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1.前言众所周知,在我国作为焊接结构用的铝合金,主要为非热处理强化的合金,其中Al-Mg 系合金应用得较多。近年来,也在陆续应用可热处理强化的 Al-Zn-Mg 系合金。这是因为这些合金均具有优良的可焊性和抗蚀性能,同时 Al-Mg 系合金在退火状态下,还具有较高的强度,Al-Zn-Mg 系合金的焊接接头由于焊后自然时效,强度几乎能回复到与基体强度相等的程度,从而结构件在焊接状态就可以得到必要的强度。可热处理强化的 Al-Cu 系合金,在铝合金中属于高强合金。因此,在要求高强度
1. Preface As we all know, in our country as a welded aluminum alloy structure, mainly non-heat strengthened alloy, Al-Mg alloy which is used more. In recent years, the Al-Zn-Mg alloy that can be heat-treated and strengthened has also been applied one after another. This is because these alloys have excellent solderability and corrosion resistance, while Al-Mg-based alloys in the annealed state, but also have high strength, Al-Zn-Mg alloy welded joints due to natural aging after welding , The strength can almost be restored to the same degree with the strength of the base, so that the structure in the welding state can get the necessary strength. Al-Cu alloys that can be heat-treated and strengthened are all high-strength alloys in aluminum alloys. Therefore, high strength is required