Evaluation of PPT-2 Flux-Cored Titanium Weldment
Abstract
A titanium weldment fabricated in 1/2-inch thick commercially pure plate with the PPT-2 flux-cored wire was obtained from The Paton Institute for evaluation. The results of nondestructive inspection showed that the flux cored wire and welding procedures used to produce the weldment resulted in a sound weld with no indications of cracking or other internal defects. Chemical analysis showed acceptable carbon, hydrogen, iron and oxygen content for Ti-CP, grade 2 weld metal per ASTM B265. The nitrogen content of the weld deposit was well in excess of the specification allowable. The yield strength and elongation properties of the weldment did not meet the specification requirements of ASTM B265 for Ti-CP, grade 2 plate. A single bend ductility test failed to meet the 2T radius bend requirement of NAVSEA technical publication S9074-AQ-GIB-010/248. The elevated tensile and yield strength properties and low elongation are attributed to nitrogen contamination of the weld deposit. Interstitial contamination of the weld is believed to have occurred from the absorption of nitrogen into the weld puddle. This is based on the absence of a hardened surface layer which would be indicative of interstitial absorption through the slag covering into the solidified weld.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 2000
- Accession Number
- ADA384817
Entities
People
- Michael E. Wells
Organizations
- Naval Surface Warfare Center Carderock Division