Flint ignitor is used to ignite the ''Starting Powder/Material'' to start the exothermic welding process inside the mould. Flint ignitor has to be place a few inches away from the mouth of the mould so that the spark can ignite the ''Starting Powder'' easily.
There comes in small size and handy. The mechanical flint ignitors gives long service cycles. They produce a big sparks for ease of igniting the starting powder.