摘要
采用小孔检测法研究了在ERW电阻焊管直焊缝位置热切割直径为Φ26 mm和Φ50 mm的小孔,在焊缝附近位置开Φ26 mm小孔后管道上残余应力的分布情况。试验结果表明:对比ERW电阻焊管原始残余应力分布曲线可知,热开孔后,开孔边缘应力急剧上升,出现应力集中区域。研究的三种情况下,在焊缝附近区域开孔对焊管原始残余应力幅值影响最大,轴向和环向残余应力最大值分别约为母材的66%和72%。在直焊缝位置开Φ50 mm孔应力集中区域最宽,最大距离距开孔中心约76 mm。
The residual stress distributions on the electric resistance weld pipe after heat drilling holes were studied through hole-drilling technique,which include one Φ26mm hole and one Φ50mm hole at the weld center,and one Φ26mm hole adjacent to the weld center. The results illustrated that as compared to the original residual stresses on ERW pipe,the residual stresses at the holes edge after heat drilling hole increased sharply and formed stress concentration areas. Heat drilling hole of Φ26mm tangent to weld center had great influence on the amplitude of residual stresses. And the diameter of heat drilling hole also had great influence on the stress concentration area. The max axial and circumferential stress values were about 66% and 72% of base metal yield strength respectively. The distance was about 76 mm away from the weld center under the case of heat drilling hole of Φ50mm at weld center.
出处
《石油管材与仪器》
2016年第3期49-52,共4页
Petroleum Tubular Goods & Instruments
关键词
ERW电阻焊管
热开孔
小孔检测法
残余应力
electric resistance weld pipe
heat drilling hole
hole-drilling technique
residual stress
