near the tuyer allowing the air to fall directly on the stock

on the top of the fire covered with a thin layer of coal

away from the tuyer with a thick layer of coal on the top

below the tuyer with the fire coming from deep inside

1300 degree Celsius

1100 degree Celsius

1600 degree Celsius

720 degree Celsius

Oxidising flame

Carburising flame

Neutral flame

None of the above

AC main supply into a DC welding supply

AC main supply into an AC welding supply

DC main supply into an AC welding supply

DC main supply into DC welding supply

40-60 amps

50-80 amps

90-130 amps

140-170 amps