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Types of Non-Destructive Testing

The tensile-strength test is basically futile; at the time of the process of gathering material, the sample is ruined. While this is not a problem when a safe supply of the sample is at hand, nondestructive tests are safer for materials that are costly or arduous to create or that have been constructed into finished or semicompleted products.

Liquids

One commonly used nondestructive test, utilized to find surface breaks and weaknesses in metal samples, uses a penetrating fluid, which is either visibly coloured or fluorescent. After being smeared on the surface of the sample material and set to sink into any tiny cracks, the dye is removed, leaving readily uncovered imperfections and imperfections. A similar technique, used for nonmetals, uses an electrically charged liquid painted on the sample surface. After excess fluid is rubbed off, a dry powder of opposite charge is sprayed onto the sample and draws to the cracks. Neither of these techniques, however, can locate internal weak points.

Radiation

Internal, as well as external imperfections, can be identified with X-ray or gamma-ray machines in which the radiation passes through the object and impresses on an appropriate photographic film. On some occasions, it can be possible to focus the X rays to a particular part within the object, creating a 3-dimensional description of the flaw geometry along with its site.

Sound

Ultrasonic inspection of areas takes transmission of sound waves out of human hearing range within the test sample. In the reflection method, a sound wave is transmitted from one part of the subject, reflected by the other part, and signalled back to a receiver that is situated at the original point. When impinging on a weakness or crack in the piece, the signal is reflected and its traveling time adapted. The actual delay then becomes a sign of the location of the flaw; a map of the test piece can then be made to show the point and geometry of the cracks. By the through-transmission method, the transmitter and receiver need to be located at the opposite areas of the subject; interruptions in the transmission of the sound waves are found to locate and measure cracks. More often than not a water medium is used by which transmitter, sample, and receiver are immersed.

Magnetism

As the magnetic traits of a sample are strongly shown by its overall form, magnetic methods can be utilized to measure the location and relative dimensions of flaws and breaks. In magnetic testing, an item is employed that contains a large stretch of wire through which flows a steady alternating current (primary coil). Held in the initial wire is a smaller coil (the secondary coil), to which is attached an electrical measuring device. The steady current in the larger coil causes current to flow through the secondary coil by the process of induction. If an iron bar is placed into the secondary coil, sharp changes in the secondary current can indicate flaws in the sample. This technique only detects differentiations between parts in the length of a piece and cannot find elongated or continued defects very easily. An analogous process, using eddy currents induced in a primary coil, also might be utilized to find marks and cracks. A steady current is induced within the test sample. Flaws that are found across the signal of the current change resistance of the test object; this determination may be measured by better methods.

Infrared

Infrared processes have sometimes been utilized to detect material continuity in involved structural objects. In testing the value of adhesive joins between the sandwich core and facing sheets by a usual sandwich structure object such as plywood, for example, heat is applied in the surface of the sandwich skin object. Where bond lines are found to be continuous, those core parts reveal a heat marking in the surface piece, and the general temperatures of the surface will fall steadily along these bond lines. When the bond line can be inadequate, missing, or erroneous, however, the local temperature does not change. Infrared photography of the front will then show the location and geometry of the marked adhesive. Another such technique utilizes thermal coatings to change appearance when reaching a devised heat.

Lastly, nondestructive test methods also are being shown to permit a total determination of the mechanical properties of a test piece. Ultrasonics and thermal techniques are the most valuable in this situation.

Looking for NDT Brisbane? For Brisbane non-destructive testing, contact Just Inspections today.

April 14th, 2010Uncategorized Read More >No Comments

Good Reasons to Pay Your Suppliers on Time

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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