Shanghai Duomu Industrial Co., Ltd. is the first equipment manufacturer in China that integrates R&D, production and sales with high energy, low consumption and practicality. R&D, production and sales of high-energy plasma arc powder cladding surfacing machine series, practical plasma arc welding machine series and precision short arc welding machine series have reached the domestic leading level. However, the successful development of 90KV power supply for airborne geomagnetic exploration has made outstanding contributions to the national exploration cause and filled the domestic gap.