INFLUENCE OF TIG PROCESS PARAMETERS ON HARDNESS, TENSILE STRENGTH AND MICROSTRUCTURES OF AISI430 FERRITIC STAINLESS STEEL WELDS
- Project Research
- 1-5 Chapters
- Abstract : Available
- Table of Content: Available
- Reference Style: APA
- Recommended for : Student Researchers
- NGN 3000
ABSTRACT
The influence of tungsten inert gas (TIG) welding process parameters on the microstructural features and mechanical properties (hardness and tensile strength) of AISI430 ferritic stainless steel (FSS) weldsbased on the central composite design (CCD) approach, was investigated. The process parameters considered in this study include; the welding current (I), welding speed (S) and argon flow rate (AFR). The stainless steel AISI 430 FSS plates having chromium content of 17% Cr and 1.5mm thickness were butt-welded using autogenous tungsten inert gas welding process. The microstructures of the FSS welds were analyzed using optical microscope.The hardness and tensile strength were determined using Vickers’s microhardness testing machine and Hounsfield tensile testing machine respectively. The results showed that all input variables considered have direct influence on the properties as well as the microstructure of the weldments. Microstructural result reveals ferrite structures aligned in the cold rolling direction for the base metal. The microstructure of the weld metal at the optimized conditionshows the presence of equiaxed ferrite grains with some grain boundary martensitestructureswithin the fusion and heat affected zones of theweldment. It was observed that welding current shows the greatest effect on the tensile strengthwith34% contribution, followed by the speed and argon flow rate with 15% and 2.54% respectively. For the hardness, the speed plays the major role. Empirical models were generated from the analysis to predict the weld quality. An optimized tensile strength and hardness of 431.014MPa and 307.10 HV respectively, were predicted at the welding current of 22A, the welding speed of 5mm/s and the argon flow rate of 10L/min. In order to validate the results, confirmatory experiments were performed based at the optimized condition and the test results were found to be in good agreement with the predicted values with percentage errors of 1.23% and 1.81% for the tensile strength and hardness respectively. Based on this finding, it can be concluded that the optimization of TIG input parameters usingresponse surface vi methodologyapproach produced weld joint with good tensile strength and improved hardness that is very close to that of the base metal.
Related Project Materials
PREDICTING STUDENTS ACADEMIC PERFORMANCE USING ARTIFICIAL NEURAL NETWORK
BACKGROUND TO THE STUDY
Predicting student academic performance has long been an important research topic. Among the iss...
INTEGRATION OF PASSIVE COOLING DESIGN STRATEGIESINSHOPPING MALLS, ZARIA, KADUNA STATE
ABSTRACT
Globally, shopping malls trends have been changing from open precinct tolargershopping malls. This transition is heading towards...
THE RELATIONSHIP BETWEEN EFFECTIVE CLAIMS MANAGEMENT AND THE GROWTH OF NIGERIAN INSURANCE INDUSTRY
EXCERPT FROM THE STUDY
The existence of insurance markets facilitates economic ...
ANTIBIOTICS SUSCEPTIBILITY AND MOLECULAR CHARACTERIZATION OF CLINICAL ISOLATES OF E. coli FROM UNIVERSITY TEACHING HOSPITAL IN NIGERIA
ABSTRACT
Antimicrobial drug resistance is a global challenge with the emergence of resistant bacterial strains worldwide. This study was...
THE IMPACT OF GOVERNMENT EXPENDITURE ON ECONOMIC GROWTH IN NIGERIA (1980-2010)
BACKGROUND OF THE STUDY.
Government expenditure has served as a common means of using fiscal policy in many countries to achieve economic...
AN ASSESSMENT OF THE STRATEGIES FOR PROMOTING INTERDISCIPLINARY COLLABORATION IN TECHNICAL EDUCATION
ABSTRACT: Strategies for Promoting Interdisciplinary Collaboration in Technical Education are vital for fostering innovation and holistic prob...
EFFECTIVENESS OF LASTMA ON TRAFFIC MANAGEMENT
-
-
Background to the Study
-
Traffic management is the practice...
THE ROLE OF ACCOUNTING IN REAL ESTATE INVESTMENT FUNDS (REITs)
Abstract: THE ROLE OF ACCOUNTING IN REAL ESTATE INVESTMENT FUNDS (REITs)
This study aims to: (1) evaluate the unique accounting requireme...
ASSESSMENT OF SUBSTANCE ABUSE, PEER PRESSURE, AND IMPULSIVITY AS PREDICTORS OF MENTAL HEALTH PROBLEMS AMONG UNDERGRADUATE STUDENTS
EXCERPT FROM THE STUDY
- Peer pressure can cause decrease in self confidence thereby leading to heath problem
- Peer press...
Read more
THE EFFECT OF DIVORCE ON CHILD EDUCATION
Statement of Problem
Th...
Read more
