低热输入推拉送丝CO2焊接工艺

传统短路过渡过程熔滴过渡随机发生,短路与燃弧时间比例范围较大,燃弧与短路期间的能量分配比例也随之起伏不定.推拉送丝CO₂焊接系统利用焊丝的送进-回抽与波形控制相结合的控制方式,促使熔滴在较小的电流下进行过渡,实现稳定可控的短路过渡CO₂焊接过渡.通过焊接参数的合理选定,控制回抽焊丝强制熔滴过渡,可有效减小等效燃弧电流I_ea和等效燃弧电压U_ea,从而降低热输入量.当推拉送丝系统中焊丝的送进与回抽时间相等时,焊接过程中短路/燃弧的时间也大致相同,无较大波动,燃弧与短路能量分配比例也较为稳定,可以控制在一个较小的值.结果表明,采用相同送丝速度时,推拉送丝短路过渡燃弧期间能量远小于传统的短路过渡,采用推拉送丝CO₂焊接系统可实现过程精密控制的低热输入短路过渡的焊接过程.

Low heat input push-pull feeder CO2 welding process

During the traditional short-circuit transition process metal transfer occurs randomly,the time ratio of shortcircuit to arc ranges,and energy distribution is unstable. Pushpull feeder CO₂ welding system,which maintaining the metal drop transiting in a low current to insure the CO₂ short circuit transition welding steady,is controlled by the push-pull motion together with waveform. With the matching parameters determined, pulling out the wires to force droplets transfer,has declined the equivalent arc current Iea and voltage Uea and reduced the heat input. The wires system in a similar period of time has push and pull motion completed,which means the time of short-circuit and arc is similar,and the energy distribution is also stable. The experimental results demonstrate that,a certain speed has improve the energy much more efficient,and the pushpull feeder CO₂ welding system is a method with low heat input and effective control.