试验结果表明，穿管坯料上存在的原始缺陷是产生螺旋裂纹的内在因素。
The study shows that the primary defects on the round billet used for piercing are the sources of screwy surface cracks.
而减径变形中的扭转变形不但使原始缺陷形成螺旋状，同时还进一步扩展了裂纹。
The distortion deformation during diameter reduction not only changes the primary defects (such as hair-line seams) into screwy form, but also enlarges the primary cracks.
它向项目团队提供追踪性，这样一旦在测试运行期间发现了什么问题，就可以输入缺陷，并追踪原始请求的备份。
This provides project teams with traceability so that when issues are found during test runs, defects can be entered and tracked back up to the originating requirements.
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