Welded pipe is fabricated by uncoiling & leveling steel strip, roll forming, high-frequency resistance welding or spiral submerged arc welding, weld bead grinding, stress relief heat treatment, hydrostatic test and non-destructive inspection before fixed cutting. Divided into straight ERW pipe and spiral SSAW pipe with precise dimension, smooth weld, good pressure tightness and competitive cost. For municipal water/gas/heat pipelines, scaffolding, guardrails, agricultural irrigation and industrial fluid conveying.