2 Designing 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)
3 Gas & 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.
4 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
5 Plug weldingA plug weld refers to joining two pieces by welding through a hole in one of the pieces*
11 The 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
13 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 jointOther side – the side opposite the arrow sideBoth sides