The dynamic performance of welding machine not only afects the trajectory precision of the welding torch and position precision of photoelectric detection

but also relates to the stability and reliability of the machine. The modal analysis of welding machine first was carried out in this article

and the reasonable of the model design was verified. The structure can avoid the work rotation frequency of the motor efectively and the resonance occurrence. Secondly

the harmonic response analysis of the welder was done

structural weaknesses were attained and improvement measures were proposed.