Saturday, December 18, 2010
Thursday, December 2, 2010
Monday, November 15, 2010
PerkinElmer to Launch New Digital X-Ray Flat Panel Detectors for Non-Destructive Testing at ASNT Fall Conference and Quality Testing Show
Saturday, October 30, 2010
Monday, August 30, 2010
Olympus Provides a Comprehensive Weld Inspection Solution for Pipes With a Diameter as Small as 21.3 MM
Friday, August 13, 2010
Thursday, August 12, 2010
Sunday, April 25, 2010
- Clean the surface of the ferromagnetic material
- Magnetize the material
- Spray or pour the magnetic particles
- Visual inspection
Friday, April 16, 2010
Sunday, April 11, 2010
Another video with a more advanced MPI
This one is in Spanish, though the MPI shown very well, and the crack is well visible. MPI usually find cracks which are perpendicular to the direction of the flux, so It's necessary to search for defects twice. I'll explain more about that in a future article, but first it's important to see and understand the basic chemistry of this method.
Tuesday, April 6, 2010
Friday, March 19, 2010
Friday, March 5, 2010
Some days ago I heard that Sri Lanka's ministry of tourism is going to develop a village called Kalpitiya in the western cost of the island, as a new tourist destination. I tried to find more information. It is quite a nice place with many small islands, white sandy beaches and yea! dolphins. Looking forward to travel there and see how it looks like.
Wednesday, March 3, 2010
Wednesday, February 24, 2010
Commercial aircrafts are frequently inspected visually. There is a primary inspection called "walk around check" both in the line and the base, transit checks, daily check, weekly check, A check, B check etc…
Line is the more about the quick checks while aircraft is in the park or in between flights.
Base is mostly the hanger, where hard checks, repairs take place.
A qualified engineer walk around the aircraft and inspect structural items visually. Engine is also checked during the walk around checks. There engineer watches for oil leaks, structural damages in the engine, inlet of the engine for composite parts fixtures to the structure, fan/first stages of the compressor, last stages of the turbine for deterioration or damages , or any unusual changes of the engine.
In this example shows how, engineer/Pilot carry on a walk around inspection of a Boeing 777 aircraft.
- Pack inlet and exhaust
- Negative pressure relief vents
- Wing illumination light
- Static ports
- Positive pressure relief valves
- Forward outflow valve
- Crew oxygen thermal discharge disc
- L pitot probe
- L ice detector probe
- TAT probe
- L AOA probe
Tuesday, February 9, 2010
Thursday, February 4, 2010
Visual Inspection is one of the most common NDT methods used to evaluate the condition and provide a better quality of an item. Visual method is easily carried out, inexpensive and usually does not require special equipment. It entails reflected or transmitted light from a test object being imaged with a light-sensitive device, such as the human eye.
Wednesday, January 27, 2010
As we saw in the beginning, 2nd Section of technical diagnostics is about functional methods. They consist of:
• Evaluation of long term and short term statistical data such as, the temperature of the part/machine, Pressure of the hydraulic systems, fuel/air consumption etc… By analyzing such parameters, engineer can predict the economical use of the part/machine and prognosis future failures, so that it will be possible to remove it and put a new part/ or totally stop using the machine before a catastrophe.
• By analyzing the physical and chemical parameters such as the spectral analysis of oil in order to detect foreign particles (for example, small particles of metals can be found in oil system when a ball bearing is destroyed, and that can lead to a failure of the whole machine)
• Vibration diagnostics: where engineer analyses the vibration of machine and evaluate faults and trends. An experienced engineer watches the frequency spectrum of the vibration without even touching the machine, say where exactly problem is, and propose options to cure that defect.
Figure: An NDT engineer preparing instrumentation for a vibration analysis of a gas turbine engine
Wednesday, January 20, 2010
•Visual inspection: Visual examiners follow procedures that range from simply looking at a part to see if surface imperfections are visible. He can use the help of a magnifying glass or computer controlled camera. It is the most basic method of all.
•Liquid penetrant Testing: Engineer evaluates defects on the material surface with help of liquids or sprays.
•Eddy Current Testing: Engineer uses equipment with electromagnetic induction to detect flaws in or on conductive materials.
•Magnetic particle crack detection: Engineer evaluates defects of ferromagnetic materials by applying a magnetic field and magnetic particles which are usually mixed with a liquid.
•X-Ray: Use electromagnetic radiation to detect defects as same as in Medicine. Every one of us has seen an X-Ray image. This is one of the most trusted ways of controlling an object.
•Thermography: Engineer uses a camera containing large numbers of sensors sensitive to infrared radiation.
Sunday, January 10, 2010
As same as Buddha tried to find reason for sadness before cure, doctors try to find reason for illness before cure, Engineers do test and evaluate before thinking a cure for those mechanical objects. It is one of the most important parts of engineering which is closely linked to aerospace engineering, civil engineering, electrical engineering, material science and engineering, mechanical engineering, nuclear engineering, petroleum engineering, physics etc… It’s often used in both constructional and service sides.