The key points for this module are:
The following are types of solid-phase welding
Forge Welding: In this welding type, parts to be welded are heated in a furnace and then hammered together to form the weld.
Butt Welding: The surfaces are brought into context and heated by an electrical current.
Friction Welding: THe required heat is generated through friction. One of the members to be joined remains stationary while the other is rotated at a high speed. The two members are brought together under an axial force.
Resistance Welding: This process uses the electrical resistance between the two members to be joined as a heat source.
Ultrasonic Welding is a process in which two components are held together, and oscillatory shear stresses of the ultrasonic frequency applied to the interface to cause coalescence.
Electron beam welding uses a very high-intensity beam of electromagnetic energy as the heating source for welding in the form of electrons, while laser beam welding uses a very high-intensity beam of electromagnetic energy as the heating source for welding in the form of photons.
Plasma arc welding is the welding process utilizing heat generated by a constricted arc struck between a tungsten non-consumable electrode and the workpiece.
There are two basic types of arc welding electrodes
Consumable: Consumed during the welding process. This is also the source of filler metal in arc welding.
Non-consumable: Not consumed during the welding process. Any filler metal must be added separately.
The following are types of liquid state welding:
Arc Welding: This uses a consumable or non-consumable electrode (rode or wire) and the arc is started by momentarily touching the electrode to the workpiece and then withdrawing it to a short distance.
Shielded Metal Arc Welding: This uses a consumable electrode consisting of a filler metal rod coated with chemicals that provide flux and shielding. It is sometimes called stick welding.
Gas Metal Arc Welding: This uses a consumable bare metal wire as an electrode and shielding is accomplished by flooding the arc with a gas.
Gas Tungsten Arc Welding: This uses a non-consumable tungsten electrode and an inert gas for arc shielding. It is used with or without filler metal.
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