In this study, two different polymer materials were used. In the joints made with friction stir spot welding, firstly (PP/PP and HDPE/HDPE) and then different materials (PP/HDPE, HDPE/PP) joining processes were carried. The influence of the tool rotational speed and the stirring time on joint formation and weld strength were determined. The temperature of the liquid welding materials varies according to the materials to be combined. High weld strengths were obtained at the friction stir spot welding of similar plastic sheets. The highest weld strengths were obtained in PP-PP welds. Low weld strengths were obtained at the friction stir spot welding of dissimilar plastic sheets because of immiscible and incompatible blends formed during the welding operation. The lowest weld strengths were obtained in PP-HDPE welds. The chemical composition and the phase morphology of the blends, the mechanical scission occurrence and the welding residual stresses determine the strength of the welds.

在这项研究中，使用了两种不同的聚合物材料。在通过搅拌摩擦点焊制成的接头中，首先进行PP / PP和HDPE / HDPE，然后进行不同材料的连接（PP / HDPE，HDPE / PP）。确定了工具转速和搅拌时间对接头形成和焊接强度的影响。液态焊接材料的温度根据要结合的材料而变化。在类似塑料片材的搅拌摩擦点焊中获得了很高的焊接强度。在PP-PP焊缝中获得了最高的焊接强度。在异种塑料板的摩擦搅拌点焊中，由于焊接过程中形成的不相容和不相容的混合物，焊接强度较低。在PP-HDPE焊缝中获得最低的焊接强度。