Author: Stanford Research Institute

Publisher:

Published: 1961

Total Pages: 29

ISBN-13:

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).