BS%207670-2-1997_焊接螺母标准

BRITISH STANDARD

BS 7670: Part 2 z 1997

Steel nuts and bolts for resistanee projeetion weldingPart 2. Specification for welding of weld nuts and weld bolts

ICS21.0ti0. 21.0ti0.20: 160. 10: 25. l0

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BS7670:Part2z1997

Committees responsible for this British StandardThe preparation of this British Standard was entrusted by Technical Committee WEE/29,Resistancewelding, upon which the following bodies were represented:

British Iron and Steel Producers'Association Railway Industry Association Society of Motor Manufacturers and TbadersLimited Welding Institute IIW-UK Briefing Group III Co-opted

This British Standarrl, having been prepared under the direction of thc lingheering Sector Board, wit-s published under the authority of the Standards Board and conres into effect on 15 March 1997

o BSr1997

Amendments issued since publicationAmd. No. Text affected

The following BSI references relate to the work on this standard: Committee reference W EE/29 Draft for comment 95/703043DC

ISBN 0 580 25550 6

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BS7670:Part2:L997

ContentsPage Inside front cover ii I 1 I I I 2 2 2 2 2 4 4 4 5 5t)

Committees responsible Foreword Specification I 2 3 4 5 6 7 8 I f0 l1 12 13 A B C I 2 B.l 8.2 Scope References Definitions Steel Information

and requirements to be agreed and to be documented

Surface conditions Edge conditions and form of component Shape and dimensions Materials for electrode assemblv Design of electrode assembly Weld assessment Routine inspection of welded components Reclamation (informative) (informative) Recommendations for appropriate welding equipment

Annexes Tirpical welding conditions (informative)Weldingprocedureinformation Weld nut size relative to sheet thiclmess[rpical torque va]ues for weld nuts Tipical welding condition for square weld nuts Tlpical wcld conditions for weld bolts

Tables

4 4b

o

Figures I Positioning of square and hexagonal nuts prior to welding 2 Location of weld boltList of references

.)r)

Inside back cover

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8S7670:Part2:1997

ForewordThis Part of BS 7670 has been prepared by Technical Committee WEE/Z9. It specifies weld nuts and weld bolts for resistance welding processes. It supersedes BS 2996: 1958 which is withdrawn. This Part should be used in conjunction with Part 1: Di,men"sions and propa'ti,es which specifies weld bolts and weld nuts. In a standard of this type, which covers a wide range of engineering applications, it is not practicable

to set out specific requirements for equipment or welding conditions to be used. llowever, guidance on these subjects is given in annexes A to C. Similarly, it is not possible to specify acceptance requirements.

Compliance with a British from legal obligations.

Standard

does not of itself

confer immunity

Summary of pages This document comprisesa front cover, an inside front cover,pagesi and ii, pages 1 to 6, an inside back cover and a back cover.

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o BSI 1997Not for Resale

8S7670:Part2:1997

SpecifieationI ScopeThis British Standard specifies projection welding of weld nuts and weld bolts singly to uncoated and coated steel sheet from 0.5 mm to 5.0 mm thick. Annex A gives recommendations for appropriate welding equipment and annex B outlines typical welding conditions. NOTE1. It is emphasized this type of weld is loadedin that compression only.The purposeof the weld is to preventthe fastenerfrom rotating during assembly disassembly a or of fabrication.It is not intendedas a structuralweld. This standard specifies weld nuts and weld bolts, the design, dimensions and materials of which are detailed in Part 1 of this standard. Annular projections are not included. In addition to the definitive requirements specified throughout the standard, the documented items detailed in clause 5 shall be satisfied before a claim of compliance with the standard can be made and verified.

Coated material shall conform to the relevant requirements and chemical composition specified in BS EN TOI42, 6536,BS 6582,BS EN IOI52, BS BS EN 10215, and BS EN 10147.NOTE 1. The recommended application of hole diarneter and sheet thiclcress is given in table l. NOTE 2. For a fixed fastener diameter, welding becomes more difficult the larger the sheet thiclcress. Greater care should be taken when welding coated steels.

5 Information and requirements agreed and to be documented 5.1 Information to be supplied by the purchaser

to be

2 Referenees2.1 Normative references This Part of BS 7670 incorporates, by dated or undated reference, provisions from other publications. These normative references are made at the appropriate places in the text and the cited publications are listed on the inside back cover. For dated references, only the edition cited applies; any subsequent amendments to or revisions of the cited publication apply to this Part of BS 7670 only when incorporated in the reference by amendment or revision. For undated references, the latest edition of the cited publication applies, together with any amendments. 2.2 lnfotmative references

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