Final answer:
Oxygen and fuel gas container valves must be accessible for safety, quick emergency control, and immediate adjustments during welding or cutting processes, to prevent accidents and maintain proper combustion.
Step-by-step explanation:
Oxygen and fuel gas containers should have their valves accessible to the torch operator or fire guard to ensure safety and quick control in the event of a fire or other emergency.
As gases like oxygen and acetylene are essential in welding and cutting processes, the ability for the operator to rapidly adjust the flow or shut off the supply can prevent accidents or exacerbation of dangerous situations. Quick access to these valves also allows for immediate response to changes in flame characteristics, avoiding improper combustion and potential hazards.