solid line. If the triangle symbol is below the solid line, welding will be done on the side the arrow is pointing to; if it is above the solid line, welding will be done on the other side of the arrow.
Several key parameters of welding
Each weld consists of five main parts: the root, foot, face and throat. The root is the bottom-most, deepest part of the weld; the foot is the edge of the weld; and the face is the outer shape that is visible when viewing the weld. Understanding these parameters will be critical to achieving the proper weld quality.
Also note that the strength of the weld is an important aspect of the design and is usually indicated by a combination of letters and numbers preceding the reference line. For example, "E70" means the electrode has a tensile strength of 70,000 pounds per square inch.
Understanding these parameters will be critical to achieving the proper weld quality.
Marking method for intermittent welding
Intermittent welds are different from continuous welds and are indicated by two numbers to the right of the triangle symbol. The first number indicates the length of the weld, while the second number indicates the pitch, or the distance between intermittent welds. This type of welding is often used when a continuous weld is not required, or to prevent deformation of the joint due to heat effects.
When interpreting welding symbols, if you find that there are several welding symbols and they do not completely overlap, it means that this is a staggered intermittent welding. In welding projects, this technology can effectively improve the stability and life of welding.
In welding projects, this technology can effectively improve the stability and life of welding.
Conclusion
Welding symbols play a vital role in welding technology, helping workers to accurately grasp welding requirements and its technical details. By learning these symbols, we can further improve welding quality and work efficiency. For today’s welders, interpreting these welding drawings is no longer a challenge, but a necessary skill. So, are you also ready to delve into the world of welding symbols and uncover the secrets behind them?
