The Effects of Corporate Governance on Firms' Credit Ratings

A method for monitoring welding of a workpiece includes selecting light of a predetermined wavelength from that emitted by plasma produced by the welding process, generating signals indicative of the selected light's intensity, and correlating those signals with the cross-sectional area of the weld. An apparatus for monitoring welding of a workpiece includes a filter for passing selected light of a predetermined wavelength emitted by plasma, a signal generator which produces signals indicative of the intensity of the selected light, and means for correlating the signals with the weld's cross-sectional area.