Electrode holder is connected to negative and work to the positive

Holder connected to positive and work to negative

Holder is positive and work is earthed

Work is positive and holder is earthed

Oxidising flame

Carburising flame

Neutral flame

Cannot be welded by gas welding process

40 to 100 degree celsius

180 to 250 degree celsius

300 to 500 degree celsius

600 to 900 degree celsius

Tinning of two surfaces to be joined, applying flux and heating.

Heating of two surfaces to be joined, to high temperature in presence of flu x.

Heating of two su rfaces at low temperatures.

Joining of two surfaces without the use of flux.

DC-Electrode Positive

DC-Electrode Negative

AC

none of the above