MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY FOR HIGH QUALITY TRAINING CAPSTONE PROJECT ELECTRONICS AND TELECOMMUNICATIONS ENGINEERING TECHNOLOGY EXPERIMENTAL SURFACE TREATMENT USING ARC WELDING – APPLICATION FOR FLAT PRODUCTS LECTURER: PhD PHẠM SƠN MINH STUDENT: NGUYỄN VĂN TẤN TRẦN NGUYỄN ANH TÀI NGUYỄN TUẤN KIỆT SKL010888 Ho Chi Minh City, 2023 MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY FOR HIGH QUALITY TRAINING MECHANICAL ENGINEERING TECHNOLOGY GRADUATION THESIS EXPERIMENTAL SURFACE TREATMENT USING ARC WELDING - APPLICATION FOR FLAT PRODUCTS ADVISER: Associate Professor, PhD PHẠM SƠN MINH STUDENTS: NGUYỄN VĂN TẤN 18144050 TRẦN NGUYỄN ANH TÀI 19144333 NGUYỄN TUẤN KIỆT 19144088 Ho Chi Minh City, July 2023 HCM University of Technology and Education SOCICALIST REPUBLIC OF VIETNAMĐộc FACULTY FOR HIGH QUALITY TRAINING Independent - Freedom – Happiness GRADUATION THESIS MISSIONS Semester 2/ Year: 2023 Adviser: Associate Professor, PhD. Phạm Sơn Minh Students: Nguyễn Văn Tấn MSSV: 18144050 TEL: 0857252733 Trần Nguyễn Anh Tài MSSV: 19144333 TEL:0968546213 Nguyễn Tuấn Kiệt MSSV: 19144088 TEL: 0948920139 1. Name of topic: Experimental Surface Treatment Using Arc Welding - Application for Flat Products 2. Initial Data and Documents: - Distance from stungsten to surface - Velocity - Alternating current - Shielding gas 3.
Main Content of the Project: Improving surface hardness, microhardness, and microstructure alterations. Expected Deliverables - Realistic product model - Analytical report 5. Date assigned to the project: March 15, 2023 6. The deadline for project submission: July 15, 2023 7.
Presentation language: The report: English Vietnamese Protection presentation: English Vietnamese HEAD OF TRSENIOR MANAGER ADVISER DEPARTMENT (Sign, write full name) (Sign, write full name) (Sign, write full name) 2 HCM University of Technology and Education SOCIALIST REPUBLIC VIETNAM FALCULTY FOR HIGH QUALITY TRAINING Independent – Freedom – Happiness COMMENTS FORGRADUATION PROJECT (For adviser) Full name of the students: 1. Nguyễn Văn Tấn MSSV: 18144050 2. Trần Nguyễn Anh Tài MSSV: 19144333 3. Nguyễn Tuấn Kiệt MSSV: 19144088 Project name : Experimental Surface Treatment Using Arc Welding - Application for Flat Products Major: Mechanical Engineering Technology Adviser: Associate Professor, PhD.
Phạm Sơn Minh COMMENTS 1. Comments on the student's spirit and working attitude:. Evaluation of the execution results of the Graduation Thesis: 2. Structure, how to present the graduation thesis:.
Content of the thesis: (Theoretical foundation, practicality, and applicability of the thesis, potential areas for further research). Rating: No Reviews section Maximum score Points earned 1 Graduation project form and 30 structure Correct format with full form and 10 content of entries Objectives, tasks, overview of the topic 10 The urgency of the subject 10 2 Contents of Graduation Project 50 Ability to apply knowledge of mathematics, science and engineering, 5 social sciences. Ability to perform / analyze / synthesize 10 / evaluate The ability to design and manufacture a system, component, or process that 15 meets a given requirement with realistic constraints. Ability to improve and develop 15 Ability to use technical tools, specialized 5 software.
4 3 Evaluate the applicability of the topic 10 4 Specific products of the Graduation 10 Project Total score 100 4. Conclusion Permission to present graduation project Graduation project present is not allowed Ho Chi Minh City, July 2023 ADVISER (Sign and write your first and last name) 5 THANK YOU NOTE We would like to express our sincere gratitude to the teachers of Ho Chi Minh City University of Technology and Education who have supported and assisted us throughout the process of completing our graduation project on the topic "Experimental Surface Tempering Treatment Using Energy from Arc Welding - Application for Flat Products." First and foremost, we want to express our appreciation to the teachers, providing the necessary knowledge and skills to us, enabling us to accomplish this project. This knowledge not only helped us grasp the theory but also supported us in conducting experiments and analyzing data. We would also like to extend our appreciation to Associate Professor Pham Son Minh, Mr.
Tran Minh The Uyen, Mr. Nguyen Van Thuc, Mr. Truong Thanh Cong, and Mr. Nguyen Van Mang for providing us with the essential materials and equipment for conducting the experiments.
Thanks to them, we can perform experiments accurately and reliably. Besides, we would like to sincerely thank the guidance, and dedicated help of the teachers during the implementation of the project. The input and contributions from the teachers have greatly helped us enhance the quality of our research. Once again, we would like to express our profound gratitude to the teachers of Ho Chi Minh City University of Technology and Education who have assisted us during this graduation project.
We hope that this project will yield positive results and provide valuable information to the metal production industry regarding the surface treatment process using plasma energy to achieve the optimal hardness and microstructure of C45 steel samples. 6 ABSTRACT EXPERIMENTAL SURFACE TREATMENT USING ARC WELDING - APPLICATION FOR FLAT PRODUCTS In recent years, the use of plasma energy for surface treatment of metals has become very important option in the manufacturing industry. This is because this method allows for significant improvement in the surface properties of metal products, including both durability and hardness. Among these properties, surface hardness and microstructure play a crucial role in ensuring the mechanical properties of the products.
This technique is one of the most advanced methods to enhance the mechanical properties of steel. The process of surface treatment using arc welding involves the interaction between light and the metal surface. Arc is emitted from a Arc source and melted the metal surface. The energy of the arc welding is absorbed by the steel surface, resulting in radiation and thermal emission, raising the surface temperature.
Subsequently, the metal surface is rapidly cooled through fast cooling methods to create the best crystal structure on the metal surface. When the hardness of C45 steel is increased using this method, the impacts on the metal surface are also significantly reduced. This is particularly important in increasing the lifespan and durability of metal products. However, to achieve optimal efficiency, the surface treatment process using plasma energy needs to be designed and adjusted with specific parameters, including current intensity, machine speed, and distance between the metal surface and the light source.
Optimizing these parameters is crucial to achieving the best mechanical properties of C45 steel after surface treatment using arc energy. 7 TABLE OF CONTENTS GRADUATION THESIS MISSIONS…………………………………………………….2 COMMENTS FORGRADUATION PROJECT………………………………………………3.Research Status in Vietnam.Research Status Overseas .Objectives of the topic.Research subjects and scope .Scientific and practical significance of the topic .Limitations of the Topic .1 Overview of TIG Welding .2 Classification of TIG Welding. Experiment of Surface Fusion Energy Welding - Flat Surface .1 Post-TIG Welding Processing of Products.2 Some Materials Used in TIG Welding .4 Shielded Gas Tungsten Arc Welding .1 Overview of Shielded Gas Tungsten Arc Welding .2 Characteristics of TIG Welding .3 Advantages and Disadvantages of TIG Welding. Welding Materials and Equipment .5 Metal Droplet Transfer Modes in TIG Welding.
39 UNDERSTANDING, RESEARCHING, AND FABRICATING WELDING SAMPLES .1 Selecting the Welding Material .2 Selecting the Size of the C45 Steel Sample .3 Surface Milling of C45 Steel Before Welding .4 Selecting the Necessary Data for the Taguchi Welding Process .5 Welding Sample Fabrication Process .1 Preparation of Tools and Equipment .2 Simulation of Welding Paths on CNC Machines .6 Key Processes to Ensure Beautiful Welds. 51 SAMPLE FABRICATION, MEASUREMENT METHODS, MEASUREMENT DATA, AND EXPERIMENTAL DATA PROCESSING. Double-sided milling and the purpose of double-sided milling operation. Flattening and aligning the surface.
Increasing the adhesion layer. Surface treatment using laser energy.1 Taguchi experimental data. Relationship between Hardness after Treatment and Elements using Taguchi Method. Graph of polynomial Regression Analysis: Vickers Pyramid Number (HV) versus distance from tungsten to the surface.
Graph of Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus gas volume.4 Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus velocity. Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus Ampe…. Measurement data of experimental samples by using univariate method. Relationship between Distance from the tungsten electrode to the metal surface and hardness.
Relationship between amperage and hardness. Relationship between amperage and hardness. Relationship between shielding gas and hardness.Hardness values, HV0. The distribution of microhardness in the thickness for steels sample 18.
The distribution of microhardness in the thickness for steels sample 6. Sample preparation and observation method:. The microstructure organization of C45 steel after quenching. 73 10 LIST OF TABLES Table 2.1: Some commonly used gases for TIG welding .2: The influence of gas mixtures on the stability of the arc and the formation of the weld bead shape .3: Electrode Identification Requirementsa,b .4: Chemical Composition Requirement for Electrodes .5: Tungsten Electrode and Shielding Gas .6: Effects of welding position .1: Measurement data of experimental samples by using Taguchi method .1: The chemical composition of C45 steel .2: Measurement data of experimental samples .1: Measurement data of experimental samples by using univariate method.
156 11 LIST OF FIGURES AND CHARTS Figure 2.1: Schematic diagram of TIG welding with argon shielding gas .2: Some details about WAAM .3: Gas Tungsten Arc Welding (GTAW) mechanism in an inert gas shielding environment .4: Schematic diagram of the TIG welding system .5: Comparison of two types of shielding gases .6 : V-I relationship with Ar and He shielding gases .8: Structure of a welding gun .9: Pressure regulator valve and gas cylinder .11: Beam shifting and shape shifting .13: Influence of welding speed on weld joint .14: The welding positions: Fillet welding - Vertical - Push welding .3: Surface of C45 steel after processing .5: Tig weld machine and Argon gas .1: Setting up a plan for the quenching process…………………………….1: Relationship between Hardness after Treatment and Elements using Taguchi Method.2: Response Table for Signal to Noise Ratios .3: Graph of polynomial Regression Analysis: Vickers Pyramid Number (HV) versus distance from tungsten to the surface .4: Graph of Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus gas volume.5: Graph of Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus velocity.6: Graph of Polynomial Regression Analysis: Vickers Pyramid Number (HV) versus Ampe.7: Relationship between Z and hardness .8: Relationship between amperage and hardness .9: Relationship between velocity and hardness .10: Relationship between velocity and hardness .11: Relationship between shielding gas and hardness .12: The distribution of microhardness in the thickness for steels sample 18 .13: The distribution of microhardness in the thickness for steels sample 6 .14: MP-2B Grinder Polisher .16: The microstructure organization of C45 steel after quenching. Problem Statement C45 steel is one of the popular types of industrial steel widely used in the production of mechanical products, especially in applications requiring high hardness and strength. However, surface treatment is crucial to achieving optimal hardness and microstructure for C45 steel products. Currently, C45 steel surface treatment processes such as heating, tempering, and polishing have been utilized for numerous years.
However, these methods do not achieve the optimal hardness and microstructure for C45 steel products. With the development of technology, quenching energy has become an advanced method for surface treatment of C45 steel. Quenching energy is the process of using ultraviolet or laser beams to generate heat and treat the surface of C45 steel. However, the process of surface treatment of C45 steel with quenching energy still faces many challenges.
These challenges include difficulties in optimizing the process and ensuring the accuracy and high durability of the products. Therefore, in the topic "Experimental Surface Tempering Treatment Using Energy from Arc Welding - Application for Flat Products." we will focus on optimizing the surface treatment process of C45 steel with quenching energy. We will study the factors that affect the processing process and propose optimal methods to achieve the optimal hardness and microstructure for C45 steel products. The results of this research will help improve product quality and contribute to the development of the mechanical industry.