采用4种冷金属过渡焊接工艺(CMT)分别在不同热输入水平下,使用ER2319焊丝进行AA2219-T851高强铝合金的平板堆焊成形,全面分析其焊缝成形和气孔分布特征.结果表明,常规CMT焊缝具有明显指状熔深特征,气孔缺陷严重并呈全焊缝分布状态;CMT-P焊缝母材熔化面积明显增大,气孔数量显著减少且在适当控制热输入时有助于消除气孔;CMT-ADV焊缝也具有指状熔深特征但熔深显著减小;CMT-PADV焊缝具有显著球形熔滴成形特征且熔深最小,两工艺低热输入和对焊丝表面氧化膜的清理作用有助于消除气孔.
The weld bead geometry and the porosity of AA2219-T851 high strength aluminum alloy welds with ER2319 wire produced by different cold metal transfer (CMT) processes and heat inputs were investigated.The results show that a narrow finger-shaped geometry is observed using the conventional CMT process and a large number of gas pores exist in the lower and upper parts of welds.Compared to results of above mentioned CMT process,the weld melting area is increased using CMT-pulse (CMT-P) process,and it is beneficial to reduce the porosity effectively with an appropriate heat input.The finger-shaped geometry with lower melting depth using CMT-advanced (CMT-ADV) process and the spherical-shaped bead geometry with lower dilution using CMT-pulse advanced (CMT-PADV) process are achieved.The gas pore is reduced predominantly and even eliminated due to the lower heat input and the effective oxide cleanliness of wire ends for the two processes.
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