Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . the weld was cold, the collar on the bottom and oneside was planed off 1/4 of an inch below the original surface ofthe casting, in order to show the place where the two metals hadjoined. The riser also was cut off, leaving the collar, weld was absolutely solid, not a single blow hole appearinganywhere—not even the riser. Reactions, Vol. I, 1908, published by Goldschmidt Thermit Co. 156 WELDING The welded section (now 3 3/4 x 5 1/4 inches), with collarI inch thick on top and on one side, was
Welding; theory, practice, apparatus and tests, electric, thermit and hot-flame processes . the weld was cold, the collar on the bottom and oneside was planed off 1/4 of an inch below the original surface ofthe casting, in order to show the place where the two metals hadjoined. The riser also was cut off, leaving the collar, weld was absolutely solid, not a single blow hole appearinganywhere—not even the riser. Reactions, Vol. I, 1908, published by Goldschmidt Thermit Co. 156 WELDING The welded section (now 3 3/4 x 5 1/4 inches), with collarI inch thick on top and on one side, was then placed in wheelpress on supports 14 3/4 inches apart and a piece of hardenedsteel, I inch square, placed as shown in figure 87. A pressure of 170 tons was applied before breaking. Thefracture started at the bottom outside welded section, extendinginto the center of the weld at the top. The fracture showed thatperfect amalgamation of the metals had taken place. In comparing the strength of this weld with original stock,assuming a maximum stress in the outer fiber for cast steel of. r—64—^ Fig. 87.—Arrangement of test piece for test No. i. 60,000 pounds to the square inch, a section 3 3/4 x 5 1/4 inchestested in the same way would break at 100 tons. In this test No. i it is presumed that the 12 pounds ofpunchings were mild steel. The manganese was used to freshenthe iron, and most of it probably slagged as manganese oxid andcame to the surface. Test No. 2. Two test bars taken from the upper part of a previously,but unsuccessfully, poured casting gave, on an average, 66,000pounds per square inch tensile strength and 9. 5 per cent, elonga-tion on a measured length of 2 inches. This casting showed inall the sections a clean, non-porous, dense grain. It appearspossible, therefore, to produce steel castings of thermit and, in a Iron Age, April 26, 1906. THE THERMIT PROCESS 157 case of necessity, the higher price would not be of importance. H: 4: >{: L Test No. 3. The t
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