CAJ | 학술논문

脉冲旁路耦合电弧熔化极惰性气体保护(Metal inert-gas, MIG)焊是一种新型的低热输入焊接方法，它通过特定的接法引入旁路电弧与主路电弧实现热、力的耦合，利用旁路电弧的分流作用，实现熔化母材热量与熔化焊丝热量的独立控制，从而在精确控制母材热输入的同时保证熔滴的自由过渡形式，可以实现铝-钢等异种金属的连接。为了理论分析不同焊接参数对焊接过程的影响，通过等效、线性化处理与迭代数值求解算法，建立可以正确描述焊接物理过程的动态数学解析模型；针对焊接过程中耦合电弧稳定性较差且直接影响焊接质量的问题，提出通过检测弧压波动的反馈信号、实时调节送丝速度、进而控制耦合电弧稳定性的闭环控制方案，并基于快速原型系统进行焊接过程控制仿真与试验。仿真结果表明，当焊接过程受到干扰后，采用闭环控制方案可以显著提高耦合电弧的稳定性；焊接试验证明了控制仿真的预测与分析，进行闭环控制后，焊接过程更加稳定同时得到了成形良好的铝-钢异种金属接头。
맥충방로우합전호용화겁타성기체보호(Metal inert-gas, MIG)한시일충신형적저열수입한접방법，타통과특정적접법인입방로전호여주로전호실현열、력적우합，이용방로전호적분류작용，실현용화모재열량여용화한사열량적독립공제，종이재정학공제모재열수입적동시보증용적적자유과도형식，가이실현려-강등이충금속적련접。위료이론분석불동한접삼수대한접과정적영향，통과등효、선성화처리여질대수치구해산법，건립가이정학묘술한접물리과정적동태수학해석모형；침대한접과정중우합전호은정성교차차직접영향한접질량적문제，제출통과검측호압파동적반궤신호、실시조절송사속도、진이공제우합전호은정성적폐배공제방안，병기우쾌속원형계통진행한접과정공제방진여시험。방진결과표명，당한접과정수도간우후，채용폐배공제방안가이현저제고우합전호적은정성；한접시험증명료공제방진적예측여분석，진행폐배공제후，한접과정경가은정동시득도료성형량호적려-강이충금속접두。
Pulsed double-electrode metal inert gas welding is a new kind of low heat input welding method. With different connection, parts of welding current bypassed and it controlled the base metal current and melting current separately. With free-flight metal transfer process, it could weld dissimilar metals. Aiming at the unstability of coupling arc in pulsed double-electrode metal inert gas welding process, a dynamic mathematic model has been built to truly describe and simulate the welding process with equivalent simplification, linearization and iterative solution. Then a control scheme is put forward and simulated, which changes the wire feed speed to adjust the main arc length, and further to control the stability of the coupling arc. Also the welding experiments with control scheme are carried based rapid prototyping system. Simulations proved the effectiveness of control scheme. And with controlling, the welding experiment is more stable and a good Al-Fe joint is acquired.