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Introduction of high-quality welds in production: Benefits and challenges
University West, Department of Engineering Science, Division of Welding Technology.
2018 (English)Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesisAlternative title
Introducera högkvalitativ svets i produktion (Swedish)
Abstract [en]

The main objective of this work is to evaluate the different post weld improvement methods like burr grinding, TIG treatment and HFMI from a production standpoint (repeatability, productivity, and cost) and determine the best suitable method for production scenario. The work summarizes the benefits and challenges with different post weld improvement method and provides the guideline/recommendation to follow for each method. Process variation is known to be one of the major concerns in accurately predicting the fatigue life of the welded structures. In order to reduce the process variation, a study has been conducted to determine the key parameters (like toe radius, flank angle and undercut) that have more significant influence on the fatigue life. The study helps to understand the right amount of effort required to generate the optimum output so that non-value added work could be potentially avoided. This will result in faster processing time which in turn increases the productivity. In this thesis work, the fatigue properties are evaluated at a load level (R=-1), which is similar to the actual load level for construction equipment. Most of the samples are tested at the same stress level to know the benefits in using a high strength material along with the improvement technique. The fatigue load cycle includes an initial peak load to understand the relaxation of beneficial compressive residual stresses when subjected to actual service loads, particularly in HFMI method. In such relaxation scenario, the geometry benefits become more significant and an improved geometry profile for HFMI treatment is also discussed. The thesis result shows Burr Grinding method is much preferred from production standpoint and it has a life improvement of about 3x to 8x times as compared to design life goals. Further work is needed to determine the effectiveness of the method in removing defects and the possibility to take the benefits of crack initiation life. Also, more testing is needed at different stress levels to determine the slope of the proposed method which may help to further optimize the design demands.

Place, publisher, year, edition, pages
2018. , p. 52
Keywords [en]
High-quality welds, Post weld improvement methods, Production of fa-tigue improved welded joints, Fatigue of welded steel structures
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:hv:diva-12936Local ID: EXP800OAI: oai:DiVA.org:hv-12936DiVA, id: diva2:1250854
Subject / course
Mechanical engineering
Educational program
Produktionsteknik
Supervisors
Examiners
Available from: 2018-10-02 Created: 2018-09-25 Last updated: 2018-10-02Bibliographically approved

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