It is a welding process that is used to join metal to metal by using electricity to create enough heat to melt metal.
It is a fussion welding process where joining takes place by an electric arc shielded by co2 gas and electrode is consumable.
Like TIG, MIG welding also uses a shielding gas to protect the weld pool from potentially damaging atmospheric gases
A press fit or friction fit is a fastening between two parts which is achieved by friction after the parts are pushed together
In this electrical resistance of material combined with the time and the force is used to hold the materials together.