Xuzhou Technician College has many courses in spot welding, including short training, riveting for three years and junior college for five years! The tuition fee for short-term training is similar to that for one year in a technical secondary school, but you can't learn much. Three years of riveting belongs to secondary school, and I came out as an intern in the last year of the second year of school. My diploma of technician college is intermediate, and the certificate issued by five-year junior college is advanced skill certificate, which involves a little more knowledge than that of secondary school. Besides, it's not much different from three years. I suggest you study for three years. Xuzhou Technician College has its own website, where you can view more detailed professional contents by yourself.