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LC Engineering
LC Engineering
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Submerged Arc & Resistance Seam Welding – Engineering

Submerged Arc Welding

  • Uses bare wire electrode.
  • Fed automatically from spool.
  • Generates electric arc to heat metal/
  • Flux in powder form.
  • Fed using a hopper.
  • Electric arc melts joint, flux and electrode.
  • Excess flux is collected and re-used.
  • Fully automated... (More)

Iron Carbon Equilibrium Diagrams – Engineering Notes

Lower Critical Point

  • Occurs at 723°c.
  • Temperature change occurs.
  • The metal contracts dimensionally, glows less brightly and loses its magnetism.
  • Known as Decalescence.

Upper Critical Point

  • Varies depending on amount of carbon in the steel.
  • Above this point, the metal... (More)

Heat Treatment – Engineering Notes



  • The piece is heated to a cherry red colour and then cooled rapidly in water oils and brine.
  • At the cherry red colour the steel will have undergone structural changes (FCC to BCC, martensite) and the rapid cooling... (More)

Polymers – Condensation & Addition Polymerization

Monomer: A monomer is a molecule of a compound which reacts with other monomers to form a polymer.

Mer: A mer is a repetitive unit in a polymer.

Addition Polymerisation of Ethylene (Thermoplastics)

  • Ethylene consists of 4 hydrogen atoms and... (More)