2Designing for weldingThe 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 carriedWelding processes include arc welding, gas welding, and resistance welding (40 total processes exist)
3Gas & Arc WeldingMost 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 & maintenanceArc 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.
4Resistance 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
5Plug weldingA plug weld refers to joining two pieces by welding through a hole in one of the pieces*
11The difference between Weld symbol & Welding symbol…* Weld symbol indicates the type of weldWelding symbol is a method of representing the weld on drawings. It includes supplementary information & consists of the following 8 elements.Reference lineArrowBasic weld symbolDimension and other dataSupplementary symbolsFinish symbolsTailSpecification, process or other reference
13Location significance of Arrow* Arrow side- for fillet, groove, flanged weld symbols the arrow connecting the welding symbol reference line to one side of the jointOther side – the side opposite the arrow sideBoth sides