Access to certification Access to certification is not improperly restricted. The sole criteria for certification are given in the document and any subsequent amendments and no other criteria will be applied. Certification is not conditional on the candidate applying for other services or membership from TWI Certification Ltd, its parent, or any other groups or associations.
It is not authorised or notified to assess or establish conformity with the whole of the Directive. It carries overall responsibility for ensuring that the requirements for qualification testing are satisfied and that appropriate qualification certificates are issued following successful qualification tests. The particular requirements for qualification testing are given in the appropriate standard.
Examples are given in section 2. Qualification testing and the issue of certificates can only be carried out to recognised standard and it should be noted that the rules covering testing and validity of qualification certificates vary from standard to standard.
For example, some standards state that the Examiner or Examining Body must be acceptable to the contracting parties. Whilst TWI Certification Ltd makes every effort to ensure that its qualification certificates carry appropriate accreditation and that testing and certification activities are carried out in accordance with best practice, it cannot guarantee acceptance by any particular customer or client.
Individuals engaged by Examining Bodies to carry out assessment work in connection with the requirements of this document must be approved by TWI Certification Ltd, in accordance with procedures operated by the Examining Body and approved by TWI Certification Ltd. Testing of individual candidates or welding procedures is arranged between the manufacturer and TWI Certification Ltd or the Examining Body and the manufacturer.
The Examining Body will check that any pre-test requirements as applicable are fulfilled by the manufacturer or candidate s. Ask for rush delivery. Most backordered items can be rushed in from the publisher in as little as 24 hours. Some rush fees may apply.
Add to Cart. BS EN ISO , 4th Edition, October 15, - Specification and qualification of welding procedures for metallic materials - Qualification based on pre-production welding test There is no abstract currently available for this document. Complementary Documents and Links:. Active, Most Current Currently Viewing. Browse Publishers. Top Sellers. New Releases. My Account. Corporate Sustainability. Investor Relations. All Rights Reserved. Update Cart. If not, the contracting parties can agree to use one of the alternative methods.
For example, a welding procedure specification can be approved in accordance with the requirements of BS EN ISO previous experience on condition that the manufacturer can prove, with appropriate documentation, that the type of joint has previously been welded satisfactorily. The welder approval test is carried out to demonstrate that the welder has the necessary skill to produce a satisfactory weld under the conditions used in production as detailed in the approved WPS or Work Instruction.
As a general rule, the test piece approves the welder not only for the conditions used in the test but also for all joints which are considered easier to weld. As the welder's approval test is carried out on a test piece which is representative of the joint to be welded, it is independent of the type of construction.
The precise conditions, called 'essential variables', must be specified in the approval test, eg material type, welding process, joint type, dimensions and welding position. The extent of approval is not necessarily restricted to the conditions used for the test but covers a group of similar materials or a range of situations which are considered easier to weld. It is important to note that a number of Amendments and Corrigenda have now been issued which affect the range of approval see list of Relevant Standards.
The welder approval certificate remains valid subject to the requirements of the application standard. American standards have similar requirements although the extent of approval of the welding variables are different to those of BS EN ISO In clarifying the term 'welding operator', personnel who are using the equipment loading and unloading robotic equipment or operating a resistance welding machine do not require approval.
As specified in BS EN ISO , "Welding personnel — Qualification testing of welding operators and weld setters for mechanized and automatic welding of metallic materials" can be based on:. It should be noted that the methods must be supplemented by a functional test appropriate to the welding unit. However, a test of knowledge relating to welding technology which is the equivalent of 'Job knowledge for welders' in BS EN ISO is recommended but not mandatory.
Revalidation of the welding operator approval is generally in accordance with the requirements of BS EN ISO , except that route a requires retesting every six years and route b requires revalidation based on evidence every three years.
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