Weld Leak testing

leak testingCarrs Welding are well known for their laser welding services, but increasingly Carrs have to test the jobs that they are welding. Carrs have 5 production jobs that they helium test, for example, an Inconel core which has dozens of welds, has to be tested at 3 stages during the assembly and welding process. I.e. some of the initial welds are covered by sequential welds and so we have to test the welds for quality before we can proceeded to the next weld.

Helium testing works on the idea that Helium is a tiny element and if there is a hole in a welded joint, it is the best gas to squeeze through and detect the leak. Generally Carrs pump the air out of the enclosed space that has been created by welding 2 or more parts together. When a vacuum has been created in the body of the job, the analysers is switched on. This looks at the rarefied atmosphere inside the assembly. Any Helium inside the job can be easily detected and quantified. For example; welding a connector into an assembly plate or casting.

Once evacuated the helium is introduced on the outside of the welded area with a small jet or needle. If a leak is detected the analyser will show an increased level of helium inside the job. The screen shows a long line and the machine beeps. This way a hole is pinpointed and a repair of the leak can be instigated. Once repaired the assembly is retested until no leaks are detected.

Helium leak testing is part of the welding process quality valuation and is not offered as a service on its own.

Spring Welding

Laser welding
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Just one of the jobs undertaken this week at CWT. Thousands of straight springs looped and welded by hand keeping the shop floor busy. CWT can offer:- Mould and tool construction / repair High precision welds Protected weld seam (enclosed) Clean surface (no product particles) Medical part welding

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Laser vs EB welding

News
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Laser welding and Electron Beam welding comparisons. Easy guide. The Disk or Fibre laser and the Electron Beam (EB) all make for good welding techniques and are both high power beam processes. They both produce neat repeatable welding procedures and due to the capital cost of the equipment are relatively expensive compared to conventional MIG […]

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Academia meets Medical meets Laser Welding

Laser welding
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A client came to Carrs while trying to combat a medical condition called ‘Persistent Nystagmus’, an abnormal rhythmic oscillation of the eyes that is estimated to occur in 0.24% of the population. This effects a person’s ability to control eye movements, having a substantial impact on quality of life. CWT were able to  successfully weld […]

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