1、EUROPEENGINEERINGSTANDARDSGeneral Specification GME17297Quality Guideline for Drawn Arc Fasteners Copyright 2015 General Motors Company All Rights ReservedMarch 2015 Page 1 of 41 IntroductionNote: Nothing in this standard supercedes applicable laws and regulations.Note: In the event of conflict betw
2、een the English and domestic language, the English language shall takeprecedence.1.1 Purpose. This standard determines the quality guideline for standard steel drawn arc fasteners.1.2 Applicability. The requirements of this document become mandatory for all weld fasteners. Supplierscompliance with t
3、he requirements of this quality guideline is the basis for the technical release. The specificationsshall be met in all GME regions.1.3 Remarks. For clarification of this standard or editorial comments, contact GME Material & Presses andJoining Technology department.2 ReferencesNote: Only the latest
4、 approved standards are applicable unless otherwise specified.2.1 External Standards/Specifications.None2.2 GM Standards/Specifications.GMW3059 GMW140562.3 Additional References.WS-5JWS-1JGWS-7, additional requirements for large welding areas necessary for brackets (extended weld time)3 GeneralThe m
5、echanical and material characteristic of the drawn arc fastener have a great influence on the processstability and process reliability.The manufacturer of the fastener shall provide and guarantee a constant high fastener quality.Therefore a quality management system shall be established to ensure th
6、e constant high quality of the products.The batch of fastener is released as soon as the raw material test and the final product test has successfullycompleted, the process capability is given and the documentation is available.4 Product Requirements4.1 Material and Geometry of Fasteners. Following
7、fastener characteristics are essential to meet the processrequirements (see paragraph 2):x Coating (Zinc-Plating) according to specification within the given tolerances (but 12 m maximum)x Material according to specification and drawing within the given tolerancesx Fastener shall be vibratory grinde
8、dx Oil or grease free surfaces under consideration of corrosion protection.GM EUROPE ENGINEERING STANDARDS GME17297 Copyright 2015 General Motors Company All Rights ReservedMarch 2015 Page 2 of 4x Weld process capability4.2 Quality Assurance. A quality test of raw material and fasteners (made of it)
9、 shall be performed to ensurethe constant process capability of the fastener. Quality tests include chemical analysis (e.g. carbon content 0.25 % by mass), micro structure, hardness etc. and shall be according to specifications and drawings.This test shall be repeated as soon as a new raw material b
10、atch is used.4.2.1 Raw Material Testing. Before starting of fastener manufacturing each raw material batch shall be testedaccording to paragraph 5.Fastener definition:x Defined Sizex Free of oil and greasex DeburredFurther process steps of the fastener production are only allowed if the target of we
11、lding quality has been fulfilledby using original reference welding parameters (for raw material probe).4.2.2 Final Product Testing. After surface treatment (coating and barrel finishing) the fastener batch shall betested according to paragraph 5.Faster definition:x Made in tool for seriesx Barrel f
12、inishedx Zinc PlatingFurther process steps of the fastener production are only allowed if the target of welding quality has been fulfilledby using original reference welding parameters (for final product testing) and the quality is documented.x 50 subsequent fasteners shall be welded.x Each individu
13、al weld must comply with the reference weld quality to get a final approval. A minimum fusion /fusion length of 90 % is requested.5 Weld Test Details5.1 Specification of the Base Sheet Material. The material should be uncoated soft steel e.g. GMW2M-ST-S-CR3-UNCOATED-U (recommendation).The sheet gaug
14、e shall be taken from Tables 1 and 2.Table 1: BracketsMaterial Thickness of Base Sheetin mmMaterial Thickness of Bracketin mm0.8 1.001.0 1.251.25 1.501.5 2.001.5 2.50Table 2: StudsMaterial Thickness of Base Sheetin mm Studs0.8 All5.2 Weld Test. According to:x WS-5Jx GMW14056GM EUROPE ENGINEERING STA
15、NDARDS GME17297 Copyright 2015 General Motors Company All Rights ReservedMarch 2015 Page 3 of 46 Documentationx Datex Material description of bracket, stud or nutx Material description of base materialx Coating informationx Weld parameters (Current, time, lift height, energy, arc voltage, gas) (see
16、Figure 1)x Dynamic current curve of complete weld (see Figure 1)x Dynamic voltage curve of complete weld (see Figure 1)x Confirmation of used reference parametersx Result of destructive test (50 subsequent welds)Figure 1: Reference Curve Weld Current, Lift Height and Arc Voltage (example)7 Packaging
17、 and ShipmentThe fasteners will be used in fully automated welding equipment. Therefore packaging requires highrequirements with regard to technical cleanliness.The packaging material shall be a low-abrasion material e.g. PE bags.The fasteners shall be 100 % controlled and dustproof packed.8 Fastene
18、r Validation in PlantIn case that a fastener is used the first time at GM, the supplier of the fastener shall provide fasteners for theneed of a 3 shift serial production.The fastener is going to be released if the quality chain is documented and the plant validation result was positive.9 Notes9.1 G
19、lossary.Fastener: A fastener can be a stud, nut or bracket (see Figure 2).Weld CurrentLift HeightArc VoltageGM EUROPE ENGINEERING STANDARDS GME17297 Copyright 2015 General Motors Company All Rights ReservedMarch 2015 Page 4 of 4Figure 2: Fastener1 Fastener2 Base sheet metal3 Welding areaRaw Material
20、 Test: The raw material test is a weldability test of not coated, deburred and oil- and grease freefasters. It proves the weld qualification of the raw material.Reference Welding Parameters: The reference welding parameters is a set of parameter which has to bespecified at the very first raw materia
21、l batch and a second for the final fasteners made of the batch. This fixedset of parameter shall be used for all subsequent tests.Reference Weld Quality: The reference weld quality defines a weld size with 100 % fusion and no undesirableattributes. This shall be achieved with the reference welding p
22、arameters.Process Capability: Each material batch and the fasteners made from it needs to be investigated in respect toprocess capability. The material batch and fasteners shall be welded with fixed reference welding parametersand has to achieve a defined welding quality.9.2 Acronyms, Abbreviations,
23、 and Symbols. Not applicable.10 Additional Paragraphs10.1 All parts or systems supplied to this standard must comply with the requirements of GMW3059, Restrictedand Reportable Substances for Parts.11 Coding SystemThis standard shall be referenced in other documents, drawings, etc., as follows:GME1729712 Release and RevisionsThis standard was first approved and released in March 2015.Issue Publication Date Description (Organization)1 MAR 2015 Initial publication.123
