Presentation on theme: "Welding Drawings. Designing for welding The primary importance of welding is to unite various pieces of metal so that they will operate as a unit structure."— Presentation transcript:
Designing for welding The primary importance of welding is to unite various pieces of metal so that they will operate as a unit structure to support the loads to be carried Welding processes include arc welding, gas welding, and resistance welding (40 total processes exist)
Gas & Arc Welding Most common form is oxyacetylene welding gets heat from the burning of flammable gases. It is slow compared to other modern welding methods so is used primarily for repair & maintenance Arc welding is the major industrial welding process-heat is generated by an electric arc struck between a welding electrode, or rod, and the workpiece. The arc is hot and melting and solidification of the weld metal occurs rapidly.
Resistance welding Widely used especially for mass production work Heat is created from resistance losses as a high amperage current is sent across a joint between 2 mating surfaces
Plug welding A plug weld refers to joining two pieces by welding through a hole in one of the pieces*
The difference between Weld symbol & Welding symbol…* Weld symbol indicates the type of weld Welding symbol is a method of representing the weld on drawings. It includes supplementary information & consists of the following 8 elements. Reference line Arrow Basic weld symbol Dimension and other data Supplementary symbols Finish symbols Tail Specification, process or other reference
Location significance of Arrow* Arrow side- for fillet, groove, flanged weld symbols the arrow connecting the welding symbol reference line to one side of the joint Other side – the side opposite the arrow side Both sides