溶接構造用 Al-Zn-Mg 系合金の研究(第 4 報) : 溶接性および溶接部の諸性能におよぼす溶加材の影響

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A study was made of the effects of filler metals on the weldability of Al-Zn-Mg alloys. Aging characteristics, mechanical properties, stress-corrosion cracking susceptibility of welds and weld cracking susceptibility were examined by means of Vickers-hardness, tensile, bending, Charpy impact, stresscorrosion cracking, weld cracking and other tests. The results obtained are summarized as follows. (1) Tensile strength of welds made with Al-Mg-Zn filler metal was almost equal to that of Al-Zn-Mg filler metal and that of Al-Mg filler metal showed the lowest value, while the age hardening of welds increased in the following order; Al-Mg filler<Al-Mg-Zn filler<Al-Zn-Mg filler. (2) However, bending and Charpy impact properties of welds made with Al-Mg filler metal were most excellent, and those of Al-Zn-Mg filler metal were inferior to those of Al-Mg and Al-Mg-Zn filler metals. (3) No appreciable difference in stress-corrosion cracking susceptibility and fatigue properties was observed in Al-Zn-Mg, Al-Mg-Zn and Al-Mg filler metals. (4) Weld cracking susceptibility increased in the following order; Al-Mg filler<Al-Mg-Zn filler<Al-Zn-Mg filler. However, weld cracking susceptibility of Al-Mg-Zn filler metal containing a small amount of zirconium was almost equal to that of Al-Mg filler metal.
1969-01-25