In order for welding to be fully accepted as a tool in engineering, the passing of information from the architect of the design and the end user must be accurate and fully understood. One way of doing this is by using widely accepted welding symbols which enable design drawings to be completed with welding information. The most common method used in the USA is the “third angle” method of projection.

The main reference used for welding symbols is the joint. The joint is used to designate the type of weld to be made, its location, contour, extent, dimensiuons and other additional information. Any joint that is welded is indicated by a symbol and will have an arrow side and an other side.

The tail of the symbol is used for designating the welding and cutting processes as well as the welding specifications, procedures or the supplementary information to be used in making the weld. If a welder knows the size and type of weld, he only has part of the information necessary for making the weld. The process, identification or 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.

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