Electric resistance welding

About: Electric resistance welding is a research topic. Over the lifetime, 16761 publications have been published within this topic receiving 154851 citations.

A Comparative Study on Direct and Pulsed Current Gas Tungsten Arc Welding of Alloy 617

Abstract: the aim of this article is to evaluate the mechanical and microstructure properties of Inconel 617 weldments produced by direct current electrode negative (DCEN) gas tungsten arc welding (GTAW) and pulse current GTAW. In this regard, the micro structural examinations, impact test and hardness test were performed. The results indicated that the joints produced by direct mode GTAW exhibit poor mechanical properties due to presence of coarse grains and dendrites. Grain refining in pulse current GTAW is reason of higher toughness and impact energy than DCEN GTAW. Further investigations showed that the epitaxial growth is existed in both modes that can strongly affect the mechanical behavior of the joints in heat affected zone (HAZ).

Influence of Pin Profile on Quality of Friction Stir Lap Welds in Carbon Fiber Reinforced Polypropylene Composite

Abstract: In recent years, interest on friction stir welding has grown more since such a joining technique allows welding of light weight alloys like aluminum and its alloys which are difficult to weld or even unweldable with the traditional fusion welding processes. This process can also be one of the joining processes considered for welding polymer matrix composites such as polypropylene composites which find a number of applications in different industries. This paper presents the effect of tool pin profile on surface appearance and tensile shear strength of friction stir lap welds in carbon fiber reinforced poly- propylene composites with 4 mm thickness. Four high speed steel tools with different pinprofiles of threaded cylindrical, threaded cylindrical-conical, simple cylindrical-conical and threaded conical were employed for this study. Using these tools, lap welds were made under similar conditions of tool rotational speed, welding speed and tilt angle. Specimens were prepared for tensile shear testing. The tensile shear test results showed that the threaded cylindrical-conical tool produced a weld with better surface appearance and higher tensile shear strength.

An experimental study on friction welding of medium carbon and austenitic stainless steel components

Abstract: In the presented study, AISI 1040 medium carbon steel and AISI 304 austenitic stainless steel parts were joined by friction welding. The welding process was carried out under optimized conditions using statistical approach. Tension tests were applied to welded parts to obtain the strength of the joints. Fatigue properties were additionally obtained experimentally under fluctuated tensile loads. Finally, notch impact tests were applied to the joints. Microstructures using microphotographs were examined in the heat affected zone of welded parts. Hardness variations in welding zone were also obtained. Experimental results were compared with those of previous studies.

Multi-Response Optimization of Friction-Stir-Welded AA1100 Aluminum Alloy Joints

Abstract: AA1100 aluminum alloy has gathered wide acceptance in the fabrication of light weight structures. Friction stir welding process (FSW) is an emerging solid state joining process in which the material that is being welded does not melt and recast. The process and tool parameters of FSW play a major role in deciding the joint characteristics. In this research, the relationships between the FSW parameters (rotational speed, welding speed, axial force, shoulder diameter, pin diameter, and tool hardness) and the responses (tensile strength, hardness, and corrosion rate) were established. The optimal welding conditions to maximize the tensile strength and minimize the corrosion rate were identified for AA1100 aluminum alloy and reported here.

Engineering Design with Polymers and Composites

Abstract: Introduction Introduction History of Polymers History of Composites Examples of Polymers and Composites in Use Definitions and Classifications Identification of Plastics Raw Materials and Production of Polymers Chemical Structures Glass Transition and Melting Temperatures Mechanical Properties of Polymers Introduction Tensile Properties Static Failure Theories Creep Properties Relaxation Properties Dynamic Properties Large Strain Definitions Analysis of Damping Time Hardening Creep Isochronous Creep Curves Viscoelastic Behavior of Polymers Mechanical Models Mathematical Models The Maxwell Fluid The Kelvin Solid The Four-Parameter Model The Boltzmann Superposition Principle Advanced Viscoelastic Models The Viscoelastic Correspondence Principle The Time-Temperature Equivalence Principle Creep and Fatigue Failure Creep Failure under Tension Creep Failure under Compression Fatigue of Polymers Notch Sensitivity under Fatigue Creep Buckling of Shells Impact Strength and Fracture Toughness Impact Strength Fracture Toughness Analysis of the Charpy and Izod Impact Tests using Fracture Mechanics Analysis of Impact Specimens at the Nanoscale Selection of Polymers for Design Applications Introduction Basic Material Properties Performance Parameters Loading Conditions and Geometrical Configurations Availability of Materials A Rectangular Beam in Bending Weighting-Factor Analysis Thermal Gradient through a Beam Rating Factors for Various Loading Requirements Design Optimization Computer Database Design Selection Procedure Design Applications of Some Polymers Phenolic Resins with Fillers Polycarbonate Example Design with PC: Fan Impeller Blade Example Design with PC: Snap/Fit Design Example Design of PVC Pipe Design with Fluorocarbon Resins Composite Material Mechanics Introduction Composite Material Nomenclature and Definitions Analysis of Composite Structures Experimental Determination of Engineering Elastic Constants Composite Laminate Failure Strength Properties and Failure Theories Stiffness of Laminated Composites Thermal Stresses Summary Polymer Processing Extrusion Manufacture of PVC Pipe by Extrusion Injection Molding Thermoforming Blow Molding Adhesion of Polymers and Composites Introduction Fundamentals of Adhesion Adhesives Enhancement of Adhesion in Composites Curing of Adhesives Summary Polymer Fusing and Other Assembly Techniques Introduction Heated Tool Welding Ultrasonic Welding Friction Welding Laser Welding Hot Gas Resistance Welding Induction Welding Mechanical Fastener Connections Tribology of Polymers and Composites Introduction Contact Mechanics Surface Topography Friction Wear PV Limit Rolling and Sliding Modification of Polymers for Friction and Wear Performance Composites Wear of Composites Heat Generation in Sliding Polymer Systems Special Considerations Simulative Laboratory Testing Damping and Isolation with Polymers and Composites Introduction Relevance of the Thermomechanical Spectrum Damping Methods of Material Modification Materials for Damping and Isolation Fundamentals of Vibration Damping and Isolation Role of Dampers Damping Layers Rapid Prototyping with Polymers Introduction Rapid Product Development, Tooling, and Manufacture RP Techniques RP Materials Applications Piezoelectric Polymers Introduction Piezoelectric Strain Behavior Piezoelectric Material Properties Hysteresis Composites Appendix A: Conversion Factors Appendix B: Area Moments of Inertia Appendix C: Beam Reactions and Displacements Appendix D: Laminate MATLAB(R) or Octave Code Appendix E: Sample Input/Output for Laminate Program Appendix F: Composite Materials Properties Appendix G: Thermal and Electrical Properties Index Homework Problems and References appear at the end of each chapter.