Accession Number : ADA433883


Title :   High Strength Steel Welding Research


Descriptive Note : Technical rept. 1 Dec 2003-31 Dec 2004


Corporate Author : COLORADO SCHOOL OF MINES GOLDEN CENTERFOR WELDING JOINING AND COATINGS RESEARCH


Personal Author(s) : Liu, Stephen ; Edwards, Glen


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a433883.pdf


Report Date : 27 May 2005


Pagination or Media Count : 470


Abstract : The application of high strength low alloy (HSLA) steels has been limited by the availability of suitable filler metals. Specifically, as the weld metal strength increases, the susceptibility to hydrogen-assisted cracking increases. To take full advantage of the developments in HSLA steel base metals, weld filler metals which minimize the effects of diffusible hydrogen and develop tough microstructures must be designed. The benefit of yttrium-containing inclusions to provide effective hydrogen traps and reduce diffusible hydrogen levels, as well as, to act as intragranular nucleation sites to produce tough microstructures has been demonstrated. Furthermore, fluoride-containing consumables have been demonstrated to reduce weld metal diffusible hydrogen levels through reactions within the arc atmosphere. The current research was undertaken to study the effects on welding characteristics and weld metal properties when these two concepts are integrated into a single welding consumable. Additionally, current methods of quantifying the amount of diffusible hydrogen in a steel weldment are destructive and are performed only after the weldment has been deposited.


Descriptors :   *HIGH STRENGTH ALLOYS , *STEEL , *WELD METAL , MICROSTRUCTURE , OPTIMIZATION , SPECTROSCOPY , CRACKS , TOUGHNESS , STRENGTH(MECHANICS) , HYDROGEN , DIFFUSION , FLUORIDES , WELDING , YTTRIUM , FILLERS , BASE METAL


Subject Categories : Metallurgy and Metallography
      Fabrication Metallurgy
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE