The weld of the large-diameter lsaw steel pipe for piling is longer than the weld of the straight pipe of the same specification, and the pressure of the spiral steel pipe under the same specification wall thickness. The defect of the […]
The weld of the large-diameter lsaw steel pipe for piling is longer than the weld of the straight pipe of the same specification, and the pressure of the spiral steel pipe under the same specification wall thickness. The defect of the […]