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熔滴过渡对脉冲熔化极氩弧焊快速成形的影响 被引量:15

Effect of Droplet Transition on Rapid Prototyping by P-MIG
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摘要 为提高成形的精度和性能,采用机器人焊接系统和高速摄像系统,研究了铝合金双阶梯脉冲熔化极氩弧焊(Pulsedgasmetal arc welding,P-MIG)快速成形中熔滴过渡行为对多道多层成形的影响。试验中,通过调节脉冲频率和脉冲时间等脉冲工艺参数来获得不同的熔滴过渡速率、熔滴大小及熔滴过渡形式,研究其对多道多层成形的表面形貌(包括表面尺寸、正面形貌和侧面形貌)、微观组织和硬度的影响。试验结果表明:熔滴过渡直接影响着整体成形的表面形貌、微观组织和硬度。其中熔滴过渡形式对成形效果的影响最大;一脉一滴为快速成形的最佳熔滴过渡形式,其成形的表面形貌良好、整体尺寸均衡、微观组织细小均匀、硬度适中、层间硬度波动小。 In order to improve the precision and performance of figuration, the systems of welding robot and high-speed camera video are used to investigate the effects of the behaviors of droplet transition on the figuration of passes-layers in arc rapid prototyping by pulsed gas metal arc welding (P-MIG) with double step. The effects of different transition speeds, droplet sizes and droplet modes on the surface appearances (including surface dimensions, face appearances and side appearances), microstructure and hardness are examined by changing the process parameters including pulse frequency and pulse time. Droplet transition significantly influences the surface appearances, microstructure and hardness of the figuration, especially the mode of droplet transition. The optimal mode of droplet transition for figuration is one droplet per pulse (ODPP). Good surface appearances, uniform integral figuration dimension, homogeneous microstructure and performance, moderate hardness with small fluctuation among layers are obtained with this mode.
出处 《机械工程学报》 EI CAS CSCD 北大核心 2009年第4期95-99,共5页 Journal of Mechanical Engineering
关键词 电弧快速成形 双阶梯 熔滴过渡 一脉一滴 Arc rapid prototyping Double step Droplet transition One droplet per pulse (ODPP)
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