Patent ID: 6084223
Filing Date: 2000-07-04
Classification: B23K

Abstract:
Method of welding workpieces, between which there is a gap, at least in portions, in whicha) at least one signal corresponding to radiation issuing from the workpieces during the welding process is generated for monitoring and controlling the welding process;b) limit values MAX (B.sub.0), MIN(B.sub.0) of the radiation signal which must not be exceeded or fallen below with gap width zero for maintaining a weld of predetermined minimum quality is determined in a preliminary test;c) the signal is compared with at least one predetermined limit value MAX(B), MIN(B) for checking the quality of the welding process and a fault signal is generated if this limit value is exceeded or fallen below;characterized in that in a preliminary testd) a correction formula (.increment.S (B)) is produced which represents the dependency of the radiation signal on a gap width (B) in the weld point (20) with a predetermined minimum quality of the weld;and during the actual welding processe) the width (B) of the gap (24) in the weld point (20; 220) is defined; andf) prevailing limit values (MIN(B), MAX(B)) are displaced by an amount (.increment.S (B)) corresponding to the prevailing gap width (B) in the weld point (20; 220) relative to the limit values MAX(B.sub.0 ), MIN(B.sub.0)) determined in preliminary tests on the basis of the correction formula (.increment.S (B)).