... stations roll-plastic equipment, rolled into equilibrium, high strength, sound thickness with the standard of GB/T 4454-1996.4 Guardrail and ... , welded by robot make the product solid, no glitches, no bubbles, no welding scars, and does not need to re-polished ... production of products is well-known for its excellent quality, sound thickness, high degree of stability and balance, without porosity ...