{"id":10361,"date":"2020-07-16T11:33:20","date_gmt":"2020-07-16T09:33:20","guid":{"rendered":"https:\/\/rittmeyer-beri.de\/?page_id=10361"},"modified":"2021-01-11T17:33:46","modified_gmt":"2021-01-11T16:33:46","slug":"sonotrodes-functional-test","status":"publish","type":"page","link":"https:\/\/rittmeyer-beri.de\/en\/sonotrodes\/sonotrodes-functional-test\/","title":{"rendered":"Sonotrodes<\/span> \u2013 Functional Test"},"content":{"rendered":"

Crack- and Functional Tests on Sonotrodes and their Repair<\/h2>\n

Sonotrodes are expensive special tools. Therefore, each sonotrode construction should be designed in such a way as to guarantee an as long as possible service life. In case that the sonotrode does no longer work properly, it would be sensible to look for the reason.<\/p>\n

For example, sonotrodes may crack due to a variety of reasons. (For further information, read our  eBook \u201eLousy Waves\u201c<\/a>).<\/p>\n

Crack Tests on Sonotrodes
\n<\/span><\/h3>\n

When assessing a sonotrode, the first thing to do is to test its basic functions and to sort out if the amplitude follows an even curve progression and if the frequency lies within a range which still can be \u201ccaught\u201c by the generator. The USM 3.1<\/a> together with an oscilloscope enables a quick test, even when in progress or during the production.<\/p>\n

\"Measuring

Measuring the sound waves and the frequency with the USM 3.1<\/p><\/div>\n

Should there be a clear indication that the sonotrode has a crack, there will be no further need of continuing since cracks on sonotrodes cannot be repaired.<\/p>\n

It is very easy to determine cracks: The sonotrode \u201cscreeches\u201c loudly. This is due to the fact that the sound wave movements \u2013 which are not, or hardly, heard when working with an accurate sonotrode- lead to side frequencies within the crack and which fall within an audible range. On the other hand, the sonotrode\u00b4s impedance rises considerably. In most cases a cracked sonotrode cannot even be set into oscillations.<\/p>\n

It is always sensible to detect the progress of the crack, since, it may show a faulty construction or a faulty use.<\/p>\n

A common method for finding crack evidence is the so called Penetrant Testing<\/a>. This method is not only non-destructive, but also easy to use, safe and very reliable.<\/p>\n

\"With

With the so called Penetrant Testing (PT), two different means are applied. The cracks are easily detected thanks to an intense red colouring<\/p><\/div>\n

There may be various reasons for the appearance of cracks. In most cases it is due to faulty constructions, operating errors, imprecise manufacturing or material fatigue.<\/p>\n

Cavity<\/strong><\/h3>\n

However, another reason for a cracking might be that a material with cavity inclusions has been used. Such a material is completely unsuitable for the construction of sonotrodes.<\/p>\n

\"\"<\/a>

Cavity zone in a cut-open sonotrode. When under sound waves, cavities lead to voltage peaks and a total loss of the sonotrode<\/p><\/div>\n

Rework on Sonotrodes<\/h3>\n

Nevertheless, sonotrodes are also subject to mechanical abrasion (especially when working with the so called metal-metal contact, to be found in film or tissue processing) and which after some time may make them unsuitable for extra sensitive or accurate applications. The possibility of reconditioning should already be envisaged when designing them. It is quite possible to construct the sonotrodes for many applications and enable their working surface so that it can be ground several times.<\/p>\n

\"Sonotrode

Sonotrode with abrasion and pitting (left). Sonotrode after post-processing \u2013 cost around 20% of the original price (right).<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Sonotrodes are expensive special tools and should be constructed to guarantee a long service life —- If it does no longer work properly, ask for the reason —– The USM 3.1 ultrasonic wave sensor measures quickly and easily the amplitude and frequency of sonotrodes \u2026<\/p>\n","protected":false},"author":1,"featured_media":15177,"parent":3156,"menu_order":6,"comment_status":"closed","ping_status":"closed","template":"page-right-sidebar.php","meta":{"footnotes":""},"yoast_head":"\nSonotrodes \u2013 Functional Test - FEINTECHNIK R.Rittmeyer GmbH<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rittmeyer-beri.de\/sonotroden\/sonotroden-funktionspruefung\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Sonotrodes \u2013 Functional Test - FEINTECHNIK R.Rittmeyer GmbH\" \/>\n<meta property=\"og:description\" content=\"Sonotrodes are expensive special tools and should be constructed to guarantee a long service life ---- If it does no longer work properly, ask for the reason ----- The USM 3.1 ultrasonic wave sensor measures quickly and easily the amplitude and frequency of sonotrodes \u2026\" \/>\n<meta property=\"og:url\" content=\"https:\/\/rittmeyer-beri.de\/sonotroden\/sonotroden-funktionspruefung\/\" \/>\n<meta property=\"og:site_name\" content=\"FEINTECHNIK R.Rittmeyer GmbH\" \/>\n<meta property=\"article:modified_time\" content=\"2021-01-11T16:33:46+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/rittmeyer-beri.de\/wp-content\/uploads\/Amplitudenmessung-mit-USM-frei_quad.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"1200\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data1\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/rittmeyer-beri.de\/sonotroden\/sonotroden-funktionspruefung\/\",\"url\":\"https:\/\/rittmeyer-beri.de\/sonotroden\/sonotroden-funktionspruefung\/\",\"name\":\"Sonotrodes \u2013 Functional Test - 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