铝对自保护药芯焊丝性能的影响

Effect of Aluminium on Properties of Self-shielded Flux-cored Wire

关键词:  自保护药芯焊丝  铝  气孔敏感性  性能

Key words:  self-shielded flux-cored wire  aluminium  pore sensitivity  property

摘要:

通过自保护药芯焊丝药芯配方中铝粉加入量的变化、以及采用含铝和不含铝两种钢带作为焊丝外皮的变化,深入地研究了铝对焊缝气孔敏感性、熔敷金属力学性能、金相组织、夹杂物种类及形态的影响。研究结果表明,随焊丝药芯配方中铝粉的增加,熔敷金属中铝含量增加、氧含量下降、氮含量明显下降,焊缝气孔敏感性大大降低,但熔敷金属显微组织恶化,夹杂物数量增多,熔敷金属的韧性明显下降;采用含铝钢带制造自保护药芯焊丝能充分发挥铝的有利作用,同时减少熔敷金属中残留铝含量及对性能的不利影响。

Abstract:

The effect of aluminium on the pore sensitivity,microstructure,mechanical properties and inclusion of the deposited metal were studied by changing the amount of aluminium powder in the flux core and the aluminium content in the steel sheath of the self-shielded flux-cored wire.The results show that with the increasing amount of the aluminium powder in the flux core of the wire,the content of oxygen and nitrogen in deposited metal and pore sensitivity of weld reduce obviously,but the content of aluminium and amount of inclusion in the deposited metal increase,and the microstructre of deposited metal is deteriorated seriously,the toughness of the deposited metal goes down.When using the aluminium contained steel sheath,the harmf of aluminum to the properties of deposited metal can be limited to some extent.