Abstract
In this paper, the author tries to determine the mechanical properties, such as tensile strength, impact resistance, linear expansion and shrinkage, of all electrically welded steel at elevated and lowered temperatures which range from -40 to 600°C.
The author may have privilege of dealing with the necessity for these investigatins as a problem, believing that our knowledge on the properties of welded steel at room temperature predicts what the properties of the same metal would be at elevated and lowered temperatures.
The absorption of nitrogen is one of the most important of the physical properties of welded Steel. The author takes up practical aspects of the influence of nitrogen on the mechanical properties on the edge-hardening.
Next, he deals with the forging properties of the metal at higher temperature, and the specific gravity of welded metal and mild steel at lower temperature.
Finally, he shows graphically the result of edge-hardening of the same metals at a very low temperature, which was created by ice-water, coagulated mercury and liquid air, respectively.
