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1·Defect categories and features of spiral seam cracking are studied based on spiral seam cracking facts in Northeastern Oil Pipeline Networks.

针对东北管网多次发生螺旋焊缝开裂事故的事实，研究了造成螺旋焊缝开裂事故的缺陷类型和特征。

2·The most common method is clipper and spiral seam. It can connect the filter fabrics and filter screens effectively into ring, long life time, no wrinkles.

最常用的是钢扣连接，螺旋连接，能有效将滤布、滤网连成环形，并且使用寿命长，滤布不打皱。

3·The defects will be found in the seam side with ultrasonic inspection but hardly found with X ray inspection as the small diameter spiral pipe production with the split strip steel.

采用纵剪带钢生产小口径螺旋焊管时，超声波检验经常在焊缝的一侧发现缺陷波，而X射线拍片检验却很难发现。

4·Inside welding seam cracking of spiral submerged Arc welded pipe is the unsolved problem for many years in the pipe field.

螺旋埋弧焊钢管内焊缝裂纹是本行业多年未解决的问题。

5·This paper introduces the measure, welding method and inspection result to prevent the welding deformation formation of spiral-seam pipe header after tapping.

介绍了在螺旋焊缝汇管上焊接支管时的防变形措施、焊接方法和检验结果。

6·The spiral welded pipe weld seam probe frame has the benefits that: (1) the flexible spindle is adopted, so that a probe and a weld seam can be fully closed, so as to reduce error;

本发明的有益效果是：1）采用柔性主轴，使探头和焊缝能保证完全弥合，减少误差；