Oxygen Analysis in Manufacturing Industries - UV Curing and Industrial Welding

UV curing is a photo-polymerization process triggered by ultraviolet (UV) energy. During the process, a liquid, applied to a substrate, is converted into a solid cross-linked polymer material by electromagnetic radiation. This is an extremely fast process, which makes it very favorable for present manufacturing requirements for high throughput (increased productivity) and also higher product quality in comparison with other coating and curing processes. UV curing is also regarded as an environmentally friendly (GREEN) solution as companies are seeking additional ways to minimize the use of solvents, VOCs, and hazardous air pollutants.

UV Curing and Industrial Welding

While this process has several well-known advantages, the push for lower film weights on various substrates and many new applications have made the use of inert atmosphere curing compulsory to enable more complete cross-linking. Actually, some processes will not cure if oxygen (O2) is not excluded from the curing zone. The advantages of chemical resistance, lower photo-initiator levels, and enhanced adhesion bring a higher need for inert atmosphere curing.

The termination of the reaction by hydroperoxides, leading to the incomplete network formation at the surface and the remaining acrylate double bonds are commonly known and referred to as “oxygen inhibition”

Analytical Industries’ oxygen analyzers are extensively used for monitoring the blanketing at the time of the curing processes.

Blanketing in Curing Process

Application/Service Measurement Gas Stream Suggested Analyzer
Oxygen level monitoring during curing of plastics with UV or electron beam. 0 to 100 ppm
0 to 1% O2
N2 GPR-1600
GPR-2600

Trace Oxygen Sensors and Analyzers for Industrial Welding Gases

The use of inert gases plays a vital role in modern welding processes. The welding will be carried out in an inert gas protected atmosphere. Monitoring oxygen is important to produce high yield and enhance the weld quality since surplus oxygen will be detrimental to the weld seam.

Industrial Welding Gases

Different welding applications need different inert gases. Specialized gas producers prepare these gases and supply them to the end-user in the form of bottled gases. It is important for the purity of the inert gas mix that the bottling process is carefully monitored with an oxygen analyzer.

Controlled Welding Atmospheres

Application/Service Measurement Gas Stream Suggested Analyzer
Protecting welds from atmospheric (oxygen) contamination by purging the area immediately around the weld with inert gases is essential to enhancing quality and reducing costs. Common problems include coking, oxidation and discoloration during TIG welding process, titanium fabrication and welding of stainless steel pipes, tubes and tanks. 10 ppm to 20.9% N2, Ar GPR-1000
GPR-1100

Quality Control of Gas Cylinders

Application/Service Measurement Gas Stream Suggested Analyzer
Gas cylinder certification: specialty mixes including welding gas 0.1 ppm to 1% O2 Varies GPR-1600

This information has been sourced, reviewed and adapted from materials provided by Analytical Industries Inc.

For more information on this source, please visit Analytical Industries Inc.

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