管道冷裂纹试验方法—TRC试验研究

通过对TRC(tensile restraint cracking)试验进行探索，对利用这种简便、实用、经济的小型试验方法研究管道环焊缝冷裂纹敏感性及指导生产中的成功应用将起到重要作用。试样采用管径325 mm的管圈进行有限元计算拘束度值，发现焊缝各点的拘束度分布较为均匀，虽然拘束的大小上下有波动，大约在3点钟方向和9点钟方向稍有偏差，与实际管道拘束度相差不多。为验证模拟计算的拘束度的可靠性，进行实际焊接试验，焊后测量值与模拟值在可控范围内，无裂纹，该试验可以应用于管道生产中。

Experimental Exploration on TRC-a Test Method of Cold Crack in Pipes

This paper carried out exploration on the TRC test(tensile restraint cracking test). And the exploration results will play an important role in utilizing this simple, practical, economic and small-scale test method to study the susceptibility of circumferential weld cold cracking of pipes and guiding its successful applications in production. Tube coil with a diameter of 325 mm was adopted in the calculation. Restraint intensity values of the tube were obtained using finite element calculation method. It is found that the distribution of restraint intensity values along the weld joint is even. Although calculated restraint intensity values fluctuate in amplitude and there is slight deviation at three o，clock and nine o，clock directions, they are almost the same as actual values of pipes. In order to verify the reliability of the simulated restraint intensity, actual welding actions were carried out. The measured values and simulation values after welding are in a controllable range and there is no crack. Therefore, the test can be applied in the pipeline production.