Whether you are building a car for the demolition derby or you are looking to add support for an off-road rig, a roll cage is the best way to do it. Metal tubing and steel plates are the strongest and most durable component options for a roll cage, but crafting the cage from these materials will require you to weld the components together as well as weld the cage in place inside the vehicle.
Your home or place of business likely has a lot of metal within it, even if you don't fully realize it. Your HVAC system, your plumbing, and perhaps even your roof are made out of metal of some type. If you run a business of an industrial nature, you may use lots of metal within your equipment or production line. If your property sustains serious damage somehow, you will of course want to get things back up and running as soon as possible.