Welding is the result of a combination of heat and pressure to melt materials joining them with a filler material. It can be performed in many ways using different energy sources gas flame, electric arc, laser, friction, ultrasound & electric beam. Arc welding is a basic welding process which requires a power supply, electrodes, welding rods, shielding gas, and proper safety equipment.
Although the welding process is common, it may also be a potentially dangerous one.
Protective equipment is the most important requirement for persons engaged in a welding activity, since an open electric arc or flame is often involved and the probability of injury is great.