AMг6HH合金是热处理强化型或冷作硬化型高强可焊铝合金中对热作用最敏感的一种合金。上述状态的合金,即使在焊接过程中经短时间加热,也会导致强度指标有某些降低和热影响区中的基体金属发生软化。在熔化焊的各种方法中,电子束焊由于能量高度集中、焊接熔池体积小和焊接速度快,因而对热影响区中基体金属的软化影响也最 AM66HH alloy is a kind of alloy which is the most sensitive to heat in the heat treatment strengthened or cold work hardened high strength weldable aluminum alloy. Alloys in the above state, even if heated for a short time during the welding process, also cause some reduction in the strength index and softening of the base metal in the heat affected zone. In the various methods of fusion welding, electron beam welding due to the high concentration of energy, small welding pool volume and welding speed, so the heat affected zone in the softening of the matrix metal is also the most