... the first developer and manufacturer of the Box-beam Automatic Welding Production Line. This production line combinest the ... 500 companies, for instance ,Shanghai COSCO kawasaki, Dalian Nanhai Group, Liaoning Ante STE, Qingdao Laigang Construction, Beijing Shougang Steel ... , Beijing Haidaer, Hebei Xinlei, Yantai Xinmou Group, Anhui Honglu Steel Structure, and so on.h-beam ...