【摘要】 对铝合金９１９焊接接头的强度和硬度进行了分析讨论。结果表明，在焊接热循环作用下，强化相在晶界析出并聚集长大，导致了接头的强度和硬度下降，焊接热影响区产生了软化。更多还原

【Abstract】 The tensile strength and hardness of the welded joint on aluminium alloy 919 were discussed in this paper.The results show that the tensile strength and hardness of welded joint are decreased,softening occurs at HAZ,because the strengthening phase separates out at crystal boundary and grows up concentratively更多还原