Welding Fabrication Standards - EWF

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Welding Fabrication Standards Page 8 All these considerations lead to the development of specific standards, which were the EN 729 standards for fusion welding. The first edition of this standard is dated 1997; in 2005 the new revision is meant to be ready, passed into ISO numbering system as EN ISO 3834. In this chapter an overview of the most significant clauses of EN ISO 3834 will be given considering also the normative references that could be helpful in the fulfilment of such requirements. Figure 1 – Welding workshop (manufacturing of wind mills) 1.2 Use and field of application of EN ISO 3834 EN ISO 3834 is a standard independent of the type of construction manufactured that provides a method to demonstrate the capability of a Manufacturer to make products of the specified quality, both in workshops and at field installation sites. Therefore applicable measures for different circumstances are identified, such as the following: − in contractual situations for the specification of welding quality requirements; − by Manufacturers to establish and maintain welding quality requirements; − by committees, drafting manufacturing codes or application standards to specify appropriate welding quality requirements; Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
Welding Fabrication Standards Page 9 − by organisations assessing welding quality performance, e.g. third parties, customers, or Manufacturers. As a consequence, these International Standards can be used by internal and external organisations, including certification bodies, which could offer certification services by assessing the Manufacturer's ability to meet customer, regulatory or the manufacturer's own requirements. This International Standard is structured in five parts: − EN ISO 3834-1: Guidelines for selection and use; − EN ISO 3834-2: Comprehensive quality requirements; − EN ISO 3834-3: Standard quality requirements; − EN ISO 3834-4: Elementary quality requirements; − EN ISO 3834-5: Normative references to fulfil the requirements of EN ISO 3834-2, EN ISO 3834-3 and EN ISO 3834-4. It should be noted that the above standards define specific quality requirements at different levels, but do not assign those levels to any specific product group. The Manufacturers generally select one of the three levels (as specified in part 2, 3 and 4 of the standard) based on the following considerations regarding their products: − the extent and significance of safety critical products; − the complexity of manufacture; − the range of products manufactured; − the range of different materials used; − the extent to which metallurgical problems may occur; − the extent to which manufacturing imperfections, e.g. misalignment, distortion, weld imperfection, can affect product performance. When compliance to EN ISO 3834 part 2 or 3 is required, the requirements contained in this International Standard shall be adopted in full; however, in certain situations (e.g. where manufacturing is more suited to ISO 3834-3 or ISO 3834-4, or where particular operations are not technologically applicable and therefore cannot be undertaken), such requirements may be selectively amended or deleted. Whenever this situation occurs, the evaluation of the effective need for this “minimising of requirement procedure” shall be properly possibly evaluated and accepted by contractual parties and/or potential certification bodies. As to the relationship between EN ISO 3834, that applies to fusion welding manufacturing, and EN ISO 9001:2000, that applies to every kind of product or service, the first can be considered as a possible way to fulfil the latter requirements 1 . 1 However EN ISO 3834 are “stand alone” standard, as its application is viable, even if the company does not apply any quality management system to any of its activities. Istituto Italiano della Saldatura Lungobisagno Istria, 15 - 16141 Genova (I) - Tel. 01083411 - Fax 0108367780
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Welding Fabrication Standards - EWF

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