Farm Mechanics by Fred D. Crawshaw E W. Lehmann

Author:Fred D. Crawshaw, E W. Lehmann
Format: epub
ISBN: 9781620870594
Publisher: Skyhorse Publishing (Perseus)

FIG. 205. “T”-weld.

FIG. 206. Welded clevis.

FIG. 207. Wagon wrench.

While it is true that the punched screw clevis required a welding heat, the exercise of welding on it was comparatively simple. Welding is probably the most difficult forge work. It requires a perfectly clean fire, exactly the proper temperature of heated metal, and both accurate and rapid manipulation of tools. The end weld is one of the simplest of all the welds. It should be practiced until it can be made upon first trial, when other welds will be accomplished with comparatively little difficulty.

It is necessary always to have the two pieces of metal to be welded first hammered into the proper shape. Both must then be given the welding heat at the same time, taken out of the fire together, quickly placed one on the other, and then immediately hammered with light, quick blows, while the stock is changed in position on the anvil to permit the hammer to strike all portions which must be joined.

Just before taking the iron from the fire, it is well to put some kind of flux on each of the surfaces to be placed together. Sal ammoniac or rosin is generally used.

Working Instructions for Two-Piece Weld:

Stock: Two pieces of wrought iron or soft steel, each about 5/8" in diameter and 4" long.

185. Preparing the Scarfs. Heat one end of each piece of stock to lemon color and upset it to 3/4" from the end. This is done by setting the stock on end on the face of the vise and pounding the end to be upset (Fig. 208), then rounding the enlarged part of the stock on the face of the anvil (Fig. 199).

Reheat each piece of stock to lemon color and scarf the up-set end to shape, shown at A, Fig. 203. Each scarf should be one and one-half times the diameter of the stock.

186. Making the Weld. Place scarfed surfaces of each piece of stock down in the fire and heat to white or welding heat. Grasp one piece with the hollow-bit tongs in the left hand, and the other with the flat-jawed tongs in the right hand. Take both pieces from the fire, quickly turn the one held by the right band as it is moving toward the anvil, so as to place it quickly on the anvil under the scarf of the piece held with the left-hand tongs, as shown in Fig. 204. Instantly drop the right-hand tongs and pick up the hammer which should be lying near at hand. Strike quick, sharp blows on the ends to be welded, at the same time turning the pieces with the left-hand tongs. Continue until the two pieces are thoroly joined, then until the diameter is reduced to that of the original stock and the surfaces of the stock at the weld are smooth.

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