The down welding process is applied extensively in long petroleum pipeline construction.
下向焊工艺已经广泛用于长输管道建设工程中。
The project position of welder qualification test for long transporting pipe depends on vertical down welding basically, which is namely fixed pipe with axis horizontal welding (5gx).
长输管道的焊工考试项目位置基本以向下焊为主，即水平固定全位置焊(5gx)。
Welding CCT diagrams of steels are the basic to select welding material, determine the optimum welding technology, relieve welding cracks and lay down standard of past heat treatment.
钢的焊接CCT图，是正确选择焊接材料、确定最佳焊接工艺、消除焊接裂纹、制订焊后热处理规范的重要依据。
Therefore the general construction process scheme is worked out as follows: open trench drainage, work site dried in the sun, conventional butt welding, and pipe laid down into trench.
经过调研和反复现场勘察，确定的总体施工方案为：挖明沟排水，作业带晾晒，正常组对焊接，沉管下沟。
By far, research about laser-arc hybrid welding is mostly concentrated on the application and there is still much problem to solve come down to the arc properties and the stability of welding process.
到目前为止，关于激光-电弧复合热源焊接的研究主要集中在应用方面，而涉及到电弧特性及过程稳定性等基础理论，仍有许多问题亟待解决。
A new welding technique on down-welding has been widely used in welding of long distance pipeline.
下向焊这种焊接新工艺在国内已广泛用于长输管道的焊接。
The edge extension seriously affects the quality of welding. It is now to adopt down hill forming to reduce the edge extension.
边缘延伸严重影响焊接质量，目前可采用下山成型来减小边缘延伸。
To ensure the welding quality of pipe joints this article recommends the welding specifications on pipe's all position with the fiber down-welding electrode and introduces in detail the operation way.
为保证接头的焊接质量，推荐了纤维素型下向焊条管子全位置焊的焊接规范并详细介绍了操作要领。
The welding current, arc voltage, preset current, the period and ratio of pulse, base current, down slope time, gas pre and post flow time are sampled, calculated and controlled by microprocessor.
单片机对焊接电流、电弧电压、电流给定、脉冲周期、占空比、基值电流、收弧电流衰减时间、前气和后气时间等焊接参数进行采样、计算和控制。
The cold cracking sensibility of high tensile pipeline-steel was studied by Ygroove cracking test using seven kinds of high cellulose electrode of vertical down position welding.
采用七种高纤维素型立向下电焊条，通过斜y坡口裂纹实验，对高强管线钢的冷裂敏感性进行实验研究。
Used for down hand welding and flat fillet welding on general low-carbon steel structures…
适用于船体结构低碳钢和其他相应等级的普通低碳钢的平焊、平角焊。
Then a mechanical arm knocks them down to a worker who inspects the welding job.
然后一个机械臂将焊接好的外壳打落在工作台上并由一名工人检查焊点。
The welding residual stress of the welded plate was predicted after it cooled down. The results of prediction and actual measured were contra…
最后，对冷却后的平板残余应力进行了预测，并将有限元计算结果与残余应力的实测结果进行了对比，两者吻合很好。
The welding residual stress of the welded plate was predicted after it cooled down. The results of prediction and actual measured were contra…
最后，对冷却后的平板残余应力进行了预测，并将有限元计算结果与残余应力的实测结果进行了对比，两者吻合很好。
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