Please refer the following standard: BS 7570 - code of practice for validation of arc welding equipment.
After reading this standard you have to write your own company procedure and include in QA manual.
Visit our group's blog at http://materials-welding.blogspot.com/ wherin this same topic has been discussed in the past.
Prem S Nautiyal
Mobile +91 9004063879 / 9769316004
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