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TWI Software News EN 287-1:2004

TWI Software News EN 287-1:2004

A new edition of EN 287-1:2004 'Qualification test of welders - Fusion welding - Part 1: Steels' has been released. It supersedes BS EN 287-1:1992 which has been withdrawn. This standard is one of a large number of new and updated standards currently being prepared by Technical Committee CEN TC 121. It was originally developed as an ISO document (pr EN ISO 9606-1) but has now been released purely as an EN- standard.

The new document has many changes from the 1992 version. Most are minor and clarify vagaries in the previous edition, but some are more significant changes include :

  • A completely new set of base material groupings which form the basis of the range of qualification of base materials. There are now more groups than previously and all groups have new sub-groups. A new Table 2 has been developed to specify ranges of approval for given test piece materials.
  • There is a new process designation '125:SAW with cored wires' and '137:FCAW with inert gas' has been removed.
  • Test welds in pipe now qualify production welds in plate only if the test weld was made on pipe over 25mm diameter.
  • The range of qualification for pipe diameter has now been simplified so that test weld groupings are either <=25mm or >25mm with ranges D-2D and 0.5D and above.
  • The new standard is much more explicit about the use of multiple tests to qualify a single production weld and the use of multi-process test welds.
  • For a fillet weld test, the throat thickness must be in the range 0.5T - 0.7T. This means that to qualify a fillet weld of throat thickness 8mm, the test weld must be made on base material of thickness 12mm to 16mm irrespective of the thickness of plate to be used in production.
  • In test methods, a new test is introduced, the 'notched tensile test', which is an alternative to bend or fracture tests for small diameter pipes (<= 25mm).
  • There is a new table (Annex D) specifying the variables to be recorded for production welds that are used to prolong qualifications after two years. These requirements are more stringent than the ranges of approval.
  • The new standard specifies that existing EN 287-1 qualifications still remain valid, but should be interpreted to the requirements of the 2004 edition at the end of their period of validity.
Welderqual is currently being modified to match the new edition of the standards.

Keep an eye on TWI's corporate web site ( http://www.twi-global.com) and the software web site ( http:www.twisoftware.com) for a more detailed explanation of the differences between the 1992 and 2004 editions.