An electric welding machine is a device used to join metal parts by using electric current to produce intense heat that melts and fuses the metals together. It is widely used in construction, metal fabrication, repair work, and workshops. The machine typically consists of a power source (transformer or inverter), welding cables, an electrode holder, a ground clamp, and control knobs for adjusting the current. It is commonly used for arc (stick) welding, where a coated electrode is used to create the weld.

In operation, the workpiece is first connected to the ground clamp, and a welding electrode is fixed into the electrode holder. When the machine is switched on, it supplies electric current that creates an arc when the electrode touches and slightly lifts from the metal surface. This arc produces very high heat, melting both the electrode and the base metal. The molten metal forms a weld pool, which cools and solidifies to create a strong joint. The operator moves the electrode along the joint line to form a continuous weld. After welding, the slag formed on the surface is chipped off to reveal a clean weld, and the machine is switched off.