PURPOSE: To prevent the defect in a corner part and to form a bead having high quality with a simple method by coating preliminarily a coating material which does not melt in the stage of welding to a part of a welding rod so that the uneven thickness in the corner bead part is prevented by the coating material.
CONSTITUTION: A welding rod 3 is laid in the contact peripheral part X of plural materials to be joined in the state of pressing said materials to each other and a welding rod 3 is disposed in such a way that a coating material 6 coated on said rod is positioned in the corner part R of the materials to be joined. The rod 3 is successively melted from the straight part S toward an arrow direction to weld the materials to be joined. The bead part is going to be discharged toward the outside in the corner part R of the contact peripheral part X by the outward deflection of the arc generated in the stage of melting the rod 3 but material 6 which is not melted by the heat of the arc remains and therefore the outflow of the bead part to the outside is effectively prevented. The defect in the bead part is thus eliminated in the corner part R and the bead having high quality is formed.
CHIBA SHIGERU
SHIMAMURA KAZUO
ENOMOTO KUNIHIRO
Next Patent: WELDING METHOD BY SQUARE BOXING OF FIRE CRACKER WELDING ROD