Honors College Theses

Publication Date

2024

Major

Mechanical Engineering (B.S.)

Document Type and Release Option

Thesis (open access)

Faculty Mentor

Hossein Taheri

Abstract

Welding is one of the major and most commonly used methods of material joining in industries around the world. The mechanisms of welding include complicated processes which can cause significant alteration in final properties and quality of the weld compared to the base materials. Due to these physical and chemical processes during the welding processes, defects and flaws can be generated. Observing such flaws over the years, leads engineers and researchers to investigate the methodologies to identify the cause and effect of defects and their effect on the quality of the welds. A better understanding of such parameters helps to identify appropriate and cost-effective predictive and preventive maintenance plans. In this project, flaw generation mechanisms will be investigated through welding samples which are fabricated at various welding speeds. The effect of varying speeds on the final quality of the parts will be determined using Phased Array Ultrasonic Testing (PAUT). After analyzing the results it was determined that PAUT was a viable method for detecting differences in how weld speed affects quality of the weld. The main difference detected by the nondestructive testing between the faster and slower speeds was the size of the heat affected zone. There was no sizable increase in the number of defects or the magnitude of defects when comparing the wide range of speeds used in the project.

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