If you are a hobbyist welding in your garage, you can skip 4G. You will never need it. However, if you want to earn a living with a hood on, It is brutal, it is hot, and it will humble you.
If you plan on repairing heavy equipment (under a dozer), welding trailer hitches while lying on a creeper, or fixing a pipe rack in a refinery, you will live in 4G. It simulates field conditions perfectly. The Bad: The Physical & Mental Toll 1. The "Rain of Fire" (The biggest con) I cannot stress this enough: Spatter has to go somewhere. In 4G, that somewhere is your neck, your gloves, your pockets, and your boots. Even with a leather jacket and a skull cap, hot slag will find a way inside your collar. You will leave a 4G test booth smelling like burnt hair and regret.
Rating: ⭐⭐⭐⭐ (4.5/5 – Extremely Challenging but Essential)