The stirrer with bigger shoulder contributes to the transformation of plasticity in the direction of weld thickness, it is easier for onion rings to expand in the weld thickness direction.

轴肩较大的搅拌头有利于塑性金属在焊缝厚度方向上的迁移，洋葱环更易于在厚度方向上扩张。

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The stirrer with bigger shoulder contributes to the transformation of plasticity in the direction of weld thickness, it is easier for onion rings to expand in the weld thickness direction.

轴肩较大的搅拌头有利于塑性金属在焊缝厚度方向上的迁移，洋葱环更易于在厚度方向上扩张。

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