求大神帮手翻译一下，我请吃饭！！尽快哦！！

红海蓝雨 · 发表于 2014-3-25 19:22

Early lined pipe installation always required the lining to be rewelded to the pipe following the cut-out of girth welds. More recent project experience indicates that where the repair weld is made quickly after rebevelling the pipe end (so there is no risk of moisture getting into the gap) the repair girth weld can be easily done without the re-attachment of the liner.
During a number of projects in different parts of the world, fabricators have commented on a problem of arc blow whilst welding clad pipe. Arc blow is a much more acute problem for welding clad and lined pipe than when welding carbon steel pipe. It is therefore considered to be primarily a problem related to the use of an austenitic (non-magnetic) filler material, in a magnetic steel pipe. As the joint is filled with austenitic material, the lines of magnetic flux have to deflect around the deposited metal, causing distortion to the magnetic field.
The extent to which these problems can arise is dependent upon many parameters:
• The joint design.
• The joint gap.
• The inherent magnetism of the pipe ends and the way they interact when brought together at the joint.
• The selected welding process (some having a stronger or stiffer arc and therefore less susceptible to deflection).
• The welding parameters which influence arc characteristics.
• The type of welding power source.
Notwithstanding this phenomenon, pipelines have been laid without excessive repair rates in most cases. Steps which help are to purchase pipe with residual magnetism below 20 Gauss and also to dynamically remove the magnetic field whilst welding using specialist demagnetizing equipment.
The ultrasonic inspection of clad welds presents a challenge because of the refraction of the beam as it passes from the ferritic backing steel into the austenitic weld metal (in a typical fully-austenitic weld deposit). This results in some error in interpretation of any defect dimensions and location. Confidence in identifying the critical root defects is not as high as in welds with a homogeneous composition. Specialist inspection methods can overcome these problems but it is advised to use the weld qualification trials as an opportunity to calibrate any system for use in the production phase.

四年nice · 发表于 2014-3-25 20:53

阅

尊敬的楼主，您订购的十五字已到账，请注意查收
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少年已经老兰 · 发表于 2014-3-25 21:12

太叼了
——因为有了人海，所以我们的相遇显得那么意外。。

justtoloveyou · 发表于 2014-3-25 22:43

早期的衬里管安装总是要求衬砌rewelded断流器后的管道环缝焊接。最近项目的经验表明,在修复焊缝是由快速重打坡口管结束后(所以没有风险的水分进入gap)可以轻松完成修复环形焊缝没有re-attachment班轮。
在在世界各地的许多项目,制造商有评论电弧偏吹的问题同时焊接复合管。焊接电弧偏吹是一个更严重的问题包层和衬里管比焊接碳钢管。因此被认为是主要问题相关的使用奥氏体(非磁性)填充材料,磁钢管。作为联合充满了奥氏体材料,磁通线必须在熔敷金属转移,导致扭曲的磁场。
这些问题可能出现在多大程度上取决于许多参数:
•联合设计。
•联合差距。
•固有的磁性管结束,他们聚集在一起时共同交互的方式。
•选择的焊接过程(一些强或硬电弧,因此不容易偏转)。
•影响电弧特性的焊接参数。
•焊接电源的类型。
尽管这一现象,管道已经铺设在大多数情况下没有过度的修复率。步骤,帮助购买管残余磁性低于20高斯和动态消除磁场同时使用专业消磁设备焊接。
复合焊接的超声波检查提出了一个挑战,因为折射的光束,从奥氏体焊缝金属的铁素体钢支持(在一个典型的fully-austenitic焊缝存款)。这导致了一些错误的解释任何缺陷尺寸和位置。信心在识别关键的根本缺陷是不一样高焊缝均匀组成。专家检查方法可以克服这些问题,但建议使用焊接资格试验为契机,调整任何系统用于生产阶段。

zhouxuewensl · 发表于 2014-3-26 12:26

我可以说你原文我读不通顺么

求大神帮手翻译一下，我请吃饭！！尽快哦！！

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