TIG Welding Flux for Super Duplex Stainless Steel

Abstract

A tungsten inert gas (TIG) welding flux for super duplex stainless steel (SDSS) is used to solve the problems of low weld depth/width ratio, low corrosion resistance, and arc blow existing in the conventional TIG welding flux for duplex stainless steel. TheTIG welding flux for SDSS includes 20-30 wt % of silicon dioxide (SiO2), 20-25 wt % of titanium dioxide (TiO2), 15-20 wt % of vanadium dioxide (VO2), 10-15 wt % of molybdenum trioxide (MoO3), 10-15 wt % of zirconium diboride (ZrBr2), 5-10 wt % of aluminum nitride (AlN), 5-10 wt % of manganese carbonate (MnCO3) and 5-10 wt % of nickel carbonate (NiCO3).

What is claimed is: 
     
         1 . A tungsten inert gas (TIG) welding flux for super duplex stainless steel (SDSS), comprising: 20-30 wt % of silicon dioxide (SiO 2 ), 20-25 wt % of titanium dioxide (TiO 2 ), 15-20 wt % of vanadium dioxide (VO 2 ), 10-15 wt % of molybdenum trioxide (MoO 3 ), 10-15 wt % of zirconium diboride (ZrBr 2 ), 5-10 wt % of aluminum nitride (AlN), 5-10 wt % of manganese carbonate (MnCO 3 ) and 5-10 wt % of nickel carbonate (NiCO 3 ). 
     
     
         2 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 5-9 wt % of AlN, 5-7 wt % of MnCO 3  and 5-7 wt % of NiCO 3 . 
     
     
         3 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 9 wt % of AlN, 5 wt % of MnCO 3  and 5 wt % of NiCO 3 . 
     
     
         4 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 5 wt % of AlN, 6 wt % of MnCO 3  and 5 wt % of NiCO 3 . 
     
     
         5 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 5 wt % of AlN, 5 wt % of MnCO 3  and 5 wt % of NiCO 3 . 
     
     
         6 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 9 wt % of AlN, 5 wt % of MnCO 3  and 6 wt % of NiCO 3 . 
     
     
         7 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS comprises 6 wt % of AlN, 6 wt % of MnCO 3  and 5 wt % of NiCO 3 . 
     
     
         8 . The TIG welding flux for SDSS as claimed in  claim 1 , further comprising a volatile solvent. 
     
     
         9 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the volatile solvent comprises methanol, acetone or isopropanol. 
     
     
         10 . The TIG welding flux for SDSS as claimed in  claim 1 , wherein the TIG welding flux for SDSS has a plurality of powdered particles each having a diameter of 50-90 μm.