opTech Ltd. was founded in Beijing, the capital and main transportation city in China. With more than 10 years experience in welding and cutting industry, we had R&D our advanced welding and cutting equipment. Mature teams, included sales team, marketing team, production team and after-service team, supply professional service for customers. Strictly follow ISO 9001:2000 world quality management system. Factory Intorduction TopTech Ltd. factories are located in Beijing and Tangshan. In order to have professional products line, each factory has specificity producing department, testing department.