高速短路过渡气体保护焊控制及工艺

Control and process of high speed short circuit arc welding

在数字控制绝缘栅极晶体管逆变电源平台基础上,研究了短路过渡高速焊接工艺的参数匹配和波形控制规律.在焊接电流相同的条件下,随着焊接速度提高,最佳匹配电压逐渐降低.且硬特性的电弧可以在较低的电弧电压下具有良好的稳定性,适合高速焊接工艺.研究了燃弧电压下降速度和焊接热输入以及电弧稳定性之间的关系,降低燃弧电压下降速度可以提高焊接电弧能量,但应当使电弧电压调节到稳定值所需的时间略小于该工艺参数下的燃弧平均时间.结果表明,当焊接速度为1.5m/min时,焊缝外观美观,熔透均匀,符合集装箱侧板对接焊的质量要求.

Short circuit arc welding parameters and waveform control are researched on the basis of IGBT inverter welding power supply.Under the same welding current,optimum arc voltage will decrease with the increasing of welding speed.And it is proved that hard arc is more stable under lower voltage,which is suitable for high speed welding.The relationships among energy input,arc voltage dropping speed and arc stability are studied,and it is demonstrated that a lower voltage dropping speed will lead to a higher arc energy,but the adjust time of voltage should be less than average arc time.The welding experiments prove that the weld appearance and fusion are good when the welding speed is 1.5 m/min,which meet the requirements of container manufacturing.