Liquids

One tried and true nondestructive procedure, utilized to see surface marks and flaws in samples, uses a penetrating fluid, either visibly coloured or fluorescent. After being smeared on the surface of the sample material and allowed to sink into any small imperfections, the dye is wiped off, leaving totally revealed cracks and flaws. An analogous process, used for nonmetals, employs an electrically charged liquid rubbed on the nonmetal surface. After excess liquid is cleaned off, a dry powder of opposite charge is sprayed on the surface of the sample and attracted to the cracks. Neither of these techniques, however, can detect internal breaks.

Radiation

Internal, like external imperfections, can be located with X-ray or gamma-ray tests in which the radiation passes through the object and implicates on an ideal photographic film. Under some circumstances, it may be possible to target the X rays on a significant part within the piece, bringing up a 3-dimensional perspective of the flaw markings as well as its location.

Sound

Ultrasonic inspection of areas requires transmission of sound waves out of human hearing range within the sample. By the reflection method, a sound wave is transmitted over one area of the subject, reflected off the other area, then returned onto a receiver situated at the first part. Upon isolating a flaw or weak point in the material, the signal is reflected and its traveling time changed. The actual delay becomes a signal of the location of the flaw; a map of the test piece can be made to isolate the location and form of the weaknesses. With the through-transmission method, the transmitter and receiver need to be located on the opposite ends of the test piece; interruptions in the passage of the sound waves are utilized to find and measure weaknesses. Sometimes a water medium is utilized in which transmitter, sample, and receiver will be immersed.

Magnetism

As the magnetic characteristics of a material are heavily formed by its overall form, magnetic techniques can be used to measure the situation and relative size of weaknesses and marks. In magnetic testing, an apparatus is utilized that contains a sizeable stretch of wire through which flows a steady alternating current (primary coil). Located inside the initial piece is a shorter coil (the secondary coil), to which is secured an electrical measuring device. The steady current in the initial coil generates electrical current to move through the secondary coil by the technique of induction. If an iron bar is inserted into the secondary coil, sudden changes in the further current should signal flaws in the rod. This process only finds differences in parts along the length of a piece and cannot detect longer or continued imperfections very much. A similar process, utilizing eddy currents induced by a primary coil, also might be used to find marks and weaknesses. A steady current is induced in the test subject. Cracks that are located across the track of the current alter resistance of the test item; this determination may be measured with better processes.

Infrared

Infrared methods have also been used to detect material continuity in complicated construction situations. By testing the value of adhesive joints between the sandwich core and facing sheets by a standard sandwich structure material like plywood, for example, heat is applied to the face of the sandwich skin material. In the case that bond lines are found to be continuous, the core areas provide a heat signature within the surface material, and the local temperatures of the face will fall evenly along these bond lines. When the bond line can be not enough, gone, or mistaken, however, this temperature will not change. Infrared photography of the area does isolate the placement and area of the failing adhesive. A similar process employs thermal coatings that change hue when reaching a set temperature.

Finally, nondestructive techniques also are sometimes found to permit a total understanding of the mechanical properties of a test item. Ultrasonics and thermal processes seem to be most valuable in this situation.

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

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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