Terminologies and Classification - Blog 7 - Yukta Yogeesh

 26/August/2020


Today's session was more properties of Steel and similar metals for learning more details and workability with different ways and methods: - 

 

Galvanic Action 

Higher end is anode and at the lower end is th cathode. When current is passed through a combination of metals, the one at the higher end will corrode first. 


Co-efficient of thermal expansion 

Charge/length of materials/degree of change in temperature


Specific Gravity

Density of substance/ Density of water 


Tensile/Yield strength 

Tensile strength is the maximum ability of the metal to withold stress, will show necking and will fail at a point called fracture. 

Tield strngth is the maximum ability of the metal to exhibit elasticity after which it cannot undergo deformation and will become plastic.


Reflectivity 

p(y)=Gr(y)/Gi(y) 

Where P is the reflectivity, Y is the wavelegth, Gr is reflecting radiation, Gi is the incident radiation


Oil Canning 

An elastic buldging on metallic sheets, especially if it used for lare spans. Its also called stress wrinkling and is characterised by a pop sound. 

How to prevent oil canning - by the following ways - 

  1. Design - choice of materials 
  2. Thicker - higher quality
  3. Light color and less glossy
  4. Backer rod - at a regular interval
  5. Skilled workers 


Welding / Soldering 

It can support structures with less strength only. It is done using semi-automated tool, argon gas and TIG-Tungsten Inert Gas 


Joining 

  1. Rivet 
  2. Nut and Bolt
  3. Pin 


Mechanical Fasteners 

To create non permanent joints and to connect 2/ more joints together. 


Classification of Steel 


Tools 


Carbon 


  1. Medium carbon steel - 0.25%-0.6%
  2. High/hard carbon steel - 0.6-1.5%
  3. Low / mild steel - 0 - 0.25% carbon content 


Alloy - Adding appropriate elements to improve the desired quality of steel. 


Stainless Steel 

  1. Ferretic
  2. Martenestic
  3. Austenitic
  4. Duplex Stainless Steel
  5. PH- Precipitaion Hardening 


Yukta Yogeesh

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