Tong Shen roll round, plus, the next head, two welding, a longitudinal welding; carbon dioxide gas shielded arc welding and arc welding; hydraulic test pressure of 2.1MPa; use temperature range -20
~ +55 ; driver gas: Nitrogen 1.2MPa (20 ); quality, reliable, price concessions
Tong Shen roll round, plus, the next head, two welding, a longitudinal welding; carbon dioxide gas shielded arc welding and arc