用于铝合金焊接的中频MIG焊逆变器与工艺研究  

STUDY ON MEDIUM-FREQUENCY INVERTERS FOR MIG WELDING OF AI ALLOYS AND THEIR WELDING PROCESSES

作　　者：黄石生[1] 陆沛涛[1] 张小城 伍月华[1] 王志强[1] 

机构地区：[1]华南理工大学

出　　处：《机械工程学报》1994年第4期91-96,共6页Journal of Mechanical Engineering

基　　金：国家自然科学基金

摘　　要：阐述了用于铝合金焊接的中频脉冲ＭＩＧ焊逆变器的基本原理、特点和工艺效果。借助３１５Ａ场效应管式和６３０ＡＩＧＢＴ式弧焊逆变器，通过中低频调制把输出为８０ｋＨｚ和４０ｋＨｚ的脉冲频率，变成１ｋＨｚ以下的中频脉冲，对航天用铝合金板材进行ＭＩＧ焊工艺的试验研究。结果表明，该技术具有逆变式电源的高效省料轻巧等优点之外，它比现有的低频脉冲和直流ＭＩＧ焊技术具有更能保证熔透，“清洗”作用强，焊缝组织晶粒细化，微气孔倾向减少和接头强度高等突出优点，因此，具有很好的推广前景。This paper deals with the principlei the characteristics and the process results of the medium-frequency pulse MIG welding inverters. By means of 315A MOSFET inverter and 630A IGBT inverter for are welding, MIG welding tests of Al alloys used in space industry are conducted, in which the output pulses 80kHz and,40kHz of the inverters are modulated to medium-frequency pulses of less than 1kHz. The tests show that this MIG welding technology has the advantages over the current low frequency pulse welding and DC MIG welding in getting better penetration, stronger“etching effect”, finergrain structure of weld, smaller tendency to the generation of mioro-gas hole and greater strength of welding joint, and thus has a broad prospect.

关 键 词：MIG焊 中频脉冲 逆变器 铝合金 

分 类 号：TG457.14[金属学及工艺—焊接]