Thursday, July 8, 2010

RE: [MW:5901] Calibration

Dear Ajay ,

What do u mean by Grade1 category.

Regards,

Shashi Kumar

 

From: materials-welding@googlegroups.com [mailto:materials-welding@googlegroups.com] On Behalf Of DOKKU AJAY
Sent: Thursday, July 08, 2010 12:20 PM
To: materials-welding@googlegroups.com
Subject: Re: [MW:5900] Calibration

 

Dear Prashanth,

 

1. Welding Machines - Validation standard - BS7570:2000 (Please check for the latest one). Welding machines will be considered in Grade 1 Category with and accuracy requirement of 10%. Parameters which needs to be checked is Amps, Volts & Wire Feed Speed. Please note that the digital clamp meter you are using shall be calibrated to an acuurancy of Class 2.5 i.e 2.5% of full scale. Also, make sure that the power source needs to be stabelized for 30 minutes (Particularly in case of Generators).

 

2. Portable ovens - I have no idea for the same. However, you may check with calibration agencies within you region. Generally it cannot be calibrated as the temperature fluctuation within the oven is more. i.e. if you set the electrode holding oven at a temperature of 100 deg.cent, you may notice that the temperature fluctuates from 80 to 120 deg cent & never keep stable as the ovens have ventellation. The purpose of ventelation is to keep the temp. in the oven stabelized. We do the monitoring of ovens once a year.

 

Ajay

 


 

 


From: Qamlr <qamlr@cicb-chemicon.com>
To: "materials-welding@googlegroups.com" <materials-welding@googlegroups.com>
Sent: Thu, July 1, 2010 8:44:17 AM
Subject: [MW:5812] Calibration

Dear Team members

Kindly advise on following querries

·         Calibration of   Portable ovens and welding machines to traceable standards

·         Adequcy of one thermo couple to holding oven which is constantly kept at 100 deg C  after initial redrying

Presently we are doing the Calibration of   Portable ovens and welding machines by our own developed procedure using digital clamp meter ( used as a master, and this master is traceable to national and international standard)

Thanks & Regards

Prashanth Hegde

CICB-Chemicon

Mangalore

 


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