A general approach based on constrained parameter-optimization for the implicit representation of information concerning welding processes

• Published in: Journal of materials engineering and performance Vol. 7; no. 6; pp. 761 - 771
• Main Authors: LAMBRAKOS, S. G, MILEWSKI, J. O
• Format: Journal Article
• Language: English
• Published: New York, NY Springer 01-12-1998; Springer Nature B.V
• Subjects: Applied sciences; Constraints; Exact sciences and technology; Heat transfer; Joining, thermal cutting: metallurgical aspects; Mathematical analysis; Metals. Metallurgy; Morphology; Representations; Temperature dependence; Welded joints; Welding; Weld metal; Analysis method; Electron beam welding; Welded joint; Morphology; Weld penetration; Modeling; Laser welding
• ISSN: 1059-9495; 1544-1024
• DOI: 10.1361/105994998770347332

An analysis of weld morphology which typically occurs in deep penetration welding processes using electron or laser beams is presented. The method of analysis is based on geometric constraints with formal mathematical foundation within the theory of constrained parameter optimization. The analysis presented in this report on electron beam welding of 304 stainless steel serves as an example of the application of the geometric-constraints method to the analysis of weld fusion boundary morphology where there can be fragmented and incomplete information concerning material properties and only approximate information concerning the character of energy deposition, thus making a direct first principals approach difficult. A significant aspect of the geometric-constraints method is that it permits the implicit representation of information concerning temperature dependence of material properties and of coupling between heat transfer and fluid convection occurring in the weld meltpool.