CMT工艺对Al-Cu合金电弧增材制造气孔的影响

Influence of CMT Process on Porosity of Wire Arc Additive Manufactured Al-Cu Alloy

摘要:

分析不同纯氩保护气体流量和冷金属过渡(CMT)工艺方法对Al-Cu合金电弧填丝增材制造(WAAM)气孔的影响规律。结果表明：纯氩保护气体流量和CMT工艺方法对Al-Cu合金WAAM制造过程的气孔特征均具有重要影响。提高纯氩保护气体流量有助于减少气孔；CMT-PADV工艺因其热输入低及电弧对Al-Cu合金填充丝端部表面氧化膜的高效清理而有利于减少甚至消除气孔，提高纯氩保护气体流量至25 L/min时可消除气孔。

Abstract:

Porosity characteristics of wire arc additive manufactured (WAAM) Al-Cu alloy using different pure argon flow rates and CMT process were investigated. It is observed that the porosity of aluminium alloy deposition can be significantly influenced by pure argon flow rate and CMT process. It is beneficial to reduce the porosity with the increase of pure argon flow rate. CMT-PADV is the most applicable process for aluminium alloy WAAM process. The porosity reduction using CMT-PADV process is due to its low heat input and effective oxide cleanliness of aluminium alloy filler wire. With a proper shielding flow rate of 25 L/min, CMT-PADV process can produce aluminium alloy demonstration with no porosity.