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材料工程  2014 

石墨对无渣自保护药芯焊丝性能的影响

DOI: 10.11868/j.issn.1001-4381.2014.07.006, PP. 28-33

Keywords: 石墨,自保护药芯焊丝,无渣,堆焊,熔滴过渡

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Abstract:

基于Fe-Cr-C堆焊合金体系,研究了石墨含量对无渣自保护药芯焊丝熔滴过渡行为、焊接飞溅、焊缝成形,以及堆焊层组织和性能的影响。实验结果表明,石墨含量在0%~8%(质量分数,下同)范围内变化时,随着石墨含量的增加,熔滴细化、过渡频率逐渐增大;焊接飞溅呈现先减小后增大的趋势,当石墨含量为6%时,飞溅率出现最小值3.57%,此时亦获得良好的自保护效果,焊道成型美观,表面光洁无渣。石墨促进了堆焊层组织先析碳化物的形成,同时抑制了共晶碳化物的生长,并使得先析碳化物趋于垂直于母材表面生长。随着石墨含量的增加;洛氏硬度值逐渐增加;当石墨含量超过6%后,硬度值增幅放缓,韧性恶化,焊道出现裂纹。综合考虑上述因素,该无渣自保护药芯焊丝药芯中石墨最佳添加量为6%左右。

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