缺陷类型包括点(斑)缺陷和大面积的不均一外观。未涉及条纹，模具痕或焊合线等条带型缺陷。

The defect type here includes pits (patches) and uniform appearance except for the defects such as streaks, die lines, weld marks and lines.

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本文对圆管型材制品，给出了一种切线分流桥的结构，能够减轻甚至避免圆管表面出现明显焊合线；

In this paper, a new design of tangent bridge structure was proposed, which can reduce or even avoid welding line.

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对一般的空心型材制品，由于挤压成形本身的工艺特点，不可避免的会在产品表面产生挤压焊合线，影响到产品的表面质量。

For common hollow sections, welding lines on the surface are inevitable due to their forming characteristics, which damage their surface integrity.

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