METHOD AND DEVICE FOR AUTOMATICALLY FEEDING FLUX IN NON-CONSUMABLE NOZZLE TYPE ELECTROSLAG WELDING

摘要

PROBLEM TO BE SOLVED: To automatically supply a proper amount of flux by giving a gas-purge inside a flux supply passage by means of carbon dioxide under specific conditions and also attaching a glass fiber tube, whose length reaches near the starting end of welding inside the groove of a material to be welded, to the exhaust port of an automatic flux feeding mechanism. ;SOLUTION: A skin plate 1 and a diaphragm 2 are abutted on each other in T-form, with a steel patch 4 tack-welded, for non-consumable nozzle type electroslag welding. In this case, a gas-purge of carbon dioxide is intermittently applied to the inside of the silicon rubber tube 21 in the flux supply passage, under a delivery pressure of 1-3kgf/cm² by a regulator 24 and a flow rate of 5-15l/min by a flow meter, with a discharging time of 0.5-2 seconds and a stopping time of 1-10 seconds, so that clogging is prevented in the flux supply passage 21 and that a proper amount of flux is automatically supplied to the surface of a molten slag bath. As a result, the flux is efficiently added to the surface of the slag bath without being affected by an ascending current, a generated gas or a material to be welded during the welding.;COPYRIGHT: (C)1998,JPO