WELDABILITY OF TANTALUM ALLOYS - II.
Abstract
A study of the weldability of complex tantalum alloys developed in recent alloy-development programs was conducted. The effects of a number of factors on fusion-weld ductility and crack susceptibility were evaluated. The results showed that ductile fusion welds can be made in many complex tantalum alloys, including Ta-10W-1Zr-Y, Ta-7W-3Re-1Hf-0.2Zr, and Ta-6.6W-3Re-3Hf, provided that the base material is of good quality and that proper machine welding procedures are used. The factors which most significantly affect the as-welded ductility of welds in these alloys are base-material alloy content, interstitial content, and fabrication history. The presence of yttrium is not necessary to obtain good as-welded ductility in these highly alloyed materials. However, there are indications that yttrium improves the resistance of welds to contamination during and after welding. Fusion welds in many tantalum alloys, including Ta-10W-2.5Mo and Ta-17W, can be made ductile by means of appropriate postweld heat treatment. Tensile joint efficiencies for welded tantalum alloys such as Ta-10W-1Zr-Y and Ta-6.5W-3Re-1Hf-0.4Zr-Y range from 80 to 100 percent at room temperature and from 90 to 100 percent at 3500 F. The highest as-welded tensile strength at 3500 F obtained in the program was 15.2 ksi for Ta-6.5W-3.1Re-1.2Hf-0.4Zr-0.002Y. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1967
- Accession Number
- AD0815775
Entities
People
- D. C. Martin
- P. A. Kammer
- R. E. Monroe
Organizations
- Battelle Memorial Institute