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Welding Revision

Welding Revision. LC Engineering. Gas Welding Revision. Stages of combustion Primary Combustion – Acetylene & Oxygen burn in the primary combustion zone to give off Carbon Monoxide and Hydrogen. C2H2+O2 2CO+H2

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Welding Revision

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  1. Welding Revision LC Engineering

  2. Gas Welding Revision Stages of combustion Primary Combustion – Acetylene & Oxygen burn in the primary combustion zone to give off Carbon Monoxide and Hydrogen. C2H2+O2 2CO+H2 Secondary Combustion – oxygen is sucked in from the weld pool and is burned with Carbon Monoxide & Hydrogen to give off Carbon Dioxide and Water vapour. CO+H2+O2 CO2+H2O

  3. Types of Flames The Oxidising Flame This is a result of excess Oxygen. Approx 1.5 parts oxygen to 1 part acetylene. If used with steel the excess oxygen would contimnate the joint, so it is used for copper and some bronzes. It has a temp. of about 3500ºC max temp zone inner cone secondary combustion zone

  4. The Carburising Flame This is a result of excess Acetylene. Approx 0.9 parts oxygen to 1 part acetylene. Has a temp of approx 3150ºC and is used for welding alloy steels and aluminium alloys max temp zone inner cone secondary combustion zone C Acetylene feather

  5. Transformer/ Rectifier Transformer Rectifier • Dropping Voltage means current increases current, which is needed for welding. • There is a primary and secondary coil. • The number of windings on each coil controls the output current. • Primary 100 Turns and 220V and 10A • Secondary 200 coils = 110V & 20A • The Rectifier converts AC to DC. • It uses 4 diodes arranged in a diamond shape. • 2 diodes conduct in each half-cycle. • The capacitor ensures a smooth output.

  6. Transformer/Rectifier

  7. MIG/MAGS • Metal Inert Gas/Metal Arc Gas Shielded. • Semi-automatic Process • Consumable Electrode fed automatically. • Argon gas protects the weld pool like a flux. • No slag produced. • Suitable for steel. Argon Gas Wire Feed Welding Gun Electrode Power Plant NOTE: CO2 welding is a form of MIG/MAGS

  8. TIG/TAGS • Tungsten Inert Gas • Non –consumable Electrode. • Filler rod used. • Argon gas protects the weld pool like a flux. • Suitable for Aluminium& Stainless Steel. Filler Rod NOTE: Label the diagram using MIG/MAGS as a reference.

  9. A Transformer steps up and down the voltage to set welding currents. • The Rectifier converts AC to DC using a series of diodes.

  10. Resistance Spot Welding

  11. Resistance Seam Welding

  12. Submerged Arc Welding

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