Posts tagged as welding

Leaving Cert. Engineering Revision Notes – Index

Polymers Condensation & Addition Polymerization General definitions Thermoplastics vs. Thermosetting plastics Joining Mig & Tig Welding Manual Metal Arc welding Oxy Acetylene welding Submerged Arc & Resistance seam welding Material Testing Material Properties General Definitions & Properties Non-Destructive Testing Destructive Testing Internal Structures of Materials Bonding Structure Defects Cooling Curves… Continue Reading →

MIG & TIG Welding – Engineering notes

MIG welding Semi automatic process. A consumable bare wire electrode fed continuously into the weld pool through torch by spool. An inert gas, e.g. argon, has a fluxing action and creates a protective shield around the weld pool. The feed and flow rate are set by the operator. Does not produce slag…. Continue Reading →

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 process. Used on Low carbon steels. E.g. Ship building and… Continue Reading →

Manual Metal Arc welding (MMA) – Engineering

1. Circuit Step-down Transformer Converts high voltage AC to a lower voltage (220V to 80V-100V). This means the output current is greater than the input current. This is due to the primary coil having more windings than the secondary coil. Smoothing Capacitor Produces a more uniform direct current by smoothing… Continue Reading →