The effects of intermixed weld metal on mechanical properties. Part 1
- Lincoln Electric Co., Cleveland, OH (United States)
- Edison Welding Inst., Columbus, OH (United States)
It is common for individual weld joints to be fabricated using a combination of electrode types and welding processes. While this situation arises most often as a result of repair welding, it also can arise due to scheduled fabrication sequencing, which requires a change from one electrode and/or process to another within the same weld joint. When weld metals deriving their properties from different metallurgical mechanisms are intermixed in the same joint, the resulting properties of the combination have caused some concern. This work is the first in a series that examines the intermixing of conventional carbon-manganese weld metals with various self-shielded flux cored arc weld metals. In this case, two different shielded metal arc weld metals are combined with various self-shielded flux cored arc weld metals. The effects of dilution from the underlying self-shielded flux cored root layers on the mechanical properties of shielded metal arc weld metal are examined. Variations in both tensile and Charpy V-notch impact properties have been documented. The effect on tensile results is limited to relatively minor changes in ductility. Reductions in Charpy V-notch impact energies were noted in all cases. The results are evaluated in terms of the chemical composition gradients and weld microstructure variations that result from dilution. Possible mechanisms are discussed.
- OSTI ID:
- 334097
- Journal Information:
- Welding Journal, Vol. 78, Issue 3; Other Information: DN: Paper presented at the AWS annual meeting, April 13--17, 1997, Los Angeles, CA (US); PBD: Mar 1999
- Country of Publication:
- United States
- Language:
- English
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