1. MANUFACTURERS OF A DIVERSE RANGE OF ADVANCED WELDING CONSUMABLES SECTION 9 NS-ECo-12 COBALT BASED ALLOY FOR SURFACING CARBON, LOW ALLOY STEELS, STAINLESS STEELS AND NICKEL BASED ALLOYS DATA SHEET NO. 135 SPECIFICATION AWS A5.13 JIS Z 3251 CLASSIFICATION ECoCr-B DCoCrC-500BR PRODUCT DESCRIPTION A metallurgically balanced rutile basic flux with controlled additions of high purity amphoteric and acid minerals to adjust molten slag to that compatible of cobalt based alloys. The flux in concentrically extruded onto a fully alloyed core wire using a blend of silicates that ensures both coating strength and resistance to moisture absorption. WELDING FEATURES OF THE ELECTRODE The electrode is used to best advantage on DC+ but is also very stable on AC. Slag detachability is good even when using high preheat. Weld beads are bright and smooth - slightly convex in shape. This convex shape combined with preheat of 100 ° - 300 ° provides maximum resistance to solidification cracking on multi-pass welds and when restraint is high. APPLICATIONS AND MATERIALS TO BE WELDED The alloys ability to withstand thermal shock combined with good resistance to abrasion, erosion, corrosion, oxidation and compressional stresses between 20 ° and 1000 ° C have led to its extensive usage in the following industries: Steel, cement, marine, petrochemical and power generating. Applications include valves, valve seats, hot shear, blades, punches, dies, hot steel, handling components, catalystic crackers, cutting knives. WELD METAL ANALYSIS COMPOSITION % BY Wt. C Mn Si S P Cr Ni Mo W Fe Co MIN 1.0 - - - - 25 - - 7.0 - MAX 1.7 2.0 2.0 - - 32 3.0 1.0 9.5 5.0 TYPICAL 1.4 0.2 1.0 0.01 0.01 29 1.0 0.1 9.0 1.0 Bal. WELD METAL HARDNESS (ALL WELD METAL) TEMP. (°C) HRC HV 20 51 546 400 42 420 600 39 380 800 37 365 900 - 190 Slightly better resistance to abrasion that NS ECo-6 and accepts impact loading slightty better than NS ECo-1 WELDING AMPERAGE AC or DC+ Ø (mm) 3.2 4.0 5.0 MIN 80 110 140 MAX 110 150 190 OTHER DATA Electrodes that have become damp should be re-dried at 150 o C for 1 hour. RELATED PRODUCTS Please contact our Technical Department for detail. WI-0304 DS135 NS-ECo-12, Rev. 0, Date 01.09.2008