The registration time of welder certificate is not limited. You can register at any time After registration, you need to complete the training before you can take the exam. You have to take the exam at least twice a month, and it will take three days to verify it. The welder's job responsibilities are: 1. According to the requirements of production tasks, complete the welding work of various production tasks in time. 2. Before work, check whether the welding equipment is in good condition and whether the tools used are complete. 3, after the work, should be clear after work, cut off the power supply in time, put away the handle line, count the tools and leave the scene.