. Canadian foundryman (1921). be all right in time, but whyso much procrastination? The Annealing of Aluminum ALUMINUM caslings such as oil pans of motor cars are•somewhat difficult to weld when broken, owing to theliability of the part drawing out of shape while cooling orcracking owing to the locked-up stresses. If the part changesshape much it will be impossible to reassemble it, and ifheld rigidly to a steel frame while cooling off so as tomaintain the original form there is danger of cracking. In this connection it is of interest to note a method employedby coppersmiths to anneal lai-ge c
. Canadian foundryman (1921). be all right in time, but whyso much procrastination? The Annealing of Aluminum ALUMINUM caslings such as oil pans of motor cars are•somewhat difficult to weld when broken, owing to theliability of the part drawing out of shape while cooling orcracking owing to the locked-up stresses. If the part changesshape much it will be impossible to reassemble it, and ifheld rigidly to a steel frame while cooling off so as tomaintain the original form there is danger of cracking. In this connection it is of interest to note a method employedby coppersmiths to anneal lai-ge copper and brass sheets andkeep them flat. The same method is used for aluminum andmonel sheets. After being heated the sheets are laid betweendry pine boards and left to cool. The boards are excellent heat-insulators and as the wood chars and smolders for a time?the slow combustion helps to maintain the heat. The sheetscool very slowly and when finally cool will be found sort andeasily bent. 40 CANADIAN FOUNDRYMAN Vol. XII. Scraps ^fe=^ from *? ^~-^f foundry Scrap Pile^
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectfoundri, bookyear1921
