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The extension of the welding site can be verified by the following tests specified by ASTM: bending 45 °, bending to 90 °, and leveling along the weld; Then turn the galvanized steel corrugated tube with a seam tube to repeat the above steps so that the inner diameter of the weld reaches 180 °. The standard of weld quality passing is that tearing or intercrystalline separation is not allowed when magnified by 40 times. The bending radius of the pipe is controlled by the composition of the alloy, and the minimum bending radius is generally 2D. The ideal welding condition is that the weld is neutral or under pressure. Moreover, the pipe should be annealed to reduce its hardness and thus improve bending performance.