If the rebar grade or diameter changes significantly, a new qualification may be required.
In the EU and UK, construction products must adhere to harmonized standards. EN ISO 17660-1 is often cited in tender documents and construction contracts. Auditors will ask for proof of compliance. en iso 176601 pdf
The standard permits specific fusion welding processes for load-bearing joints. The choice of process depends on the joint geometry and site conditions. If the rebar grade or diameter changes significantly,
As for the PDF version of EN ISO 17660-1:2017, it is widely available for purchase from various online sources, including: en iso 176601 pdf