| Any child can play this simple game. Take a full blown rose and hold it up where all can see it, then let them write on a slip of paper how many petals they think are in the rose. The petals are then counted by one of the children and the o... Read more of ROSE GUESS. at Games Kids Play.ca |  InformationalPrivacy |
Steel MakingMushet And BessemerThat Mushet was "used" by Ebbw Vale against Bessemer is, perh... Complete Calibration Of Pyrometers For the complete calibration of a thermo-couple of unknown e... Flange Shields For Furnaces Such portable flame shields as the one illustrated in Fig. 1... Carbon Tool Steel Heat to a bright red, about 1,500 to 1,550 deg.F. Do not ham... Standard Analysis The selection of a standard analysis by the manufacturer is t... Steel For Chisels And Punches The highest grades of carbon or tempering steels are to be re... Take Time For Hardening Uneven heating and poor quenching has caused loss of many ve... Process Of Carburizing Carburizing imparts a shell of high-carbon content to a low-... Hardening Operation Hardening a gear is accomplished as follows: The gear is tak... The Forging Of Steel So much depends upon the forging of steel that this operation... Carburizing By Gas The process of carburizing by gas, briefly mentioned on page ... Cutting-off Steel From Bar To cut a piece from an annealed bar, cut off with a hack saw,... Pyrometers Armor plate makers sometimes use the copper ball or Siemens' ... Silicon Silicon prevents, to a large extent, defects such as gas bubb... Rate Of Absorption According to Guillet, the absorption of carbon is favored by ... Quenching The Work In some operations case-hardened work is quenched from the bo... Tempering Colors On Carbon Steels Opinions differ as to the temperature which is indicated by t... Annealing Method Forgings which are too hard to machine are put in pots with ... The Modern Hardening Room A hardening room of today means a very different place from ... Quality And Structure The quality of high-speed steel is dependent to a very great ... |
Preventing Carburizing By Copper-platingCategory: CASE-HARDENING OR SURFACE-CARBURIZING Copper-plating has been found effective and must have a thickness of 0.0005 in. Less than this does not give a continuous coating. The plating bath used has a temperature of 170 deg.F. A voltage of 4.1 is to be maintained across the terminals. Regions which are to be hardened can be kept free from copper by coating them with paraffin before they enter the plating tank. The operation is as follows: Operation No. Contents of bath Purpose 1 Gasoline To remove grease 2 Sawdust To dry 3 Warm potassium hydroxide solution To remove grease and dirt 4 Warm water To wash 5 Warm sulphuric acid solution To acid clean 6 Warm water To wash 7 Cold water Additional wash 8 Cold potassium cyanide solution Cleanser 9 Cold water To wash 10 Electric cleaner, warm sodium Cleanser to give good hydroxide case-iron anode plating surface 11 Copper plating bath of copper Plating bath sulphate and potassium cyanide solution warm There are also other methods of preventing case-hardening, one being to paint the surface with a special compound prepared for this purpose. In some cases a coating of plastic asbestos is used while in others thin sheet asbestos is wired around the part to be kept soft. Next: Preparing Parts For Local Case-hardening Previous: Carburizing By Gas
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