Weldon Laboratories Inc.

Weldon, United States

Weldon Laboratories Inc.

Weldon, United States

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Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2014

Gas chromatography (GC) is a useful tool for investigating paint failures caused by the use of an inappropriate or unauthorized thinner. Gas chromatography-mass spectroscopy (GCMS) is extremely useful at determining the identity of individual components of a sample. GC along with GCMS can also determine the amount of the sample. Additional steps can be taken to quantify the solvent identified as being responsible for establishing a particular peak. GCMS is also useful in investigating the blistering of coatings used in water immersion service.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2014

Spectroscopy can be broadly defined as the study of the interaction of light with matter. Associating a specific date with the beginning of spectroscopy is difficult, since spectroscopic effects have been observed for a very long time, even it there was no understanding of what was causing them. The electromagnetic spectrum includes visible light, ultraviolet light, microwave radiation, X-rays and infrared radiation. The underlying chemical and physical principles, on which infrared spectroscopy is based, are the concepts that molecules comprise various atoms joined to one another by chemical bonds.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

The latest edition of Investigating Failure dealt with a problem encountered on a 15,000-squre-foot coated concrete floor in a new engineering research facility. The specification called for the floor to be roughened by vacuum abrasive blast-cleaning to achieve an International Concrete Repair Institute (ICRI) grade of CSP-3 and CSP-4. The owner of the engineering research facility was not happy with the performance of the coated concrete floor, as the usage of heavy carts had damaged it and left paths or tracks of haziness in the fine finish of the floor surface after a period of around two months of construction of the concerned floor.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

The article discusses the failure of the flaking of paint from factory-coated motor housings. The non-failing motor housing had a glossy gray coating on it, which appeared to be in very good condition, even in the flanged area where the two halves were joined. The connections on the non-failing sample were examined using a stereo zoom microscope with magnification to 30 times. The anvil has hinged blades, such that as the metal flows outward the blades open, causing the diameter of the punched metal. It should not be confused with the more familiar bisphenol-A-type epoxies used in the industrial maintenance coatings market. The failing sample was similar to the non-failing sample, except for spots of flaking paint around the perimeters of some of the connections. The flaking occurred on the upper half of the flange, where the punch would have entered the metal.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

G. Weldon from Weldon Laboratories, Inc., informed how ductile pipes and fittings supplied to a water treatment plant in mid-Atlantic state in the US caused damage without coatings failure. G. Weldon informed the aging of such pipes and fittings caused damage in many facilities without any coatings failure. Extensive investigation into the cause of rupture of the topcoat of these pipes revealed that the problems were occurring in the clarifier room, which contained many different diameters and configurations of pipe. This room was humid and some of the pipes were sweating badly, while others were damp. The investigators concludes that the prevailing conditions in the clarifier room caused failure of the topcoat of the pipes and fittings.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

There are a number of reasons why a paint or coating might fail prematurely. The paint could be too thin or too thick. It could be full of voids, making it overly porous. The coating may not have flowed out properly, with excessive orange peel that may have compromised its barrier properties or even its adhesion due to insufficient, wetting of the substrate. A non-skid epoxy coating was applied to a concrete floor. The owner was very unhappy with its performance as it was softer and much more prone to wear and mechanical damage than expected.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

Pattern recognition is the latest technique, which can help in determining the cause of coating failure and address the concerned problem. Pattern recognition means identifying and correlating events with locations and subsequently correlating chemical or physical properties with the given locations. This depends more on curiosity and making good observations for asking the right questions if the investigator has not been onsite.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

A municipality in a mid-western state in the US decided to overcoat the deteriorating paint system on an old bridge in place bearing the cost of blast-cleaning the structure and applying a new coating system, to overcome budgetary constraints. The municipality developed a specification with input from an engineering firm, which involved pressure washing of the existing alkyd coating system to remove any poorly adherent coating, along with power tool cleaning to remove any small areas of corrosion. All the coats were calcium sulfonate alkyds and had the same composition except for pigmentation.


Weldon D.G.,Weldon Laboratories Inc.
Journal of Protective Coatings and Linings | Year: 2015

The service bays of a large automobile dealership lost the gloss of the coated surface over a period of time. Samples submitted to the laboratory for testing consisted of three 2.5 inch-diameter core samples removed from the coated floor along with the liquid coating material. The first core sample examined was from a non-failing area of the floor. Subjective knife probing showed that that the coating system had good adhesion to the concrete and the light gray topcoat was glossy. Subsequent examination of other core samples revealed the exact cause of the failure of the coating material.

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