预测可能存在的气泡、熔接痕的位置，确定最佳浇口位置，并在此基础上设计模具。
In order to obtain the best gate location addition, the position of air bubbles and weld lines were forecasted.
管材外壁光滑、平整、无气泡、裂口和明显痕纹凹陷、色泽不均及分解变色线。
Pipe wall smooth formation, no bubbles, nicks and obvious scar patterns Depression, color and uneven discoloration decomposition line.
管子应通体均匀，无裂纹、无孔眼或杂质，还应无气泡、凹痕、波痕、拉模划痕和热痕。
Pipe shall be homogeneous throughout, free from cracks, holes or foreign material, and shall be free from blisters, dents, ripples, die and heat marks.
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