Weld symbols have been used for many years and are a simple way of communicating design office details to a number of different industrial shop floor personnel such as welders, supervisors, and inspectors. Subcontractors are often required to interpret weld symbols on engineering drawings, from perhaps the main contractor or client to determine the type of weld needed. It is essential that everyone should have a full understanding of weld symbol requirements to ensure that the initial design requirement is met. There are a number of standards which relate to weld symbols, including British, European, International and American American Welding Society standards. Most of the details are often similar or, indeed, the same, but it is essential that everyone concerned knows the standard to be used. One of the first requirements therefore is:.
Welding Symbols & Dictionary
Weld Symbols on Drawings
Welding cannot take its proper place as an engineering tool unless means are provided for conveying the information from the designer to the workmen. The reference line of the welding symbol fig. Any welded joint indicated by a symbol will always have an arrow side and an other side. Accordingly, the terms arrow side, other side, and both sides are used herein to locate the weld with respect to the joint. The tail of the welding symbol is used to designate the welding and cutting processes and the welding specifications, procedures, or supplementary information to be used in making the weld. If a welder knows the size and type of weld, he has only part of the information necessary for making the weld. The process, identification of filler metal that is to be used, whether or not peening or root chipping is required, and other pertinent data must be related to the welder.
A review of the application of weld symbols on drawings
Welding symbols, when properly applied to drawings and, as importantly, when correctly interpreted, offer a potentially convenient way of controlling the welding of a particular joint. The need for consistency in both the application of welding symbols to engineering drawings, and the accurate interpretation by personnel directly involved in manufacturing or construction, led to the development of a standard for these activities. Part A of this standard covers welding symbols, Part B deals with brazing symbols, and Part C describes symbols for specifying nondestructive examinations.
A groove weld will be used when to parts come together in the same plane. These welds will be applied in a butt joint and may have a preparation or not before welding. This is the reason there are several types of groove welding symbols. The symbols for these grooves are nearly identical to the symbols that represent them.