Which method of the inspection is the right one?
Which method of the inspection is the right one? Inspection is one of the most important works in the manufacturing, oil and related industry, and choosing the method of inspection is another important work. You have to know about the materials and the procedures and the inspection method to decide which method is appropriate for this work. This decision will affect everything; the cost of project, the time of evaluation of the test results, and also the result of the test. You should know what kind of defect this procedure may have or what kind of defect you want to look for in this project. Sometimes we can detect a defect using two or three methods, but every method has its ability, and they are sensitive to a special group of defects. Another thing is the cost. Every method has a different cost, we can detect a defect by using a different method and it will cost less for us. For example there are two usual methods for detecting defect near the surface in metal. One is (PT) Liquid Penetration test, and the other is (MT) Magnetic Particle Test, usually the Magnetic Particle Test is cheaper, but if we have a stainless steel object, we can not use this method because stainless steel is non-magnetic.