Types of Non-Destructive Testing
Posted on April 14, 2010, under Uncategorized.
The tensile-strength test is innately fruitless; during the process of fostering information, the sample is ruined. While this is permissible when a plentiful sample of the sample is available, nondestructive methods are better for materials that are expensive or hard to make up or that have been made into completed or semicompleted samples.
Liquids
One common nondestructive technique, utilized to target surface markings and flaws in metals, requires a penetrating fluid, which needs to be brightly dyed or fluorescent. After being rubbed on the surface of the metal and set to soak into any perceptible cracks, the fluid is cleared, leaving readily revealed markings and flaws. Similarly, another method, applicable to nonmetals, uses an electrically charged liquid smeared on the material surface. After the extra liquid is removed, a dry powder of opposite charge is sprayed on the surface of the nonmetal and attracted to the flaws. Neither of these techniques, however, can detect internal weak points.
Radiation
Internal, as well as external flaws, can be identified through the use of X-ray or gamma-ray technologies in which the radiation passes through the object and impinges on an ideal photographic film. Under some circumstances, it may be possible to nominate the X rays onto a significant area in the sample, allowing a 3rd dimensional image of the flaw shape as well as its position.
Sound
Ultrasonic inspection of areas takes transmission of sound waves above human hearing range through the material. In the reflection process, a sound wave is sent over one side of the test material, reflected with the other side, then signalled onto a receiver located at the starting side. By impinging on a weakness or imperfection in the piece, the signal is reflected and its transmission disrupted. The actual delay is then a measure of the location of the mark; a map of the test piece can be created to locate the point and shape of the flaws. With the through-transmission technique, the transmitter and receiver are situated at the opposite parts of the material; interruptions in the passage of sound waves are used to find and measure marks. More often than not a water medium is used by which transmitter, sample, and receiver should be immersed.
Magnetism
As the magnetic aspects of a test piece are heavily influenced by its overall shape, magnetic processes are used to reveal the placement and approximate dimensions of flaws and breaks. With magnetic testing, a tool is utilized that contains a sizeable length of wire through which flows a steady alternating current (primary coil). Placed inside this primary object is a smaller coil (the secondary coil), to which is secured an electrical measuring tool. The steady current in the initial coil forces current to react in the secondary coil by the method of induction. If an iron piece is put into the secondary coil, sharp changes in the second current will isolate flaws in the piece. This technique only detects differentiations in parts along the length of a piece and does not find long or continued defects that much. An analogous process, utilizing eddy currents induced by a primary coil, also might be utilized to find marks and weaknesses. A steady current is induced in the test subject. Weaknesses that lie within the track of the current alter resistance of the test material; this alteration should be measured by the correct tools.
Infrared
Infrared processes also have been used to locate material continuity in complex constructual items. In testing the value of adhesive conjoinments between the sandwich core and facing sheets with a typical sandwich construct material such as plywood, for example, heat is applied to the face of the sandwich skin material. Where bond lines are continuous, those core samples show a heat marking on the surface material, and the local temperatures of the face will fall lightly on these bond lines. In the case that the bond line can be inadequate, disappears, or faulty, however, temperature should not change. Infrared photography of the front does demonstrate the placement and geometry of the flawed adhesive. A variation of this method employs thermal coatings that can change appearance upon reaching a determined heat.
Lastly, nondestructive test techniques also are sometimes sought to reveal a complete study of the mechanical elements of a test piece. Ultrasonics and thermal processes are most promising in this instance.
Looking for NDT Brisbane? For Brisbane non-destructive testing, contact Just Inspections today.
Sphere: Related ContentGood Reasons to Pay Your Suppliers on Time
Posted on December 21, 2008, under Uncategorized.
Many small businesses spend far too much time on debt collection rather than their core business. Over the last 2-3 months I’ve noticed an increasing lag in payment cycles.
If you are in any sort of operation that uses small businesses as service providers or product suppliers it’s well worth your while to pay your bills on time and completely ignore to some “clever” accountants mantra of not paying until the second reminder. Guess what? People are human and they will pay back and pay forward. One way or the other you will pay in the end for screwing around your suppliers.
Here’s why:
1. If you pay on time you will get much better service. I know with my clients, the one’s who pay on time or early get the best service, day or night 365 days per year. These are A-Class clients. They pay on time or early, don’t bitch about the price, and as a result get excellent service and great value for money. They respect me, and I respect them. We both win.
2. If you don’t pay on time you reputation is on the line. Small business owners love to gossip. They slag off any customers who pay late. And with the Internet so freely available, your reputation can become crap overnight with one blog post. This leads into …
3. If you don’t pay on time, you can end up paying a premium. The current cost of money is about 1.5% per month. If your payment reputation is shite, than expect to pay at least 10-15 % more than if it were good or unknown. In some cases bad payers can be locked out of they supply chain completely and have to spend enormous amounts of time to find a new supplier.
With existing suppliers, if you screw them around, they will either add 10% to their next quote, or refer you to a lower-class competitor - hoping to send them broke because you don’t pay when due.
4. If you pay on time your staff don’t get harassed by debt collectors from your supplier’s accounts departments. This is a big source of staff burn-out. If you pay on time your staff won’t have to make up excuses for late payment and may actually start to enjoy their jobs.
In summary, if you want good service, good products, happier staff and ongoing loyalty, pay on time or before time and ignore your accountant’s advice.
What do you think? Why do you like early payment or not?
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Sphere: Related ContentLaser Hair Removal Brisbane
Posted on December 16, 2008, under Uncategorized.