You don't have much to worry about when it comes to getting Argon Poisoning. Argon itself is not classified as a poisonous gas, so getting poisoning from Argon is not possible. That being said, Argon can still be a very lethal and dangerous gas to work with, especially if you inhale way too much of it.
Welder's Lung, or referred to as Pneumosiderosis, is a lung disease that occurs with constant exposure to iron dust. Welder's Lung commonly develops in welders, but usually takes years of working in the industry for symptoms to show. With chronic exposure to iron dust, people have also been known to develop Interstitial Lung Disease, Chronic Bronchitis and the worsening of Pneumosiderosis symptoms.
Welder's flash is a sensation of burning in your eyes that occurs after you have worked with a welding torch. Formally, the condition is called a corneal flash burn. It results in inflammation of the cornea. Some people also refer to the condition as arc flash burns. The cornea is the surface of the eyeball. In most cases, arc flash burns affect both of the eyes rather than just one.