【摘要】 对三种焊接方式 :手弧焊、CO2 气体保护焊和 Ar气体保护焊的 14Mn Nbq钢焊接头进行了低周疲劳试验 ,表明焊缝金属比母材有较大的强化 .在低应变幅值时 ,CO2 气体保护焊显示出较高寿命 .在高应变幅值时 ,Ar气体保护焊疲劳寿命高一些 .更多还原

【Abstract】 This paper describes the tests for the low cycle fatigue of 14MnNbq steel welded joints in three different ways of welding,i.e.lime ferritic electrode manual metal arc welding,CO 2 arc welding and argon arc welding.Experiments show that weld metals have more hardening than the base material.CO 2 arc weld metal has a little longer fatigue life in low strain ranges.The argon arc weld metal has a little longer fatigue life in high strain ranges更多还原