Chongqing Yunda Technology Co., Ltd was founded in 1993, it is a professional manufacturer of engine driven welding machine, gasoline&diesel generator, etc., which focus in rail-welding, oil&gas pipeline welding area. We are the sole engine driven welding machine manufacturer in China top 50 welding machine manufacturers and the appointed supplier of China Railway, CNPC, and SINOPEC. â??Yundaâ?? series products include: 1.Pipeline welding workstation(H1000, H800, H500, H400)----applied in oil&gas pipeline welding , 2.Engine driven DC welder(H300, H200, H200-LX)------applied in rail welding , also for oil&gas pipeline welding. 3.Welder&Generator(H230, WG6500, WG3500)----- applied in lower industrial welding, emergent lighting, urban facilities & pipeline maintenance. 4.Pipeline inverter welder(ZX7-ST-SY, ZX7-S-SY, YH500, YH-G3)----applied in oil&gas long pipeline welding. The detailed information of the products are showed on our website *****. â??Yundaâ?? series products are very popular in China railway and oil&gas pipeline transportation industry for itâ??s top-quality, and good service, they are also exported to oversea markets in large batch along with China Railway, CNPC, and SINOPEC.