분말 용가재판을 사용한 광폭 경화육성을 위한 트윈토치 GMAW 공정개발

Abstract

Generally, wear plate is steel plate having improved surface contact strength and impact strength by surface hardening which is welded using materials with good corrosion resistance, wear resistance and thermal resistance property. It is mainly used for hopper, duct, crusher and etc. in electric power station, cement, paper making and chemical industries where thermal resistance and wear resistance properties are demanded. CFP GMAW(Compound Filler Plate Gas Metal Arc Welding) is the cladding method using GMAW with the CFP(Compound Filler Plate), which is bound with waterglass, on the substrate. It has advantages of reducing compound powder loss, uniform and shallow penetration, and preventing hardness decrease. To develope mass production technique of CFP GMAW process for production of high quality wear plate, the method for controling shallow penetration and increasing productivity is required. In this study, twin torch method applied to CFP GMAW process for increasing productivity. And the method was developed by controling penetration control function, CFP dry time, gas formation flux and water glass concentration. As a result, applying twin torch method to CFP GMAW process was possible and high quality wide bead could be made without overlap joint. And when using penetration control function in KOBELCO inverter 500A welding machine, average penetration depth was increased because of increased arc current at the same welding condition . Penetration depth tended to be deeper as CFP dry time was shorter, and penetration depth was deeper with flux than without flux. Also it is clear that penetration depth tended to be deeper as waterglass concentration was lower, and penetration depth varied with different types of waterglass.