Investing in quality : identifying the true value of advanced weld inspection technology

The quality of Caterpillar's welds is becoming increasingly important as their equipment is made leaner with the goals of increased performance, lighter weight and lower unit cost. Due to the inherently variable nature of arc welding, non-destructive weld evaluation is critical to ensure that welding processes remain in control, and that defective parts are quarantined and repaired before being released downstream. The "conventional" ultrasonic weld inspection technology in use at present has several limitations: -- Areas within common joint configurations cannot be adequately inspected due to geometry constraints; -- Discontinuity evaluation requires subjective real-time human interpretation by highly trained operators; -- The data produced by the instrumentation is unconducive to recording for off-line analysis; -- Imprecise defect sizing leads to Type I and Type II inspection errors - the unnecessary rework of good parts, and the inappropriate release of non-complying parts. This project addressed these limitations of conventional ultrasonic weld inspection by identifying and evaluating alternative commercially available technologies and by initiating the internal development of specific proprietary technologies tailored to Caterpillar's needs. Through collaboration with Caterpillar's non-destructive evaluation (NDE) community, as well as outside vendors, a technology known as "phased array" was selected and validated in the laboratory and production environments. Although phased array was not new to Caterpillar, its adoption within the production facilities had previously been limited.

Department dc:contributor.department

Leaders for Global Operations Program at MIT

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2016

Author dc:creator

• Buelsing, Michael T

Advisor dc:contributor.advisor

• Roy Welsch and Thomas Eagar.

• Sloan School of Management.
• Mechanical Engineering.
• Leaders for Global Operations Program.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/104312

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/104312