The authors are researching the plasma behavior in laser welding and the applicability to monitoring. In the first paper we described the relation between the monitoring signals and shielding gas plasma.
This paper describes the appearances of detective signals with changes of basic welding conditions, main results are as follows;
1. Amplitude of each signal showed more correlative with penetration depth than average of signals.
2. The correlation between an amplitude of each signal and welding condition was based on a plasma fluctuation which is influenced by the size of key hole and molten pool.
This work was performed under the management of ALERI (Applied Laser Engineering Research Institute) as a part of "the Leasing Basic Research Practical Use of Research Facility Centers" supported by NEDO (New Energy and Industrial Technology Development Organization).
