Patent ID: 8258421
Filing Date: 2012-09-04
Classification: B23K,G01M,G05D,H05H

Abstract:
1. A shielding gas flow controller ( 100 ) for an electric arc welding apparatus for insertion into a shielding gas supply line between a shielding gas source ( 200 ) and a shielding gas valve ( 800 ) of the electric arc welding apparatus, the flow controller having a shielding gas ( a controllable gas valve ( 110 ) connected between the shielding gas in- and outputs and having a control input ( 170 ), and a controller means having a first input ( wherein the shielding gas flow controller further comprises an input pressure sensor ( an output pressure sensor ( a flow setting output modifying means adapted to modify the flow setting output of the gas flow setting control means based on the shielding gas input and output pressure measurements, the welding signal, and a charateristic of the controllable valve into a control signal (