MT in pig signaller with welded base !
Magnetic particle testing (MT) is one of the oldest and most reliable nondestructive testing technologies. But few people can fully recognize it. In the field of material testing, people usually think that it is an unattractive but essential testing method. So we usually use it to inspect the pig signaller with welded base or other products.
Although many variable factors need to be considered in the process of testing materials. As long as the qualified operator operates the testing process, using reasonable instruments and equipment. And under strict procedures, this testing method will highlight its great advantages: direct, clear, simple, and reliable results. However, because it is relatively simple, people often abuse and misuse it.
Origin of magnetic particle testing
There are many opinions about the origin of magnetic particle testing technology. One of them is that in 1868, s.h.saxoby accidentally found a crack around a magnetized barrel with a magnetic compass. However, history does not tell people that they will eventually repair or directly discard the cracked barrels.
In most records, the potential application of magnetism was first used as a non-destructive testing technology in April 1919. At that time, W.E. Hoke applied for a national patent for a precision gauge block developed by himself. Generally speaking, when we accurately grind the surface of an equivalent block, small metal chips will gather and produce tiny cracks in the grinding process.
However, as for the origin of magnetic particle testing technology, most people agree that the technology originated in the United States and developed with the joint efforts of f.b.doane, Carl Betz and Taber de forest. The early application of magnetic particle testing technology mainly includes testing some railway parts, metal castings, and ferromagnetic materials.
