MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION GRADUATION THESIS MAJOR: MECHANICAL ENGINEERING TECHNOLOGY RESEARCH ON THE EFFECTS OF MIG WELDING PARAMETERS ON WELD QUALITY OF C20 STEEL AND SUS201 STAINLESS STEEL INSTRUCTOR: NGUYEN THANH TAN STUDENT: NGUYEN TRAN TRUNG KIEN NGUYEN THANH LICH NGUYEN VAN HIEN Ho Chi Minh city, July 2024 MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY OF MECHANICAL ENGINEERING BACHELOR THESIS RESEARCH ON THE EFFECTS OF MIG WELDING PARAMETERS ON WELD QUALITY OF C20 STEEL AND SUS201 STAINLESS STEEL SUPERVISOR : ME. NGUYEN THANH TAN STUDENT’S NAME STUDENT’S ID NUMBER NGUYEN TRAN TRUNG KIEN : 20144114 NGUYEN THANH LICH : 20144414 NGUYEN VAN HIEN : 20144387 CLASS : 201441C COURSE : 2020 – 2024 Ho Chi Minh City, July 2024 MINISTRY OF EDUCATION AND TRAINING HO CHI MINH CITY UNIVERSITY OF TECHNOLOGY AND EDUCATION FACULTY OF MECHANICAL ENGINEERING BACHELOR THESIS RESEARCH ON THE EFFECTS OF MIG WELDING PARAMETERS ON WELD QUALITY OF C20 STEEL AND SUS201 STAINLESS STEEL SUPERVISOR : ME. NGUYEN THANH TAN STUDENT’S NAME STUDENT’S ID NUMBER NGUYEN TRAN TRUNG KIEN : 20144114 NGUYEN THANH LICH : 20144414 NGUYEN VAN HIEN : 20144387 CLASS : 201441C COURSE : 2020 – 2024 Ho Chi Minh City, July 2024 HO CHI MINH CITY UNIVERSITY OF THE SOCIALIST TECHNOLOGY AND EDUCATION REPUBLIC OF VIETNAM FACULTY OF MECHANICAL ENGINEERING Independence – Freedom – Happiness GRADUATION PROJECT ASSIGNMENT Semester II / School year 2023 – 2024 Supervisor: ME. NGUYEN THANH TAN Student’s name: 1.
Nguyen Tran Trung Kien ID Number: 20144114. Nguyen Thanh Lich ID Number: 20144414. Nguyen Van Hien ID Number: 20144387. Project code: CKM-78 Project title: Research on The Effects of MIG Welding Parameters on Weld Quality of C20 Steel and SUS201 Stainless Steel 2.
Initial materials provided by the advisor: - Recent studies related to the topic. - Documents on welding techniques, materials science,. - MIG welding robot G2. - PROFI PRESS hydraulic press.
- Universal Testing Machine – WE-1000B. - Micro polishing machine. - Materials: C20 steel, SUS201. Content of the project: - Understand the theoretical basis, analyze and evaluate previous research works.
- Experiment with influencing parameters. - Process the data. Final product: - Explanation report i - Optimal parameter set 5. Project sending date: 15/01/2024 6.
Project submission date: 06/07/2024 6. Presentation language: The report: English Vietnamese Present thesis: English Vietnamese CHAIR OF THE PROGRAM SUPERVISOR (Sign with full name) (Sign with full name) Permit defense …………………………………………… (Supervisor sign with full name) ii COMMITMENT Project title: Research on The Effects of Mig Welding Mode on Weld Quality of C20 Steel and Sus201 Stainless Steel Supervisor: ME. NGUYEN THANH TAN Student’s name : Nguyen Tran Trung Kien ID Number: 20144114 Student’s name : Nguyen Thanh Lich ID Number: 20144414 Student’s name: Nguyen Van Hien ID Number: 20144387 Class: 201441C Project submission date: Commitment : “We hereby declare that this thesis was carried out by ourselves under the guidance and supervision of ME. Nguyen Thanh Tan; and that the work contained and the results in it are true by authors and have not violated research ethics.
The data and figures presented in this thesis are for analysis, comments, and evaluations from various resources by our own work and have been duly acknowledged in the reference part. In addition, other comments, reviews and data used by other authors, and organizations have been acknowledged, and explicitly cited. We will take full responsibility for any fraud detected in my thesis.” AUTHOR 1 AUTHOR 2 AUTHOR 3 (Sign with full name) (Sign with full name) (Sign with full name) iii ACKNOWLEDGMENT A bachelor’s thesis is the most important achievement for all students. We don't know what to say other than express our deepest gratitude to the teachers who have always accompanied and supported us throughout the project.
First of all, we would like to extend our sincere thanks to ME. Nguyen Thanh Tan – our main instructor this time, who wholeheartedly instructed, guided us throughout the project process. We would also like to thank sincerely ME. Nguyen Thanh Tan, Ph.D Nguyen Van Thuc and ME.
Hoang Van Huong, who together supported and taught us about the knowledge of books, newspapers, and equipment in the school to help us gain a solid theoretical basis and how to operate the machine effectively. Besides, we are also thankful to my friends and teachers at Ho Chi Minh City University of Technical Education for always caring, helping, and encouraging us throughout the learning process so that we have the basic knowledge to prepare for the project. Finally, we would be remiss in not mentioning our families who silently stand behind us, cheering, caring, and helping us throughout the study process and completing our bachelor thesis. With our limited conditions, time and experience, this project cannot avoid mistakes and shortcomings.
We look forward to receiving guidance and comments from the teachers so that we can supplement and raise our awareness and better serve our practical work in the future. iv ABSTRACT The topic “Research on The Effects of MIG Welding Parameters on Weld Quality of C20 Steel and SUS201 Stainless Steel”.In this study, the main objective is to investigate the impact of welding parameters when performing MIG welding on C20 steel and SUS201 stainless steel. The goal is to determine the optimal parameters to enhance the tensile strength, flexural strength, and elongation of the welds using GM70S filler materials. The first chapter introduces the study, its motivation, and structure.
Chapter 2 reviews related research, highlighting gaps this study aims to address. Chapter 3 covers MIG welding theory, experimental setup, and quality tests, detailing processing conditions and their effects. Chapters 4 and 5 discuss experimental preparation, execution, and results. Chapter 6 explores future research directions.
The thesis comprehensively presents the theoretical foundation of the MIG welding method using GM70S, C20 steel, and SUS201 stainless steel workpieces, welding conditions, and input parameters. The parameters were optimized using the Taguchi method and ANOVA. For the experimental part, the study examines four main input parameters: welding current (I), welding voltage (U), electrode extension (d), and welding speed (v). By applying the Taguchi method and ANOVA, the research team obtained the following optimal parameter sets: - Optimal parameters for improving tensile strength - Optimal parameters for improving yield strength - Optimal parameters for improving elongation - Optimal parameters for improving modulus of elasticity - Optimal parameters for improving flexural strength.
All experiments in the thesis were conducted directly at the mechanical workshop and the micro-lab of the Ho Chi Minh City University of Technology and Education. The project received support in terms of machinery, experimental equipment, and funding from ME. Nguyen Thanh Tan, Ph.D Nguyen Van Thuc, and ME. Hoang Van Huong.
Student group Nguyen Tran Trung Kien Nguyen Thanh Lich Nguyen Van Hien v TABLE OF CONTENTS GRADUATION PROJECT ASSIGNMENT. v LIST OF TABLES .ix LIST OF FIGURES .xi LIST OF ABBREVIATIONS. Urgency of the study. Scientific and practical significance of the study.
Scientific significance of the study. Practical significance of the study. Aims of the study. Object and range of the study.
Object of the study. Range of the study. Specific research methods. Structure of the study.
Introduction to alloy steel material C20. Characteristics of C20 alloy steel. Composition of C20 steel. Applications of C20 alloy steel.
Distinguishing C20 steel from other types of steel. Introduction to stainless steel material SUS201. Stainless steel SUS201. Characteristics of stainless steel SUS201.
Composition of stainless steel SUS201. Applications of stainless steel SUS201. Distinguishing stainless steel SUS201 from other steel types. MIG welding technology.
Overview of MIG welding technology in mechanical engineering. Principles of MIG welding process. The welding arc. Advantages, limitations, and applications of MIG welding technology.
Experimental methods and planning. Signal-to-noise ratio. Analysis of variance. Methods of checking and evaluating welding quality.
Research on structural components of welded joints. Method for determining the durability of the weld bond with materials. Mig welding robot. Hydraulic press machine – PROFI PRESS.
Universal testing machine. Prepare test sample and welding process. Select welding parameters for MIG welding robots. Statistical analysis using the taguchi method to optimize process parameters.
RESULTS AND DISCUSSION. Effects of welding parameters on weld quality. Effects of welding parameters on weld quality by tensile test. Effects of welding parameters on weld quality by bending test.
Microstructure of the weld. Experiment validation compared to prediction, base metal, and optimal results. Summary of the MIG welding process. CONCLUSION AND DEVELOPMENT DIRECTIONS.
Future Development of the Research. PENETRATION DEPTH OF THE WELD. MICROSTRUCTURE OF THE WELD. WELD STRENGTH GRAPH.
89 viii LIST OF TABLES Table 2.1: Composition of C20 Steel according to JIS G4051 Standard .2: Application of Shielding Gas to Weld Metal.3: Welding wire size with corresponding current.4: Taguchi Experimental Plan for Array L9 (33).1: Chemical Composition and Mechanical Components of SUS 201 Stainless Steel according to ASTM 240/240M Standard.2: Chemical Composition and Mechanical Components of C20 Steel according to JIS G4051.3: Fixed MIG welding parameters with GM70S filler materials.4: MIG Welding Parameters Performed with GM70S filler materials.5: Taguchi Experimental Plan for Array L16 with GM70S filler material.1: Table L16 of Taguchi and tensile test results.2: Response table for S/N ratios (dB) .3: Analysis of variance for tensile strength .4: Table of optimal tensile strength parameters .5: Response table for S/N ratios (dB) .6: Analysis of variance for yield strength .7: Table of optimal yield strength parameters .8: Response table for S/N ratios (dB) .9: Analysis of variance for elongation.10: Table of optimal elongation parameters .11: Response table for S/N ratios (dB) .12: Analysis of variance for elastic modulus.13: Table of optimal elastic modulus parameters .14: Table L16 of Taguchi and bending test results .15: Response table for S/N ratios (dB) .16: Analysis of variance for Flexural strength .17: Table of optimal flexural strength parameters .18: Response table for S/N ratios (dB) .19: Analysis of variance for elastic modulus .20: Table of optimal elastic modulus parameters.21: Comparison table of optimal parameters and experimental parameters results.22: Tensile Test Results of Base Metal .23: Rules of the Studied Parameters. 73 x LIST OF FIGURES Figure 2.1: Some Examples of Applications of C20 Steel.2: Some Examples of Applications of SUS201.3: MIG Welding System.4: The principle of MIG welding.5: The voltage distribution in the arc.6: Relationship between wire speed and welding current.7: Stick-out outside the welding torch.8: Test Samples Include the Unprocessed Part of the Product.9: Dog-bone Sample Parameters according to ASTM E8/E8M Standards .10: Stress-Strain Curves For Mild Steel and Low And High Alloy Steel.2: Flowchart of The Experimental Work.3: PANASONIC TA-1400G2 MIG Welding Robot.4: MIG Welding process by G2 Welding Robot.5: Hydraulic Press Machine – PPCM 50.6: Stamping die for specimen testing.7: Universal Testing Machine – WE-1000B.8: Tensile - Bending test using WE-1000B tensile machine .9: Model of MIG Welding Jig for Robots.10: Jigs for Automatic Welding Robots.11: Laser Cutting Profile of Welded Workpiece.12: The Welding Sample Has Been Prepared.13: Joint square preparation for butt welds, welded from one side.14: Fix The Welding Workpiece on The Jig.15: Profile for Tensile Test Specimen According to ASTM E8 Standard.16: Profile for Bending Test Specimen According to ISO 15614-1 Standard.17: Experimental and Sample Processing Procedure .1: Average graph of output results during tensile testing.2: Main effects plot for ratios .3: The penetration depth of the sample was measured using ImageJ software .4: Penetration depends on the microstructure of the weld.5: Main effects plot for ratios .6: Main effects plot for ratios .7: Main effects plot for ratios .8: Average graph of output results during bending testing .9: Main effects plot for ratios .10: Main effects plot for ratios .