高强铝合金高频脉冲钨极氦弧焊的研究

本文对高强铝合金LD10的高频脉冲钨极氦弧焊进行了探讨。对采用这种工艺的原因,试验用的大功率晶体管电源,焊接工艺方法及它的优点进行了阐述。试验表明,采用该工艺焊接5mm厚的高强铝合金LD10 不需开坡口,焊接接头可用单面一次焊接双面成形;外形美观,内部质量优良。由于该工艺方法具有频率高,穿透力强的特点,因此可以提供比交流氩弧焊和直流氦弧焊较大的深宽比,较小的焊缝横断面,较细的显微组织及性能优良的焊接接头。

A STUDY OF HIGH FREQUENCY PULSED CURRENT HELIUM GAS TUNGSTEN ARC WELDING OF HIGH-STRENGTH ALUMINUM ALLOY

This paper discusses the high frequency pulsed current helium gas tungsten arc welding of LD10 high-strength aluminum alloy.The reasons for its adoption,the laboratory type high-output transistor power source,the welding process,as well as its advantages are described.Experiments indicate that by using this process to weld LD10 high-strength aluminum of 5mm thickness with square groove,a weld joint can be done by one side single pass welding.The single-pass weld has excellent internal quality and good surface appearance on both sides.Because of the high frequency and strong penetration characteristics,the process gives a greater depth-to-width ratio,a smaller transverse section of weld,a finer microstructure and better weld joint in quality than AC argon arc welding and DC helium arc welding.