The short answer

Not stated

The pages say holders of a certificate, licence or credential from another Canadian province or territory can apply for an Ontario Certificate of Qualification using a PDF application form, but they do not state whether an exam or assessment is required.

Source
“If you have a certificate, license or credential from another Canadian province or territory and would like to obtain an Ontario Certificate of Qualification, please note that the Canadian certificate holder application is currently not available through the Skilled Trades Ontario Portal.”
skilledtradesontario.ca/skilled-trades-ontario-portal

Both provinces

Licensed in Nova ScotiaMoving to Ontario
Licence status Voluntary certification Voluntary certification
Regulator Nova Scotia Apprenticeship Agency Skilled Trades Ontario
Guide Welder in Nova Scotia Welder in Ontario

Steps to transfer

  1. Review Canadian certificate guide

    Source
    “Review the Canadian Certificate Holder Guide and Form and follow the application instructions.”
    skilledtradesontario.ca/skilled-trades-ontario-portal
  2. Apply by PDF form

    Source
    “You must use the PDF application form and email or mail your application to Skilled Trades Ontario.”
    skilledtradesontario.ca/skilled-trades-ontario-portal

Processing time: Not stated by the regulator Check with Skilled Trades Ontario

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