MIG and TIG both are the best spot welders for auto bodies because both welding machines offer use on steel and aluminum, these are the most common metal materials which can be used on auto parts of most of the vehicle.
These are the types of welding in the automotive industry and most of the experts recommend TIG welder for auto body because
the use of this product is easy and as well It can handle a wider range of thicknesses of aluminum
because now time aluminum is used on auto, primarily because of its malleability and lightweight nature.
As well if you are not affordable that is the best option for you to go with a MIG welder and this also is the best type of welder for auto body framework.