<p>Rotational arc welding machine gives a rotational circular motion to an arc generated from an electrode. The machine supports rotatably an electrode (20) at a predetermined distance (d) from the centre of a disc (25) which makes a rotational circular motion and at the same time supports the electrode at the upper part as the supporting point, causing the arc generated from the electrode to make a rotational circular motion by rotating the disc. The electrode does not rotate so that the electricity is directly supplied to the electrode.</p>
