Which two aspects are important for safety before welding is performed?

Isolation of equipment and environmental conditions are indeed critical aspects of safety before welding begins. Proper isolation ensures that all equipment is de-energized and secured, preventing accidental activation of machinery that could lead to serious injuries. This encompasses not only electrical isolation but also ensuring that any pressurized systems, like gas or hydraulic lines, are safely handled.

Furthermore, assessing environmental conditions is vital for the safety of the welding operation. This includes monitoring factors such as ventilation to prevent the accumulation of harmful fumes and gases, controlling flammable materials in the area, and ensuring adequate lighting for visibility. Together, these safeguards create a safe working environment that reduces the risk of accidents and health hazards associated with welding tasks.