焊接热循环对连续油管焊接HAZ组织的影响
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摘要
为了探究不同焊接热循环条件对连续油管焊接HAZ组织的影响规律,采用热模拟技术、电子背散射衍射(EBSD)、 X射线衍射(XRD)等显微分析方法和硬度测试等手段,对不同峰值温度和冷却时间下的焊接HAZ组织影响规律进行了分析。结果表明,随着峰值温度的增加,管材硬度值变化呈先下降后上升趋势,且在800℃时软化最为严重;当峰值温度达到950℃和1 300℃时,组织晶粒的粗化随冷却时间延长更为明显,硬度值也逐渐增大;焊接作业时可以采用低能量焊接和加铜块水冷的方法来减弱焊接热循环对焊接接头的影响。
In order to explore the influence of different conditions of welding thermal cycling on the HAZ structure of coiled tubing welding,thermal simulation techniques,electron backscatter diffraction(EBSD), X-ray diffraction (XRD) and other microscopic analysis methods and hardness tests were used to analyze influence rule of weld HAZ structure under different peaks of temperature and cooling time. The results show that with the increase of peak temperature, the hardness of the pipe first decreases and then rises,and the softening is most serious at 800 ℃. When the peak temperature reaches 950 ℃ and 1 300 ℃, the phase transformation coarsening of the microstructure is more obvious with the cooling time, and the hardness is gradually rising. Low energy welding and copper block water cooling can be used to reduce the influence of welding heat cycle on the welded joint.
In order to explore the influence of different conditions of welding thermal cycling on the HAZ structure of coiled tubing welding,thermal simulation techniques,electron backscatter diffraction(EBSD), X-ray diffraction (XRD) and other microscopic analysis methods and hardness tests were used to analyze influence rule of weld HAZ structure under different peaks of temperature and cooling time. The results show that with the increase of peak temperature, the hardness of the pipe first decreases and then rises,and the softening is most serious at 800 ℃. When the peak temperature reaches 950 ℃ and 1 300 ℃, the phase transformation coarsening of the microstructure is more obvious with the cooling time, and the hardness is gradually rising. Low energy welding and copper block water cooling can be used to reduce the influence of welding heat cycle on the welded joint.
引文
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[2]邹先雄,卢秀德,黎宗琪,等.国产连续管设备在川渝油气田的推广应用与展望[J].石油科技论坛,2017(5):44-48,67.
[3]胡强法,付悦,盖志亮,等.连续管作业技术与装备研发及应用推广[J].石油科技论坛,2017(5):7-11.
[4]鲁明春,张久文,姜方林,等.CT80国产连续油管在复杂油气田环境中的规模应用[J].焊管,2012,35(9):47-50.
[5]唐大丰,周金卫,杨文海.国产CT80连续管在吐哈油田的应用[J].石油机械,2011,39(s1):77-78.
[6]李霄,石凯,王洪铎,等.CT80连续油管TIG焊对接接头热循环过程研究[J].热加工工艺,2011,40(9):168-170.
[7]LI X,SHI K,PENG T,et al.Welding thermo cycle and HAZ softening of CT80 butt weld joint[J].Advanced Materials Research,2011(295-297):1901-1904.
[8]PANTLEON W.Resolving the geometrically necessary dislocation content by conventional electron backscattering diffraction[J].Scripta Materialia,2008,58(11):994-997.
[9]PANTLEON W.Retrieving orientation correlations in deformation structures from orientation maps[J].Metal Science Journal,2013,21(12):1392-1396.
[10]HE W,MA W,PANTLEON W.Microstructure of individual grains in cold-rolled aluminium from orientation inhomogeneities resolved by electron backscattering diffraction[J].Materials Science&Engineering A,2008,494(1-2):21-27.