... , piling pipeManufacture processesRaw material Test-Uncoiling-Strip leveling-End Cutting-End Shearing and welding-Accumlator-Forming-Telepathy Welding-Seam Heat Treatment-Air ... test, charpy impact test,metallographic examinationFinal product testhydraulic test,on-line and off- line ultrasonic test, tensile test,yeild strength,elogation hardness test ...