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METAL FASTENING UNIT

METAL FASTENING UNIT. IDENTIFYING METALS 2 CLASSIFICATIONS OF METALS Ferrous-obtained from iron ore Non-ferrous-does not contain iron Alloy- combination of 2 or more metals - contains characteristics that make it different form original metals

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METAL FASTENING UNIT

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  1. METAL FASTENINGUNIT IDENTIFYING METALS 2 CLASSIFICATIONS OF METALS Ferrous-obtained from iron ore Non-ferrous-does not contain iron Alloy- combination of 2 or more metals - contains characteristics that make it different form original metals - made to improve the strength & quality of the metal - carbon is added to iron to make steel

  2. FERROUS METALS Mostly iron -iron-refined iron ore identified by magnetic and gives off sparks when applied to a grinding wheel -usefulness increased with the addition of carbon to create steel -combined with other metals, becomes very corrosion-resistant material called STAINLESS STEEL CAST IRON:

  3. Malleable=workable pour molten iron into a mold called a CASTING CHANNELLOCK VIDEO-TOOLS Ductile-metal can be bent slightly without breaking malleable cast iron Wrought Iron- pure iron-very malleable-resists rust-railing Mild Steel- workhorse of metals -tough -ductile -strong -malleable

  4. SHAPES OF STEEL FLAT BANDS I-BEAMS ANGLES RODS CHANNELS PIPE TEES TOOL STEEL Contains specific amount of carbon -permits it to be hardened Annealed-heat a metal to proper treatment & then slowly cool the metal

  5. Hardened- heating to proper temperature & than rapidly cooling the steel in water *degree of hardness is determined by controlling the temperature of the metal & the speed of cooling Tempering- controlled reheating & cooling of steel after it has been shaped Results: degree of hardness-relieves stress- prevents cracking STAINLESS STEEL

  6. Created by adding nickel & chromium to steel Plated Steel Steel is made rustproof by applying a coating of metal such as tin or zinc Zinc Coated- galvanized steel rust resistance depends upon thickness of the zinc coating-rated in ounces of zinc NON-FERROUS METALS Does not contain iron Examples: zinc-copper-aluminum-lead-tin ALUMINUM:

  7. -tough -silver color -lightweight -electrical conductor Corrosion- reaction of metals to liquids & gases that cause them to deteriorate or break down Copper Electrical conductor corrosion is slight Brass-60% to 90% copper & the remainder is zinc Bronze-copper, zinc and 10% tin LEAD

  8. solder-soft alloy used in making joints for metals TIN Temporary rust protectant MARKING METAL Steel-most commonly used metal TOOLS Scratch Awl Soapstone Scriber Dividers File Center Punch CUTTING METAL

  9. Hacksaw Cold Chisel File Snips Shears Using a hacksaw, select a blade fine enough to allow at least 3 teeth at a time on the metal surface Standard Blades: lengths-10” or 12” teeth per inch-14, 18 or 24 32 teeth per inch very small Thicker the metal, coarser the teeth Designed to cut on the forward stroke install blades with the teeth pointing away from the handle

  10. FILES Classified by-length, shape, design of teeth and coarseness of teeth 8” to 12” in length Shapes: triangular round flat half-round Single-Cut Files-straight teeth going in one direction Double-Cut Files-teeth going in 2 directions

  11. Both can be purchased in: coarse, second-cut medium and smooth fine grades Files cut on the forward stroke only Draw-filing: Placing the file at a 90 degree angle to the metal and pushing or pulling the file in this position Stock-refers to a piece of material SNIPS/SHEARS:

  12. Large scissor-like tools for cutting sheet metal Cold Chisel-piece of tool steel shaped, tempered and sharpened to cut mild steel Eye- piece of metal bent into small circles Anvil- heavy steel object that is used to aid in cutting and shaping metal

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