The topic of the impact of electromagnetic fields on human body is nowadays very actual. One of the physical factors of the work environment is the electromagnetic fields emitted by the electric devices. The effect of electromagnetic fields on human body is various and depends mainly on frequency and intensity. Electromagnetic fields create a wide range of resources with which the workers can meet in their workplace. They are developed and used in many work activities including manufacturing processes, research, communication, medical applications, production, transmission and distribution of electricity, broadcasting, aviation and maritime navigation and security. This contribution describes the impact of electromagnetic fields on human body during welding. The shape and intensity of the generated electromagnetic fields were measured by a three-axis magnetometer.