扁平钢带错绕式压力容器钢带两端焊接残余应力的研究

Experimental Research on Welding Residual Stress on the Ends of the Steel Ribbon of Flat Steel Ribbon Wound Pressure Vessel

扁平钢带错绕式压力容器已成功应用于80 MPa级高压储氢容器,同时更高压力的储氢容器正在研制之中。随着该类容器工作压力的不断提高,以及在储氢苛刻条件下的应用,绕带层两端的焊接缺陷(残余应力)已经成为影响容器整体性能的不可预测的因素。对一工作压力为98 MPa的储氢容器研究了其钢带两端焊缝处的残余应力。盲孔法测量数据表明,各钢带两端焊接处应力差异很大,部分应力较大的地方在残余应力的影响下极易产生疲劳裂纹,甚至局部屈服。

The flat steel ribbon wound pressure vessel are successfully used for the 80 MPa hydrogen storage, while the hydrogen storage vessels with higher pressure are being researched. As the pressure of the hydrogen storage increases along with the rigorous hydrogen storage conditions, the influence of welding residual stress on the ends of the steel ribbon of the fiat steel ribbon wound pressure vessel becomes unpredictable. In this article, the welding residual stress on the ends of the steel ribbon of a 98 MPa flat steel ribbon wound pressure vessel is firstly measured by using the hole-drilling method. It can be seen from the test data that the welding stresses on both ends of each steel ribbon-are of great different. Meanwhile the endurance cracks, even local yielding, are easily produced in weld joints with large residual stresses.