1、2023年6月机具设备DOI：10.3969/j.issn.1001-2206.2023.03.015高频电阻焊套管紧密距影响因素研究郭涛，艾裕丰，冯娜，余志，李振英，张娟中国石油集团工程材料研究院有限公司，陕西西安 710077摘要：通过残余应力检测、螺纹参数及尺寸检验、上卸扣试验、拉伸至失效试验、外压挤毁试验和跌落试验，对某套管生产企业生产的紧密距超出标准要求的两个批次的套管螺纹接头进行分析研究。结果表明，试验套管除内螺纹紧密距外，其余试验结果均符合标准要求。直缝焊管管体椭圆度及残余应力控制不如无缝管，加工螺纹后的紧密距和椭圆度的均值都比无缝管大。为避免直缝焊管加工的套管螺纹紧密距和椭圆度
2、超出标准要求，建议生产中优化直缝套管的成形工艺，采取措施减小直缝套管外径椭圆度，降低管内残余应力。关键词：残余应力；紧密距；套管螺纹接头；椭圆度；直缝焊管；无缝管Research on factors affecting stand-off for high frequency resistance weldingcasingGUO Tao,AI Yufeng,FENG Na,YU Zhi,LI Zhenying,ZHANG JuanCNPC Tubular Goods Research Institute,Xian 710077,ChinaAbstract：The two batches o
3、f casing threaded joints produced by a casing production enterprise whose stand-off exceeds the standardrequirements are analyzed and studied through residual stress detection,thread parameters inspection,make-up and break-out test,tensile to failure test,external crushing test,and drop test.The res
4、ults show that the test casing meets the standard requirements exceptthe internal thread stand-off.The control of ovality and residual stress of straight welded pipes is not as good as that of seamless pipes,and the mean values of stand-off and ovality after thread processing are larger than those o
5、f seamless pipes.To avoid the stand-off andovality of the casing thread of straight welded pipes exceeding the standard requirements,it is recommended to optimize the formingprocess of straight welded pipes in production,take measures to reduce the ovality of the outer diameter of the straight welde
6、d pipe andreduce the residual stress in the pipe.Keywords：residual stress;stand-off;casing thread joint;ovality;straight welded pipe;seamless pipe1项目概况某钢管生产企业生产的高频电阻焊套管在产品质量抽检过程中，两个批次套管中各有1根产品外螺纹接头紧密距超出标准要求。现对这两个批次的高频电阻焊套管进行紧密距影响因素研究，分析高频电阻焊套管紧密距超标的可能原因，并提出预防措施。套管试样编号见表1。2试验数据分析2.1残余应力检测对抽检套管试样分别采用环
7、切法和盲孔法进行了 套 管 内 残 余 应 力 检 测1。依 据 ASTM E1928：2013规定的环切法检测套管内残余应力，完成9#、20#无缝套管和 10#、19#高频电阻焊套管的三次残余应力检测，两次检测时间间隔30 d。检测结果见表2，纵向切开后形貌如图1和图2所示。外螺纹试样编号1#2#3#4#5#6#7#8#9#10#TG1TG2、TG3直缝焊管/无缝管无缝直缝直缝直缝直缝直缝直缝直缝无缝直缝无缝直缝内螺纹试样编号11#12#13#14#15#16#17#18#19#20#拧接的外螺纹为直缝焊管/无缝管直缝直缝直缝直缝直缝直缝直缝无缝直缝无缝表1套管试样编号86第49卷第3期机具
8、设备编号9#（无缝套管）20#（无缝套管）19#（直缝套管，沿焊缝切开）10#（直缝套管，距焊缝90切开）残余应力/MPa第1次7.53-1.14-164.95-176.61第2次-0.63-1.64-167.80-170.83第3次7.08-0.34-166.80-182.89平均值/MPa4.66-1.04-166.52-176.78表2环切法残余应力检测结果图1无缝套管纵向切开后形貌图2直缝套管纵向切开后形貌ASTM E1928：2013规定环切法计算公式：S=E1-2t2D1-D0D0D1式中：S为残余应力，MPa；E为弹性模量，MPa，取值206 900 MPa；t为实测平均壁厚，m
9、m；D0为纵向切开前平均外径，mm；D1为纵向切开后平均外径，mm；为泊松比，取值0.3。采用该公式计算残余应力，如果切口变小，结果取“+”号，表示套管内表面残余应力为拉伸应力；切口张大，结果取“-”号，表示套管内表面残余应力为压缩应力。对TG1、TG2和TG3采用盲孔法检测外表面残余应力，检测设备如图3所示，检测位置如图4所示，检测结果见表3。图3盲孔法检测表面残余应力设备图4盲孔法检测位置示意04590135270500 mm300 mm螺纹处方向12 mm12 mmM3 M2 M1LM1 LM22.2螺纹参数及尺寸检验清洗表 1 中的套管试样接头螺纹后，进行螺纹参数及尺寸检验。1#8#外
10、螺纹接头检验结果见表4，11#18#内螺纹接头检验结果见表5。内螺纹表面存在加工毛刺、锈蚀等，外螺纹表面存在机械损伤和锈蚀等，如图 5 所示。表面有损伤或严重锈蚀的螺纹接头未检验螺纹参数，用于残余应力检测。图5螺纹表面毛刺、损伤和锈蚀2.3上/卸扣试验对检验螺纹参数后的套管试样进行上/卸扣试验，试验条件见表6，共进行3次上扣、2次卸扣，试验结果见表7。2.4拉伸至失效试验对上扣后的套管试样进行拉伸至失效的试验，结果见表8，典型拉伸曲线如图6所示。除焊接堵头处断裂外，所有试样的断裂位置均在外螺纹螺纹消失点附近，拉伸失效后试样如图7所示。套管的连接强度均满足标准要求。郭涛等：高频电阻焊套管紧密距影
11、响因素研究872023年6月机具设备编号TG1TG2TG3角度/（）045901351802252703150459013518022527031504590135180225270315应力/MPaM1轴向380.47210.44337.04354.76342.67231.795.36385.06174.34180.18239.99182.89251.78138.83123.31272.23265.53253.46263.69198.3133.73123.87445.71153.74环向135.02133.59223.38216.52160.96111.3423.71136.9120.251
12、32.74131.67124.7194.517.778.5350.37205.73154.49259.32128.2636.387.53133.43115.58M2轴向250.01-50.37233.58230.46155.37149.05455.43242.21256.23154.79216.72150.05229.94188.44162.23228.69188.31242.09230.42221.41369.8280.16245.12298.64环向150.21-56.03150.3648.22132.27103.11260.40128.06202.86135.91152.276.6918
13、2.04140.6791.1767.12115.41172.89210.93220.5117.6376.4778.02122.95M3轴向150.12-56.22150.2448.21132.01103.40260.06128.31191.76190.31295.21212.08229.95148.72253.54325.47170.4340.17254.98298.0407.38353.14189.18379.0环向92.3698.0819.5095.04114.2193.07175.03131.42188.6178.37137.89192.6178.66104.42223.64292.85
14、98.89185.23191.38192.2392.20177.77124.0138.27LM1轴向153.2625.13194.78170.12165.94123.4101.2188.21130.75135.35149.25137.34188.35104.1292.25171.6160.23202.33166.21214.78154.01163.98194.55198.19环向83.3146.73179.58124.1999.2189.1249.83146.51109.0696.4179.6254.4973.7499.1864.0747.6233.0532.45122.34161.66143
15、.2736.8723.68139.07LM2轴向133.19161.12122.1215.44195.06106.36146.91112.07129.38140.2990.71124.69141.53133.64213.05254.58245.48230.13214.87155.84136.98环向79.3993.7580.13180.11106.2981.1783.3278.1684.32132.2484.0673.4484.1633.4738.7665.816.01116.880.5356.0577.15表3盲孔法残余应力检测结果表4螺纹参数及尺寸检验结果（外螺纹接头）试样编号1#2#3#
16、4#5#6#7#8#API Spec 5B：2017要求API Spec 5CT：2018要求紧密距/mm1.162.702.602.482.321.382.422.280.192.73锥度L7（内）/（mmm-1）63.063.062.563.063.063.563.064.061.066.0锥度L7（外）/（mmm-1）63.563.063.062.062.063.064.064.061.067.0螺距偏差/（mm（25.4 mm）-1）00+0.010-0.01-0.0100-0.0100.051牙型高度偏差/mm-0.010-0.010-0.0100-0.010-0.010-0.010-0.0100.025A1/mm122.18122.08122.06122.26122.12122.26122.12122.14122.240.79D/mm275.14274.10274.32274.44275.12274.42275.06274.48271.68275.78顶径/mm0.007-0.038-0.019-0.019-0.0160.0380.0380-0.0510.152椭圆度/mm
