以?23 mm ×0．7 mm的TA2纯钛焊接管为原料，研究了不同冷轧加工率对管材焊缝组织的影响，优选出冷加工率达到34%焊接管材，进行了后序的除油酸洗和真空退火处理。对比分析了经冷轧→除油酸洗→真空炉退火处理的焊接管与冷轧无缝管力学性能及工艺性能的差异。结果表明， TA2纯钛焊接管经过无缝化工艺处理后，焊缝粗大的铸态组织和过热的魏氏组织完全消除，为细小、均匀的等轴组织，与基体组织趋于一致；与冷轧无缝管相比，其抗拉强度、屈服强度、延伸率略高或相当；反向展平、扩口、压扁等工艺性能也无明显差异，有望取代冷轧无缝管。
The effects of cold rolling process on microstructure of welded joint were studied, taking?23 mm × 0. 7 mm TA2 pure titanium welded tube as experimental material. The optimal cold working rate was 34%, and the subsequent pickling and vacuum annealing treatment were carried out. The mechanical properties and process performance of cold-rolled seamless tube and welded tube after seamless processing were compared. The results show that, the coarse cast structure and Widmanstatten structure are completely eliminated, while fine and uniform equiaxed grain consistent with matrix structure can be obtained. The tensile strength, yield strength and elongation are slightly higher or equiva-lent compared with cold-rolled seamless tubes, and no obvious difference are found on reverse flattening, flaring and flattening performance. TA2 welded tube after seamless processing is expected to replace cold-rolled seamless tube.
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