摘要
在铝合金CO2激光焊接时,通过填充焊丝向焊接熔池注入外加电流,直流电源的一极与填充焊丝相连,另一极在熔池后方与工件相连,由此构成电流回路。研究结果表明,随着外加电流的增加,焊缝熔深和面积增大,且焊缝表面成形更加均匀,鱼磷纹更加细密,即外加电流提高了焊接效率,改善了焊接过程的稳定性。进一步研究表明,外加电流的电阻热对焊接结果的影响极小。外加电流对铝合金CO2激光焊接的影响归因于电流的磁流体效应。
By making use of the magnetohydrodynamic effect of electrical current, a new aspect of CO2 laser beam welding of aluminum alloy with an electrical current addition was reported. During the laser beam welding, an electrical current was supplied to the weld pool via the filler wire. By connecting one pole of a DC power source with the filler wire and the other with the workpiece in the rear of the weld pool, a closed electric circuit was built. It is found that this new technique increases the welding efficiency and flexibility, and improves the process stability-the weld depth and area increase considerably and the bead ripples become finer and more uniform with the increase of the current. Further experimental results demonstrate that the resistive heating of the wire has less influence. Thus it can be concluded that the influence of the current on CO2 laser beam welding of aluminum alloy results from the electromagnetic effect of current.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2006年第5期9-12,共4页
Transactions of The China Welding Institution
基金
国家863高技术研究发展计划项目(2001AA337030)
北京市自然科学基金资助项目(3022002)
德国教研部德中科技合作项目(CHN00/391)
