Sources of weld strength variability in capacitor discharge welding Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/00000288j

Descriptions

Attribute NameValues
Creator
Abstract or Summary
  • Capacitor discharge welding (CDW) is a rapid solidification joining process under the influence of one-dimensional thermal gradients. Although CDW is useful for joining small parts and dissimilar metals, CD welded joints have a large variability in weld strength. CDW is not widely accepted because of a lack of automated process control. Studying the sources of variability in the CDW process can guide the automation of CDW. Therefore, the objectives of this study were to investigate sources of variability that affect weld strength and to generate a model to predict the weld strength variability in CDW. The source of variability was investigated by using screening experiments. Four different materials, stainless steel, Nitronic 50 Steel, copper, and low oxygen copper (C101), were selected to represent various levels of thermal conductivity and absorbed gas content. Thermal conductivity, percentage of gas content absorbed, diameter, and welding time were treated as the independent variables while the dependent variables were the standard deviation of CD weld strength as a percentage of base material strength and the mean of CD weld strength as a percentage of base material strength. A screening experiment and a statistical analysis of the data were used to develop a predictive model of the weld strength variability in CDW. Electron photomicrographs of weld fracture surfaces and dynamic current and resistance curves for each welding cycle were used to support conclusions from the statistical analysis. Conclusions of this study are that thermal conductivity and absorbed gas content do have a significant influence on weld strength variability in CDW.
Resource Type
Date Available
Date Copyright
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Rights Statement
Peer Reviewed
Language
Digitization Specifications
  • File scanned at 300 ppi (Monochrome, 256 Grayscale) using Capture Perfect 3.0 on a Canon DR-9050C in PDF format. CVista PdfCompressor 4.0 was used for pdf compression and textual OCR.
Replaces
Additional Information
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-17T18:15:48Z (GMT) No. of bitstreams: 1 BenjarattananonJukchai1999.pdf: 4959879 bytes, checksum: 403a095b498d882df6f1e3d691baf105 (MD5)
  • description.provenance : Made available in DSpace on 2012-09-17T18:17:46Z (GMT). No. of bitstreams: 1 BenjarattananonJukchai1999.pdf: 4959879 bytes, checksum: 403a095b498d882df6f1e3d691baf105 (MD5) Previous issue date: 1998-08-05
  • description.provenance : Submitted by Kirsten Clark (kcscannerosu@gmail.com) on 2012-09-14T23:52:54Z No. of bitstreams: 1 BenjarattananonJukchai1999.pdf: 4959879 bytes, checksum: 403a095b498d882df6f1e3d691baf105 (MD5)
  • description.provenance : Approved for entry into archive by Patricia Black(patricia.black@oregonstate.edu) on 2012-09-17T18:17:46Z (GMT) No. of bitstreams: 1 BenjarattananonJukchai1999.pdf: 4959879 bytes, checksum: 403a095b498d882df6f1e3d691baf105 (MD5)

Relationships

In Administrative Set:
Last modified: 08/15/2017

Downloadable Content

Download PDF
Citations:

EndNote | Zotero | Mendeley

Items