MAGNETICALLY CONTROLLED WELDING METHOD FOR NARROW BEVEL AND DEVICE THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a method and a device for magnetically controlled welding for a narrow bevel which can attain proper welding execution and high efficiency welding without generating welding defect such as undercut and overlap even at narrow bevel welding when manufacturing steel shapes structure. SOLUTION: A wire 6 or an electrode 5 is arranged by inserting it in the narrow grove 29 and welding is executed by a welding power source 18 and at that time current 25 is made to flow between a filler wire 7 and a welding electrode 7 in a direction crossing inside of a molten pool 3. Otherwise in the molten pool 3 formed at a post stream side of arc, perpendicular magnetic field 23 is applied to an iron core and further a magnetic field leakage preventing coil 10 is surrounded around an outer periphery of the iron core except a top end thereof. Consequently magnetic lines of force are made to enter the narrow bevel 29 by the iron core 5 and further the magnetic lines of force are made to act only on the molten pool 3 by surrounding the magnetic field leakage preventing coil 10 around the entered iron core 5.