Residual welding stresses in the pipe-bar joints of a rotary drilling rig

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Abstract

The drill rod is one of the most important components of a rotary drilling rig and it is highly stressed. The pipe-bar welded joints are most likely to be damaged. The welding of pipe-bar joints is simulated using the SYSWELD software to calculate the residual welding stresses for comparison with measured residual welding stresses by X-ray diffraction. The calculated results are in good agreement with the measured data. The welding speed is then changed to study its effect on the residual welding stresses. The results show that the maximum tensile stress exists at the heat affected zone. With the increase of welding speed, the maximum tangential compressive stress increases, but the maximum tensile stress has no significant change.

Keywords residual stress rotary drilling rig pipe-bar joint finite element simulation

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Issue Date: 15 February 2014

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	Haiyan ZHAO
	Xingquan XU
	Xingzhe YU
	Xiaowu ZHU

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Haiyan ZHAO,Xingquan XU,Xingzhe YU, et al. Residual welding stresses in the pipe-bar joints of a rotary drilling rig[J]. Journal of Tsinghua University(Science and Technology), 2014, 54(2): 191-196.

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http://jst.tsinghuajournals.com/EN/ OR http://jst.tsinghuajournals.com/EN/Y2014/V54/I2/191

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