Patent ID: 6150631
Filing Date: 2000-11-21
Classification: B23K

Abstract:
A root gap detecting method in an arc welding process, comprising the steps of:controlling a weld seam tracking and a welding torch height;detecting a waveform of a welding voltage or a welding current of a welding arc;storing the waveform of said welding voltage or said welding current under an appropriate welding condition to a reference gap G.sub.ref as a reference waveform;obtaining the area .vertline..DELTA.SG.vertline. of a deviation part of a detected waveform to said reference waveform;obtaining .DELTA.SG by judging a positive and a negative of .vertline..DELTA.SG.vertline.;experimentally determining the relationship between the value of .DELTA.SG and a root gap G in advance; andcalculating the root gap G from the value of .DELTA.SG.