Things are, without a doubt, going to break in SHTF. Tools, farm implements, and even vehicles that are still functioning will suffer mechanical damage. When two pieces of metal brake, you are going to want to join them back together and one way of doing so is through welding.
If you don’t enter SHTF with a welder, or don’t have the money to purchase one now, rest assured, you can make one that is pretty inexpensive. This video series from the King of Random shows you how to make a welder from two old discarded microwaves, some wire, wood, and copper tubing. Be very careful if you attempt to undertake this project, this could be very dangerous..