Study on Microstructures and Mechanical Properties of TA23 Alloy Welded Joints by Different Welding Processes
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摘要: 采用CMT、TIG和EBW焊对TA23合金进行焊接, 对比分析了不同焊接方法下接头微观组织和力学性能的差异。结果表明, 焊接热输入直接影响焊缝晶粒尺寸和焊接接头宽度, TIG焊缝晶粒尺寸最大, CMT次之, EBW最小;EBW接头宽度为5 mm, CMT接头宽度为7 mm, TIG接头达14 mm;3种焊接方法焊缝区域组织均由马氏体α相、片层状α相和残余β相组成, 热影响区组织形态介于焊缝和母材组织形态之间;3种焊接方法焊缝区显微硬度和接头抗拉强度均大于母材, 其中EBW焊缝区显微硬度值最大, TIG焊接头抗拉强度最高, CMT焊缝显微硬度和接头抗拉强度均居中。Abstract: TA23 alloy sheets were welded by CMT, TIG and EBW, and the study on the microstructures and mechanical properties of the welded joints were carried out. The results showed that the welding heat input directly influenced the size of grain and the width of the joints; The size of grain by TIG process was the largest, followed by that by CMT, while the size of grain by EBW was the smallest; The width of the joint by EBW was 5 mm, the width by CMT 7 mm, and the width by TIG 14 mm; Microstructures of welded seams created by the three welding processes mainly consisted of martensite α, lamellar α and residual β phases, while the microstructures of HAZ was between those of welded seams and base metal; The micro-hardnesses and tensile strengths of the welded seams from the three processes were higher than those of the base metal, of which the micro-hardness of the EBW joint was the highest and the tensile strength of TIG was the highest, while the properties of CMT joint are between those of TIG and EBW.
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Key words:
- TA23 alloy /
- welding technology /
- microstructure /
- mechanical properties
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