There are various tests involved in all these procedures. Every test has their own unique properties and is used in different cases required. For instance, there are non destructive tests which are used in detecting the flaws on the surface material of the metals. There should be no cracks before these materials go for the final usage in different machinery. These things have to be in use for years and should possess that strengthening material which can make it last for years. For that, it is compulsory that it should involve no flaws as such.
Let us focus on the metals and mechanical properties which further decide their tests appropriate for them. The mechanical properties determine the range and worth of the metals which helps in better understanding of the metals involved. Other common properties are hardness, strength, impact resistance and ductility.
Since strength is the ability of the metal to endure the external force, there are times when you need to test how much maximum load can this metal bear. Tensile Test determines well in advance the performance of the metal under actual stretching load. Once you know in advance the things about the metal loading g power, you deal with that machine accordingly. It does not break down then which is in benefit of the company itself. This test provides the information about elongation, elastic limit, yield strength, tensile strength, yield point as well as the reduction of the area.
There are some particular machines which are able to tell you the load and stress and all the possible movements in the duration of testing procedure. It tells you how it can handle it. Slowly and steadily, the pressure and load is increased leading to the elongation in proportion with the increasing load of tensile.
Tensile testing is also very useful in detecting the metal ductility. Now the question arises as to what is metal ductility? The answer is that it is one of the important properties of metal which lets it stretch without altering its shape. The altered shape is retained after the load is removed. Through the testing, you get to know the range of elongation.
This was all about the tensile testing. There are others which are involved such as NDT Training. All have their own things and procedures to be followed. Everything has its own specification and works according to that.