END ACTIVATING FLUX IN CASE OF STEEL GAS PRESSURE WELDING AND STEEL GAS PRESSURE WELDING METHOD BY USE OF SAID FLUX

摘要

PURPOSE:To obtain an economically excellent welding part, by performing the gas pressure welding after forming a flux film consisting of a mixture of specified resin, organic solvent, carbon black, etc., on the end of steel material to be seamed. CONSTITUTION:A film is formed on the seamed end of steel material by spraying or applying a flux consisting of a mixture of resin (synthetic or natural resin) which mainly consists of carbon, hydrogen and oxygen, an organic solvent, and carbon black or graphite, and after that, gas pressure butt welding is performed. As far as the said resin is concerned, in case of synthetic resin, for instance, acryl resin, alkyd resin or polyvinyl butyral resin is desirable.