(中南大學 機電工程學院，高性能復雜制造國家重點實驗室，
有色金屬先進結(jié)構(gòu)材料與制造協(xié)同創(chuàng)新中心，長沙 410083)
摘 要: 針對6005A-T6鋁合金型材攪拌摩擦焊接頭缺陷補焊的應用要求，研究攪拌摩擦焊(FSW)補焊和熔化極氣體保護焊(MIG)補焊工藝，對兩種補焊接頭的力學性能進行分析。結(jié)果表明：FSW補焊與MIG補焊方法均可以消除FSW接頭缺陷，兩種補焊接頭的強度均達到無缺陷的FSW接頭強度的88%以上，F(xiàn)SW補焊接頭的平均抗拉強度為216.72 MPa，平均屈服強度為145.5 MPa，略高于MIG補焊接頭的平均抗拉強度(206.2 MPa)和平均屈服強度(134.07 MPa)。兩種補焊的接頭硬度最低值都出現(xiàn)在熱影響區(qū)，最高值都出現(xiàn)在母材區(qū)。
關(guān)鍵字: 6005A-T6鋁合金；攪拌摩擦焊；熔化極氣體保護焊；補焊；力學性能
（Nonferrous Metal Oriented Advanced Structural Materials and Manufacturing Cooperative Innovation Centrer,
State Key Laboratory of High Performance Complex Manufacturing, School of Mechanical and
Electrical Engineering, Central South University, Changsha 410083, China）
Abstract:For the repairing welding demands of friction stir welding defects of 6005A-T6 aluminum alloy, the repairing welding processes of friction stir welding (FSW) and metal inert-gas welding (MIG) were investigated. The mechanical properties of the repairing welding joints prepared by FSW and MIG processes were analyzed. The results show that both the repairing welding methods can eliminate the FSW defects and the strength of the repairing welding joints can reach above 88% of the strength of defect-free FSW joints. The tensile strength and the yield strength of the FSW repairing welding joints are 216.72 and 145.5 MPa, which are slightly higher than those of MIG repairing welding joints (206.2 and 134.07 MPa), respectively. The lowest microhardnesses of both the FSW and MIG repairing welding joints appear in the heat-affected zone, and the highest microhardnesses appear in the base metal zone.
Key words: 6005A-T6 aluminum alloy; friction stir welding; metal inert-gas welding; repairing welding; mechanical property
