214 BLACKSMITHING 



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 tempera- 

 ture of heated metal, and both accurate and rapid manipula- 

 tion 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 compara- 

 tively 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 ham- 

 mer 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 to- 

 gether. 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. 



