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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)
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.
Resistance weldingWidely used especially for mass production workHeat is created from resistance losses as a high amperage current is sent across a joint between 2 mating surfaces
Plug weldingA plug weld refers to joining two pieces by welding through a hole in one of the pieces*
WELDING DRAWINGS
BASIC WELDING JOINTS
J-GROOVEFLARE BEVEL GROOVESPOTPROJECTIONSEAM
FILLETPLUGSLOTSQUARE GROOVEBEVEL GROOVE
APPLICABLE WELDSTYPE OF JOINT
WELDING DRAWINGS
BASIC WELDING JOINTS
J-GROOVEFLARE V-GROOVEFLARE BEVEL GROOVEEDGE FLANGE
SQUARE GROOVEV-GROOVEBEVEL GROOVEU-GROOVE
APPLICABLE WELDSTYPE OF JOINT
WELDING DRAWINGS
BASIC WELDING JOINTS
FLARE V-GROOVEFLARE BEVEL GROOVEEDGE FLANGECORNER FLANGESPOTPROJECTIONSEAM
FILLETSQUARE GROOVEV-GROOVEBEVEL GROOVEU-GROOVEJ-GROOVE
APPLICABLE WELDSTYPE OF JOINT
WELDING DRAWINGS
BASIC WELDING JOINTS
J-GROOVEFLARE BEVEL GROOVESPOTPROJECTIONSEAM
FILLETPLUGSLOTBEVEL GROOVE
APPLICABLE WELDSTYPE OF JOINT
WELDING DRAWINGS
BASIC WELDING JOINTS
EDGE FLANGECORNER FLANGESPOTPROJECTIONSEAMEDGE
PLUGSLOTSQUARE GROOVEBEVEL GROOVEV-GROOVEU-GROOVEJ-GROOVE
APPLICABLE WELDSTYPE OF JOINT
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 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 jointOther side – the side opposite the arrow sideBoth sides