Chongqing Yunda Technology Co., Ltd. was established in 2009, it is a wholly owned subsidiary of Shenzhen Jastic Technology Co., Ltd., and its predecessor was Chongqing Yunda Mechanical and Electrical Equipment Co., Ltd., it is an integrated company of autonomously research and develop, production, sale and services of internal combustion and convert welding equipment, it is the only one of the professional internal combustion arc welder manufacturers among top 50 welders in China. It specializes in providing the professional equipments such as the welding generator, engine driven welding machine, mechanical wrench, internal combustion arc welding work station, pipeline self-insurance welding for China railway, PetroChina, Sinopec construction units and outdoor construction without power supply. It is a director general of Chongqing Welding Association and a national hi-tech company with more than 10 national scientific and technological achievements and several patent technologies.