Form and shape give definite clues as to the identity of the metal. The appearance metal composition test includes such things as color and appearance of machined as well as un-machined surfaces. These tests are as follows: Appearance Test These should be supplemented by tables 7-1 and 7-2, which present physical and mechanical properties of metal, and table 7-3, which presents hardness data. Six of the different tests are summarized in table. There are seven tests that can be performed in the shop to identify metals. Summary of Metal Composition and Identification Tests Welders and metal workers must be able to identify various metal products so that proper work methods may be applied.Īny engineering drawing should be examined in order to determine the metal to be used and its heat treatment, if required.Īfter some practice, the welder will learn that certain parts of machines or equipment are always cast iron, other parts are usually forgings, and so on. Nickel, chromium, and iron are used to make nichrome.It is necessary to know the metal composition before welding in order to produce a successful weld.Copper or other metals can be blended with silver to make this alloy that reduces tarnishing. If the air contains sulphur compounds, silver will corrode and turn black. Sterling silver is made by combining 92.5 % silver and 7.5 % other metals, most commonly copper.It contains 96-98% of iron and 2-4% of carbon. Cast iron is formed by mixing iron with carbon.Tin and lead alloys are used to make solder.Alnico is a metal alloy made up of iron, nickel, cobalt, and aluminium.It contains approximately 18 % chromium and 5 % nickel. Stainless steel is made by mixing iron with chromium and nickel.It’s more corrosion-resistant and long-lasting. Steel is made by mixing 90 % iron and 1% carbon.Brass is used to improving copper’s electrical characteristics. Other components can be added in smaller amounts. It contains approximately 80 % copper and 20 % zinc. Copper and zinc are combined to make brass.To improve the overall characteristics, very small amounts of zinc, nickel, or manganese may be added. It has a copper content of 90% and a tin content of 10 %. Bronze was the first alloy to be discovered.The compositions of various alloys are given below: Some of the common alloys are Brass, Steel, Stainless steel, Bronze, Solder, amalgam etc. Also when the iron is mixed with chromium and nickel, we get an alloy called stainless steel, which is strong, tough and does not rust at all. When a small amount of carbon is mixed with iron, an alloy called steel is obtained. But it is never used in the pure form because pure iron is very soft and stretches very easily when hot. Aluminium metal is light but not hard, but an alloy of aluminium with magnesium is light as well as hard.Aluminium metal is light but not strong, but an alloy of aluminium with copper, magnesium and manganese is light as well as strong.Rusting of Iron - Explanation, Chemical Reaction, Prevention.Euclid's Division Algorithm - Real Numbers | Class 10 Maths.Class 10 RD Sharma Solutions- Chapter 2 Polynomials - Exercise 2.1 | Set 2.Mobile Technologies - Definition, Types, Uses, Advantages.Chemical Indicators - Definition, Types, Examples.Step deviation Method for Finding the Mean with Examples.Difference Between Electric Potential and Potential Difference.Theorem - The tangent at any point of a circle is perpendicular to the radius through the point of contact - Circles | Class 10 Maths.
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