Proposed distinction formula is brought out for the burning through in-service welding. It can instruct in-service welding and welding procedure in service welding construction.
给出了在役焊接是否发穿的判别公式，从而指导现场在役焊接，以及在役焊接施工工艺的制定。
Because of the fast cooling of flowing medium, the hydrogen cracking occurs easily under in-service welding.
在役焊接过程中，管内流动介质的快速冷却，易使接头出现氢致裂纹。
Stress concentration zones caused by welding cracks are the most dangerous weak-links in service processes of welding works, so an effective safety evaluation of the links is of great importance.
焊接裂纹产生的应力集中区是焊接构件在服役过程中最为危险的一个薄弱环节，对这个环节进行有效的安全评估，具有重要意义。
In service pipeline non-stop transmission welding is a method to maintenance and rebuild pipeline under welding pipe of certain transmission amount, flow speed, pressure status.
在役管道不停输焊接是在一定的输量、流速、压力的状态下焊接管件，对管道进行维修、改造的一种方法。
Results show that distribution regularity of residual stress of in-service keeps coherent with routine welding, which measures up deformation mechanism of welding, but numeric value is different.
结果表明：在役焊接接头残余应力分布规律与常规焊接保持一致，符合管道焊接接头“内凸外凹”的变形机理，但在数值上差别较大。
On he base of analyzing the characteristic of oil & gas pipelines and present status of repairing by welding of our country, the key problem of developing in-service repairing by welding in our count.
综述了高压运行油气管线在役焊接修复的意义、分类、工艺特点和存在的主要问题，总结分析了最近几年国外在在役焊接烧穿和最小线能量方面的最新研究成果。
Basing on SYSWELD software, stress of in-service welding joint of X70 pipeline steel has been simulated, and residual stress of in-service was compared with routine welding.
采用SYSWELD焊接模拟软件对X70级管道在役焊接接头应力进行模拟，并将在役焊接残余应力与常规焊接进行对比。
Utilizing the transformation of bead metal can reduce tensile stress directly in the course of welding, even produces compressive stress, to improve the service life of welding structure effectively.
利用焊缝金属组织转变的方法可以在焊接过程中直接降低焊接残余拉伸应力，甚至产生残余压缩应力，有效地提高焊接结构的使用寿命。
Residual stress of longitudinal submerged arc welded pipe after welding is the major reason caused welded pipe stress corrosion crack, its stress level directly decide pipeline safety in service.
直缝埋弧焊管焊后残余应力是导致焊管应力腐蚀裂纹产生的主要原因。
Temperature field and residual stress field of orthogonal structure under normal welding and in-service welding condition were simulated by FEM.
运用有限元方法对正交接管结构在常规焊接和在线焊接条件下的温度场和残余应力场进行了数值模拟。
Welding repair onto in-service pressure pipelines has good economic efficiency and application trend, because it is much quick and has little effect to normal run of pipeline.
压力管道在役焊接修复时间短，速度快，对管道正常运行影响小，有巨大的经济效益和广阔的应用前景。
The simulation of plate test not only proved the reliability of SYSWELD on in-service welding simulation, but also showed the procedure of application of this software.
通过对平板试验的模拟，不仅验证了SYSWELD软件在焊接仿真上的可靠性，同时也为该软件的具体操作流程做了介绍。
The numerical simulated and experimental results accord with each other. It can be concluded that the temperature field of in-service welding can be simulated accurately by FEM.
温度场的模拟结果与试验结果吻合较好，采用数值模拟方法可以对在线焊接时的温度场进行较准确的模拟。
On he base of analyzing the characteristic of oil & gas pipelines and present status of repairing by welding of our country, the key problem of developing in-service repairing by welding in our count…
在分析了我国油气管线的特点和焊接修复技术现状的基础上，提出了在我国开展在役焊接修复研究应注意的问题。
Is the pharmaceutical filling sealing and cutting welding field research and development of plastic products design, production, sales and service in a body's enterprise.
精雕机等三轴四轴领域集研发设计、生产制造、销售服务于一体的企业。
Full welding of the ball valve body can be directly buried in the ground, so that in case the valve from erosion, the maximum service life of up to 30 years, oil, natural gas pipeline valve ideal.
全焊接阀体的球阀，可以直埋于地下，使阀门内件不受侵蚀，最高使用寿命可达30年，是石油、天然气管线最理想的阀门。
A study was carried out on the microstructure of interface and welding seam in dual-metal clad steel pipe. And its inferences on technological and service properties were studied.
通过金相分析、微区成份分析、宏观和微观断口分析，主要研究钎焊层和焊鏠区的微观结构及其对复合钢管工艺性能和使用性能的影响。
A study was carried out on the microstructure of interface and welding seam in dual-metal clad steel pipe. And its inferences on technological and service properties were studied.
通过金相分析、微区成份分析、宏观和微观断口分析，主要研究钎焊层和焊鏠区的微观结构及其对复合钢管工艺性能和使用性能的影响。
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