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Arc attachments on aluminium during tungsten electrode positive polarity in TIG welding of aluminium

  • In modem AC power sources, both balance and current of EP (tungsten electrode positive) and EN (tungsten electrode negative) can be readily adjusted. According to conventional assumptions the surface of aluminium workpieces is cleaned during EP but the tungsten electrode is more heated due to electron work function. During EN the tungsten electrode cools down and the workpiece is melted. Therefore, optimal settings of the power source mostly aim for maximal penetration and minimal electrodeIn modem AC power sources, both balance and current of EP (tungsten electrode positive) and EN (tungsten electrode negative) can be readily adjusted. According to conventional assumptions the surface of aluminium workpieces is cleaned during EP but the tungsten electrode is more heated due to electron work function. During EN the tungsten electrode cools down and the workpiece is melted. Therefore, optimal settings of the power source mostly aim for maximal penetration and minimal electrode wear. This paper presents a study of arc attachments in TIG welding on aluminium. Two different arc attachments to the cathodic workpiece could be attested with only one of them actually cleaning the surface. The first one is a spot mode (highly dynamic) that attaches to the edges of oxide layers and cracks them. The second one is also a spot mode, but it attaches to weld pools. It does not clean the surface but heats the base material intensively. Both arc attachment modes compete against each other. As a result, the cleaning area narrows with wider weld pools due to an increasing attachment to the weld pool during EP. The influences on the arc attachment to the aluminium cathode as well as the contradictions in present literature are discussed. Possible adjustments of the AC balance for optimized processes are proposed.show moreshow less

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Metadaten
Author:Sascha Rose, Julia Zähr, Michael Schnick, Uwe Füssel, Sven-Frithjof GoeckeORCiDGND, Mark Hübner
DOI:https://doi.org/10.1007/bf03321325
ISSN:1878-6669
Parent Title (English):In: Welding in the World 55 (2011) 9-10, pp 91-99
Document Type:Article
Language:English
Year of Publishing:2011
Date of Publication (online):2014/01/21
Release Date:2014/01/21
Volume:55
Issue:9-10
First Page:91
Last Page:99
Institutes:Fachbereich Technik
Dewey Decimal Classification:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
University Bibliography:Hochschulbibliografie
Licence (German):Creative Commons - Namensnennung, Nicht kommerziell, Keine Bearbeitung
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