The influence of different heat treatment methods on the mechanical properties of Ti52 alloy drill pipe weld were studied.The results showed that after annealing at 900℃for 10 minutes,the tensile strength of the weld decreased,the yield strength increased,the elongation decreased,the section shrinkage increased,and the hardness increased greatly,however,the impact energy at room temperature was only 67.4%of the base metal,and the impact energy at-40℃was only 67.7%of the impact energy at room temperature;After solid strengthening and water cool-ing at 900℃for 10 minutes,then aging and air cooling at 680℃for 10 minutes,the tensile strength,yield strength and elongation were all decreased slightly,the section shrinkage increased,the hardness decreased slightly,and the impact energy of the weld at room temperature reached 84.8%of the base metal,the impact energy at-40℃was 84.6%of that at room temperature,which showed good usability performance under extremely bad conditions.
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