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对2024铝合金板进行不同参数下搅拌摩擦焊接,分析了焊缝表面组织.检查了在EXCO溶液中焊缝表面的腐蚀行为,并讨论硬度分布与腐蚀发生的关系.结果表明,焊后轴肩作用区晶粒细化明显.随转速的增加,焊缝上表面热影响区范围加宽、轴肩作用区硬度上升、耐蚀性能提高.在转速1500 r/min、行进速度1000mm/min下所得焊缝金属塑性流动剧烈.轴肩作用区硬度值已接近母材的硬度值,在EXCO溶液中浸泡10 h后仅发生点蚀.与母材相比,接头硬度的软化区是腐蚀发生的区域,但硬度值最低的位置与腐蚀最严重的区域没有严格的对应关系.
The friction stir welding of 2024 aluminum alloy plate under different parameters was carried out to analyze the surface structure of the weld.The corrosion behavior of the weld surface in EXCO solution was examined and the relationship between the hardness distribution and the corrosion was discussed.The results show that the weld shoulder With the increase of rotational speed, the range of heat affected zone (HAZ) on the upper surface of weld bead widened, and the hardness of the area on the shoulder and shoulder increased, and the corrosion resistance was improved.When the rotating speed was 1500 r / min and the traveling speed was 1000 mm / min The plasticity of weld metal is violent and the hardness value of the action zone of the shoulder is close to the hardness value of the base material, pitting only occurs after soaking in EXCO solution for 10 h. Compared with the base metal, the softening zone of joint hardness is the area where corrosion occurs However, there is no strict correspondence between the lowest hardness value and the most corroded area.