Metal Welding is a fabrication process to join two metal pieces of same or different type by causing coalescence. Welding is generally done by melting the work pieces with heat & sometimes pressure, and introducing a filler metal to create a weld pool. After cooling, this weld pool becomes a strong joint.
Arc Welding is a type of welding that uses a welding power source to create an electric arc between the electrode and the base material to melt the metals at the welding point. They can use either Direct (DC) or Alternating current (AC) and consumable or non-consumable electrodes. The welding region is covered with some shielding gas or some slag.

Metal Welding is a fabrication process to join two metal pieces of same or different type by causing coalescence. Welding is generally done by melting the work pieces with heat & sometimes pressure, and introducing a filler metal to create a weld pool. After cooling, this weld pool becomes a strong joint.
Arc Welding is a type of welding that uses a welding power source to create an electric arc between the electrode and the base material to melt the metals at the welding point. They can use either Direct (DC) or Alternating current (AC) and consumable or non-consumable electrodes. The welding region is covered with some shielding gas or some slag.