BRONZE ELECTRODE WITH THICK COATING FOR WELD SURFACING

• Main Authors: NEGRIU RADU MIHAI, VIDA-SIMITI IOAN, GEANT VICTOR, VOICULESCU IONELIA, TEF NOIU RADU, BINCHICIU AURELIA, BINCHICIU HORIA, BINCHICIU EMILIA
• Format: Patent
• Language: English; Romanian
• Published: 30.07.2012
• Subjects: ALLOYS; CHEMISTRY; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; FERROUS OR NON-FERROUS ALLOYS; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; METALLURGY; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; TREATMENT OF ALLOYS OR NON-FERROUS METALS; WELDING; WORKING BY LASER BEAM

The invention relates to electrodes with thick coating, having the ratio between the coated electrode diameter and the uncoated electrode diameter ranging between 1.85...1.95, meant to be used in manual electric welding for reclaiming castings and making wearproof surfaces for protection against sliding and rolling friction strain. According to the invention, the electrodes are made of alloy wire rods of the type 94% Cu and 6% Sn, having a diameter of 5 mm, drawn-out at the desired diameter and cut at lengths of 350 ± 1 mm, which are then coated, by extrusion at working pressures of 2.2...2.5 atm., with composite coatings made of a fluoro-boro-calcic slagging system containing 22 ± 5% fluorite, 3 ± 1% rutile, 11 ± 3% calcinated borax, 9 ± 2% cryolite, 3 ± 1% FeMn 45, 3 ± 1% FeSi 45, 3 ± 1% ferro-boron, 1 ± 0.5% graphite, 1 ± 0.5% carboxymethylcellulose and 28% by mass, at the most, adddition of synthetic powdery precursors of the type 50 ± 10% Cu and 50 ± 10% Sn having a maximal grain size of 0.3 mm, and are intended to welding deposit biphase bronze alloys with 12-14% Sn, having a hardness of at least 80 HB with possibility of growing up to 200 HB after a suitable thermal treatment.