"Welding is a fabrication or sculptural process that joins materials, usually metals or thermoplastics, by causing coalescence. Use it to indicate welding operations on working drawings. The vector stencils library "Welding" contains 38 welding joint symbols to identify fillets, contours, resistance seams, grooves, surfacing, and backing. The diagram example "Elements location of a welding symbol" is contained in the Mechanical Engineering solution from the Engineering area of ConceptDraw Solution Park. The example chart "Elements of welding symbol" is redesigned using the ConceptDraw PRO diagramming and vector drawing software from the Wikipedia file: Elements of a welding symbol.PNG. In complex applications, such as those involving alloys other than mild steel, more information may be called for than can comfortably be indicated using the symbols alone. The arrow is annotated with letters, numbers and symbols which indicate the exact specification of the weld. In engineering drawings, each weld is conventionally identified by an arrow which points to the joint to be welded. The US standard symbols are outlined by the American National Standards Institute and the American Welding Society and are noted as "ANSI/ AWS". "The symbols and conventions used in welding documentation are specified in national and international standards such as ISO 2553 Welded, brazed and soldered joints - Symbolic representation on drawings and ISO 4063 Welding and allied processes - Nomenclature of processes and reference numbers. The engineering drawing example "Butt weld geometry" is included in the Mechanical Engineering solution from the Engineering area of ConceptDraw Solution Park. This engineering drawing example was redesigned using the ConceptDraw PRO diagramming and vector drawing software from the Wikimedia Commons file: Butt Weld Geometry.GIF. Lap joints are also commonly more than two pieces thick - depending on the process used and the thickness of the material, many pieces can be welded together in a lap joint geometry." Single-U and double-U preparation joints are also fairly common - instead of having straight edges like the single-V and double-V preparation joints, they are curved, forming the shape of a U. Other variations exist as well - for example, double-V preparation joints are characterized by the two pieces of material each tapering to a single center point at one-half their height. The five basic types of weld joints are the butt joint, lap joint, corner joint, edge joint, and T-joint (a variant of this last is the cruciform joint). "Welds can be geometrically prepared in many different ways. This engineering drawing shows different types of geometry of butt welds. The engineering drawing example Welding symbols is included in the Mechanical Engineering solution from Engineering area of ConceptDraw Solution Park. Welders use fillet welds when connecting flanges to pipes, welding cross sections of infrastructure, and when fastening metal by bolts isn't strong enough." The weld is aesthetically triangular in shape and may have a concave, flat or convex surface depending on the welder’s technique. These welds are commonly referred to as Tee joints which are two pieces of metal perpendicular to each other or Lap joints which are two pieces of metal that overlap and are welded at the edges. "Fillet welding refers to the process of joining two pieces of metal together whether they be perpendicular or at an angle. The symbol is interpreted as a simplified cross-section of the weld. The weld type symbol is typically placed above or below the center of the reference line, depending on which side of the joint it's on. This engineering drawing present weld type symbols and fillet weld symbols.
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