LUBRICATING TREATMENT FOR OUTSIDE CIRCUMFERENTIAL SURFACE OF FLUX CORED WIRE

摘要

PURPOSE:To provide good lubricity and rust preventiveness to the outside circumferential surface of a wire without spoiling weldability by coating a liquid lubricating agent on the outside circumferential surface of the wire under specific conditions by utilizing the technique for electrostatic oil coating. CONSTITUTION:Particles of a lubricating liquid having <=100mu grain size is coated at 0.02-0.26g/m<2> on the outside circumferential surface of a flux cored wire by a technique for electrostatic oil coating. The liquid lubricating agent B stored in the bottom of, for example, a device A is sprayed together with air through a filter into the device A from a nozzle 2 and the mist of the liquid lubricating agent is obtd. The mist is passed under the top end of a baffle plate 4 by the air discharged from a blower 3 toward the direction C and is passed through the inside of a duct 5 where the large particle diameter components fall and only the relatively fine mist is discharged. The mist is further turned back by a duct 5a. The mist is electrified negative by an electrode 6 for charging in the duct 5 and forms an electric field between a wire W passing in the direction penetrating the plane of the figure and an electrode 7 for paint deposition in the outlet of the duct 5 by which the negatively electrified mist is deposited uniformly on the surface of the wire W.