Was his vehicle insured? If so, obviously, his insurer needs to adjust the claim with you. If NOT, then you need to settle up with the driver / vehicle owners for the damages done.
You have a number of steps you can take. You can contact the welder, ask for his insurance, file an SR-1, provide property damage estimates for payment, file an action in small claims or the limited or the unlimited jurisdiction of the court, or contact your own insurance regarding the property damage.
If you have insurance, call your insurance company and let them handle it. That is what you pay them for. If you don't have insurance, you are going to need to pursue the other driver. If you need a lawyer, you are going to need to pay one. Whether it is worth it to do so or not depends on the amount of money it is going to take to repair or replace your car.
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