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Welding & Cutting Metals

Welding & Cutting Metals

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Would you like to start a potentially lucrative career or business with a welding skill? 

Acquiring a new skill in welding could give you a potentially high-paying career (Salary Range: $13.00-$26.44 per hour). 

It could also open for you a floodgate of new opportunities with various businesses and arts and crafts that you have only dreamt about of starting and enjoying. 

At last you can now start to learn welding - the art of joining and cutting metals with The Welding Course - right at the comfort of your home in your free time. 

The Welding Course is the textbook equivalent of a hands-on welding training. It prepares and orients you to the basic as well the advanced.

It contains all necessary information and data in one volume‚ making it possible for the workman to use one source for securing a knowledge of both principle and practice‚ preparation and finishing of the work‚ and both large and small repair work as well as manufacturing methods used in metal working. 

With almost a hundred illustrations‚ the 50‚084-word Welding Course will guide you step-by-step towards learning the art and craft of joining and cutting metals. 

CHAPTER I 

METALS AND THEIR ALLOYS -- HEAT TREATMENT 

THE METALS 

Iron.--Iron‚ in its pure state‚ is a soft‚ white‚ easily worked 
metal. It is the most important of all the metallic elements‚ and is‚ next 
to aluminum‚ the commonest metal found in the earth. 

Mechanically speaking‚ we have three kinds of iron: wrought iron‚ cast iron 
and steel. Wrought iron is very nearly pure iron; cast iron contains carbon 
and silicon‚ also chemical impurities; and steel contains a definite 
proportion of carbon‚ but in smaller quantities than cast iron. 

Pure iron is never obtained commercially‚ the metal always being mixed with 
various proportions of carbon‚ silicon‚ sulphur‚ phosphorus‚ and other 
elements‚ making it more or less suitable for different purposes. Iron is 
magnetic to the extent that it is attracted by magnets‚ but it does not 
retain magnetism itself‚ as does steel. Iron forms‚ with other elements‚ 
many important combinations‚ such as its alloys‚ oxides‚ and sulphates. 
.............

CHAPTER II 

OXY-ACETYLENE WELDING AND CUTTING MATERIALS 

Welding.--Oxy-acetylene welding is an autogenous welding process‚ in 
which two parts of the same or different metals are joined by causing the 
edges to melt and unite while molten without the aid of hammering or 
compression. When cool‚ the parts form one piece of metal. 

The oxy-acetylene flame is made by mixing oxygen and acetylene gases in a 
special welding torch or blowpipe‚ producing‚ when burned‚ a heat of 6‚300 
degrees‚ which is more than twice the melting temperature of the common 
metals. This flame‚ while being of intense heat‚ is of very small size. 

Cutting.--The process of cutting metals with the flame produced from 
oxygen and acetylene depends on the fact that a jet of oxygen directed upon 
hot metal causes the metal itself to burn away with great rapidity‚ 
resulting in a narrow slot through the section cut. The action is so fast 
that metal is not injured on either side of the cut. 

Carbon Removal.--This process depends on the fact that carbon will 
burn and almost completely vanish if the action is assisted with a supply 
of pure oxygen gas. After the combustion is started with any convenient 
flame‚ it continues as long as carbon remains in the path of the jet of 
oxygen. 

Materials.--For the performance of the above operations we require 
the two gases‚ oxygen and acetylene‚ to produce the flames; rods of metal 
which may be added to the joints while molten in order to give the weld 
sufficient strength and proper form‚ and various chemical powders‚ called 
fluxes‚ which assist in the flow of metal and in doing away with many of 
the impurities and other objectionable features. 

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Tags: oxy welding, impurity welding.

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