Crack in neck of hollow shaft is a very serious malfunction, main cause of the crack include: foundry defect, centralized stress, quality problems of welding and heat treatment.
中空轴轴颈裂纹是水泥磨的严重故障。中空轴轴颈裂纹产生的原因主要有：铸造缺陷，应力集中，焊接和热处理质量问题等。
It easy to occur defect on the back of bead in pressure pipe TIG welding, which can be solved by using the anti, direction wire feeding method successfully.
压力管道TIG焊在焊接中焊道背部易出现缺陷，用反向送丝的方法成功地解决了这一问题。
The paper introduced briefly produce quality control in pressure vessel′s shell and manhole nozzle welding, how avoided crack and found defect by ultrasonic testing after welding.
介绍了压力容器人孔接管与厚壁筒体相焊时，如何控制产品的质量，避免产生裂纹，焊后通过超声波检测及时发现缺陷。
Taking a defect example that manhole is close to vertical welding this article introduces how to treat the defect in replacement of partial bottom wall.
以罐壁开孔距纵向焊缝过近缺陷的处理为例，介绍底圈局部壁板的更换方法。
Grey spot has become the most conspicuous defect in resistance welding joint of the structure of continuous welded rail track.
灰斑已成为无缝线路钢轨结构接触焊接头最突出的缺陷。
In this article defect occurring reason was analyzed and hold that the defect was caused by the special welding structure of the stainless steel clad plate and fabrication process.
文中对缺陷产生的原因进行了分析，认为缺陷系不锈钢复合钢特殊的焊接结构和制造工艺所致。
This paper researches the effects of undercut defect on stress concentration in welding joint of pressure pipe by means of the finite element method software ANSYS.
从数值模拟入手，采用大型有限元软件A NSYS研究了不同尺寸、不同位置的咬边缺陷对压力管道焊接接头应力集中系数的影响。
Plasma produced in laser welding process has shielding effect to the laser beam and decreases the melting depth on even result in the defect.
激光焊接过程中产生的等离子体对激光束有屏蔽作用，降低了焊接熔深，甚至出现缺陷。
Method of calculation of defect site by ultrasonic inspection of indined plane welding has been described in detail, and formula have also been proved.
详细介绍了在斜面焊口超声波探伤中采用声程调节扫描比例进行缺陷定位的计算方法，并给出了计算公式。
This paper introduces the method to the defect location in the scarf welding joint by ultrasonic test, which can be adopted in the construction site.
探讨了斜面焊接接头超声波探伤中缺陷定位的方法，可供现场施工实际探伤时采用。
The results show that the partial unmelted region, casting defect structure and secondary crack form in the welding seam, which result in the low stress breakage of the samples.
结果表明：在焊缝区域内存在着局部未熔区以及铸造疏松组织和二次裂纹等缺陷，这是导致试样低应力断裂的根本原因。
In order to decrease weld defect, the upper limit welding current should be adopted.
为避免夹渣的产生，在焊接P91焊口时，宜采用焊接工艺评定电流上限焊接。
In order to decrease weld defect, the upper limit welding current should be adopted.
为避免夹渣的产生，在焊接P91焊口时，宜采用焊接工艺评定电流上限焊接。
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