采用AC-GTAW工艺进行Al-6.3Cu铝合金电弧填丝单道多层成形试验,针对不同热输入、空气和氩气两种环境及不同送丝速度条件,研究过程参数及环境气氛对成形件内部气孔的影响.结果表明,热输入对气孔的影响最大,控制热输入能减少试件中气孔数量和大小;在适当控制热输入条件下,采用氩气环境和低送丝速度可显著减少内部气孔缺陷.试验发现,I=125A,υTS=0.30 m/min,氩气环境下,υWFS=2.0 m/min时,气孔数量最少,尺寸最小.
Al-6.3Cu alloy straight wall samples were produced using AC-GTAW process.The influence of heat input,environmental atmosphere,and wire feed speed on porosity characteristics of deposition samples were investigated.Results show that heat input is the most important factor affecting the porosity defect.Gas pore counts and their diameter can be reduced with proper heat input.With lower heat input,the gas pores can be further reduced in argon environment and at lower wire feed speed.The experimental results demonstrate that in argon environment,at travel speed of 0.30 m/min and wire feed speed of 2.0 rn/min,the gas pores can be controlled effectively.
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