AWS D14.4:2019 pdf download

AWS D14.4:2019 pdf download.Specifcation for the Design of Welded Joints in Machinery and Equipment
1. General Requirements
1.1 Scope. This specification establishes design, quality, and inspection requirements for carbon and low-alloy steel welded connections in machinery and equipment. It addresses topics including weld joint design, workmanship, quality acceptance criteria, non-destructive inspection methods (visual, radiographic, ultrasonic, magnetic particle, and liquid penetrant), repair of weld defects, and heat treatment. 1.2 Limitations. This specification does not dictate load determination, design assumptions, safety factors, or calculation methods. It is not the intent of this specification to restrict the use of other proven welding methods and procedures that are not mentioned herein, which achieve acceptable results as determined by the Engineer. In the case where this specification is used between the Owner and Manufacturer, the use of other proven welding methods and procedures that are not mentioned herein shall be agreed to in writing by the Owner and Manufacturer. 1.3 Units of Measurement. This standard makes use of both U.S. Customary Units and the International System of Units (SI). The latter are shown within brackets [ ] or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore, each system must be used independently. 1.4 Safety. Safety and health issues and concerns are beyond the scope of this standard; some safety and health information is provided, but such issues are not fully addressed herein. Safety and health information is available from the following sources: American Welding Society: (1) ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes (2) AWS Safety and Health Fact Sheets (3) Other safety and health information on the AWS website Material or Equipment Manufacturers: (1) Safety Data Sheets supplied by materials manufacturers (2) Operating Manuals supplied by equipment manufacturers Applicable Regulatory Agencies Work performed in accordance with this standard may involve the use of materials that have been deemed hazardous, and may involve operations or equipment that may cause injury or death. This standard does not purport to address all safety and health risks that may be encountered. The user of this standard should establish an appropriate safety program to address such risks as well as to meet applicable regulatory requirements. ANSI Z49.1 should be considered when devel- oping the safety program. 1.5 International Usage. This specification includes terms and symbols that are more commonly used outside of the North American market. These terms are shown in brackets [ ] when used in the specification. 1.6 Engineer Responsibility. 1.6.1 The ‘Engineer’ in this document shall have specific technical expertise in welding engineering or design engineering; the expertise is not limited to these two areas of engineering. Unless otherwise specified in the contract documents, the Manufacturer shall determine the responsible technical authority when the term Engineer is used (i.e. Welding Engineer or Design Engineer). 1.6.1.1 Welding Engineer. The technical authority typically responsible for developing Welding Procedure Specifications (WPS), Procedure Qualification Records (PQR) and Performance Qualification Test Records (PQTR). The Welding Engineer might also have expertise in weld process selection; welding metallurgy and weld filler metal selection; weld joint design and weld sizing; weld fixture design and weld robot programing; welding inspection and weld defect/failure root cause analysis. Qualifications for a welding engineer shall meet one of the following criteria: (1) An AWS Certified Welding Engineer in conformance with the provisions of AWS B5.16 Specification for the Qualification of Welding Engineers or, (2) IIW International Welding Engineer (IWE), (3) Professional Engineer – Welding, (4) An individual who by degree, training, or experience is qualified in welding engineering disciplines. 1.6.1.2 Design Engineer. The technical authority typically responsible for developing equipment configuration; analyzing stress levels, finite element analysis, and strain gage data to mitigate stress hot spots; choosing steel material type and thickness; determining weld joint type and weld size; and evaluating cyclic loading and fatigue life. The Design Engineer might also provide judgments on weld defect criticality and welding inspection requirements. Qualification for a design engineer shall meet one of the following criteria: (1) Professional or Chartered Engineer – Mechanical, Civil, Structural, Agricultural, or (2) An individual who by degree, training, or experience is qualified in design of structures.