Is the welder's operation certificate useful? The welder's operation certificate is simply called welder's certificate, which can be used all over the country. It is impossible to operate electric welding without a license. So, where can I get a welder's drill to testify in Nanjing? Nanjing Gu Ning Vocational Training School is a professional welder operation certificate training school, with many years of experience in welder operation certificate training. I will summarize the experience of learning welder operation certificate for you. Welder's certificate is different from other certificates, mainly divided into two types. One is the welder's license, that is, the welder's special operation certificate, which is issued by the safety supervision bureau; One is the welder qualification certificate, that is, the welder grade certificate, which is issued by the Human Resources and Social Security Bureau.