Investigation of Weld Pool Structure and Property Control in Pulsed Arc Welding.
Abstract
Full penetration pulsed current gas tungsten arc welds on Fe-26Ni alloy sheets were dimensionally and structurally analyzed. Weld pool kinetics and weld surface ripple formation were studied using high speed motion pictures, conventional and scanning electron metallography, and x-ray dispersive analysis. The two dimensional heat flow computer model developed during the last year was modified to reflect more realistic convective flow in the weld pool, anode size and atmospheric heat loss. Work on thick plate welds and the computational model for 3D heat flow and solute segregation under pulsing were initiated. Some degree of structural control in the weld fusion zone of full penetration welds was found to be feasible. A mechanism for the formation of weld surface ripples and a technique of estimating local solid growth rates from the ripples were proposed. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 09, 1979
- Accession Number
- ADA078222
Entities
People
- G. G. Lessmann
- G. M. Ecer
- H. D. Brody