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AWS D8.8M:2014 pdf free download
AWS D8.8M:2014 pdf free download.Specification for Automotive Weld Quality-Arc Welding of Steel.
4. General Provisions
4.1.1 This specification provides the minimum acceptable quality requirements for arc and hybrid arc welding of coated and uncoated materials for various types of automotive and light truck components.
4.1.2 The postweld acceptance requirements contained in this document are mandatory when this specification is referenced on a product drawing, or in a contract. A product not conforming to the acceptance criteria contained in this specification shall be reworked. scrapped. or accepted by concession.
4.1.3 Products shipped and not conforming may be rejected by the customer, reworked by the customer, or scrapped.
4J.4 Any requirements deviating from the limits of this specification shall be designated on the engineering documents.
4.1.5 Should any conflict occur between limits specified herein and those specified on the engineering documents. the latter have precedence.
4.2 Welding Proccsscs. This specification covers the quality requirements for welds made by the shielded metal arc welding (SMAW), gas metal arc welding (GMAW), flux cored arc welding (FCAW). plasma arc welding (PAW), gas tungsten arc welding (GTAW). and hybrid arc welding processes.
4.2.1 Welding Procedures. Welding procedures list those variables (and their limits) which influence the quality of the weld. The welding process and weld procedures shall be developed and documented to demonstrate the capability to reliably produce welds on production parts over a specified range of variables. Information pertaining to welding procedure qualification may be found in AWS B2.l/B2.lM Specification for Welding Procedure and Performance Qualificarioti, other AWS application codes, and OEM standards.
4.2.2 Filler Metals. Filler metals shall conform to the requirements of the appropriate AWS filler metal specification. Filler metals used to weld zinc coated steel shall be evaluated for their compatibility with zinc coatings.
4.3.1 Surface Condition of Steel
18.104.22.168 The surface of the steel part in the weld area, at the time of welding, should be free from scale, rust, paint, lubricants, and other contaminants adversely affecting the weld quality.
22.214.171.124 Lubricants for high-pressure hydroforming applications tend to be more difficult to remove. Consult with the lubricant supplier for the recommended lubricant removal process.
4.3.2 ,Joint Fit
126.96.36.199 To ensure proper joint fit, all parts shall be located for maximum weld effectiveness. i.e., minimum gap and repeatable location.
188.8.131.52 To ensure consistent weld quality in fillet welds, the joint gap should not exceed 0.3T1 where T1 is the thickness of the thinnest part. Additionally, the gap should not exceed the diameter of the filler wire. This should be true for all thicknesses in the range from 2 mm to 5 mm for single arc processes. For tandem arc welding, the range from 2 mm to 5 mm material thickness would allow a maximum gap of 2.0 mm. NOTF: This size gap only applies for we!diig done in ihe hal or horizonial positions. For lap penetration joints with high power density processes such as hybrid laser, the joint gap should not exceed 0.2 mm. The specific range of gap values listed above is dependent on the welding process and joint configuration. Larger gaps than specified can adversely affect structural performance or fatigue life.
184.108.40.206 On lap joints. the edge trim (land) shall lcavc adequate stock so as to not restrict the ability to make a I T-leg (T1 = thickness of thinnest member) fillet weld.
4.4 Weld Identification and Inspection. The use of the latest edition of AWS A2.4 Standard Symbols for Welding. Brazing, and Nondesiruciii’e £ra,,,inaiion shall be used for indicating all welding and inspection requirements on the engineering drawing. All weld symbols on the engineering document shall be approved by the engineering authority. Special conditions shall be fully explained by added notes or details.AWS D8.8M:2014 pdf free download.
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