高气压环境脉冲MAG焊气体混合比对焊接稳定性的影响

发布时间：2018-02-28 16:54

本文关键词： 高气压环境脉冲MAG焊气体配比飞溅率熔池形状　出处：《焊接学报》2015年03期 　论文类型：期刊论文

【摘要】：分析了压力环境下气体混合比对脉冲MAG焊飞溅率及焊缝熔池形状的影响.结果表明,压力环境下相同比例的保护气体在流速不变的情况下,起活性作用的气体组分相对较多,电弧弧柱紊乱加剧,飞溅剧烈,焊接过程极不稳定.为获得高气压环境下稳定的焊接过程,减小飞溅率,通过提高混合气体配比中氩气体积分数来降低活性气体造成的能量损失,从而减少飞溅.防止缺陷的产生.综合考虑飞溅率、熔滴过渡稳定性及焊缝熔池形状等因素,在0.3 MPa环境压力下使用90%Ar+10%CO2混合气进行焊接可获得最佳的焊接效果.气体配比的有效调节对于提高高气压环境下脉冲MAG焊焊接过程稳定性和焊接质量具有显著作用.
[Abstract]:The effect of gas mixing ratio on spatter rate and weld pool shape of pulsed MAG welding is analyzed. The results show that the same proportion of protective gas has relatively more active components under the condition of constant velocity of flow under the same pressure environment. In order to obtain the stable welding process under high pressure, the arc arc column is disturbed, spatter is intense, and the welding process is unstable. In order to obtain stable welding process under high pressure, the spatter rate is reduced. The energy loss caused by active gas can be reduced by increasing the volume fraction of argon in the mixture gas ratio, thus reducing the spatter and preventing the occurrence of defects. The factors such as spatter rate, droplet transfer stability and weld pool shape are considered synthetically. The best welding effect can be obtained by using 90 ar 10CO 2 mixture under 0.3 MPa ambient pressure, and the effective adjustment of gas ratio plays an important role in improving the stability and welding quality of pulsed MAG welding under high pressure.
【作者单位】：北京石油化工学院能源工程先进连接技术研究中心;北京化工大学机电工程学院;
【基金】：国家自然科学基金资助项目(51175046);国家自然科学基金青年基金资助项目(51205026)
【分类号】：TG444

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