Influence of several times welding reworking on aluminum alloy welding joints for high speed train

One time, second time and third time welding reworking test were employed to test the EN 5083 welding joints.The morphology, hardness, tensile strength, impact toughness, cutting strength and push rate were analyzed.The results showed that the grains of the reworking layers were larger than the original welding layers.The α(Al)+β(Mg2Al3)net like morphology were much larger.The second phase after heated of the fusion area was much more than the original welding layers.The hardness, tensile strength, impact toughness were the same as the original welding layers.The cutting tongue of fracture was obviously which manifested the fracture mechanism was toughness.The cutting strength of the weld was lower but distributed stable.The cutting strength of different layers was the same as original which manifested the properties of the welding reworking layers were well.So the third reworking may be possible.