以10 mm厚聚丙烯（PP）塑料为研究对象，采用搅拌摩擦焊技术对其进行连接，探索加工参数对PP塑料宏观形貌及力学性能的影响。结果表明：当旋转速度为600~1 000 r/mim、前进速度为70 mm/min、下压量为0.1 mm时焊接成型，表面无明显缺陷。随着旋转速度的增加，抗拉强度先显著上升，在800 r/mim时达到最高的22.05 MPa，为母材的71%，随后下降。母材拉伸试样为韧性断裂，伴有细颈产生，并伴随着局部晶粒的纤维化；而连接试样为脆性断裂。随着旋转速度的增加，平均摩擦系数先缓慢下降，然后显著下降。在旋转速度为800 r/mim时，平均摩擦系数达到最小的0.338，随后显著上升。母材及连接试样表面的磨损形式主要为塑变磨损。

Taking 10 mm thick polypropylene (PP) plastic as the research subject, friction stir welding technology was used to connect it, and the influence of processing parameters on the macro morphology and mechanical properties of PP plastic was explored. The results showed that when the rotation speed was 600~1 000 r/mim, the forward speed was 70 mm/min, and the pressure was 0.1 mm, there was no obvious defect on the welded forming surface. With the increase of rotation speed, the tensile strength initially increased significantly, reaching a maximum of 22.05 MPa at 800 r/mim, which was 71% of the base material, and then decreased. The base material tensile specimen exhibited ductile fracture, accompanied by the formation of a fine neck and localized grain fibrillation, whereas the connected specimen showed brittle fracture. With the increase of rotation speed, the average friction coefficient decreased slowly at first and then significantly. At the rotation speed of 800 r/mim, the average friction coefficient reached the minimum of 0.338 and then increasesd significantly. The wear form of the base material and the connected specimen surface was mainly plastic wear.