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Reducing Intermetallic Compounds of Mg/Al Joint in Friction Stir Lap Welding

机译:减少摩擦搅拌圈焊接中Mg / Al关节的金属间化合物

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To reduce intermetallic compounds (IMCs) of Al12Mg17 and Al3Mg2 in Mg/Al friction stir lap welding joint, pin tip was plunged into the lower sheet at a small distance. Results showed that at a fixed welding speed of 50mm/min, sound joints were obtained using rotating speeds from 750 to 500rpm, and the IMCs zones were rather small. Cracks easily appeared inside IMCs inside onion ring and at lap interface. Therefore, reducing the IMC was beneficial for reducing the crack. Joint lap shear stress firstly increased and then decreased with decrease in the rotating speed. The maximum shear stress of 50.2MPa was attained at a rotating speed of 500rpm because of reduced IMC.
机译:为了将Al12mg17和Al3mg2的金属间化合物(IMC)减少Mg / Al摩擦搅拌圈焊接接头中,将销尖端延伸到较小距离的下片中。 结果表明,在固定焊接速度为50mm / min,使用750至500rpm的旋转速度获得声音接头,并且IMCS区域相当小。 裂缝很容易出现在洋葱环内部和搭接界面内的IMC中。 因此,减少IMC有利于降低裂缝。 关节圈剪切应力首先增加,然后随着旋转速度的降低而降低。 由于IMC减少,以500rpm的旋转速度达到50.2MPa的最大剪切应力。

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