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About Product:Argon arc welding and CO2 shielded welding (in accordance with GB/T8810-1995), after the oil, shot blasting, galvanized, passivation treatment, the user outside the environmental protection polyurethane electrostatic powder spraying; Steel tube diameter and wall thickness should be selected to ensure the strength requirements; 2. Platform and ladder type steel plates (Q235, thickness ≥2.0mm) shall be cold-rolled plates conforming to the requirements of GB/T700-2006. Argon arc welding and CO2 shielded welding (conforming to the requirements of GB/T8810-1995) shall be used for welding