!()6 



Journal of Agriculture, Victoria. [ii Dec, 1911. 



The importance of being able to make a good weld will be manifest, 

 and at first one must be prepared to meet with failure, which is almost 

 inevitable. Patience, perseverance, and practice are important factors that 

 conduce to success. 



Consideration requires to be given to the following rules: — 



1. That tlie parts to be wielded are properly prepared- This is 



called scarfing. 



2. That the fire is free from clinker, and that there is a suflficient 



body of fuel to insure reaching a high temperature. 



3. That the metal is raised to the proper heat without burnings 



and that the surfaces to be joined are free from dirt. 



4. That the parts are laid together in the proper position. 



Welded Links. 

 About the simplest form of weld 

 is in a link for a chain. It might 

 be supposed that, after the descrip- 

 tion already given of how to make a, 

 split-link, the same procedure, 

 plus welding, would be observed in 

 making a welded one. Although a 

 link may be made by that method, 

 it would not be according to the 

 orthodox style of doing it, neither 

 would it be the best. 



To make the link in question, a 

 piece of round iron is cut to the 

 required length. The length is found 

 by the same method as in the case 

 of the split-link, but a greater allow- 

 ance requires to be made for waste 

 and compression in welding than in 

 pointing. A common rule for this is 

 to add on one thickness of the bar. 

 For instance, if it were required to- 

 wel d two pieces of iron i in. thick 

 together, so that the finished length 

 would be, say, 12 in., then the com- 

 bined length of the pieces before 

 welding would have to be 13 in. This 

 rule applies equally to round, square, 

 or flat bars. 



After cutting the pieces to the re- 

 quired length a beginning is made 

 by heating the central portion of the piece and bending it to the form 

 of the letter U, making the internal breadth equal to the finished link. 

 Next scarf the ends for welding. The object- of scarfing is to arrange the 

 ends so that, on being heated, the union is completed in the shortest 

 possible time ; also, to make the weld invisible, and to have that part 

 as strong as the rest of the bar. 



There are various ways of scarfing iron and steel, each according to 

 the nature of the weld and to the material. The scarf used for the link 

 is called a lap-scarf and is the most common. It is used for welding 

 straight bars of iron or mild .steel — for rings, links. &c. 



WELDED LINK. 



o. Showing position on anvil ready for scarfing. 



b. Scarfed ready for bending the ends. 



c. Finished link. 



