BS 4570-1985 Specification for fusion welding of steel castings《钢铸件的熔焊技术规范》.pdf
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1、BRITISH STANDARD BS4570:1985 Specification for Fusion welding of steel castings UDC621.791.5:669.14414BS4570:1985 This British Standard, having been prepared under the directionof the Welding Standards Committee, was published under the authority ofthe Board of BSI and comes intoeffect on 30 Septemb
2、er1985 BSI 01-2000 Part1 first published February1970 Part2 first published August1972 First revision (combined) The following BSI references relate to the work on this standard: Committee reference WEE/35 Draft for comment83/70144 DC ISBN 0 580 14551 4 Committees responsible for this British Standa
3、rd The preparation of this British Standard was entrusted by the Welding Standards Committee (WEE/-) to Technical CommitteeWEE/35, upon which the following bodies were represented: Associated Offices Technical Committee BCIRA British Foundry Association British Gas Corporation Electricity Supply Ind
4、ustry in England and Wales Engineering Equipment and Materials Users Association Institute of British Foundrymen Institution of Mechanical Engineers Ministry of Defence Power Generation Association (BEAMA Ltd) Steel Casting Research and Trade Association Welding Institute Welding Manufacturers Assoc
5、iation (BEAMA Ltd) Amendments issued since publication Amd. No. Date of issue CommentsBS4570:1985 BSI 01-2000 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Information and requirements to be agreed and to be documented 1 3 Castings and welding procedures 2 4 Weldi
6、ng consumables 2 5 Equipment 3 6 Preparation for welding 3 7 Backing materials 3 8 Assembly (fabrication welding) 9 9 Distortion 10 10 Arc strikes 10 11 Inter-run cleaning 10 12 Pre-heating 10 13 Cooling after welding 10 14 Post-weld heat treatment 10 15 Temperature measurement 11 16 Dressing 11 17
7、Inspection of completed welds 12 18 Rectification of faulty welds 12 19 Record of location of welds 12 20 Procedure approval 12 21 Welder approval 22 Appendix A Record of approval for welding procedure 26 Appendix B Manufacturers record of welder approval test 29 Figure 1 Typical joint preparations
8、for welding from one side 8 Figure 2 Typical joint preparations for welding from both sides 9 Figure 3 Typical gouged cavities 9 Figure 4 Guidance on distributed porosity or inclusions as seen in radiograph 19 Figure 5 Location of test specimens for welds in plate for procedure approval 20 Figure 6
9、Location of test specimens for welds in pipe for procedure approval 21 Figure 7 Welding positions 25 Table 1 Steels, weld preparation, electrodes and filler wires, pre-heating and post-weld heat treatment 4 Table 2 Grouping of steels for welding procedure approval 13 Table 3 Procedure approval thick
10、ness ranges 16 Table 4 Test specimens from procedure approval test joints 17 Table 5 Acceptance levels for welding procedure and welder approval tests 18 Table 6 Grouping of steels for welder approval 23 Table 7 Welder approval: positions approved 24 Publications referred to Inside back coverBS4570:
11、1985 ii BSI 01-2000 Foreword This British Standard has been prepared under the direction of the Welding Standards Committee. It is a combined revision of BS4570-1:1970 and BS4570-2:1972 which are withdrawn. There was much common ground between these two Parts and in this revision it was felt prefera
12、ble to produce a single standard, with attention drawn to where differing requirements apply according to the purpose of welding. This revision incorporates changes resulting from experience in the use of the previous Parts and from technical developments in the welding of steel castings. Steel cast
13、ings may require welding to make them satisfactory for their intended service, and this has long been accepted as part of the normal production process. The procedures in this standard can be specified to ensure good welding practice during the production, repair, rectification and fabrication of st
14、eel castings. In fabrication, the use of welding has to be taken into account at the design and/or foundry stages. Fabrication welding principles require that proven welding procedures are used and although full details on procedure testing are included, the requirements have been kept to the minimu
15、m necessary to ensure that sound joints can be produced. Where an established fabricator can offer documentary evidence as proof of possessing satisfactory welding procedures without the need for approval, testing need not be carried out. Also, when more comprehensive testing than was done for an al
16、ready approved procedure has to be carried out, it is necessary to perform only those specific additional tests and not the entire range of tests required by this standard. Unlike fabrication welding, in the case of repair and rectification welding there are no “standard” types of weld and each loca
17、tion where welding is required has to be considered in respect of its particular characteristics. It is for this reason that in some clauses of this standard guidance is given to assist in determining the action required. Similarly, no acceptance levels for completed welds are specified and these sh
18、ould be the subject of agreement between the contracting parties. Care is needed in the interpretation of the results of non-destructive testing, bearing in mind that allowable defects may be present in the castings in the vicinity of the welded joint. It has been assumed in the drafting of this sta
19、ndard that the execution of its provisions is entrusted to appropriately qualified and experienced people. At the time of publication of this British Standard, no corresponding International Standard exists. In the preparation of this revision much assistance has been derived from the information in
20、 the document “Recommended procedure for the fusion welding of steel castings” published by the Steel Castings Research and Trade Association. Inspecting authority. The term “inspecting authority” refers to that competent independent body or association which verifies compliance with this standard.
21、A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises
22、a front cover, an inside front cover, pagesi andii, pages1 to30, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS4570:1985 BSI 01-2000 1 1 Sc
23、ope This British Standard specifies requirements for the fusion welding of steel castings when it is used: a) to rectify a casting as part of the normal production process; b) to rectify a casting that has been in service; c) for the joining together of steel castings by fusion welding, where the su
24、b-sections of the final fabrication are designed for that purpose or when welding is introduced at the foundry planning stage. This standard covers the manual metal-arc, gas-shielded, self-shielded and submerged-arc welding of the materials given in Table 1, but additional guidance for other process
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