TEST

PROCEDURES

Endoscopic Examination

For an impression of the cooling channel and its soldered and welded joints, all copper hollow profiles may be examined with an endoscope to detect cross-sectional changes and deposits or tears inside the profile.

The endoscopic cooling channel examination is recorded on video, and the customer can view and comprehend any point of the examination.

Hot Compression Test

Under operational conditions hot compression strength tests are performed for all crucible furnace coils after cleaning of the metal. In that way any capillary cracks may be localized that cannot be found in the cold pressure test.

The test is run at a water temperature of approx. 85°C and a pressure of 15 to 20 bar for twelve hours and documented.

Helium Leak Rate Test

After the repair, all induction coils are subjected to a vacuum leak rate test. During this test step, even smallest leaks as well as any capillary cracks that were not detected during the hot compression test are localized through the use of helium.

Another material structure test will be run for any sites localized by this procedure, to make sure that this is only a local porous site in the material.

High-Voltage Test

During the final inspection of the induction coil the dielectric strength of the insulation is checked with a high voltage detector.

The test spectrum is performed at up to 6,000 V according to manufacturer specifications and recorded.

Material Structure Test

An independent institute performs a material structure test of the copper profile. The results of the tests are much more than a mere appraisal. For the thorough analysis is an opportunity to draw conclusions as to the reasons for the wear of the coil.

That knowledge, coupled with the longstanding experience of the operator, makes it possible to tell afterwards whether repair measures of the past were not performed properly or whether the copper profile material has been damaged.

X-Ray

The necessary radiographic test of weld seams is conducted with the help of X-ray films and an X-ray tube. This is done particularly for vacuum coils and it is performed by an external service provider that is extremely reliable.

With X-ray technology, especially pores and tears in the weld seam can be detected. The radiological findings are documented in a test report.

Final Inspection

Each component is measured and checked at all trouble spots prior to delivery.

This includes the labelling, measuring and examination to see if its state complies with the order. After the final inspection an examination report is prepared and provided to you.