[MW:1017] RE: 527] Ceriated tungsten electrodes for GTAW

EIL has revised their specs for an upcoming project and this became mandatory (EWCe-2 in place of EWTh-2) for the project.

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From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of Bathula Raghuram (Mumbai - PIPING)
Sent: Thursday, January 24, 2008 10:33 AM
To: materials-welding@googlegroups.com
Subject: [MW:527] Ceriated tungsten electrodes for GTAW

 

EWCe Electrode Classification. Ceriated tungsten electrodes were first introduced into the United States in the early 1980s. These electrodes were developed as possible replacements for thoriated electrodes because cerium, unlike thorium, is not a radioactive element. The EWCe-2 electrodes are tungsten electrodes containing 2% cerium oxide (CeO2), referred to as ceria.

Compared with pure tungsten, the ceriated electrodes exhibit a reduced rate of vaporization or burn-off. These advantages of ceria improve with increased ceria content. EWCe-2 electrodes will operate successfully with ac or dc.

 

I understand these are available in India too and widely used by BHEL as thoriated electrodes are hazardous to health, members please share views.

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