Feasibility Study of Plasma Welding of Refractory Metals
Feasibility Study of Plasma Welding of Refractory Metals

Author: Stanford Research Institute

Publisher:

Published: 1961

Total Pages: 29

ISBN-13:

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A ST DY WAS MADE OF THE FEASIBILITY OF FUSION WELDING OF THE REFRACTORY METALS WITH THE PLA MA TORCH. A torch with interchangeable nozzles of 1/16, 1/, and 1/4 in. diameter was developed for this purpose. Welding with the conventio al plasma torch was not possible, owing to severe bl wing of the weld pool by the high-velocity gas jet. With a new type of plasma torch, designed to operate at very low gas flow rates, disturbance of the weld pool was eliminated, and fusion welds were produced in steel, Mo, Ta, W, and Ta-10% W alloy. However, the high heattransfer rate, characteristic of the conventional plasma torch, was not obtained with the lowvelocity jet. It was concluded that the inertgas tungsten-arc and the electron beam are the most satisfactory methods for fusion welding of t e refractory metals. (Author).

Plasma Welding and Cleaning
Plasma Welding and Cleaning

Author: H. E. Pattee

Publisher:

Published: 1964

Total Pages: 76

ISBN-13:

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Plasma technology, as it applies to joining metals, is reviewed and the current status of both welding and cathodic cleaning of metals by plasma arc procedures is summarized. In order to produce defect-free welds, with high joint efficiencies in aluminum alloys by TIG welding procedures, very slow welding speeds, or specialized methods, must be used. Although application of the plasma arc to joining metals is still largely in the development stage, it appears to be an attractive welding process. The plasma arc is constricted whereas the TIG arc is unconfined. Because of the constriction, higher temperatures are available in the plasma arc. Thus, substantially higher welding speeds can be achieved than with the TIG process. Furthermore, the plasma arc characteristics are not as sensitive to minor variations in the process variables. The effectiveness of cathodic cleaning has been demonstrated by surface resistivity measurements. (Author).