What is the use of BYD's two welding machines?

BYD's two welding machines are not easy to do. BYD's second welder is a skilled worker, who needs to hold a valid IC card welder certificate and conduct internship assessment. Only by passing the examination can he take up his post. Working hours are from 8 am to 9 am every day. The job is hard and the salary is high. The average salary is 8000 yuan. It is not easy to be a technical post.