Number of ionisations per electron per volt during arc ignition by electric breakdown is equal to welding power source cooling less than shielding gas velocity known as avalanche factor equal to number of dissociation events per mole of diatomic gas

Arc discharge is characterised by

The net electric current in arc is electron current - ion current ion current - arc current electron current + ion current only determined by ion current

An arc flash is defined as: Electricity igniting an explosive mixture of material in the air Reflex response to passage of electrical current through the body Procedures to safeguard employees from the unexpected energization or startup of machinery and equipment Sudden release of electrical energy through air when a high-voltage gap exists and there is a breakdown between conductors

A change in the number of sparks given off by the weld as it progresses can be used as an indication of ____.Group of answer choiceschanges in the weld temperaturechanges in the temperature of the atmospherechanges in the torch anglechanges in the flame size

The plasma is obtained by the ionization of a gas by means of an electrical discharge at high frequencies up to _______ 10 MHz 20 MHz 30 MHz None of these