Spot welding can work well if it's done right.
A LOT of spot welding work occurred in this county (Chemung [sheh-mung] County, NY) years ago when MANY fire engines (trucks), fire aerials, and emergency rigs such as ambulance and rescue vehicles were being built by both American LaFrance and Ward LaFrance.
Obviously NOT the type of vehicle one would want to see fall apart—if any!
FWIW,
A spot welding demonstration....