Manual Metal Arc M.M.A (Leaving Cert Engineering): Flashcards

Electricity jumps gap creating arc heat to melt and join metals

Over $3000°C$ ($5400°F$)

Most basic and widely used type of electric arc welding

Transformer reduces $240V$ mains to $80-100V$ working voltage

$80-100V$

Metal rod covered with flux coating (chemical powder)

Vaporises to create protective gas shield around weld pool

Air bubbles (porosity) forming inside the weld

Protective coating over weld helping it cool slowly

Chipping hammer

Attaches to workpiece to complete electrical circuit

All components must be connected or no current flows

Welding stations must be kept completely dry

Versatility and portability