As regards cold pressure welding, the writers carried out tests with the following results : Figures of merit (Al to Al, 35%; Cu to Cu, 22%) were larger than F. C. Kelley's data reported in the Welding Journal, August, 1951; dissimilar metal cold pressure welding (Al to Cu, Brass to Ag, Steel, to Al) gave satisfactory bonds and cold pressure welding with inserted alloys (Al to Cu to Al, Cu to A1 to Cu, Steel to A1 to Steel) was also successful. The writers developed the study on this problem to such an extent that application of this process has been widened from non-ferrous to ferrous alloys (steel to steel; figure of merit, 8%) which hitherto admitted of no hot pressure welding. This unique process of steel cold pressure welding can be applied manually or by hand tools, only the simplest equipments and no special training being required for it.
Authors treated of the arc welding methods and techniques for rail joints of a suburban electric railway of Tokyo. The contents are arranged in the following order: 1. Preface, 2. Various kinds of welding for rail joint, 3. Testing methods of rail joints, 4. The first test, 5. Tension test of vertical welding, 6. The second test, 7. Investigation of welded rail, 8. Weldership, and 9. Conclusion.
In this Report the authors intend to announce the results of welding research using radioactive isotope S35. In this experiment S35 was used as a tracer to examine the state of equilibrium between slag and weld metal with respect to S in the case of electric arc welding. S35 (in the form of sodium sulphate, Na2SO4) in the coating of electrodes passes to slag and weld metal through welding, so that by measuring the intensity of radioactivity of both slag and weld metal, the distribution ratio can be known and by comparing with that of coating the passing ratio can be determined. As the result of thin experiment it was known that : 1) In spite of its weak energy, a small amount of S35 can be detected from outside, when it exists in the weld metal, so that the segregation of S in weld metal can easily be determined by Geiger-Müller counter. 2) The passing ratio increases gradually for both slag and weld metal in the case of abrupt cooling (S in flux ranging 0-0.09 wt.%), but it begins to decrease over the range of 0.06% of S in the case of slow cooling. 3) Vaporization increases with increase of S% in the coating. The slower cooling speed, the more vaporization in the case of same amounts of S contents in the coatings.