Gas shielded welding is the main method. It's nothing to work overtime, it's counted by working hours. Shanghai Sany Technology Welding 12 yuan/hour. However, the standard working hours of parts are determined by the process. Sometimes after an hour's work and half an hour's work, they can be kicked out. Sometimes if there is less work in the factory, the salary will be less, so it is more work. Working hours are not particularly strict. If you want to work overtime, you should rush to the special school, depending on the output.