TCAM

The tensile-strength test is within itself damaging; at the time of the process of collating information, the sample is destroyed. While this is acceptable when a plentiful supply of the sample exists, nondestructive techniques are safer for materials that are dear or hard to fabricate or that have been formed into finished or semicompleted samples.

Liquids

One commonly used nondestructive technique, used to see surface markings and imperfections in metal samples, uses a penetrating fluid, which needs to be visibly coloured or fluorescent. After being pasted on the surface of the sample and allowed to sink into any tiny flaws, the dye is cleared, leaving easily revealed breaks and imperfections. A similar technique, used for nonmetals, takes an electrically charged fluid smeared on the nonmetal surface. After superfluous fluid is cleaned off, a dry powder of opposite charge is sprayed onto the sample and sinks into the flaws. Neither of these techniques, however, can detect internal breaks.

Radiation

Internal, as well as external weaknesses, can be detected with X-ray or gamma-ray techniques in which the radiation passes through the object and impresses on an ideal photographic film. Occasionally, it can be possible to target the X rays onto a significant area in the object, allowing a 3rd dimensional perspective of the flaw identity as well as its location.

Sound

Ultrasonic inspection of parts takes transmission of sound waves higher than human hearing range through the material. In the reflection process, a sound wave is targeted from one area of the material, reflected off the opposite end, and returned into a receiver located at the starting point. Upon impinging on a flaw or weak point in the material, the sound wave is reflected and its movement altered. The actual delay is a measure of the location of the flaw; a map of the piece can be generated to locate the point and shape of the marks. By the through-transmission technique, the transmitter and receiver are situated on the opposite areas of the subject; interruptions in the transmission of the sound waves are studied to isolate and measure weaknesses. 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 material are largely formed by its overall form, magnetic methods are sometimes used to reveal the situation and approximate geometry of flaws and breaks. By magnetic testing, an object is used that consists of a sizeable measure of wire through which flows a steady alternating current (primary coil). Placed inside this initial wire is a smaller coil (the secondary coil), to which is attached an electrical measuring tool. The steady current in the primary coil makes further current to flow through the secondary coil through the method of induction. When an iron sample is put in the secondary coil, acute changes in the second current can signal marks in the bar. This technique only locates differentiations within sections on the length of a sample and will not detect long or continued flaws very much. A parallel skill, employing eddy currents induced by a primary coil, also may be utilized to detect imperfections and breaks. A steady current is induced in the test object. Flaws that exist across the track of the current change resistance of the test piece; this change can be measured under suitable tools.

Infrared

Infrared processes have also been used to find material continuity in involved construction materials. In testing the strength of adhesive bonds with the sandwich core and facing sheets in a typical sandwich construction material such as plywood, for example, heat is the face of the sandwich skin material. In the case where bond lines appear to be continuous, the core samples provide a heat sink in the surface sample, and the general temperatures of the skin then spread steadily on those bond lines. Where a bond line appears to be too small, disappears, or faulty, however, the local temperature can not adapt. Infrared photography of the face shall then isolate the situation and shape of the erroneous adhesive. A similar process uses thermal coatings that can change appearance when reaching a set heat.

Lastly, nondestructive techniques also are being seen to allow a entire determination of the mechanical elements of a test piece. Ultrasonics and thermal techniques appear to be most reliable in this regard.

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

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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