Nickel Base AlloysSlide 2
Resistance Welding Learning Activities View Slides; Read Notes, Listen to address Do on-line exercise manual Lesson Objectives When you complete this lesson you will comprehend: KeywordsSlide 3
Fe (9.7) AWS Welding HandbookSlide 4
Nickel Base Alloys Can Be Divided into Categories Commercially Pure Nickel Solid-Solution Alloys Precipitation-Hardenable Alloys Dispersion-Strengthened Alloys (ThO 2 ) Ni-Ti Shape Memory AlloysSlide 5
Decker, R., Strengthening Mechanisms in Nickel-Base Superalloys, International Nickel, 1970Slide 6
AWS Welding HandbookSlide 7
SS ppt immaculate disp Pure Fe = 9.7 Note Variation AWS Welding HandbookSlide 8
Pure Nickel - Alloy 200 Food preparing hardware Caustic taking care of gear Chemical Shipping drums Electrical & electronic parts Susceptible to graphitization at grain limits at hoisted temperatures. Compound 201 Used for administration over 600F in light of the fact that: Has low carbon which elevates expanded imperviousness to graphitization at raised tempsSlide 9
Solid Solution Nickel - Copper (400, R-405) Resistance to Sea Water, chlorination Naval Application, Chlorination Plants, Water meter parts, pump shafts, bolster water radiators Nickel-Chromium (600, 601, 690, 214, 230, G-30, RS-330) Corrosion Resistance at Elevated Temp Furnace suppresses, warm treating gear, atomic steam tubing, warm exchangers, flying machine motor segments Nickel-Iron-Chromium (800, 800HT, 825, 20Cb3, N-155, 556) High Temp Strength, Resistance to Oxidation Heat exchangers, carborizing installations, pickling tank radiators, spent atomic fuel component recuperation, hydrofluoric corrosive creationSlide 10
Solid Solution Nickel-Molybdenum (B, B-2, N, W) Low temp erosion resistance, a few acids Cryogenic Service Nickel-Chromium-Molybdenum (C-22, C-276, G, S, X, 622, 625, 686) Corrosion resistance at room temp Cobalt-Chromium-Nickel-Tungsten (L-605, 188, S-816, 54Co-26Cr) Sensitive to Copper defilementSlide 11
Precipitation-Hardenable Alloys Gamma Prime Precipitate Nickel-Copper Alloys (K-500) Resistant to Sea Water, Chlorine Pump shafts, impellers, oil well bore collars, electronic segments, springs Sensitive to strain age breaking Nickel-Chromium (713C, X-750, U-500, R-41, Waspalloy) Al-Ti-Nb fortifying Good high temp oxidation Gas turbine segments Nickel-Iron-Chromium (901, X-750) Forging applications by and large not weldedSlide 12
Relative Weldability of PPt Alloys AWS Welding HandbookSlide 13
Thorium Dispersion Strengthened Nickel TD Nickel High Temperature Strength Thermal Shock Resistance – Used for Turbine segments TD NiCr High Temperature Strength Oxidation and Sulfidation Resistance Can have impressive loss of quality in weld, because of agglomeration or development of thoria dispersoid. Fansteel Metals Division Bulletin,Slide 14
Ni-Ti Shape Memory Alloy 55Ni-Bal Ti Reversible Martensite Potluri, N. "Joining of Shape Memory Alloys" Welding Journal, March 1999Slide 15
Spot Welding Because of wide varieties in properties Exact welding conditions shift broadly Electrical Resistance Range from 9.5 to more than 130 smaller scale Ohm Cm (1-13 times that of Plain Carbon Steels) Welding Current like steel for low resistance Current lower for higher resistance amalgams Short Weld Time Because of brief time, for the most part no climate required Strength Range from 0.8 to 3.8 circumstances Plain Carbon Steel For Lower Strength Materials Same Force Levels For High Strength (at Elevated Temp) Higher Forces a. Ejection = Force too low b. Cathode Mushroom = Force too highSlide 16
Spot Welding 5-8" For heavier material 0.06-0.125" For thin material up to 0.06" If tip adhering go to 10 o Resistance Welding Manual, RWMASlide 17
AWS Welding handbookSlide 18
Spot Welding Thicker Gage 73Ni-16Cr-7Fe-3Ti Resistance Welder Manufacturers Association Bulletin # 26Slide 19
Spot Welding Thicker Gage 73Ni-16Cr-7Fe-3Ti Thickness Resistance Welder Manufacturers Association Bulletin # 26Slide 20
Spot Welding Frequency Converter AWS Welding handbookSlide 21
Spot Weld Defects Hot Cracking lower S&P fashion constrain Coring higher R in GB Constitutional Liquation Reduce particles in HAZ Sulfur HAZ Surface Cracking Oil, Grease, Marking Pencil on Surface Resistance Welding Manual, RWMASlide 22
Projection Welding Seldom Projection Welded on the grounds that Production Runs are generally little Higher Weld Forces and longer weld times required than for Plain Carbon Steel as a result of higher lifted Temperature StrengthSlide 23
Cross Wire Welding Resistance Welding Manual, RWMASlide 24
Seam Welding Intermittent Pulse, Intermittent Roll, Forge Force Possible No Intermittent Roll, No Forge Possible Roll Spot Weld Upper Electrode Wheel Knurl or Friction Drive Wheel Overlapping Seam Weld Class 1 or 2 Rolls Burnished to Prevent Sticking Continuous Seam Weld Workpiece Throat [Reference: Welding Handbook, Volume 2, p.553, AWS] Lower Electrode WheelSlide 25
Seam WeldingSlide 27
Flash Welding Higher surprise compel in light of higher hot quality than plain carbon steel Higher Clamping Forces on the grounds that higher miracle powers Die smolder = Insufficient Clamping Force Resistance Welding Manual, RWMASlide 28
Flash Welding Jaw dispersing less in light of the fact that higher resistance Higher resistance may bring about some centerline dissolving High glimmering speeds (allegorical versus direct) and shorter blazing circumstances used to limit weld tainting. Vexed separation adequate to get all liquid material out Resistance Welding Manual, RWMASlide 29
Flash Welding Current Flow During Upset If blazing current is cut off before miracle, oxide shapes at centerline Resistance Welding Manual, RWMASlide 30
Welding Handbook, AWSSlide 31
Some ApplicationsSlide 32
Resistance welding Electrode to Spark Plug Nickel (regularly Inconel 600) Sheath Copper Core Electrode Weld to Steel Plug Body Chiu, R, "Start Plug with Copper Cored Ground Electrode and a Process of Welding the Electrode to a Spark Plug Shell" US Patent 5,530,313 Jan 25, 1996Slide 33
Welding of a present authority in a Ni-Cd Coil Wound Battery Ni Separator Cd Nickel strip (3&4) resistance spot welded to nickel plated steel gatherer plate (7&8) Nakamaru, H, et al, "Round and hollow Storage Battery" US Patent 6,013,389 Jan 11, 2000Slide 34
Method For Replacing Blade Tip of Directionally Solidified and Single Crystal Blades (Tips to anticipate spillage of Compressed Air Between Blade and Shroud) Resistance Weld Rene N5 (single Crystal) Rene 142 Dir. Hardened Air Holes Blade Cross Section Bewlay, B, et al "Technique for Replacing Blade Tips of Directionally Solidified and Single Crystal Turbine Blades", US Patent 5,822,852 Oct 20, 1998Slide 35
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