铝合金脉冲MIG焊动态特性自适应控制

铝合金因其独特的物理性质。在引弧短路与熔滴过渡短路、脉冲峰值阶段与脉冲基值阶段对脉冲熔化极惰性气体保护(MIG)焊有不同的动特性要求．据此提出了焊接过程中根据不同的焊接状态输出不同的动特性。满足铝合金MIG焊对动特性要求．采用短路电流控制器和动态电子电抗器。实现了脉冲MIG焊动态特性的自适应控制．具有动态特性自适应控制的脉冲MIG焊机引弧成功率高、电弧挺度好、飞溅小和焊缝成形美观．

Aluminum Alloys Pulsed MIG Welding Based on Dynamic Characteristics Self-Adaptation Control

For aluminum alloys pulsed metal inert gas(MIG) welding, spray transfer and excellent profile can be arrived during the whole welding current range, and the energy of droplet can be controlled to overcome losing of alloy elements with lower melting and steam point by controlling pulse current and pulse time. Due to the special physic properties of aluminum alloys, there are different requirements for pulsed MIG welding between starting arc short circuit and drop transfer short circuit, pulse period and base period. Self-adaptation control of dynamic characteristics was presented, in which different dynamic characteristics can be output according to different welding states, so that it can satisfy the need of aluminum alloys MIG welding. The self-adaptation control of dynamic characteristics of pulsed MIG welding was achieved by a short circuit controller and a dynamic electronic inductor.The welding machine with self-adaptation dynamic characteristics has high success rate of starting arc, stiffness of the arc, lower spatter and good weld appearance.