Purchase your copy of BS EN ISO as a PDF download or hard copy directly from the official BSI Shop. All BSI British Standards. A Reference number ISO (E) INTERNATIONAL STANDARD ISO First edition Approval testing of welders. ISO (E). INTERNATIONAL. STANDARD. ISO. First edition. Approval testing of welders — Fusion welding —. Part 3.
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A Reference number ISO Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
Draft International Standards adopted by the Technical Committees are circulated to member bodies for voting. Throughout the text of this standard, read ” ISO consists of the following parts, under the general title Approval testing of welders — Fusion welding: Steels — Part 2: Aluminium and aluminium alloys — Part 3: Copper and copper alloys — Part 4: Nickel and nickel alloys — Part 5: Titanium and titanium alloys — Part 6: This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by Augustand conflicting national standards shall be withdrawn at the latest by August The term ”copper” stands for copper and weldable copper alloys.
The ability of the welder to follow verbal or written instructions and testing of his skill are important factors in ensuring the quality of the welded product.
Testing of skill to this standard depends on welding methods in which uniform rules and test conditions are complied with, and standard test pieces are used.
The test weld can be used to approve a welding procedure and a welder provided that all the relevant requirements, e. This standard applies to the approval testing of welders for the fusion welding of copper. This standard is intended to provide the basis for the mutual recognition by examining bodies for approval relating to welders’ competence in the various fields of application. Tests will be carried out in accordance with this standard unless more severe tests are specified by the relevant application standard when these are applied.
During the approval test the welder should be required to show adequate practical experience and job knowledge test non mandatory of the welding processes, materials and safety requirements for which he is to be approved; information on these aspects is given in Annex A. This standard is applicable when the welder’s approval testing is required by the purchaser, by inspection authorities or by other organizations.
The welding processes referred to in this standard include those fusion welding processes which are designated as manual or partly mechanized welding.
It does not cover fully mechanized and automatic processes see 5. This standard covers approval testing of welders for work on semi-finished and finished products made from wrought, forged or cast material types listed in 5. The certificate of approval testing is issued under the sole responsibility of the examiner or examining body. These normative references are cited at the appropriate places in the text and the publications are listed hereafter.
For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. Aluminium and aluminium alloys EN Welding procedure specification for arc welding EN Non destructive testing — Penetrant testing — Part 1: Each criterion is considered to be a significant factor in the approval testing.
The welder’s approval test shall be carried out on test pieces and is independent of the type of construction. This standard covers the following welding processes: In general, a welder’s approval test shall involve depositing weld metal having a chemical composition compatible with any copper in the parent metal group s.
The welding of any one material in a group confers approval on the welder for the welding of all other materials within the same group. When welding parent metals from two different groups which do not give approval to each other according to table 4 see 6. When the filler metal is dissimilar to the parent metal group, an approval for that combination of parent metal group and filler metal is needed, except when permitted by table 4.
Material groups according to CR 5. A test is listed for each of the ranges of plate thickness and pipe wall thickness or pipe diameter as specified in tables 1 and 2.
It is not intended that thicknesses or diameters should be measured precisely but rather the general philosophy behind the values given in tables 1 and 2 should be applied. One test piece per position. A minimum weld length of mm is required, but not more than three test pieces. The test pieces shall be welded in accordance with the nominal angles of the positions according to EN ISO The range of approval for each type of test is given in the relevant sub-clauses and tables.
In these tables the range of approval is indicated in the same horizontal line. A change of process requires a new approval test. However, it is possible for a welder to be approved for more than one welding process by a single test or by two separate approval tests to be used to cover a multi-process joint. For example in a case where approval is required for a single-side butt joint with the root to be welded by TIG without backing and to be filled by MIGthe welder can be approved by either of the following routes: In cases where the majority of production work is fillet welding, the welder shall be approved also by an appropriate fillet welding test; e approval for butt welds in pipes without backing includes approval for branch connections within the same range of approval as in tables 3 to 5.
For a branch weld the range of approval is based on the diameter of the branch; f in cases where the majority of production work is predominantly branch welding or involves a complex branch connection, the welder should receive special training. In some cases a welder approval test on a branch connection can be necessary. For any copper alloy not covered by any of the copper groups the welder shall carry out an approval test, which only approves for that copper.
An approval test made on wrought material groups gives approval for cast material and a mixture of cast and wrought material in the same material group see 5. The welding position H-L for pipes approves for all pipe angles in production work.
The test pieces shall be marked with the identification of the examiner and the welder before welding starts. The examiner or examining body can stop the test if the welding conditions are not correct or if it appears that the welder does not have the technical competence to comply to the requirements of this standard, e.
BS EN ISO 9606-3:1999
Dimensions in millimetres Figure 1: Dimensions of test piece for fillet weld s on plate Dimensions in millimetres Figure 3: Dimensions of test piece for a fillet weld on pipe 7. The following conditions shall apply: The approval of the examiner or test body shall be obtained.
When required, visual examination can be supplemented by penetrant see EN or other test methods see table 6. The macroscopic specimen shall be prepared and etched on one side to clearly reveal the weld see ENpolishing is not required. In addition to radiography, two bend tests, one face, one root see EN or two fracture tests, one face, one root see EN shall always be applied to butt welds.
Prior to mechanical testing, backing strips, where used, shall be removed. The test piece can be sectioned by mechanical means discarding the first and the last 25 mm of the test piece at the end of the plates figures 5 and 6. Test methods Test method Butt weld plate Butt weld pipe Fillet weld Visual mandatory mandatory mandatory Radiography mandatory mandatory not mandatory Bend mandatory 1 mandatory 1 not mandatory Fracture mandatory 1 mandatory 1 mandatory 2 Macroscopic not mandatory not mandatory not mandatory 2 Penetrant not mandatory not mandatory not mandatory 1 Bend or fracture test shall be used, but not both test methods.
If any special tests are to be carried out because of the characteristics of particular welding processes, materials or dissimilar alloys, these shall be defined prior to carrying out the welder’s test.
Special tests do not have any range of approval, outside the range of tolerances for the test carried out. In addition, the requirements for mechanical tests are indicated.
When fracture testing is used, it shall be carried out in accordance with EN One root fracture test specimen and one face fracture test specimen shall be tested. The specimen preparation, types of notch profiles and methods of fracture shall be in accordance with EN When transverse bend testing is used, one root bend test specimen and one face bend test specimen shall be tested in accordance with EN Preparation and fracture testing of test specimens for a butt weld in plate 7.
Each test specimen shall be positioned for breaking as shown in figure 6b, and examined after fracture. When macroscopic examination is used, at least four test specimens shall be taken equally spaced in the inspection length. Macroscopic tests shall be carried out in accordance with EN Preparation and fracture testing of test specimens for a fillet weld on plate 7. If the circumference is less than mm, additional weld test pieces will be required.
When radiographic testing is used, the inspection length of the weld see figure 7 a and 7 b in the test piece shall be radiographed in the as-welded condition in accordance with EN using class B technique. Test specimen preparation, types of notch profiles and methods of fracture shall be in accordance with EN When transverse bend testing is used, it shall be carried out in accordance with EN The number of fracture or transverse bend test specimens depends on the welding position.
For welding position PA or PC, one root and one face bend test specimen shall be tested see figure 7 a. For all other welding positions, two root and two face bend test specimens shall be tested see figure 7 b. For one root fracture or one root transverse bend or one side bend test specimen Position 2: Each position one face fracture or one face transverse bend or one side bend test specimen b Sectioning into at least four test specimens c Inspection length of the test specimen NOTE Figure c shows the notch profile q d Fracture testing, face side e Fracture testing, root side Figure 7: Preparation and fracture testing of test specimens for a fillet weld on pipe When macroscopic examination in accordance with EN is used, at least four test specimens shall be taken equally spaced around the pipe.
BS EN ISO – Approval testing of welders. Fusion welding. Copper and copper alloys
A full explanation of these imperfections is given in EN The acceptance requirements for imperfections found by test methods according to this standard shall, unless otherwise specified, be assessed following EN A welder is approved if the imperfections in the test piece are within the specified limits of level B in ENexcept for imperfection types as follows: If the imperfections in the welder’s test piece exceed the permitted maximum specified, then the welder shall not be approved. Reference should also be made to the corresponding acceptance criteria for non-destructive examination.
Specified procedures shall be used for all destructive and non-destructive examinations. If it is established that failure is attributed to the welder’s lack of skill, the welder shall be regarded as incapable of complying with the requirements of this standard without further training before re-testing.
This date can be different to the date of issue marked on the certificate.