采用国产6005 A铝合金进行焊接试验，并对焊接接头进行了力学性能检测及金相显微组织观察。
Welding test of extruded 6005a Aluminium alloy was performed and mechanical properties and optical Ancrostructures were studied.
金相显微组织分析表明，不同磁场退火处理后试样晶粒平均大小变化不大，而晶粒间不均匀程度增加。
Optical microstructure pictures show that the magnetic field have few effects on the mean grain sizes of samples through magnetic annealing, and the grain sizes vary drastically.
通过对弯曲件冷冲模各加工工艺和金相显微组织的分析，分析了冷冲模产生裂纹的原因，并提出了防止裂纹产生的工艺措施。
The causes of crack for cold-working die are analyzed by checking machining technique and observing the microscopic structure, the technical measures to prevent cracks are put forwarded in the paper.
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